Flowering phenology and nesting resources influence pollinator community composition in a fragmented ecosystem

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• 作者：Julie C. Wray (1)
  Elizabeth Elle (1)
  
  1. Evolutionary and Behavioural Ecology Research Group ; Department of Biological Sciences ; Simon Fraser University ; 8888 University Drive ; Burnaby ; BC ; V5A 1S6 ; Canada
  
• 关键词：Habitat fragmentation ; Oak ; savannah ; Landscape matrix ; Community composition ; Flowering plants ; Nesting resources
• 刊名：Landscape Ecology
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：30
• 期：2
• 页码：261-272
• 全文大小：397 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Landscape Ecology
  Plant Ecology
  Forestry Management
  Forestry
  Ecology
  Plant Sciences
  
• 出版者：Springer Netherlands
• ISSN：1572-9761

文摘

Introduction Habitat loss is the leading cause of extinctions on the planet. However, negative effects of habitat loss and fragmentation on biodiversity can be reduced if resources in urban or semi-natural areas in the surrounding matrix can be used by wildlife. Methods We investigated the influence of floral and nesting resources in urban- and forest-associated oak-savannah fragments, surrounding urban and forest matrix, and urban areas spatially independent from oak-savannah habitat on pollinator community composition in a fragmented oak-savannah ecosystem. Results Both independent urban and urban matrix sites supported high abundance and richness of plants and pollinators relative to other fragment categories, especially towards the end of the season when plants and pollinators in oak-savannah fragments were scarce. A species of particular conservation concern in our region, Bombus occidentalis, was supported by late-flowering resources in our urban sites. Forest-associated oak-savannah fragments were missing late-season species while urban-associated fragments supported high abundance and richness of mid- to late-season pollinators, likely due to supplemental use of floral resources in the urban matrix. Female cavity-nesting and ground-nesting bees were not restricted by the availability of natural nesting resources we expected them to require (e.g. small cavities, bare soil). Conclusion These results provide important information on native pollinators in a highly fragmented habitat, and suggest that we should consider matrix quality in conservation planning.