The winners and losers of land use intensification: pollinator community disassembly is non-random and alters functional diversity

Authors

  • Romina Rader,

    Corresponding author
    1. Ecosystem Management, School of Environment and Rural Sciences, University of New England, Armidale, NSW, Australia
    2. School of Marine and Tropical Biology, James Cook University, Cairns, Qld, Australia
    3. The New Zealand Institute for Plant & Food Research Limited, Christchurch, New Zealand
    • Correspondence: Romina Rader, Ecosystem Management, University of New England, Armidale 2350, NSW, Australia.

      E-mail: RominaRader@gmail.com

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  • Ignasi Bartomeus,

    1. Estación Biológica de Doñana (EBD-CSIC), Sevilla, Spain
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  • Jason M. Tylianakis,

    1. School of Biological Sciences, University of Canterbury, Christchurch, New Zealand
    2. Department of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, Berkshire, UK
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  • Etienne Laliberté

    1. School of Plant Biology, The University of Western Australia, Crawley (Perth), WA, Australia
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Abstract

Aim

Pollination services are at risk from land use change and intensification, but responses of individual pollinator species are often variable, making it difficult to detect and understand community-level impacts on pollination. We investigated changes in community composition and functional diversity of insect pollinator communities under land use change in a highly modified landscape.

Location

Canterbury region, South Island, New Zealand.

Methods

We trapped insect pollinators every month for 1 year at 24 sites across four land use types of increasing intensity in New Zealand: gardens with native vegetation, blackcurrant orchards, dairy farms, and rotational cropping farms. We investigated changes in pollinator species and functional richness and differences in species and functional composition.

Results

Under increasing land use intensity, both species and functional richness declined markedly. Changes in functional richness, however, were overall not significantly different than expected based on the observed declines in species richness. Nevertheless, there was a significant trend towards greater than expected functional richness within less-intensive land use types and lower than expected functional richness within intensive land use types. The order of species loss under increasing land use intensity was non-random, as pollinators with a narrow diet breadth, large body size, solitary behaviour and a preference for non-floral larval food resources were lost first.

Main conclusions

Our study shows that pollinator species bearing particular trait attributes are susceptible to differences in land use. Our study suggests that pollination services may be more vulnerable to environmental changes and disturbances in more intensive land use types as a result of lower pollinator functional richness.

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