Changes in adult sex ratio in wild bee communities are linked to urbanization

Wild bees are indispensable pollinators, supporting global agricultural yield and angiosperm biodiversity. They are experiencing widespread declines, resulting from multiple interacting factors. The effects of urbanization, a major driver of ecological change, on bee populations are not well underst...

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Veröffentlicht in:Scientific reports 2019-03, Vol.9 (1), p.3767-3767, Article 3767
Hauptverfasser: Fitch, Gordon, Glaum, Paul, Simao, Maria-Carolina, Vaidya, Chatura, Matthijs, Jill, Iuliano, Benjamin, Perfecto, Ivette
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container_title Scientific reports
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creator Fitch, Gordon
Glaum, Paul
Simao, Maria-Carolina
Vaidya, Chatura
Matthijs, Jill
Iuliano, Benjamin
Perfecto, Ivette
description Wild bees are indispensable pollinators, supporting global agricultural yield and angiosperm biodiversity. They are experiencing widespread declines, resulting from multiple interacting factors. The effects of urbanization, a major driver of ecological change, on bee populations are not well understood. Studies examining the aggregate response of wild bee abundance and diversity to urbanization tend to document minor changes. However, the use of aggregate metrics may mask trends in particular functional groups. We surveyed bee communities along an urban-to-rural gradient in SE Michigan, USA, and document a large change in observed sex ratio (OSR) along this gradient. OSR became more male biased as urbanization increased, mainly driven by a decline in medium and large bodied ground-nesting female bees. Nest site preference and body size mediated the effects of urbanization on OSR. Our results suggest that previously documented negative effects of urbanization on ground-nesting bees may underestimate the full impact of urbanization, and highlight the need for improved understanding of sex-based differences in the provision of pollination services by wild bees.
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subjects 704/158/672
704/158/858
Bees
Biodiversity
Body size
Humanities and Social Sciences
multidisciplinary
Nesting
Place preferences
Plant reproduction
Pollination
Pollinators
Science
Science (multidisciplinary)
Sex ratio
Urbanization
title Changes in adult sex ratio in wild bee communities are linked to urbanization
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