Arthropods and novel bird habitats: do clear-cuts in spruce plantations provide similar food resources for insectivorous birds compared with farmland habitats?
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Arthropods, and insects in particular, constitute important food resources for several higher trophic levels like birds. Their abundance and diversity is likely to differ between habitat types depending on the local conditions and resources. This may have important consequences for arthropod consumers that occupy structurally different habitat types. Most bird-focused studies address, however, habitats at the structural, vegetation-based level and disregard the presence of sufficient quantities and qualities of arthropod prey items. Here, we compare the quantity and quality of ground-dwelling and above-ground arthropods as food resources for early-successional birds between two structurally different human-modified habitat types sharing similar bird assemblages: low-intensity farmland areas and plantation forest clear-cut areas in the south of Belgium. Forest clear-cut patches constitute a novel habitat for so-called ‘farmland’ birds. Our results show that arthropod abundance is substantially higher in farmland than in forest clear-cuts, although arthropods are slightly larger in clear-cuts. Higher arthropod abundance is associated with higher ground-level temperature in farmland. Although both habitat types host the same spectrum of arthropod species, forest and farmland management practices induce different conditions for food quantity and, to some extent, food quality for insectivorous birds. We discuss the mechanisms behind the observed pattern of arthropod abundance and the fitness-related consequences of contrasting food availability in farmland and forest clear-cut habitats for early-successional bird species.
KeywordsAgriculture Early-succession birds Habitat Insects Food Forest harvesting Resource-based approach
We are grateful to Hubert Baltus and Chris Pels for their helpful assistance for field and lab work. We also thank landowners for access facilities to private properties and the Service Public de Wallonie (DNF/DGARNE) for access to public sites. Franck A. Hollander was funded by the Belgian National Fund of Scientific Research (FRIA PhD-grant). Nicolas Titeux was financially supported by the National Research Fund of Luxembourg (C12/SR/3985735 COLLURIO project). This is publication number BRC 353 of the Biodiversity Research Centre (UCL).
- Cardador L, De Cáceres M, Bota G, Giralt D, Casas F, Arroyo B, Mougeot F, Cantero-Martinez C, Moncunill J, Butler SJ, Brotons L (2014) A resource-based modelling framework to assess habitat suitability for steppe birds in semiarid Mediterranean agricultural systems. PLoS ONE 9:e92790PubMedCentralCrossRefPubMedGoogle Scholar
- Halme E, Niemelä J (1993) Carabid beetles in fragments of coniferous fragments. Ann Zool Fenn 30:17–30Google Scholar
- Lecomte H, Florkin P, Morimont JP, Thirion M (2003) La forêt wallonne, état de la ressource à la fin du 20ème siècle. In: Ministère de la Région Wallonne, Division de la Nature et des Forêts, JambesGoogle Scholar
- Snow DW, Perrins CM (1998) The birds of the western palearctic. Oxford University Press, OxfordGoogle Scholar
- Speight MR, Hunter MD, Watt AD (2008) Ecology of insects: concepts and applications. Wiley-Blackwell, Oxford, p 628Google Scholar
- Van Wilgenburg SL, Mazerolle DF, Hobson KA (2001) Patterns of arthropod abundance, vegetation, and microclimate at boreal forest edge and interior in two landscapes: implications for forest birds. EcoScience 8:454–461Google Scholar