Abstract
This chapter describes observed historical and projected future impacts of climate change on the coastal and terrestrial ecosystems of the Baltic Sea basin. Because terrestrial and aquatic ecosystems interact, this chapter gives particular emphasis to the coastal zone as a contact area for terrestrial, marine and atmospheric processes. Archipelagos and post-glacial land uplift are particular features of the Baltic Sea basin and so receive special consideration. This chapter comprises three main sections. The first describes coastal zone and archipelago ecosystems in the Baltic Sea region and evaluates the potential impacts of climate change. The second examines a case study for the effect of current and future climate change on coastal bird populations and communities. The third evaluates the effects of current and future climate change on forests and natural plant communities in the Baltic Sea basin and the ways in which terrestrial ecosystems may interact with aquatic ecosystems. Climate-related changes in carbon storage are also discussed.
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1 Introduction
This chapter describes observed historical and projected future impacts of climate change on the coastal and terrestrial ecosystems of the Baltic Sea basin. This region contains many types of ecosystem , such as boreal and hemiboreal forests, peatlands , arable and other human modified lands, freshwater and riparian ecosystems and diverse coastal environments. Terrestrial and aquatic ecosystems interact and so this chapter focuses particularly on the coastal zone as a contact area for terrestrial, marine and atmospheric processes. Archipelagos are a particular feature of the Baltic Sea basin and so receive special emphasis. Thus, the focus of this chapter is on ecosystems that received little or no attention in previous assessment of climate change in the Baltic Sea basin (BACC Author Team 2008).
A special feature of the Baltic Sea region is land uplift . Currently, the rate of land uplift in the Baltic Sea region is −1 to 9 mm year−1 (Leppäranta and Myrberg 2009; see also Chap. 9, Sect. 9.2). Although marine regression has been the prevailing process on the coasts, periods of marine transgression (shoreline advance) have also occurred (Björck 1995). Thus, the transitional zone between the terrestrial and marine realms is considered particularly changeable, which highlights the necessity to address the aquatic dynamics of the Baltic Sea within the contexts of sea-level rise (Chaps. 9 and 14) and drainage basin processes. It is important to emphasise the combined effect of climate change impacts and post-glacial land uplift on coastal ecosystems , especially in the northern parts of the Baltic Sea basin.
The sensitivity to human-induced change is particularly evident in terms of the water volume of the Baltic Sea. Water volume divided by the number of inhabitants in the drainage basin equates to about 250,000 m3 per capita. This is only 0.13 % of the value calculated for the World Ocean and the total world population (186,000,000 m3 per capita). A strong human influence in the Baltic Sea catchment area also results from the high population pressure (80–90 million inhabitants) and because around 20 % of the overall land area is arable land concentrated towards the south (Sweitzer et al. 1996). Thus, the marine ecosystem is under considerable pressure from the land: both in abiotic terms (such as temperature change and pollutant inputs) and biotic terms (such as from invasive species).
This chapter focuses on ecosystems and processes that are unique and vulnerable to environmental change, including climate change. Section 16.2 describes coastal zone and archipelago ecosystems in the Baltic Sea region and evaluates the potential impacts of climate change on the interaction between aquatic and terrestrial ecosystems . Section 16.3 examines the effect of current and future climate change on coastal birds and bird communities. Section 16.4 evaluates the effects of current and future climate change on forests, natural vegetation and carbon storage in the Baltic Sea basin.
2 The Coastal Zone and Shorelines
2.1 Heterogeneity Implies Regionally Different Effects
Coastal areas play key roles in the interaction between terrestrial and aquatic systems. The coastal zone comprises the marine areas under terrestrial influence, as well as the terrestrial environment under marine influence (Tolvanen and Kalliola 2008). The ecosystems of the coastal areas are unique in combining both realms. Human occupancy and its impacts are exceptionally diverse in the often densely populated coastal areas.
The total shoreline of the Baltic Sea measures 76,000 km (HELCOM 2012). The distribution of shorelines of different complexity (Bartley et al. 2001) shows remarkable variety, from soft-formed depositional shores to the complex fractal shorelines of the bedrock-dominated archipelagos . Shore density (length of shoreline per unit area) provides a good indicator of shoreline complexity, which is highly variable in the Baltic Sea region (Fig. 16.1).
Shore density is not the only parameter with significant regional variation on the Baltic Sea coasts: the amount of nearshore areas also varies, both on the littoral and terrestrial sides (Fig. 16.1). The importance of edge effects becomes apparent when high shore density areas are considered as ecosystem patches—the nearshore ecosystems prevail in high shore density areas compared to the less complex coastal settings in other areas. Biodiversity of plant and animal communities is generally highest on the edges of different habitats because edges share species from both habitats. In addition, areas with different land–water transitions may respond differently to anticipated change, for example climate-related sea-level rise.
In areas with a wide coastal zone, from the mainland to the outermost islets, the transition from the terrestrial to the marine environment is often gradual. A wide coastal area may show distinct inner, middle and outer zones, with characteristic physical dimensions and ecological responses (e.g. Häyrén 1900; Granö 1981; Jaatinen 1984; Granö and Roto 1989b). This transition may be particularly sensitive to environmental change in the interface between the terrestrial and marine systems.
Post-glacial land uplift progresses at different rates in different Baltic Sea coastal areas. While uplift is almost 1 cm year−1 in the Bothnian Bay , the southernmost coasts of the Baltic Sea undergo slight submergence (Eronen 2005; Myrberg et al. 2006; see also Chap. 9). Figure 16.2 shows the proportion of coastal areas in each uplift category. These differences are crucially important in relation to projections of global sea-level rise (see Chap. 14). It is noteworthy that land uplift is also a process that creates particular coastal environments, such as closing bays (flad to glo-lake continuum (see Tolvanen et al. 2004)), and these processes work at different rates in different parts of the Baltic Sea.
There is a wide variety of shore types on the Baltic Sea coasts: chalk cliffs, barrier islands with coastal lagoons, sandy beaches, flat clay shores, rocky shores and esker shores (see also Chap. 20). All these environments are subject to particular erosional and depositional processes, which are mediated by different shore-forming forces such as wave energy. These drivers, in turn, vary in response to changing weather conditions making them sensitive to climate change. Furthermore, the prevailing processes in the shore areas are also affected by the post-glacial land uplift of the Fennoscandian crust. There are several ways to classify coastal areas (e.g. Bird 2000; Fairbridge 2004; Finkl 2004) and the Baltic Sea coasts have been classified by several authors (Furman et al. 1998; Frisén et al. 2005; HELCOM 2012; see also Chap. 20). HELCOM (2012) presented six coastal types based on the structural appearance of the coast:
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Archipelagos—the mainland shoreline does not face the open sea
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Bodden coasts with lagoons—low elevation coasts with dynamic sediment balances
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Cliffs —erosional shores of soft sedimentary rocks
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Fjords and rocky shores—hard rock environments with glacial erosion patterns
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Intended low coasts—low elevation coasts with marshes and skerries
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Open low coast—often sandy dynamic coasts.
Shore openness defines the shore’s exposure to the open sea and so portrays the wave formation potential (Ekebom et al. 2003; Tolvanen and Suominen 2005; Murtojärvi et al. 2007). On coasts with low shore density , the shore openness is generally high, while on high shore density coasts, most of the shoreline is sheltered by surrounding islands.
Owing to its restricted connection to the World Ocean, the Baltic Sea is effectively non-tidal. There are, however, irregular water level fluctuations caused by changes in atmospheric pressure , precipitation , wind strength and standing wave oscillation (seiche) (Myrberg et al. 2006; Chap. 9). The combined effect of these factors may under some circumstances cause local sea-level fluctuations in large bays of up to 3.2 m in the northernmost part of the Bothnian Bay (Frisén et al. 2005). An increase in the magnitude and frequency of extreme weather events may increase the frequency of extreme water level events (i.e. surges) on the Baltic Sea coasts. During warmer than normal winters, storms can also cause local sea-level rise, which together with ice dams in rivers and seiche fluctuations may increase winter flooding of Baltic Sea shores.
The formation of sea ice influences Baltic Sea shores (see also Chap. 8). Ice usually forms first in shallow inland bays, extending gradually towards the open sea. Sea ice in contact with the shore can cause local erosion through tearing as well as deposition by ice push (e.g. Forbes and Taylor 1994). Annual sea ice dynamics vary from year to year depending on changes in winter temperature, storms and water level fluctuations and sometimes also on the weight of snow on ice (Chap. 8). These variations influence shore geomorphology, ecosystems and human livelihoods. If winters become warmer, it is likely that significant changes will occur in the ice conditions of the Baltic Sea (Omstedt and Nyberg 1997). As a consequence, sea ice interaction with the shores of the Baltic Sea may decrease in importance, and open water conditions with wave energy -induced dynamism may become more important (see also Chap. 20).
Human influences of terrestrial origin are diverse and induce various pressures on the coastal and marine systems. Eutrophication is especially sensitive to changes in atmospheric and hydrological processes, with consequent alterations in nutrient input and biological processes (HELCOM 2009). Maritime activities and shore protection also cause physical stress, which is particularly relevant for shallow coasts and archipelagos (e.g. Eriksson et al. 2004).
Land use varies greatly within the Baltic Sea basin (see also Chaps. 21 and 25). The most notable contrast is between the agricultural south and the forested north (Sweitzer et al. 1996). When only the immediate vicinity of the shoreline is considered, the north–south contrast is less striking (Fig. 16.3). The land-use patterns within 1 km of the shoreline reflect the high human occupancy of the coastal areas: urban areas are frequent, especially in the Scandinavian countries and Finland, where shoreline development and private land ownership on shores has been allowed to a greater degree than in the Baltic States and Poland.
2.2 Impacts of Climate Change on Coastal Areas
The Baltic Sea coasts show a large variety of environments on which climate change may have strong effects (Kont et al. 1997, 2003; Neumann and Friedland 2011; Störmer 2011) (Table 16.1). Some of the ecosystem responses are particular to the relatively simple-structured brackish water ecosystems of the Baltic Sea. Therefore, a comprehensive view of the regional geography and distribution of the different habitats within the drainage area is important when assessing the pattern of future change.
2.3 The SW-Finnish Archipelago as an Example of a Particularly Sensitive Coastal Environment
The presence of extensive archipelago coasts is a particular feature of the Baltic Sea. In these areas, the interaction between the terrestrial and marine realms can be particularly complex. The Fennoscandian ice sheet of the Pleistocene glaciation retreated from SW Finland about 10,500 cal. year BP (Frisén et al. 2005; see also Chap. 2). The region is now characterised by a fragmented bedrock surface of the Fennoscandian Shield, with local relative elevations up to 100 m. As the bedrock base surface is slightly tilted to the west and is partially submerged, the result is an archipelago coast with an east–west transition from a land-dominated inner archipelago to a water-dominated skerry landscape at the edge of the open sea (Fig. 16.4). The width of this transition zone is up to 150 km of continuous archipelago area. On a 1:10,000 map, the SW-Finnish archipelago alone, excluding the Åland Islands, contains more than 56,000 islands. About 8500 of these are larger than 1 ha (Stock et al. 2010). Water depth is generally less than 20 m, but exceeds 100 m in areas of bedrock faults. The archipelago has about 15,000 km of shoreline within an area of roughly 10,000 km2, giving an average shore density of 1.5 (Granö et al. 1999), ranging locally from 0 to 12.5 (Tolvanen and Suominen 2004).
The bedrock base is partially covered by till or fluvioglacial deposits and occasionally by marine sediments since the area was initially submerged after the deglaciation . Shore processes have affected these sediments , leaving the highest bedrock areas bare and accumulating sediments on the slopes and in nearby sea basins (Granö and Roto 1986). The current glacio-isostatic land uplift rate of 3–5 mm year−1 on the SW-Finnish coast (Suutarinen 1983; Kakkuri 1987; Vestøl 2006) has created a mosaic of bare bedrock and sedimentary surfaces along the shores, which are subject to primary succession.
The exceptionally high shore density is a result of abundant small-scale geomorphological details and gives rise to some special shore forms characteristic of the land uplift environment and habitats (Schwartz et al. 1989; Munsterhjelm 1997; Tolvanen et al. 2004). These land uplift habitats harbour specialised fauna and flora important for biodiversity (Vartiainen 1988). The physical conditions on the islands and shores are diverse and can differ notably between adjacent islands of similar size. The small-scale mosaic of islands and shallow water areas, with numerous small habitat patches, creates habitat edges and thus increases the biodiversity of the region (von Numers 1995; Boström et al. 2006). Shallow semi-enclosed bays often indicate intermediate characteristics between terrestrial and marine systems.
Salinity in the SW-Finnish archipelago ranges from 3.5 to 7.0 (Viitasalo et al. 1990). Annual ice cover can last for up to 100 days (Seinä and Peltola 1991), but ice duration is shortening (Haapala and Leppäranta 1997). Water temperature in the surface mixed layer reaches 20–25 °C in August. December is the windiest month with an average wind speed of 8.3 m s−1, while May, June and July show the lowest average wind speed of 5.3 m s−1 (FMI 1991). The predominant wind directions during the ice-free season are southerly, south-westerly and westerly (Heino 1994).
Water currents in the SW-Finnish archipelago are typically slow (<15 cm s−1) (Virtaustutkimuksen neuvottelukunta 1979), but faster currents occur occasionally in narrow straits. Flow direction and intensity vary depending on atmospheric pressure and wind patterns. Islands and underwater thresholds create small local basins, in which freshwater run-off mixes with offshore water, resulting in a dynamic mosaic of sea water of different origins and properties.
There are four-dimensional geographical patterns and seasonal dynamics in the water properties of the SW-Finnish archipelago. Importantly, many of these spatial or temporal patterns differ for the different sea water properties (turbidity, salinity , acidity and temperature) (Suominen et al. 2010a). For example, salinity shows considerable spatial, seasonal and interannual variability (Suominen et al. 2010b), challenging the physiological limits of many species living at the edge of their salinity tolerance . Eutrophication resulting from terrestrial run-off is a common environmental problem in the region (Lundberg et al. 2005; HELCOM 2009).
Penetration of solar radiation into the surface waters is strongly influenced by many optical constituents of terrestrial origin, such as suspended sediment and dissolved organic material, as well as by in situ phytoplankton populations (Kirk 2011). The inner archipelago is relatively turbid throughout the year due to suspended sediment from rivers and shallow clay bottoms. In the middle and outer archipelago areas, chlorophyll and humic compounds tend to regulate the underwater light field (Erkkilä and Kalliola 2004; Suominen et al. 2010a). Periods of high run-off and precipitation increase the freshwater input and local turbidity near river mouths.
In the complex archipelago areas, shore openness and the consequent shore sensitivity to storm damage create a mosaic of open and sheltered areas with a gradual transition towards the pelagic environment (Fig. 16.5). In addition to the zonal characteristics of the entire archipelago coast (Häyrén 1900; Granö 1981; Tolvanen and Suominen 2004), the abundance of littoral areas vulnerable to shore disturbance processes results in a variety of local patterns and characteristics. Due to continuous land uplift , the duration of exposure to shore processes for a particular site has been 400–800 years (Pyökäri 1986; Granö and Roto 1989a).
3 Climate Change Effects on Coastal Birds and Seabirds
Since the 1970s, the effects of climate change on birds have been analysed in a rapidly increasing body of literature (for a review, see Møller et al. 2010). According to the Millennium Ecosystem Assessment, climate change is likely to become one of the most significant drivers of biodiversity loss by the end of this century (Millennium Ecosystem Assessment 2005).
This section reviews the effects of climate change on coastal birds and seabirds in the Baltic Sea. Equally important are climate change effects on the distribution of land birds in the catchment area, but these effects are still to be consistently analysed. Discussion of land birds is therefore limited to a few general references and the chapter focuses on coastal birds and seabirds that rely on the habitats provided by the coasts, archipelagos and open sea areas of the Baltic Sea.
3.1 Coastal Birds and Seabirds as Components of Baltic Sea Ecosystems
Seabirds and coastal birds are an integral part of coastal and marine ecosystems and link into ecosystems at a number of trophic levels (Tasker and Reid 1997), usually as predators near the tops of food chains. Thus, gulls, ducks and waders can play important roles in the mass and energy fluxes of food webs, as well as in food web control (Moreira 1997; Eybert et al. 2003). Seabird nutrient transport between marine and terrestrial realms may shape entire ecosystems (Croll et al. 2005).
As an addition to their role in ecosystems, birds provide ecosystem services that benefit humans (Şekercioğlu et al. 2004; Millennium Ecosystem Assessment 2005; Şekercioğlu 2006). In Sweden, Rönnbäck et al. (2007) identified more than forty categories of goods and services provided by coastal ecosystems, including several services connected to coastal birds and seabirds.
3.2 Climate Change Effects
Climate change may impact coastal birds and seabirds of the Baltic Sea area by affecting water salinity, temperature and acidity, air temperature during breeding and non-breeding seasons, as well as rainfall and windiness. These environmental factors can affect birds directly by causing adult or juvenile mortality or indirectly by altering, for instance, the abundance and quality of food. Climate change also affects physical habitats through sea-level rise, storm events and erosion. Furthermore, climate change may interact with other environmental processes, such as eutrophication. These effects may lead to changes in bird population sizes and distributions during breeding and non-breeding seasons and thus alter the composition of bird communities.
3.2.1 Salinity
In the Baltic Sea, changes in salinity can have a cascading effect on food webs through the whole pelagic ecosystem (Hänninen et al. 2003; Wasmund et al. 2011). Some climate change scenarios project a decrease in Baltic Sea salinity, while others project an increase (BACC Author Team 2008; Chap. 13). A fall in salinity would lead to a decrease in marine species and an increase in freshwater species (Möllmann et al. 2005; MacKenzie et al. 2007), while an increase in salinity would cause the reverse. Changes in salinity would probably affect coastal birds and seabirds indirectly, mainly through changes in food availability. For instance, distribution and size of the blue mussel Mytilus edulis are highly dependent on salinity (Westerbom et al. 2008), whereas the Baltic clam Macoma balthica has a greater capacity to acclimatise to highly dilute brackish conditions (Jansen et al. 2009). As it is mediated by food availability, the relationship between salinity and bird populations may not become apparent immediately (Rönkä et al. 2005).
3.2.2 Water Temperature
The marine ecosystem is sensitive to changes in water temperature, which can affect the plankton (Dahlgren et al. 2011; Wasmund et al. 2011) as well as fish reproduction and survival (Margonski et al. 2010), and may thus have an impact on the food resources of coastal birds and seabirds. The rise in surface water temperature in the Baltic Sea over the past 100 years (Belkin 2009) may have had significant ecological consequences (MacKenzie and Schiedeck 2007; see also Chaps. 18 and 19).
3.2.3 Eutrophication and Oxygen Deficiency
Climatic factors can promote eutrophication by enhancing nutrient inputs through increased run-off and precipitation (Hänninen and Vuorinen 2011). Both eutrophication and the rise in water temperature have caused a reduction in the oxygen content of the Baltic Sea water, which has in turn resulted in negative impacts on some prey items, such as different life stages of the eastern Baltic cod Gadus morhua (Hinrichsen et al. 2011). While some coastal birds might initially benefit from eutrophication, at some point the effects can turn negative (Rönkä et al. 2005).
3.2.4 Food Web Structure
Changes in food webs may have severe effects on coastal birds and seabirds at the top of the food chain. Climate change has been shown to affect the populations of oceanic seabirds by diminishing their food resources (Montevecchi and Myers 1997; Barbraud and Weimerskirch 2003). In addition to food abundance, the quality of food items may change (Riou et al. 2011). The low-energy value of fish was considered the cause of a major breeding failure of common guillemots Uria aalge in the North Sea (Wanless et al. 2005). Similarly, Österblom et al. (2001) found a long-term decline in the individual mass of common guillemot Uria aalge chicks when leaving a colony in the Baltic Sea that coincided with a decline in the condition of the sprat Sprattus sprattus. However, on the Norwegian coast, milder winters have been found to increase the availability of fish prey for the lesser black-backed gull Larus fuscus fuscus (Bustnes et al. 2010).
Climate change may also alter predation pressure on birds by facilitating invasions of mammalian predators. In the Baltic Sea area, non-indigenous mammalian predators that may prey on coastal birds and seabirds are mainly the American mink Mustela vison and the raccoon dog Nyctereutes procyonoides. The raccoon dog probably benefits from climate warming (Melis et al. 2010), which may allow it to increase and expand its distribution northwards (Helle and Kauhala 1991; Melis et al. 2010). However, evidence of the raccoon dog’s negative impacts on bird populations is still scarce (Kauhala and Kowalczyk 2011). The American mink in turn reduces the breeding densities of several birds nesting on small islands in the Finnish archipelago (Nordström et al. 2002, 2003), but there are few assessments of the possible effects of climate change on its abundance and distribution. In Iceland, climate change events may have contributed to a reduction in the mink population (Magnusdottir 2012) and an American study has shown its sensitivity to hydrological shifts resulting from climate change (Schooley et al. 2012).
3.2.5 Weather Conditions
Climate change may affect the breeding performance of seabirds by altering weather conditions during breeding or by affecting the condition of the birds after winter (Hildén 1964; Milne 1976; Lehikoinen et al. 2006). Weather, especially temperature, rainfall and wind, is important for the breeding success of common eider Somateria mollissima, velvet scoter Melanitta fusca, mute swan Cygnus olor and tufted duck Aythya fuligula (Koskimies 1955; Hildén 1964; Koskimies and Lahti 1964; Koskinen et al. 2003). If climate change increases the frequency of extreme weather events, there may be strong effects on reproductive success.
High temperatures during the breeding season may cause heat stress in adults, particularly in species that make long foraging trips, forcing the other parent to spend extensive periods in continuous nest attendance (Oswald et al. 2011). Climate change can also affect breeding success through complex predator–prey interactions, for instance by changing the availability of prey other than birds (Hario et al. 2009). However, even a severe crash in fledgling production need not affect the size of the future local breeding population (Rönkä et al. 2005).
Severe winters have been suggested to influence populations of the great crested grebe Podiceps cristatus (von Haartman 1945), mute swan (Koskinen et al. 2003; Rönkä et al. 2005), coot Fulica atra (von Haartman 1945, Rönkä et al. 2005), tufted duck (Hildén 1966, Hildén and Hario 1993), mallard Anas platyrhynchos, common eider and common goldeneye Bucephala clangula (Rönkä et al. 2005). Furthermore, high winter mortality has been assumed to be the main reason for the decline in razorbill Alca torda and greater scaup Aythya marila during the Second World War (Hildén and Hario 1993). The effects of cold winters can be additive, and it may take years for a species to recover (Rönkä et al. 2005). Winter severity may also affect the density-dependence of survival (Barbraud and Weimerskirch 2003).
3.2.6 Sea Ice
A climate-induced decrease in the ice coverage of the Baltic Sea would improve wintering conditions for Baltic Sea coastal birds and seabirds by alleviating competition for food. In addition, wintering birds would not congregate in areas of intense shipping. This would reduce their vulnerability to oil hazards, which are an important mortality factor for the long-tailed duck Clangula hyemalis (Hario et al. 2009). However, the net effect of climate change on the risk from oil pollution is unclear; while a decrease in ice cover might reduce the risk from oil pollution, an increase in windiness and extreme weather events might enhance it.
3.2.7 Migration
Many Baltic Sea coastal birds and seabirds migrate only as far as the western or southern Baltic Sea or the North Sea (Cramp and Simmons 1977; Pihl et al. 1995; Gilissen et al. 2002). A minor component of the Finnish and Swedish populations of some coastal birds remains in the northern Baltic Sea (Gilissen et al. 2002). Winter severity in the Baltic Sea reflects winter severity in the North Sea and further off the coast of western Europe, as well as in central Europe (Hurrell 1995). Winter severity in western Europe affects the non-breeding survival of several coastal birds and seabirds (Nilsson 1984; Koskinen et al. 2003). In addition to mortality from starvation and cold, severe winters may force birds to migrate further than normal and this incurs extra energy costs. Furthermore, when the Baltic Sea is largely ice-covered, seabirds are forced to feed in small open areas which increases competition for food and possibly the risk of disease (Grenquist 1965; Hario et al. 1995).
Climate change affects the arrival and departure times of migrants (Forchhammer et al. 2002; Jonzén et al. 2002; Hüppop and Hüppop 2003; Lehikoinen et al. 2004; Lehikoinen and Sparks 2010; Lehikoinen and Jaatinen 2011) and the timing of breeding (Forchhammer et al. 1998; Both and Visser 2001; Møller 2002; Sanz 2002). A mismatch between hatching time and resource availability has been observed in passerines (e.g. pied flycatcher Ficedula hypoleuca, Both et al. 2006) as well as in ducks (Oja and Pöysä 2007). Trophic mismatches may cause population declines particularly in long-distance migrants in seasonal habitats (Both et al. 2010). In addition to trophic constraints, long-distance migrants may suffer from increasing competitive pressure by residents and short-distance migrants along with climate change, contributing to population declines in long-distance migrants (Lemoine and Böhning-Gaese 2003).
Climate change may also drive changes in migratory routes, stopover sites and migratory tendencies within species and populations. For instance, delayed departure from breeding areas may be the cause of recently observed northward shifts in wintering ducks (Lehikoinen and Jaatinen 2011). Milder winters may allow birds to winter closer to breeding grounds and thus contribute to higher survival, which has been proposed for the mallard (Gunnarsson et al. 2012). However, temperature may be less important in shaping the wintering distributions of European dabbling ducks than factors such as feeding ecology (Dalby et al. 2013).
Species ranges are expected to move poleward with climate change (Thomas and Lennon 1999; Hickling et al. 2006), and this has already been shown for the breeding ranges of central European and Arctic birds (Brommer et al. 2012). More study species (41; 69 %) shifted their range margin northwards than southwards (18; 31 %) (Χ2, p = 0.00275). Only a few range margin shifts were greater than three grid squares. An example of a species with a large shift in the southern border northward is the ruff Philomachus pugnax. Large shifts in the northern border occurred in coot, mute swan, common eider, razorbill and Arctic skua Stercorarius parasiticus suggesting range extension as the southern border did not move. The latter three species have extended their range much further north on the Atlantic Ocean and North Sea coasts. It is still unclear if climate change is involved in the range shifts and changes in the area of occupancy of the study species, since at least some of the shifts seem to have other causes.
3.2.8 Sea Level
Climate change may also affect the physical and biological features of islands through sea-level rise, storm events and erosion. By 2100, many regions currently experiencing a fall in relative sea level can be expected instead to experience a rise (Chap. 14), reversing current land uplift in Baltic Sea archipelagos . Together with storm events and erosion, sea-level rise could affect the succession in coastal bird and seabird breeding habitats. In addition, climate factors affect the productivity of the vegetation cover, which in turn may influence species richness and distribution, as shown by Eronen et al. (2011) for Finnish land birds.
3.2.9 New Species
Climate change may facilitate the settlement of new species that are either spreading to the Baltic Sea area naturally or that have been deliberately or accidentally introduced by humans. The effects of climate change on salinity and water temperature can facilitate invasion by non-indigenous aquatic species, which can cause major changes in nearshore ecosystems (Zaiko et al. 2011) and thus affect the food resources of birds . Climate change may also increase the survival and reproductive prospects of vagrant birds and increase the numbers of, for example, vagrant Siberian birds in Europe (Jiguet and Barbet-Massin 2013).
3.2.10 Changes in Distribution
Changes in the occurrence and distribution of bird species can be assessed using bird atlas data, such as the Finnish Bird Atlas data (Väisänen et al. 1998; Valkama et al. 2011). Changes in distribution of Finnish coastal and seabird species were studied by comparing data in the first and second Finnish Bird Atlases (1974–1989) (Väisänen et al. 1998) with those in the third (2006–2010) (Valkama et al. 2011). The data presented here cover 59 species in archipelago and coastal 10 km2 square cells, and to avoid bias from differences in research activity, only those cells where the research activity grade was the same in both data sets were compared.
According to a preliminary analysis (Lehikoinen E unpubl.), the area of occupancy (for a description of this concept see Rassi et al. 2010, p. 31) had contracted for 10 (17 %) study species and expanded for 12 (20 %), while 37 (63 %) showed no significant change. Species with the largest contractions were the ruff, common pochard Aythya ferina, greater scaup and northern pintail Anas acuta. Species with the largest expansions were the great cormorant Phalacrocorax carbo, barnacle goose Branta leucopsis, whooper swan Cygnus cygnus, and Canada goose Branta canadensis. Of the species with the largest expansions, the great cormorant settled on the Finnish coast in 1996, the barnacle goose in 1981 and the Canada goose in the 1970s (Valkama et al. 2011).
The observed changes in species distribution and density (e.g. Virkkala and Rajasärkkä 2011) can be contrasted with the projections of European species range shifts by Huntley et al. (2008) using a model based on climate-envelopes. The authors predicted that with the current rate of climate change, bird communities in the Baltic Sea area (including all species) may be among the richest in Europe by 2100. Baltic Sea countries may experience a loss of some species which would in turn be replaced by particularly southern species. The predictions infer major changes in coastal bird and seabird communities in particular.
3.3 Implications for Seabird Management and Conservation
The effects of climate change on the breeding and feeding ecology of coastal birds and seabirds may first become visible near the limits of their ranges (Barrett and Krasnov 1996; Montevecchi and Myers 1997). Climate change effects might become discernible relatively early in the ecosystems of the Baltic Sea that can be considered marginal because of its distinctive features.
As integral parts of marine ecosystems, seabirds and coastal birds may fill some of the gaps in knowledge about marine and coastal ecosystems under stress. They may even act as indicators of climate change (Furness and Camphuysen 1997; Rönkä et al. 2005), providing early warnings of unforeseen environmental impacts and means to monitor changes at lower trophic levels. Habitat changes, as well as density and distribution shifts should be taken into consideration in species and habitat protection, including the management of currently protected areas and the planning of future conservation efforts (Virkkala and Rajasärkkä 2011). As climate change is already rapidly reshaping species distributions, ignoring future dynamics could lead to misguided and potentially ineffective conservation decisions (Kujala 2012).
Effective measures for the management and conservation of coastal birds and seabirds and their habitats require insight into their population processes and the factors affecting their distribution and abundance. A coherent monitoring system is needed, addressing population size, reproductive success and mortality (Järvinen 1983; Kilpi 1985; O’Connor 1985; Tiainen 1985; Elmberg et al. 2006; Sutherland 2006; Rönkä et al. 2011). Background data on environmental factors should also be collected.
Owing to the uncertainties concerning climate change scenarios (see Chaps. 10–14), assessing possible effects on coastal birds and seabirds is challenging. The multiple and partly contradictory effects and possible thresholds in the relationship between environmental drivers and ecosystem change add to the complexity. In addition, differences in the ecology of species must be considered (Rönkä 2008). Due to the many environmental pressures on the Baltic Sea, more studies are needed on the relative effects and possible interactions of different environmental changes, such as climate change and eutrophication (Kotta et al. 2009; Põllumae et al. 2009). In addition, a flyway approach is needed as some effects of climate change may act in breeding or wintering areas far from the Baltic Sea (Hario et al. 2009).
4 Climate Change Effects on Forests and Natural Vegetation
This section describes the effects of climate change on trees and forests in general—impacts on agriculture and managed forestry are addressed in Chap. 21.
4.1 Effects on Forest Growth
The overriding impacts of climate change on forest growth within the Baltic Sea basin, after the greater risks of extreme weather events such as prolonged drought, storms and flood (Lindner et al. 2010), are considered to be changing patterns of precipitation, increased carbon dioxide (CO2) concentrations and rising temperature. The latter may drive an increase in evapotranspiration and, potentially, increased microbial activity which could cause more rapid decomposition of soil organic matter (Magnani et al. 2007). Increased microbial activity would lead to mineralisation and related fertilising effects which would be especially important at previously nutrient-deficient forest sites. Nitrogen emissions from human activities are already having potential fertilising effects so it is difficult to isolate improved nitrogen availability due to higher temperatures. Nevertheless, the end result is expected to be increased tree growth in forests, with the impact greatest at high latitudes and on sites of historical nutrient deficiency (Burschel and Huss 1997; Dengler 1992). Although understanding of nutrient dynamics at high latitudes is limited (Gundale et al. 2011), it seems likely that rising temperature is the major driver (Karjalainen 1996a).
Schulze et al. (2009) stated that at any one moment, the rate of carbon uptake at a particular site would depend on the age composition and density of the stand. They also stated that forest management influences growth rates by controlling species composition and stand density and that management practices have changed over recent decades. Additional factors that might influence forest growth rates are increased temperature and CO2 concentration or nitrogen deposition from the atmosphere. According to Körner et al. (2005), increased CO2 concentration alone would not cause increased growth, which assumes that other limiting factors such as nutrient deficiency may dominate. Similarly, Magnani et al. (2007) concluded that forest net carbon sequestration is overwhelmingly driven by nitrogen deposition, largely from human activities. Nevertheless, de Vries et al. (2009) stressed the high uncertainties related to carbon sequestration per unit weight nitrogen addition.
Pussinen et al. (2009) saw a meaningful increase in growth rates in forests in Scandinavian countries and Finland of up to 75 % in their models compared to a scenario without climate change. In more detail, Karjalainen (1996a) described a model-estimated (gap-type forest model interfaced with a wood product model) increase in carbon sequestration in Scots pine Pinus sylvestris, Norway spruce Picea abies and silver birch Betula pendula stands over 150 years on medium fertile sites in northern and southern Finland (Table 16.2). It is clear that in relative terms, boreal forest stands benefit more from climate change than temperate forest stands. Similar results were found by Alam et al. (2008) who showed, using an ecosystem model, that climate change may substantially increase the growth, timber production and carbon stocks of forest stands. They found the greatest relative change in northern Finland (north of 64°N) with growth increasing by 75–78 %, timber production by 59–70 % and carbon stocks by 21–23 %. Increases in southern Finland (south of 64°N) were lower at 37–45, 23–40 and 8–10 %, respectively, although the absolute (mean) values were higher.
Nabuurs et al. (2008) and the first assessment of climate change in the Baltic Sea area (BACC Author Team 2008) reviewed the sensitivity of the main Baltic tree species to climate change. The BACC assessment concluded that coniferous species (Scots pine and Norway spruce) respond positively to rising temperature by showing higher stem growth. This is especially the case for the higher latitudes where temperature and nutrient deficiencies are limiting factors, and in general where precipitation is not limiting (Mäkipää et al. 1998; Bergh et al. 2003; Lindner et al. 2010). However, in the temperate forest zone (in the southern part of the Baltic Sea basin), a potential fertilisation effect by increased CO2 concentrations and enhanced nitrogen availability seems to be dominated by water stress, although the effect of elevated CO2 concentrations may counteract such potential negative effects (BACC Author Team 2008). A stronger potential fertilisation effect of increased CO2 concentrations can be expected in northern latitudes, where increased precipitation is projected.
Birch (Betula spp.), the main deciduous species in the boreal zone responds to rising temperature in the same manner as spruce and pine, but is less sensitive to changes in precipitation. In contrast, oak (Quercus spp.) and common beech (Fagus sylvatica) show a generally strong response to precipitation changes in temperate zones. While the growth of beech generally responds negatively to increased temperature, oak shows a weak positive response (BACC Author Team 2008).
Karjalainen (1996b) reported similar conclusions, reporting increased forest ecosystem production under a changing climate in northern Finland and a decline in Norway spruce in southern Finland. The carbon sequestration potential of Norway spruce declined sharply in southern Finland. This corresponds to the results of the first BACC assessment (BACC Author Team 2008) and of Kellomäki and Kolström (1994) and reflects the major impact of water stress (compare Bergh et al. 2003; Lindner et al. 2010).
Similar results were reported by Köhl et al. (2010) for temperate zones in north-eastern Germany: the authors found severe challenges to tree species sensitive to water stress (i.e. in this study, Norway spruce) with model simulations over a 100-year period projecting a decline in those species in north-eastern Germany for all scenarios.
With a focus on changing patterns of precipitation and temperature, Lasch et al. (2002) reported the likely future effects of climate change on forests in the Federal State of Brandenburg (Germany)—which can be used as a proxy for the south-westernmost part of the Baltic Sea basin. The results suggested that warming would lead to a shift in the natural species composition towards more drought tolerant species, that the diversity of the forests would decline and that groundwater recharge would decrease.
4.2 Effects on Natural Vegetation
To investigate the possible impacts of climate change on natural vegetation, studies were undertaken using the IPCC SRES scenarios for the twenty-first century. The studies indicated that species could shift, with a tendency for species to shift northwards and eastwards in the Baltic Sea basin (Ohlemüller et al. 2006; Wolf et al. 2007). Hickler et al. (2012) used a vegetation model to project changes in Europe’s natural vegetation and showed that a considerable part of the Baltic Sea basin could undergo a change in species composition, with a predominant northward shift in the hemiboreal and temperate mixed forests. Arctic and alpine regions showed particularly large changes. Similarly, Thuiller et al. (2005) reported high sensitivity for plant diversity in the Arctic and mountainous regions. Species loss was projected to be greater in the southern part of the Baltic Sea basin than the northern, but the region has high potential for species to migrate in from the south (Thuiller et al. 2005). However, a study by Chytrý et al. (2012) which separated different land-use classes showed that forests were generally least sensitive to plant species migration .
4.3 Effects on Carbon Storage
For managed forests, the Baltic Sea basin has been projected to see a rise in annual increment in carbon sequestration for all SRES scenarios (Nabuurs et al. 2002; Eggers et al. 2008). This would cause the relatively low net ecosystem productivity of forestry in the region (Luyssaert et al. 2010; Bellassen et al. 2011) to approach that of central and southern Europe.
In general, terrestrial carbon storage is anticipated to increase in the Baltic Sea catchment (Wolf et al. 2007; Zaehle et al. 2007; Roderfeld et al. 2008) although higher temperatures have the potential to increase respiration and thereby loss of carbon (Piao et al. 2008). The greatest uncertainties for the carbon balance concern interactions with nitrogen (Churkina et al. 2010), although reduced nitrogen deposition might be offset by more favourable climatic conditions for plant growth in the future (de Vries and Posch 2011).
Land-use change can play an important role in the terrestrial carbon cycle (Zaehle et al. 2007) and can have both positive and negative impacts on carbon storage.
5 Conclusion
This chapter describes the impacts of climate change on the coastal and terrestrial ecosystems of the Baltic Sea basin. The presence of fragmented and geomorphologically complex archipelago coasts is a particular feature of the central and northern part of the Baltic Sea. Archipelagos have high value for biodiversity due to the ‘edge effect’ and to the high number of different habitats. On the other hand, archipelago ecosystems are vulnerable to climate-mediated changes in the environment. A special characteristic of the Baltic Sea region is post-glacial land uplift. Together with climatic change, land uplift creates a complex situation where plant and animal communities must adapt to a new environment modified by both of these factors. The combined effects of climate change and land uplift on coastal ecosystems have been little studied and need particular emphasis in the future.
Warmer terrestrial ecosystems and warmer coastal sea water affect the northward migration of terrestrial and aquatic species and result in longer reproductive periods for coastal fauna and flora. The biodiversity of the Baltic Sea is particularly sensitive to changes in salinity, which can have a cascading effect on food webs and interaction between aquatic and terrestrial ecosystems. The effects of climate change on salinity and water temperature can facilitate invasion by non-indigenous aquatic bird species, such as cormorants, which can cause major changes in coastal bird communities. The climate-mediated changes can also facilitate the invasion of mammalian predators which can cause major changes in coastal and archipelago ecosystems.
The positive impacts of climate change on forest growth will continue. In relative terms, boreal forest stands benefit more from the climate change than temperate forest stands.
The Baltic Sea drainage basin is expected to undergo a change in the species composition of natural vegetation, with a predominantly northward shift of the hemiboreal and temperate mixed forests. Projected losses of species are greater in the southern part of the Baltic Sea basin than in the north.
Terrestrial carbon storage is likely to increase in the Baltic Sea catchment area. However, land-use change can play an important role in the terrestrial carbon cycle and have both positive and negative impacts on carbon storage.
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Niemelä, P. et al. (2015). Environmental Impacts—Coastal Ecosystems, Birds and Forests. In: The BACC II Author Team, . (eds) Second Assessment of Climate Change for the Baltic Sea Basin. Regional Climate Studies. Springer, Cham. https://doi.org/10.1007/978-3-319-16006-1_16
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