Environmental species sorting dominates forest-bird community assembly across scales

Özkan, Korhan
Jeppesen, Erik
Environmental species sorting and dispersal are seen as key factors in community assembly, but their relative importance and scale dependence remain uncertain, as the extent to which communities are consistently assembled throughout their biomes. To address these issues, we analysed bird metacommunity structure in a 1200-km2 forested landscape (Istranca Forests) in Turkish Thrace at the margin of the Western Palaearctic (WP) temperate-forest biome. First, we used spatial regressions and Mantel tests to assess the relative importance of environmental and spatial factors as drivers of local species richness and composition within the metacommunity. Second, we analysed species' abundanceoccupancy relationship across the metacommunity and used null models to assess whether occupancy is determined by species' environmental niches. Third, we used generalized linear models to test for links between species' metacommunity-wide occupancy and their broader WP regional populations and assessed whether these links are consistent with environmental species sorting. There was strong environmental control on local species richness and composition patterns within the metacommunity, but non-environmental spatial factors had also an important joint role. Null model analyses on randomized communities showed that species' occupancy across the metacommunity was strongly determined by species' environmental niches, with occupancy being related to niche position marginality. Species' metacommunity-wide occupancy correlated with their local abundance as well as with their range size and total abundance for the whole WP, suggesting that the same assembly mechanisms act consistently across local to regional scales. A species specialization index that was estimated by bird species' habitat use across France, incorporating both niche position and breadth, was significantly related to species' occupancy and abundance at both metacommunity and WP regional scales. Hence, the same niche-related assembly mechanisms appear to act consistently across the WP region. Overall, our results suggest that the structure of the Istranca Forest' bird metacommunity was predominantly controlled by environmental species sorting in a manner consistent with the broader WP region. However, variability in local community structure was also linked to purely spatial factors, albeit more weakly.


Cascading effects of elevation, soil moisture and soil nutrients on plant traits and ecosystem multi-functioning in Poyang Lake wetland, China
Fu, Hui; Yuan, Guixiang; Ge, Dabing; Li, Wei; Zou, Dongsheng; Huang, Zhenrong; Wu, Aiping; Liu, Qiaolin; Jeppesen, Erik (2020-03-04)
Trait-based approaches have been used to explore ecosystem level consequences of local changes in biodiversity along environmental gradients. Using a novel response-effect trait framework, we seek to identify and explain the mechanisms governing the cascading effects of environment on plant traits and ecosystem multi-functioning in the large Poyang Lake wetland, China. We sampled the above-ground biomass of the plant communities in 129,100 m(2) plots and estimated the community weighted mean (functional ide...
Climate change effects on nitrogen loading from cultivated catchments in Europe: implications for nitrogen retention, ecological state of lakes and adaptation
Jeppesen,Jeppesen, Erik,Erik; Kronvang, Brian; Olesen, Jorgen E.; Audet, Joachim; Sondergaard, Martin; Hoffmann, Carl C.; Andersen, Hans E.; Lauridsen, Torben L.; Liboriussen, Lone; Larsen, Soren E.; Beklioglu, Meryem; Meerhoff,Meerhoff, Mariana,Mariana; Özen, Arda; Özkan, Korhan (2011-03-01)
Climate change might have profound effects on the nitrogen (N) dynamics in the cultivated landscape as well as on N transport in streams and the eutrophication of lakes. N loading from land to streams is expected to increase in North European temperate lakes due to higher winter rainfall and changes in cropping patterns. Scenario (IPCC, A2) analyses using a number of models of various complexity for Danish streams and lakes suggest an increase in runoff and N transport on an annual basis (higher during wint...
Present and historical landscape structure shapes current species richness in Central European grasslands
Scherreiks, Pascal; Gossner, Martin M.; Ayasse, Manfred; Bluethgen, Nico; Fischer, Markus; Klaus, Valentin H.; Kleinebecker, Till; Neff, Felix; Prati, Daniel; Seibold, Sebastian; Simons, Nadja K.; Weisser, Wolfgang W.; Wells, Konstans; Westphal, Catrin; Thiele, Jan; Ambarlı, Didem (2022-03-01)
Context Current diversity and species composition of ecological communities can often not exclusively be explained by present land use and landscape structure. Historical land use may have considerably influenced ecosystems and their properties for decades and centuries. Objectives We analysed the effects of present and historical landscape structure on plant and arthropod species richness in temperate grasslands, using data from comprehensive plant and arthropod assessments across three regions in Germany ...
Strong population structure in a species manipulated by humans since the Neolithic: the European fallow deer (Dama dama dama)
Baker, K. H.; Gray, H. W. I.; Ramovs, V.; Mertzanidou, D.; AKIN PEKŞEN, Çiğdem; Bilgin, Cemal Can; Sykes, N.; Hoelzel, A. R. (2017-07-01)
Species that have been translocated and otherwise manipulated by humans may show patterns of population structure that reflect those interactions. At the same time, natural processes shape populations, including behavioural characteristics like dispersal potential and breeding system. In Europe, a key factor is the geography and history of climate change through the Pleistocene. During glacial maxima throughout that period, species in Europe with temperate distributions were forced south, becoming distribut...
Abiotic and biotic drivers of temporal dynamics in the spatial heterogeneity of zooplankton communities across lakes in recovery from eutrophication
Fu, Hui; Özkan, Korhan; Yuan, Guixiang; Johansson, Liselotte Sander; Søndergaard, Martin; Lauridsen, Torben L.; Jeppesen, Erik (2021-07-15)
Seasonal and annual dynamics of the zooplankton community in lakes are affected by changes in abiotic drivers, trophic interactions (e.g., changes in phytoplankton and fish communities and abundances) and habitat characteristics (e.g. macrophyte abundance and composition). However, little is known about the temporal responses of the zooplankton community to abiotic and biotic drivers across lakes at the regional scale. Using a comprehensive 20-year dataset from 20 Danish lakes in recovery from eutrophicatio...
Citation Formats
K. Özkan and E. Jeppesen, “Environmental species sorting dominates forest-bird community assembly across scales,” JOURNAL OF ANIMAL ECOLOGY, pp. 266–274, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30884.