Batáry, Péter

[["dc.bibliographiccitation.firstpage","387"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Applied Ecology"],["dc.bibliographiccitation.lastpage","394"],["dc.bibliographiccitation.volume","50"],["dc.contributor.author","Rösch, Verena"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Scherber, Christoph"],["dc.contributor.author","Batáry, Péter"],["dc.contributor.editor","Osborne, Juliet"],["dc.date.accessioned","2017-09-07T11:50:01Z"],["dc.date.available","2017-09-07T11:50:01Z"],["dc.date.issued","2013"],["dc.description.abstract","Calcareous grasslands are among the most species-rich habitats in Europe, but are increasingly threatened due to abandonment and fragmentation. Little is known about how the surrounding landscape influences fragmentation effects. Here, we focus on the interaction between habitat fragmentation and landscape composition on leafhoppers, a highly diverse group of insects, including many species that are likely to be vulnerable to changes in their environment. We selected 14 small and 14 large fragments of calcareous grassland in Central Germany, differing in isolation from other calcareous grasslands and in composition of the surrounding landscape. Leafhoppers, sampled by sweep netting, were either specialists that depended on calcareous grasslands or generalists that could use the landscape matrix, but still required low-productivity habitats. Increasing habitat isolation reduced leafhopper species richness in simple (dominated by arable crops), but not in complex landscapes. This effect was driven by the generalist species. In simple landscapes, leafhoppers may find it more difficult to reach the next suitable fragment due to a lack of alternative resources during dispersal. Moreover, we found that generalist species richness increased with increasing connectivity on small fragments, whereas it remained stable with increasing connectivity on large fragments. In small, isolated fragments, a higher extinction rate combined with a lower probability of recolonization is thought to cause the reduced species richness. Synthesis and applications. Our results show for the first time that insect species richness can be negatively affected by increasing habitat isolation in simplified but not in complex landscapes and in small but not in large fragments. We provide evidence that mitigating the negative effects of habitat fragmentation needs to take the surrounding landscape into account. Management efforts should prioritize (i) an increase in connectivity of small, isolated fragments, (ii) an increase in connectivity of fragments in simple landscapes and (iii) enhanced dispersal by increasing heterogeneity of both landscape composition and configuration. Moreover, extensive management of fragments by grazing or mowing to increase local habitat quality for leafhoppers would benefit other insect groups as well."],["dc.identifier.doi","10.1111/1365-2664.12056"],["dc.identifier.gro","3149819"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6519"],["dc.language.iso","en"],["dc.notes.status","public"],["dc.relation.issn","0021-8901"],["dc.subject","Auchenorrhyncha; connectivity ;generalists; Germany; herbivores; isolation; leafhoppers; landscape context; matrix; specialists"],["dc.title","Landscape composition, connectivity and fragment size drive effects of grassland fragmentation on insect communities"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","505"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Applied Ecology"],["dc.bibliographiccitation.lastpage","513"],["dc.bibliographiccitation.volume","51"],["dc.contributor.author","Haenke, Sebastian"],["dc.contributor.author","Kovács-Hostyánszki, Anikó"],["dc.contributor.author","Fründ, Jochen"],["dc.contributor.author","Batáry, Péter"],["dc.contributor.author","Jauker, Birgit"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Holzschuh, Andrea"],["dc.contributor.editor","Osborne, Juliet"],["dc.date.accessioned","2017-09-07T11:50:42Z"],["dc.date.available","2017-09-07T11:50:42Z"],["dc.date.issued","2014"],["dc.description.abstract","Human-dominated landscapes are characterized by a mosaic of natural and managed ecosystems, affecting arthropod communities on different spatial scales. Effective landscape management for functionally important organisms suffers from little understanding of organism spillover between semi-natural habitats and adjacent crops, and of how it is affected by the surrounding landscape. We examined syrphid abundance (Diptera: Syrphidae) in three types of linear semi-natural habitats, differing in connectedness to annual crops and forest [forest edges (n = 12), forest-connected hedges (n = 11) and isolated hedges (n = 12)], as well as in the adjacent oilseed rape or winter wheat fields (i.e. altogether n = 70 sites in 35 landscapes). The landscape circles with 1 km radius around the study sites differed in the proportion of oilseed rape (ranging from 0% to 35% oilseed rape) enabling us to test landscape-scale effects of oilseed rape. Aphidophagous syrphids were more abundant in forest-connected hedgerows than in forest edges (with isolated hedges being intermediate), and more abundant in crop fields adjacent to hedgerows than adjacent to forest edges, indicating spillover from semi-natural habitats to the adjacent crop fields. Aphidophagous syrphid abundance was higher in semi-natural habitats adjacent to oilseed rape fields than adjacent to wheat fields if the proportion of oilseed rape in the landscape was low (indicating local concentration). Synthesis and applications. This study highlights the potential of hedgerows to enhance the abundances of beneficial syrphids and their spillover to adjacent crop fields, especially when they are connected with forests. We provide evidence that this local exchange is moderated by the extent of mass-flowering crops in the surrounding landscapes due to local concentration. Therefore, measurements for the improvement in local biological functioning should be evaluated by simultaneously investigating local and regional aspects of crop configurations to allow for region-specific management recommendations. Increasing the total amount of hedgerows in the agricultural matrix under moderate landscape-scale proportions of mass-flowering crops may serve best for the conservation of biodiversity and augmentation of important ecosystem services such as biological control and pollination in landscapes dominated by agricultural cultivations."],["dc.identifier.doi","10.1111/1365-2664.12221"],["dc.identifier.gro","3149873"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6580"],["dc.language.iso","en"],["dc.notes.status","public"],["dc.relation.issn","0021-8901"],["dc.title","Landscape configuration of crops and hedgerows drives local syrphid fly abundance"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","no"],["dspace.entity.type","Publication"]]