Maas, Bea

[["dc.bibliographiccitation.firstpage","2665"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Biological Conservation"],["dc.bibliographiccitation.lastpage","2671"],["dc.bibliographiccitation.volume","142"],["dc.contributor.author","Maas, Bea"],["dc.contributor.author","Putra, Dadang Dwi"],["dc.contributor.author","Waltert, Matthias"],["dc.contributor.author","Clough, Yann"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Schulze, Christian H."],["dc.date.accessioned","2017-09-07T11:53:56Z"],["dc.date.available","2017-09-07T11:53:56Z"],["dc.date.issued","2009"],["dc.description.abstract","Studies on temporal changes of tropical bird communities in response to habitat modification are rare. We quantified changes in bird assemblages at the rainforest margin of Lore Lindu National Park, Central Sulawesi, over an interval of 6 years. Standardized bird counts were conducted in the years 2001/2002 and 2008 at 15 census points representing natural forest, secondary forest, agroforest and openland sites. Although overall species richness remained nearly identical, different species groups were affected unequally by habitat modification within the forest margin landscape. The mostly endemic forest species declined in abundance (72.0% of forest species) and were detected at fewer census points in 2008 (56.0%). In contrast, 81.8% of the solely widespread openland birds became more abundant and 63.6% of the species were recorded at a larger number of census points. Hence, recent human activities in the forest margin ecotone negatively affected species of high conservation value. Species richness turned out to be a poor indicator of habitat change, and our results underline the importance of considering species identities. Biotic homogenization as result of habitat conversion is a global phenomenon. In our study, the winners were widespread openland species, while the losers were endemic forest birds. In conclusion, our study shows that 6 years of land-use change had negative impacts on bird community structure and endangered species, but not on overall bird species richness."],["dc.identifier.doi","10.1016/j.biocon.2009.06.018"],["dc.identifier.gro","3150026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6748"],["dc.language.iso","en"],["dc.notes.status","public"],["dc.relation.issn","0006-3207"],["dc.subject","Biotic homogenization; Sulawesi; Deforestation; Land-use change; Temporal dynamics"],["dc.title","Six years of habitat modification in a tropical rainforest margin of Indonesia do not affect bird diversity but endemic forest species"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","735"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Applied Ecology"],["dc.bibliographiccitation.lastpage","743"],["dc.bibliographiccitation.volume","52"],["dc.contributor.author","Maas, Bea"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Saleh, Shahabuddin"],["dc.contributor.author","Dwi Putra, Dadang"],["dc.contributor.author","Clough, Yann"],["dc.contributor.editor","Siriwardena, Gavin"],["dc.date.accessioned","2017-09-07T11:50:03Z"],["dc.date.available","2017-09-07T11:50:03Z"],["dc.date.issued","2015"],["dc.identifier.doi","10.1111/1365-2664.12409"],["dc.identifier.gro","3149829"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6530"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0021-8901"],["dc.title","Avian species identity drives predation success in tropical cacao agroforestry"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1480"],["dc.bibliographiccitation.issue","12"],["dc.bibliographiccitation.journal","Ecology Letters"],["dc.bibliographiccitation.lastpage","1487"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Maas, Bea"],["dc.contributor.author","Clough, Yann"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.editor","Courchamp, Franck"],["dc.date.accessioned","2017-09-07T11:50:00Z"],["dc.date.available","2017-09-07T11:50:00Z"],["dc.date.issued","2013"],["dc.identifier.doi","10.1111/ele.12194"],["dc.identifier.gro","3149821"],["dc.identifier.pmid","24131776"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6522"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","1461-023X"],["dc.title","Bats and birds increase crop yield in tropical agroforestry landscapes"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","953"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Applied Ecology"],["dc.bibliographiccitation.lastpage","963"],["dc.bibliographiccitation.volume","53"],["dc.contributor.author","Gras, Pierre"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Maas, Bea"],["dc.contributor.author","Tjoa, Aiyen"],["dc.contributor.author","Hafsah, Awal"],["dc.contributor.author","Clough, Yann"],["dc.date.accessioned","2017-09-07T11:53:49Z"],["dc.date.available","2017-09-07T11:53:49Z"],["dc.date.issued","2016"],["dc.description.abstract","Tropical agroforests are diverse systems where several predator groups shape animal communities and plant–arthropod interactions. Ants, birds and bats in particular can reduce herbivore numbers and thereby increase crop yield. However, the relative importance of these groups, whether they interact, and how this interaction is affected by management and landscape context, is poorly understood. We jointly manipulated access of ants, birds and bats in Indonesian smallholder cacao agroforestry across gradients of shade and distance to natural forest. We quantified arthropod abundance, pest damage and yield. In control treatments, yield was highest under 30–40% canopy cover. Ant exclusion strongly reduced yield (from 600 to 300 kg ha−1 year−1) at 15% canopy cover. Bird exclusion impaired yield (from 400 to 250 kg ha−1 year−1) at 60% and enhanced yield (from 600 to 900 kg ha−1 year−1) at 15% canopy cover, while bats had no effect. Yield increased with forest proximity, a pattern not related to predator access. No interactive effects among predator exclusions on yield, pest damage and arthropod communities were found. Ant exclusion increased numbers of herbivores below 30% canopy cover, without reducing spider abundances. Bird exclusion reduced herbivore and increased spider abundances. Synthesis and applications. Using exclusion studies, we estimated that ants and birds cause cacao yield to vary between 100 and 800 kg ha−1 year−1, depending on shade-tree management. In all but the most shaded agroforests, ants were pivotal in supporting yields. Yields under low-canopy cover were strongly dependent on access by predator groups, with birds reducing rather than increasing yield. Hence, cacao farmers should refrain from disturbing ant communities and maintain 30–40% shade-tree canopy cover not only for ecophysiological reasons but also to buffer variability in predator communities."],["dc.identifier.doi","10.1111/1365-2664.12625"],["dc.identifier.gro","3149979"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6696"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.issn","0021-8901"],["dc.subject","agricultural intensification; biocontrol; canopy cover; ecosystem services; forest distance; mesopredator release; predation; Theobroma cacao; trophic interactions; yield"],["dc.title","How ants, birds and bats affect crop yield along shade gradients in tropical cacao agroforestry"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]