caa a22 4500 605526419 CHVBK 20210128100803.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10531-015-0865-0 doi (NATIONALLICENCE)springer-10.1007/s10531-015-0865-0 Impacts of habitat degradation and stream spatial location on biodiversity in a disturbed riverine landscape [Elektronische Daten] [Emma Göthe, Peter Wiberg-Larsen, Esben Kristensen, Annette Baattrup-Pedersen, Leonard Sandin, Nikolai Friberg] The ongoing degradation of freshwater habitat quality and subsequent losses of biodiversity is alarming. One key to successful freshwater management is to understand how different scale-dependent diversity components (i.e. γ-, α- and β-diversity) change along present-day anthropogenic impact gradients. We used macrophyte, fish and macroinvertebrate data from Danish lowland streams to investigate whether (1) high connectivity in reaches situated in lower parts of the stream network (downstream sites) generates high α-diversity, while dispersal limitation and high habitat heterogeneity across the more isolated upper reaches (headwater sites) generate high β-diversity, (2) γ-, α- and β- diversity decrease with increasing hydromorphological impact and (3) high connectivity in downstream reaches buffers against impacts on biodiversity. Results showed that α-diversity was higher in downstream sites, while headwaters did not exhibit greater β-diversity. We observed a significant but relatively small decline in α-diversity with increasing hydromorphological impact, while β-diversity changed more unpredictably along the gradient. There was no clear mitigating effect in downstream reaches as the reduction in diversity from low to high impacted sites was similar between upper and lower reaches. We suggest that the results, which generally contradicted our predictions, partly reflect the intense historic and present land use in the region leading to an isolation of available source communities and a diminished regional species pool. The importance of having a landscape perspective in conservation management in highly impacted regions is emphasised because it is a prerequisite for recolonisation and population stability over time. Springer Science+Business Media Dordrecht, 2015 Macroinvertebrates nationallicence Fish nationallicence Macrophytes nationallicence α-Diversity nationallicence β-Diversity nationallicence γ-Diversity nationallicence Environmental stressors nationallicence Göthe Emma Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut Wiberg-Larsen Peter Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut Kristensen Esben Alectia A/S, Skanderborgvej 190, Viby J, 8260, Aarhus, Denmark aut Baattrup-Pedersen Annette Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut Sandin Leonard Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut Friberg Nikolai Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut Biodiversity and Conservation Springer Netherlands 24/6(2015-06-01), 1423-1441 0960-3115 24:6<1423 2015 24 10531 https://doi.org/10.1007/s10531-015-0865-0 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10531-015-0865-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Göthe Emma Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut NATIONALLICENCE 700 1- Wiberg-Larsen Peter Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut NATIONALLICENCE 700 1- Kristensen Esben Alectia A/S, Skanderborgvej 190, Viby J, 8260, Aarhus, Denmark aut NATIONALLICENCE 700 1- Baattrup-Pedersen Annette Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut NATIONALLICENCE 700 1- Sandin Leonard Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden aut NATIONALLICENCE 700 1- Friberg Nikolai Department of Bioscience, Aarhus University, Vejlsøvej 25, 8600, Silkeborg, Denmark aut NATIONALLICENCE 773 0- Biodiversity and Conservation Springer Netherlands 24/6(2015-06-01), 1423-1441 0960-3115 24:6<1423 2015 24 10531