Scale dependent drivers of wild bee diversity in tropical heterogeneous agricultural landscapes

P. Basu, A.K. Parui, S. Chatterjee, A. Dutta, P. Chakraborty, S. Roberts, Barbara M. Smith

Research output: Contribution to journalArticle

8 Citations (Scopus)
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Abstract

Factors associated with agricultural intensification, for example, loss of seminatural vegetation and pesticide use has been shown to adversely affect the bee community. These factors may impact the bee community differently at different landscape scales. The scale dependency is expected to be more pronounced in heterogeneous landscapes. However, the scale-dependent response of the bee community to drivers of its decline is relatively understudied, especially in the tropics where the agricultural landscape is often heterogeneous. This study looked at effects of agricultural intensification on bee diversity at patch and landscape scales in a tropical agricultural landscape. Wild bees were sampled using 12 permanent pan trap stations. Patch and landscape characteristics were measured within a 100 m (patch scale) and a 500 m (landscape scale) radius of pan trap stations. Information on pesticide input was obtained from farmer surveys. Data on vegetation cover, productivity, and percentage of agricultural and fallow land (FL) were collected using satellite imagery. Intensive areas in a bee-site network were less specialized in terms of resources to attract rare bee species while the less intensive areas, which supported more rare species, were more vulnerable to disturbance. A combination of patch quality and diversity as well as pesticide use regulates species diversity at the landscape scale (500 m), whereas pesticide quantity drove diversity at the patch scale (100 m). At the landscape scale, specialization of each site in terms of resources for bees increased with increasing patch diversity and FL while at the patch scale specialization declined with increased pesticide use. Bee functional groups responded differentially to landscape characteristics as well as pesticide use. Wood nesting bees were negatively affected by the number of pesticides used but other bee functional groups were not sensitive to pesticides. Synthesis and Applications: Different factors affect wild bee diversity at the scale of landscape and patch in heterogeneous tropical agricultural systems. The differential response of bee functional groups to agricultural intensification underpins the need for guild-specific management strategies for wild bee conservation. Less intensively farmed areas support more rare species and are vulnerable to disturbance; consequently, these areas should be prioritized for conservation to maintain heterogeneity in the landscape. It is important to conserve and restore seminatural habitats to maintain complexity in the landscapes through participatory processes and to regulate synthetic chemical pesticides in farm operations to conserve the species and functional diversity of wild bees.
Original languageEnglish
Pages (from-to)6983–6992
JournalEcology and Evolution
Volume6
Issue number19
Early online date9 Sep 2016
DOIs
Publication statusPublished - 4 Oct 2016

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bee
Apoidea
agricultural land
pesticide
pesticides
agricultural intensification
functional group
rare species
fallow
traps
disturbance
species diversity
resource
functional diversity
guild
farming system
satellite imagery
vegetation cover
tropics
farm

Bibliographical note

This is an open access article
This is an open access article under the terms of the Creative Commons Attribution License, which permits use,
distribution and reproduction in any medium, provided the original work is properly cited.

Keywords

  • Agricultural intensification
  • diversity
  • India
  • pesticide
  • scale
  • seminatural habitats
  • Wild
  • bees.

Cite this

Basu, P., Parui, A. K., Chatterjee, S., Dutta, A., Chakraborty, P., Roberts, S., & Smith, B. M. (2016). Scale dependent drivers of wild bee diversity in tropical heterogeneous agricultural landscapes. Ecology and Evolution, 6(19), 6983–6992. https://doi.org/10.1002/ece3.2360

Scale dependent drivers of wild bee diversity in tropical heterogeneous agricultural landscapes. / Basu, P.; Parui, A.K.; Chatterjee, S.; Dutta, A.; Chakraborty, P.; Roberts, S.; Smith, Barbara M.

In: Ecology and Evolution, Vol. 6, No. 19, 04.10.2016, p. 6983–6992.

Research output: Contribution to journalArticle

Basu, P, Parui, AK, Chatterjee, S, Dutta, A, Chakraborty, P, Roberts, S & Smith, BM 2016, 'Scale dependent drivers of wild bee diversity in tropical heterogeneous agricultural landscapes' Ecology and Evolution, vol. 6, no. 19, pp. 6983–6992. https://doi.org/10.1002/ece3.2360
Basu P, Parui AK, Chatterjee S, Dutta A, Chakraborty P, Roberts S et al. Scale dependent drivers of wild bee diversity in tropical heterogeneous agricultural landscapes. Ecology and Evolution. 2016 Oct 4;6(19):6983–6992. https://doi.org/10.1002/ece3.2360
Basu, P. ; Parui, A.K. ; Chatterjee, S. ; Dutta, A. ; Chakraborty, P. ; Roberts, S. ; Smith, Barbara M. / Scale dependent drivers of wild bee diversity in tropical heterogeneous agricultural landscapes. In: Ecology and Evolution. 2016 ; Vol. 6, No. 19. pp. 6983–6992.
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