Kormann, Urs G.

[["dc.bibliographiccitation.firstpage","1288"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Applied Ecology"],["dc.bibliographiccitation.lastpage","1298"],["dc.bibliographiccitation.volume","55"],["dc.contributor.author","Kormann, Urs G."],["dc.contributor.author","Hadley, Adam S."],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Betts, Matthew G."],["dc.contributor.author","Robinson, W. Douglas"],["dc.contributor.author","Scherber, Christoph"],["dc.contributor.editor","Maron, Martine"],["dc.date.accessioned","2019-07-23T08:29:26Z"],["dc.date.available","2019-07-23T08:29:26Z"],["dc.date.issued","2018"],["dc.description.abstract","Tropical conservation strategies traditionally focus on large tracts of pristine forests, but given rapid primary forest decline, understanding the role of secondary forest remnants for biodiversity maintenance is critical. Until now, the interactive effects of changes in forest amount, configuration and disturbance history (secondary vs. primary forest) on the conservation value of tropical landscapes has remained unknown, hampering the incorporation of these global change drivers into local and global conservation planning. 2.We disentangled effects of landscape wide forest amount, fragment size, and forest age (old growth versus secondary forest) on abundance, α-diversity, β-diversity (biotic homogenisation) and community shifts of bird communities in human-dominated landscapes of southern Costa Rica. Utilizing two complementary methods, yielding 6900 individual detections and 223 species, we characterized bird communities in 49 forest fragments representing independent gradients in fragment size (<5 ha vs >30 ha) and forest amount (5%-80%) in the surrounding landscape (within 1000 m). 3.Abundance and α-diversity of forest specialists and insectivores declined by half in small fragments, but only in landscapes with little old growth forest. Conversely, secondary forest at the landscape scale showed no such compensation effect. Similarly, a null-model approach indicated significant biotic homogenisation in small versus large fragments, but only in landscapes with little old growth forest, suggesting forest amount and configuration interactively affect β-diversity in tropical human-dominated landscapes. Finally, dramatic abundance-based community shifts relative to intact forests are largely a result of landscape-scale loss of old growth rather than changes in overall forest cover. 4.Policy implications. Our study provides strong evidence that retaining old growth within tropical human modified landscapes can simultaneously curb erosion of avian forest specialist α-diversity, mitigate collapse of β-diversity (biotic homogenisation) and dampen detrimental avian community shifts. However, secondary forests play, at best, a subordinate role to mitigate these processes. To maintain tropical forest biodiversity, retaining old growth forest within landscapes should be first priority, highlighting a land-sparing approach. This article is protected by copyright. All rights reserved."],["dc.identifier.doi","10.1111/1365-2664.13084"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/61890"],["dc.language.iso","en"],["dc.relation.issn","0021-8901"],["dc.title","Primary rainforest amount at the landscape scale mitigates bird biodiversity loss and biotic homogenization"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","20152347"],["dc.bibliographiccitation.issue","1823"],["dc.bibliographiccitation.journal","Proceedings of The Royal Society B Biological Sciences"],["dc.bibliographiccitation.volume","283"],["dc.contributor.author","Kormann, Urs"],["dc.contributor.author","Scherber, Christoph"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Klein, Nadja"],["dc.contributor.author","Larbig, Manuel"],["dc.contributor.author","Valente, Jonathon J."],["dc.contributor.author","Hadley, Adam S."],["dc.contributor.author","Betts, Matthew G."],["dc.date.accessioned","2018-11-07T10:19:09Z"],["dc.date.available","2018-11-07T10:19:09Z"],["dc.date.issued","2016"],["dc.description.abstract","Tropical biodiversity and associated ecosystem functions have become heavily eroded through habitat loss. Animal-mediated pollination is required in more than 94% of higher tropical plant species and 75% of the world's leading food crops, but it remains unclear if corridors avert deforestation-driven pollination breakdown in fragmented tropical landscapes. Here, we used manipulative resource experiments and field observations to show that corridors functionally connect neotropical forest fragments for forest-associated hummingbirds and increase pollen transfer. Further, corridors boosted forest-associated pollinator availability in fragments by 14.3 times compared with unconnected equivalents, increasing overall pollination success. Plants in patches without corridors showed pollination rates equal to bagged control flowers, indicating pollination failure in isolated fragments. This indicates, for the first time, that corridors benefit tropical forest ecosystems beyond boosting local species richness, by functionally connecting mutualistic network partners. We conclude that small-scale adjustments to landscape configuration safeguard native pollinators and associated pollination services in tropical forest landscapes."],["dc.identifier.doi","10.1098/rspb.2015.2347"],["dc.identifier.isi","000375858400011"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41607"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Royal Soc"],["dc.relation.issn","1471-2954"],["dc.relation.issn","0962-8452"],["dc.title","Corridors restore animal-mediated pollination in fragmented tropical forest landscapes"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]