To safeguard the sustainable use of ecosystems and their services, early detection of potentially damaging changes in functional capabilities is needed. To support a proper ecosystem management, the analysis of an ecosystem’s vulnerability provide information on its weaknesses as well as on its capacity to recover after suffering an impact. However, the application of the vulnerability concept to ecosystems is still an emerging topic. After providing background on the vulnerability concept, we summarize existing ecosystem vulnerability research on the basis of a systematic literature review with a special focus on ecosystem type, disciplinary background, and more detailed definition of the ecosystem vulnerability components. Using the Web of ScienceTM Core Collection, we overviewed the literature from 1991 onwards but used the 5 years from 2011 to 2015 for an in-depth analysis, including 129 articles. We found that ecosystem vulnerability analysis has been applied most notably in conservation biology, climate change research, and ecological risk assessments, pinpointing a limited spreading across the environmental sciences. It occurred primarily within marine and freshwater ecosystems. To avoid confusion, we recommend using the unambiguous term ecosystem vulnerability rather than ecological, environmental, population, or community vulnerability. Further, common ground has been identified, on which to define the ecosystem vulnerability components exposure, sensitivity, and adaptive capacity. We propose a framework for ecosystem assessments that coherently connects the concepts of vulnerability, resilience, and adaptability as different ecosystem responses. A short outlook on the possible operationalization of the concept by ecosystem vulnerabilty indices, and a conclusion section complete the review.
Ecosystem services sustain and fulfill several demands of human life but rely on ecosystem processes and associated species (Daily 1997). A sustainable use of ecosystems implies a balance between protection and exploitation. Because ecosystems are defined by a close functional interconnection between their constituting abiotic and biotic elements, any use will change their conditions. Therefore, a condensed measure to assess the potential damage to ecosystems’ structures and functionalities, as well as their capacities to recover, ahead of the change would help achieve such a balance.
A vulnerability analysis is an adequate method for understanding the weaknesses of a system and is strictly orientated towards the threat that potentially would harm the system (Wisner et al. 2004). In general, vulnerability is defined as the potential for loss (Adger 2006; Brooks 2003; Füssel 2007; IPCC 2014), but rarely has been transferred for application to ecosystems. An ecosystem vulnerability assessment could be used to estimate the inability of an ecosystem to tolerate stressors over time and space (Williams and Kapustka 2000). Those vulnerable ecosystems then would need a proper management to preserve their characteristics. Any kind of ecosystem management is a result of governance processes responding to ecological, socio-cultural and economic drivers (Simoncini 2011) and aims to maintain desirable levels of ecosystem function in a cost-effective and socially responsible manner (Brussard et al. 1998). It is called ecosystem-based management because it recognizes all interactions within an ecosystem, including humans (Leslie and McLeod 2007). Slocombe (1993) summarizes that ecosystem-based management is a matter of redefining management units and building on scientific knowledge on the biophysical resource use limits. Available measures for ecosystem management are to reduce local and regional stressors, designate protected areas as refuges (Okey et al. 2015), increase ecosystem resilience (e.g., Anthony et al. 2015), or involve the implementation of other conservation strategies specific to each ecoregion (cf. Watson et al. 2013).
To communicate the results of vulnerability assessments to other researchers, policy-makers, and the community at large, it is important to map vulnerability distributions (Eakin and Luers 2006), and therefore to be spatially explicit. The mapping could indicate ecosystem vulnerability hotspots that may require specific intervention of protection and maintenance (Aretano et al. 2015; Zurlini et al. 1999). So far, there are limited successful ecosystem vulnerability studies focusing on the management of natural areas or conservation (Ventura and Lana 2014), but socio-environmental studies have been undertaken longer (Villa and McLeod 2002).
Next to its application benefit for ecosystem management purposes, the concept also bears potentials for theoretical progress. To further shape the definition of ecosystem vulnerability and to investigate its relation to other theoretical concepts from ecology, will contribute to develop vulnerability towards a boundary object (cf. Collet 2012). Boundary objects could steer interdisciplinary research that seems indispensable to tackle the—typically complex—research questions related to ecosystem management or socio-ecological systems.
This review is structured according to four main objectives: (i) to provide background on the vulnerability concept; (ii) to summarize existing ecosystem vulnerability research with a special focus on ecosystem type, disciplinary background, and definition of the ecosystem vulnerability components; (iii) to place ecosystem vulnerability in coherence with the ecological concepts of resilience and adaptability, and (iv) to give a short overview on ecosystem vulnerability assessment methods ready for application.
Background: The Vulnerability Concept
The idea of vulnerability is based on research on natural hazards affecting human structures and communities (Janssen et al. 2006). This introduced an objectivist understanding of risk to the concept, which has been revised by the argument of risk as a matter of perception (Bürkner 2010; Weichselgartner 2001). For the analysis of social systems, the emphasis on a system’s weakness is prone to criticism, as different social groups could be stigmatized, for example, regarding gender, income, educational level, or ethnicity (Bürkner 2010; Collet 2012). In the vulnerability of social-environmental systems, Eakin and Luers (2006) traced down the scientific roots to the three research fields of risk-hazard, political economy/political ecology, and ecological resilience. Two major antecedents for a shared definition of vulnerability are the risk-hazard and the pressure-and-release model (cf. Turner et al. (2003)). Risk-hazard models emphasize exposure and sensitivity to perturbations and stressors forming the impact of the hazard; and pressure-and-release models emphasize distinctions in risk related to different vulnerabilities of different exposure units, while both underemphasize the system’s ability to cope with the disaster and learning from it (ibid.). This lead to the idea of adaptive capacity, which conceptually could link vulnerability and resilience research, and turned vulnerability assessments to the purpose of identifying feasible adaptation strategies (Engle 2011; Smit and Wandel 2006).
Interdisciplinary vulnerability concepts mainly developed with climate change research and its increasingly broad applications (e.g., IPCC 2007; IPCC 2014). Related to this, global environmental change research also has seen increased attention to the concept of vulnerability (Polsky et al. 2007; Schröter et al. 2005). A general uniform definition has been lacking for a long time (Brooks 2003) because several scientific disciplines have emphasized and advanced different scientific aspects of vulnerability research (Schluchter 2002). Nevertheless, an overarching definition would describe vulnerability as a potential for loss (Adger 2006; Brooks 2003; Füssel 2007; IPCC 2014). Further, several systematic attempts to establish an interdisciplinary methodological framework for vulnerability research outlined vulnerability as a function of exposure, sensitivity, and adaptive capacity (Frazier et al. 2014; Füssel 2007; Turner et al. 2003). According to the state of the art, we further define vulnerability by its three constituting elements as follows:
“exposure” describes the probability of a hazard (also: disturbance or stress) occurring;
“sensitivity” is a measure of susceptibility to this hazard;
“adaptive capacity” characterizes the ability to cope with the hazard and its consequences.
In this context, we suggest vulnerability as a boundary object, as it enables interdisciplinary scientific exchange without abandoning a specialist’s inventory of methods (Collet 2012). Typically, a vulnerability analysis integrates different methods from across several research traditions (Polsky et al. 2007).
A more recent and specific notion of vulnerability, but one consistent with the general framework, is ecosystem vulnerability. In this perspective an environmental system moves from a traditional view as a source of hazard that influences human systems to a responding system influenced by natural and anthropogenic drivers of change. Birkmann and Wisner (2006) called this a biocentric view of ecological vulnerability, in contrast to an anthropocentric view. It encompasses the analysis of the fragility and susceptibility of ecosystem components or functions themselves. A very prominent initiative for such an approach is the Environmental Vulnerability Index developed by the South Pacific Applied Geoscience Commission in cooperation with the United Nations Environment Program. This index is based on 50 indicators for estimating a general vulnerability of the environment to future shocks, calculated for each country on the globe (Kaly et al. 2004).
This review analyzes the emerging concept of ecosystem vulnerability and is based on a literature search in the Web of ScienceTM Core Collection (enabling the following databases: SCI-EXPANDED, SSCI, CPCI-S, CPCI-SSH, BKCI-S, and BKCI-SSH). First, a title search provided descriptive overview on the development of the different terms connected with the vulnerability of natural systems (this section). Second, the main search covered the title, abstract, author keywords and keywords plus® and provided the literature sample for the structured review (following sections).
To support a conceptual analysis, the literature search was designed to focus on scientific articles that explicitly refer to the vulnerability concept, recognizing this would exclude literature on “resilience”, “risk”, “damage”, “degradation”, or “change” that may be related to the discussion on ecosystem vulnerability. To cover the broad disciplinary roots of a vulnerability analysis of natural systems, the search included the terms “ecosystem vulnerability”, “ecological vulnerability”, and “environmental vulnerability”. We aimed to cover vulnerability research on several ecological scales and therefore considered the vulnerability of populations, communities, and habitats. Unfortunately, the term “community vulnerability” turned out to be unsuitable, as very few related to ecological communities, with the others relating to human communities. Therefore, we only added “population vulnerability” and “habitat vulnerability” to the query, which connected the exact terms with OR and was last updated on June 22nd, 2016.
For overviewing the usage of the vulnerability concept applied to ecosystems research, we started to search the publication title over 25 years, from the beginning of 1991 to the end of 2015, and itemized the different terms (see Fig. 1). Note that articles including socio-ecological vulnerability were also covered, but these comprised only 5% of the results returned due to the term “ecological vulnerability”.
In our sample of 149 papers ranging from 1991 to 2015, the term habitat vulnerability occurred earliest, but with only three articles; it appears to be rather unestablished. In the nineties, the terms environmental and ecosystem vulnerability arose. While environmental vulnerability gained remarkable attention from 2009 onwards and exhibited the most applications over the entire period, the use of the term ecosystem vulnerability only caught on very recently. In our sample, the term ecological vulnerability occurred late, first in 2003, but its use increased sharply in 2010, reaching a total maximum of 10 articles in a year. The term population vulnerability varied between 5 and only 1 title mention per year; therefore, this term seems to not play a major role in this research field, yet.
For the main search, the same five vulnerability terms were applied to TOPIC. To cover the period of increased interest in the concept from 2010 onwards (indicated by the annual number of publications constantly exceeding 10, see Fig. 1) and to reach an adequate number of articles for in-depth analysis, we limited our literature to the five years from 2011 to end of 2015 while excluding all document types other than articles and reviews in English. The resulting 238 articles we filtered by abstract reading to sort out any artifact items and articles not related to the vulnerability of natural systems (e.g., public health vulnerability). During this process, we found the term “population vulnerability” repeatedly used to refer to human populations instead of natural populations (species or species assemblages) and “environmental vulnerability” used, to a minor extent, to refer to psychological phenomena. Furthermore, we identified some articles using “environmental vulnerability” as a combination of both biophysical and socioeconomic factors that affect a human-natural system. Because such an understanding of environmental vulnerability does not focus on ecosystems as the responding system (cf. “Background: the Vulnerability Concept” section), these were also omitted. Overall, 129 articles were reviewed. Additionally, for the three sections prior to 'Conclusions' other thematic leading publications (e.g., published before 2011 or not in the Core Collection) were considered to give a comprehensive picture.
For the analysis of the investigated ecosystem type and disciplinary roots (cf. next section), we decided to cite references exemplarily if the number of articles belonging to one group was too high to cite all of them. To safeguard reproducibility, we cited the top three articles ranked by the SJR index (SCImago 2007) from their publishing journal in the publication year of the article, and as a secondary criteria, we selected the most recent article. To give a diverse picture, we did not choose two articles from the same journal.
Vulnerability of Different Ecosystems and in Different Disciplines
To reach a profound understanding of the concept of ecosystem vulnerability, which is necessary to provide a so far lacking comprehensive and in-depth definition, the disciplinary roots may reveal characteristic orientations. A too narrow scope in the major application areas (in the sense of the natural systems under investigation) could have biased the conceptual development or identify gaps in ecosystem vulnerability research. Therefore, we also paid attention to the type of ecosystem that has been assessed.
More than half of the 129 reviewed ecosystem vulnerability studies apply to a certain type of ecosystem (for an overview, see Table 1). These 72 articles exhibited a major focus on water-related ecosystems: marine and coastal ecosystems (including mangroves) accounted for 30 papers (e.g. Anthony et al. 2015; Guizien et al. 2014; Ifrim et al. 2011) and freshwater ecosystems (including rivers, lakes, and wetlands), accounted for 22 papers (e.g., Alric et al. 2013; Landguth et al. 2014; Macary et al. 2014). Another focus was also given to forest ecosystems (e.g., Hwang et al. 2014; McWethy et al. 2013; Zolkos et al. 2015). Only three articles dealt with grassland ecosystems (Lopez-Poma et al. 2014; Qiao et al. 2013; Ursino 2014), and only one was concerned with agricultural ecosystems (Couto et al. 2015). Additional two articles were concerned with desert ecosystems (Cruz-Elizalde et al. 2014; Munson et al. 2015) and one with an oasis (Pei et al. 2015). The other 57 articles involved vulnerability analysis at a different kind of spatial scale, for example, administrative regions, river-basins, or climatic zones.
Observing the (explicitly stated) disciplinary origin of the articles was the task to identify the main scientific communities that promote the concept of ecosystem vulnerability. Note that each article potentially belonged to more than one research field.
A total of 54 of the reviewed articles were strongly linked to conservation ecology (≈42%). Of these, 29 articles addressed a wide range of particular species: ten articles focused on aquatic species (e.g., Ateweberhan et al. 2011; Guizien et al. 2014; Landguth et al. 2014), nine on plant species (e.g., Arianoutsou et al. 2013; Gonzalez-Moreno et al. 2013; Kalusova et al. 2013), five on bird or bat species (e.g., Erickson et al. 2015; Furness et al. 2012; Tranquilla et al. 2013) and five on other animal species (e.g., Drever et al. 2012; Dufresnes and Perrin 2015; Lacasella et al. 2015). Furthermore, 15 addressed whole habitats (e.g., Gauthier et al. 2013; Giakoumi et al. 2015; Kalusova et al. 2013), and four focused on the vulnerability of the protected area itself (e.g., Aretano et al. 2015; Cruz-Elizalde et al. 2015; Tomczyk 2011). Eight of the 54 articles related to conservation ecology investigated the vulnerability to invasive species (e.g., Hulme 2012; Kalusova et al. 2013; Olden et al. 2011). Further, from an ecological and evolutionary perspective, Diaz et al. (2013) framed response functions opposed to specific effect functions of certain species for vulnerability analysis of ecosystem services.
Ecosystems and geographic regions were classified as vulnerable to climate change in the latest IPCC Assessment Report (IPCC 2014). A reference to the vulnerability of ecological systems to climate change could be found in 30 studies (≈23%); of these, 8 were in connection with nature conservation. Beyond our literature sample, we found that ecosystem vulnerability to climate change is commonly analyzed by using ecological response models (NWF 2011) and climate adaptation of ecosystems is implemented via the so-called MARISCO approach (Ibisch and Hobson 2014, for example).
An ecosystem-related concept of vulnerability was also discussed in ecotoxicology (De Lange et al. 2010), particularly in the context of ecological risk assessment (ERA), which is conceptually close to ecosystem vulnerability (Chen et al. 2013). In our literature sample, we found 21 articles attributable to ERA (≈16%). An additional paper dealt with contamination in a regional risk assessment (Zabeo et al. 2011). The ERAs were applied to aquatic ecosystems (e.g., Agatz et al. 2012; Gergs et al. 2013; Kulkarni et al. 2014), and fewer addressed contamination of the soil (e.g., Couto et al. 2015; Pinedo et al. 2014; van Gestel 2012) or groundwater (Caniani et al. 2015).
To a minor extent, landscape ecology was present (12 articles), often in connection with fire regimes. The remaining articles, which have not been assigned to any of the aforementioned disciplinary groups (≈25%), rather occasionally shared a common research area. They often addressed ecosystem vulnerability to multiple environmental changes and included a strong integrated management orientation (e.g., oil pollution management). Other related research fields expected to be found explicitly, like restoration ecology (5 articles), environmental impact assessment (3 articles), ecosystem-based management (1 article), and natural resource management (no article), so far seemed not to have substantially adopted the concept of ecosystem vulnerability.
Defining Ecosystem Exposure, Sensitivity, and Adaptive Capacity
The application of the vulnerability concept generally has been approached through its three components: exposure, sensitivity, and adaptive capacity. Nevertheless, our review identified rather diverse or incomplete definitions of ecosystem exposure, ecosystem sensitivity, and ecosystem adaptive capacity. Understandably, the formative influences, from several research traditions (cf. “Background: the Vulnerability Concept” section), coined different meanings of ecosystem vulnerability. Therefore, we furthered the application of the concept by delivering a clear and general description of the meanings of ecosystem exposure, ecosystem sensitivity and ecosystem adaptive capacity. We paid heed to a common understanding of the three elements of ecosystem vulnerability, which were often—but not always—mentioned implicitly only.
Exposure of Ecosystems
The exposure of an ecosystem expresses the degree of change that it is projected to experience (e.g., Cabral et al. 2015; Zolkos et al. 2015). According to the abruptness of the change, the terms disturbance (abrupt) and stress (continuous) can be distinguished. A disturbance or shock could have consequences of similar severity for an ecosystem as an enduring or increasing stress perceived as nearing a threshold or tipping point (Redman 2014). Examples in our literature sample of these exposures were effects of climate change (e.g., Moe et al. 2013; Okey et al. 2015), land use changes like deforestation or urbanization (e.g., Ventura and Lana 2014), invasive species (e.g., Arianoutsou et al. 2013; Olden et al. 2011), and effects from pesticides (van Gestel 2012), oil spill (Cai et al. 2015) or other toxicants (e.g., Vigneron et al. 2015). According to Ippolito et al. (2010), the different stressors should be addressed by single and separate vulnerability assessments as long as the combining effects and interrelations are not yet fully understood. Nevertheless, unassessed stressors are present and could influence the investigated vulnerability and combining effects may show most relevance to ecosystem management. For example, Agatz et al. (2012) investigated the combined effects of different chemicals on Daphnia magna populations, and Alric et al. (2013) combined climate warming with changes in nutrient inputs and fisheries management practices for lake ecosystems.
With regard to the term “disturbance”, we adhere to the absolute definition (in contrast to relative disturbance). According to this definition, disturbances can be determined as directly measurable changes in an ecosystem and are independent of statistical distribution, a recurrence period or predictability that would define a relative disturbance. White and Jentsch (2001) described the properties of disturbances, of which those deriving from exogenous factors were assigned as features of exposure. These are, on the one hand, the expansion and spatial distribution of disturbance (in relation to ecosystem size or ecosystem heterogeneity) and, on the other hand, the duration and frequency of the disturbance (in relation to ecosystem lifespan or recovery time). To assess the exposure of an ecosystem, the probability of a disturbance or spatial proximity to a disturbance source could guide the analysis (Frazier et al. 2014). Another option is to analyze the amount of (spatially located) system elements that are affected by a given disturbance. For example, this could mean determining the area of the ecosystem under threat (Dong et al. 2015).
Sensitivity of Ecosystems
Given a certain disturbance or stress, sensitivity describes the susceptibility of the ecosystem. It expresses the degree to which a system is likely to be affected by or be responsive to the change (cf. Zolkos et al. 2015) and could tell us about the expected severity of the impact. A long-term exposure to one stress may lead to the development of increased tolerance (or decrease in sensitivity), but potentially increases the vulnerability to other environmental changes. This could mean, for example, that according to micro-evolutionary processes the resulting population, which successfully survived a first stress from a toxicant, is less competitive for foraging and likely to be more affected to another stress like a nourishment-poor period (Vigneron et al. 2015). The sensitivity could be determined by specific indicators according to the ecosystem and exposure under investigation. Illustrative factors from our literature sample were, for instance, the elevation of coastal wetlands exposed to sea level rise (Chu-Agor et al. 2011), for river ecosystems under climate change the amount of flow (Abbasov and Smakhtin 2012) or resistance of water temperature to air temperature increase (Trumbo et al. 2014), the chemical susceptibility of freshwater ecosystems to toxicants (Ippolito et al. 2012), and abundance of habitat loss-sensitive fish species (compared to more generalist species) for a coral ecosystem exposed to bleaching (Cinner et al. 2013).
In contrast to exogenous disturbance factors, intensity and specificity are endogenous disturbance factors and are defined by the inherent properties of the ecosystem. However, these properties are hardly measured by holistic ecosystem indicators so far. Therefore, many aspects of ecosystem sensitivity are derived from the inherent characteristics of species (NWF 2011). For example, differences in sensitivity to environmental influences between functionally similar species stabilize ecosystem processes and related services. In contrast, if these differences exist predominantly between functionally differing species, an ecosystem tends to be more vulnerable to changes (Chapin et al. 1997). In conservation ecology this is referred to as species redundancy within functional groups (Rosenfeld 2002; Walker 1992).
In the context of human dependency on ecosystems and the consequences of a potentially dramatic decline in ecosystem services, it seems conceivable to view particular important ecosystems as high-reliability systems. The importance of an ecosystem could be derived from its relevance for water supply (local importance), food provision (e.g., regional importance), carbon sequestration (global importance), or any other ecosystem service that is hard to do without in a specific context. This borrowing from sociological technology studies implies that efficiency and profit maximization should be subordinate to the reliability of the system (Kaufmann and Blum 2013). The concept of ecosystem reliability (Naeem 1998) addresses sensitivity (or resistance) properties, not vulnerability as a whole. Substantial fluctuations in service provision (as would be accepted within the concept of resilient systems) should be prevented.
Adaptive Capacity of Ecosystems
Adaptive capacity describes a system’s ability to cope with the impact of a disturbance. In contrast to planned adaptation measures of a society or community, for natural systems the term autonomous adaptation appears (Metzger et al. 2006), emphasizing spontaneous ecological changes within the affected ecosystem. Therefore, the adaptation is self-organized by the ecosystem as a sum of responses of its biophysical entities. Although accounting for adaptive capacity is key in determining vulnerability, its characterization regarding natural systems is scarce (Okey et al. 2015).
The reviewed literature was scarce in descriptions of how to measure the adaptive capacity of a natural system. A few equaled it with a potential to recover, e.g., with a quick reproduction (number of seedlings produced per adult, number of juveniles per number of dead adults) from a mangrove forest (Ventura and Lana 2014), or with repopulation of a coral ecosystem with original species instead of leaving the field to competitors (Cinner et al. 2013). Others used the term resilience in a very similar meaning and tried to estimate it, for example, by the connectivity between ecosystems of the same type (Peng et al. 2015), the natural succession rate after a tsunami (Romer et al. 2012), the local vegetation cover (Zhang et al. 2015) or the local biodiversity in general (Song et al. 2015). Overall it seems that the adaptive capacity of ecosystems originates dominantly from the biological entities rather from the abiotic ecosystem components, but is hard to measure specifically. Therefore, the analysis of ecosystem adaptive capacity may be approached from the community of organisms and their interrelations. This would also include the ecological levels below a community of species: the adaptive capacity of single species, of single populations of these species, and even the capacity of individuals to adapt to a certain impact. Observations on the level of single plants indicate the existence of an ecological memory after drought, frost or heat stress, as their responses to such types of disturbances improved due to the stressors experienced. This supports the broader theory of ecological memory that refers to whole ecosystems and involves more than pure acclimatization or repopulation opportunities (Walter et al. 2013). On the species level, a high genetic differentiation within and between populations promotes adaptive capacity, which could differ between locations and along geographic distances (NWF 2011). Species respond according to their ability to maintain or enhance population quantity or to invade the disturbed environment afresh (Diaz et al. 2013). On the community level, this translates to a response diversity within a functional group of species (Elmqvist et al. 2003). A high adaptive capacity of plant communities would be governed in particular by species with a long-lived seed bank, ruderal strategy, and high regenerative and dispersion capacities (Van Looy et al. 2016). Similarly, the dispersal abilities of animal species (e.g., by migration) should be integrated to such a community assessment to better estimate the adaptive capacity of ecosystems.
Coherent Concepts for Ecosystem Assessment
The idea of vulnerability as a system’s characteristic is interrelated to other applied concepts of global change science, like exposure, sensitivity, resilience, adaptive capacity, and adaptation (Smit and Wandel 2006). As exposure, sensitivity, and adaptive capacity are directly included in vulnerability according to our definition, two main concepts remain for comparison regarding theoretical coherence for ecosystem assessment. Regarding socio-ecological systems Adger (2006) stated common terminological and methodological ground for the three concepts of vulnerability, resilience, and adaptation. Building on this, we suggest that the ecosystem response to a stress or a disturbance ultimately can be described being either: (i) vulnerable, (ii) resilient, or (iii) adaptive (see Fig. 2). Still, this framework leaves the question of how to define the reference state of regular variation ahead of the disturbance/ stress (or the original basin of attraction). A high or low undisturbed variability would clearly influence the interpretation of the system response. The boundary between a vulnerable and a resilient response would be based on the lower level of regular variation, measured by a threshold value of the investigated state variable. The same is for the boundary between a resilient and an adaptive response regarding the upper level of regular variation.
When expanding the concept of vulnerability to ecosystems, the question arises of whether vulnerability is in coherence with other measures of assessing an ecosystem’s response to a disturbance. Therefore, we sum up the specific relationship of vulnerability with the two closely related, established concepts of resilience and adaptability.
Vulnerability and Resilience
In the context of vulnerability, resilience arises as a general antithesis to vulnerability (Eakin and Luers 2006; Frazier et al. 2014; Kaufmann and Blum 2013). Vulnerability viewed as the opposite of resilience, is limited to the idea of coping and could profit from the natural science-driven perspective of resilience by understanding the responses to stressors (Renaud et al. 2010). Both vulnerability and resilience can be viewed as specific to a system and to a perturbation (Aretano et al. 2015).
Similar to ecosystem vulnerability, resilience is a dynamic indicator of ecosystem behavior following the occurrence of a disturbance. However, the concept of resilience was shaped in different schools of thought and the diversity of definitions leads to concurring or diverging meanings (Brand and Jax 2007; Fisichelli et al. 2016). Following the initial meaning of the word resilience (latin: resilire = rebound, spring back), we would consider the concept in no conflict with ecosystem vulnerability (see Fig. 2). This meaning was preserved when ecological resilience was introduced that describes the ability of a system to return to a former attractor state after a disturbance has occurred (Gunderson and Holling 2002; Müller et al. 2010). In comparison, vulnerable ecosystems would experience a regime shift to a new, in anthropogenic view often unfavorable attractor state. This builds on the original idea introduced by Holling (1973) of using resilience to explain the persistence of species that show high population variance, which was understood to be detrimental to survival. The duration of the recovery phase is used as an indicator of the resilience of a system (engineering resilience, according to Pimm 1984). In other approaches (Walker et al. 2006; Walker et al. 2004), disturbance intensities reveal the load frame within which a system can react resiliently. For ecological resilience, Redman (2014) identified a tendency to judge outcomes that maintain the conditions of the pre-existing system as a positive result, although a resilient system could be in an undesirable state and may be improved by change. Members of the resilience-alliance (2014) forged an overarching meaning of resilience of socio-ecological systems that subsumes a self-organizing capacity, a resistance to disturbances or stresses and an evolutionary adaptation and learning process (Carpenter et al. 2001; Folke et al. 2003). Nevertheless, these added components actually reflect non-resilient processes (Fisichelli et al. 2016; Müller et al. 2016) and we suggest to stay with the more strict definition explained above.
Vulnerability and Adaptability
The concept of adaptability was introduced to demonstrate that ecosystems follow certain optimization processes under undisturbed framework conditions in the succession process (Müller 1998), during which the values of selected variables (orientors, cf. Müller and Leupelt 1998) increase. In general, a natural entity maintains a dynamic response towards thermodynamic balance (Arreguin-Sanchez and Ruiz-Barreiro 2014). If a system responds to a disturbance by recovering, the initial values of the state variables (e.g., biodiversity) can be exceeded, showing an adaptive response (see Fig. 2). This has similarities to the concept of ecological memory that leads to an improved response after several disturbances of the same type (cf. Walter et al. 2013).
Adaptability (or the ability for adaptation) has a similar meaning as or is closely related to adaptive capacity (Smit and Wandel 2006), and therefore seems to be compatible with the concept of vulnerability. Further, adaptive capacity in turn has been identified as a common thread linking vulnerability and resilience (Engle 2011).
Operationalization of Ecosystem Vulnerability Assessments
Decision-makers often have to prioritize options for action on the ground and can only use theoretical concepts of vulnerability to a limited extent (Luers 2005). Therefore, this review offers a straightforward assessment procedure as an—by no means exhaustive—outlook for application.
A site-specific (“place-based”) reference to vulnerability seems indispensable (Cutter 1996). In contrast to supra-regional considerations, place-specific studies map the individual specifics of vulnerability characteristics more effectively. This is particularly the case in the context of analysing ecosystem functions and regulatory processes in connection with biodiversity and nature protection (Metzger et al. 2006). Moreover, proximity relationships and cumulative ecological degradation effects could be taken into account due to spatial referencing (Jackson et al. 2004).
Therefore, a common approach to assessing a system’s vulnerability is the overlap of spatial characteristics relating to a specific change or disturbance and summing them up in a vulnerability index (Frazier et al. 2014). Involving relatively little effort, index-based mapping enables a relatively wide range of factors to be considered compared to modeling. Vulnerability indices can be understood as systematically documented and transparent hypothesis frameworks that can be based on empirical data and expert opinions (Blatt et al. 2010). They can be applied as solution-oriented tools, evaluating scenarios and identifying trade-offs, rather than only assessing and monitoring existing conditions (Vollmer et al. 2016).
An index of ecosystem vulnerability should not be substantiated with general but stressor-specific environmental indicators that include information on exposure, sensitivity and the adaptive capacity of an ecosystem (Villa and McLeod 2002). Still, this entails difficult choices about the selection, standardization, weighting, and aggregation of indicators (Barnett et al. 2008). Possibly, the application of an analytical hierarchy process helps to create a weighted set of indicators in the GIS overlay procedure (e.g., Cai et al. 2015; Wang et al. 2015).
Applying the vulnerability analysis to natural systems creates new opportunities for efficient ecosystem assessment. It reveals the damage potential on the basis of a current constellation of factors and could function as an early warning system. We conclude that this ecosystem-oriented approach is still pioneering work compared to the overall vulnerability research and suggest using the term ecosystem vulnerability instead of environmental vulnerability (in parts interpreted as vulnerability to environmental factors) or ecological vulnerability (confused with research of socio-ecological systems that often investigate a coupled human–environment system suffering from a disturbance and responding to it). The terms population and community vulnerability would only be of comparable meaning in a strict ecological context. To not compromise the interdisciplinary application of the concept, in both cases we recommend strengthening the term ecosystem vulnerability, subsuming populations and communities of species under ecosystems.
Ecosystem vulnerability has been adopted most notably in conservation biology, climate change research and ERAs. Up to date, it has not significantly shaped the plenty of other research fields dealing with environmental impacts or ecosystem management. Marine and freshwater ecosystems are of major concern, followed by forest ecosystems, whereas agricultural or grassland ecosystems have rarely been considered so far.
The constituting elements ecosystem exposure, ecosystem sensitivity and ecosystem adaptive capacity can be defined consistently. Their more detailed description, deduced from the reviewed literature, underpins the theoretic basis of the ecosystem vulnerability concept.
A key advantage of the vulnerability concept is the coherence with resilience and adaptability as different kinds of ecosystem responses in combination with its function as a boundary object that potentially enables interdisciplinary exchange to better tackle complex problems, such as climate change and biodiversity loss. The creation of vulnerability indices is a straightforward option to efficiently implement the concept for ecosystem assessment and management.
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Peter Weißhuhn thanks for the receipt of a doctoral scholarship from the Deutsche Bundesstiftung Umwelt (DBU) in 2016/17.
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The authors declare that they have no conflict of interest.
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Weißhuhn, P., Müller, F. & Wiggering, H. Ecosystem Vulnerability Review: Proposal of an Interdisciplinary Ecosystem Assessment Approach. Environmental Management 61, 904–915 (2018). https://doi.org/10.1007/s00267-018-1023-8