Schiele, Susanne

[["dc.bibliographiccitation.firstpage","609"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Forest Ecology and Management"],["dc.bibliographiccitation.lastpage","615"],["dc.bibliographiccitation.volume","258"],["dc.contributor.author","Sobek, Stephanie"],["dc.contributor.author","Tscharntke, Teja"],["dc.contributor.author","Scherber, Christoph"],["dc.contributor.author","Schiele, Susanne"],["dc.contributor.author","Steffan-Dewenter, Ingolf"],["dc.date.accessioned","2017-09-07T11:53:59Z"],["dc.date.available","2017-09-07T11:53:59Z"],["dc.date.issued","2009"],["dc.identifier.doi","10.1016/j.foreco.2009.04.026"],["dc.identifier.gro","3150043"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/6767"],["dc.language.iso","en"],["dc.notes.status","zu prüfen"],["dc.relation.issn","0378-1127"],["dc.title","Canopy vs. understory: Does tree diversity affect bee and wasp communities and their natural enemies across forest strata?"],["dc.type","journal_article"],["dc.type.internalPublication","unknown"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1375"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Ecology"],["dc.bibliographiccitation.lastpage","1387"],["dc.bibliographiccitation.volume","89"],["dc.contributor.author","Steffan-Dewenter, Ingolf D."],["dc.contributor.author","Schiele, Susanne"],["dc.date.accessioned","2018-11-07T11:15:26Z"],["dc.date.available","2018-11-07T11:15:26Z"],["dc.date.issued","2008"],["dc.description.abstract","The relative importance of bottom-up or top-down forces has been mainly studied for herbivores but rarely for pollinators. Habitat fragmentation might change driving forces of population dynamics by reducing the area of resource-providing habitats, disrupting habitat connectivity, and affecting natural enemies more than their host species. We studied spatial and temporal population dynamics of the solitary bee Osmia rufa (Hymenoptera: Megachilidae) in 30 fragmented orchard meadows ranging in size from 0.08 to 5.8 ha in an agricultural landscape in central Germany. From 1998 to 2003, we monitored local bee population size, rate of parasitism, and rate of larval and pupal mortality in reed trap nests as an accessible and standardized nesting resource. Experimentally enhanced nest site availability resulted in a steady increase of mean local population size from 80 to 2740 brood cells between 1998 and 2002. Population size and species richness of natural enemies increased with habitat area, whereas rate of parasitism and mortality only varied among years. Inverse density-dependent parasitism in three study years with highest population size suggests rather destabilizing instead of regulating effects of top-down forces. Accordingly, an analysis of independent time series showed on average a negative impact of population size on population growth rates but provides no support for top-down regulation by natural enemies. We conclude that population dynamics of O. rufa are mainly driven by bottom-up forces, primarily nest site availability."],["dc.identifier.doi","10.1890/06-1323.1"],["dc.identifier.isi","000256101200020"],["dc.identifier.pmid","18543630"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54365"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Ecological Soc Amer"],["dc.relation.issn","1939-9170"],["dc.relation.issn","0012-9658"],["dc.title","Do resources or natural enemies drive bee population dynamics in fragmented habitats?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","123"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Entomologia Generalis"],["dc.bibliographiccitation.lastpage","132"],["dc.bibliographiccitation.volume","27"],["dc.contributor.author","Steffan-Dewenter, Ingolf D."],["dc.contributor.author","Schiele, S."],["dc.date.accessioned","2018-11-07T10:52:22Z"],["dc.date.available","2018-11-07T10:52:22Z"],["dc.date.issued","2004"],["dc.description.abstract","Mark-recapture experiments were used to examine nest-site fidelity, natural local population size and effects of body weight on dispersal strategies in the solitary bee Osmia rufa Linnaeus 1758. A total of 974 hibernated females was individually marked and weighed inside their cocoons and then released in five orchard meadows for emergence. In May 2002. colonisation of three spatially separated trap nest locations on each study site (mean distance 52 m) by marked and unmarked females of O. rufa was monitored. Only 222 (22.8 %) of all marked females (3-108 per site) were re-observed. Mortality rates varied between 2.2 and 26.4 % between study sites. Thus estimated 74 %, of emerged females leaved the parental nest-site. The number of observed unmarked females varied between 9 and 16 per-site resulting in an estimated natural Population size between 48 and 258 individuals or 15 females per 1000 m(2) on average. The mean body weight of marked recaptured females (113.0 +/- 14.9 mg) was significantly higher than the body weight of marked but not recaptured females(107.3 +/- 19.0 mg). The results give new insights into the possible densities of natural populations of a solitary bee species, its nest-site fidelity and the potential role of body weight for dispersal strategies."],["dc.identifier.isi","000226410500004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49100"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","E Schweizerbartsche Verlags"],["dc.relation.issn","0171-8177"],["dc.title","Nest-site fidelity, body weight and population size of the red mason bee, Osmia rufa (Hymenoptera : Megachilidae), evaluated by Mark-Recapture experiments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]