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Land-use impacts on plant-pollinator networks: interaction strength and specialization predict pollinator declines.

Weiner, Christiane Natalie and Werner, Michael and Linsenmair, Karl Eduard and Blüthgen, Nico (2014):
Land-use impacts on plant-pollinator networks: interaction strength and specialization predict pollinator declines.
In: Ecology, pp. 466-74, 95, (2), ISSN 0012-9658,
[Article]

Abstract

Land use is known to reduce the diversity of species and complexity of biotic interactions. In theory, interaction networks can be used to predict the sensitivity of species against co-extinction, but this has rarely been applied to real ecosystems facing variable land-use impacts. We investigated plant-pollinator networks on 119 grasslands that varied quantitatively in management regime, yielding 25401 visits by 741 pollinator species on 166 plant species. Species-specific plant and pollinator responses to land use were significantly predicted by the weighted average land-use response of each species' partners. Moreover, more specialized pollinators were more vulnerable than generalists. Both predictions are based on the relative interaction strengths provided by the observed interaction network. Losses in flower and pollinator diversity were linked, and mutual dependence between plants and pollinators accelerates the observed parallel declines in response to land-use intensification. Our findings confirm that ecological networks help to predict natural community responses to disturbance and possible secondary extinctions.

Item Type: Article
Erschienen: 2014
Creators: Weiner, Christiane Natalie and Werner, Michael and Linsenmair, Karl Eduard and Blüthgen, Nico
Title: Land-use impacts on plant-pollinator networks: interaction strength and specialization predict pollinator declines.
Language: English
Abstract:

Land use is known to reduce the diversity of species and complexity of biotic interactions. In theory, interaction networks can be used to predict the sensitivity of species against co-extinction, but this has rarely been applied to real ecosystems facing variable land-use impacts. We investigated plant-pollinator networks on 119 grasslands that varied quantitatively in management regime, yielding 25401 visits by 741 pollinator species on 166 plant species. Species-specific plant and pollinator responses to land use were significantly predicted by the weighted average land-use response of each species' partners. Moreover, more specialized pollinators were more vulnerable than generalists. Both predictions are based on the relative interaction strengths provided by the observed interaction network. Losses in flower and pollinator diversity were linked, and mutual dependence between plants and pollinators accelerates the observed parallel declines in response to land-use intensification. Our findings confirm that ecological networks help to predict natural community responses to disturbance and possible secondary extinctions.

Journal or Publication Title: Ecology
Volume: 95
Number: 2
Divisions: 10 Department of Biology
10 Department of Biology > Synthetic Ecological Networks
Date Deposited: 15 Apr 2014 11:13
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