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Fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape

Land-use changes have threatened populations of many insect pollinators, including bumble bees. Patterns of dispersal and gene flow are key determinants of species' ability to respond to land-use change, but have been little investigated at a fine scale (<10 km) in bumble bees. Using microsa...

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Autores principales: Dreier, Stephanie, Redhead, John W, Warren, Ian A, Bourke, Andrew F G, Heard, Matthew S, Jordan, William C, Sumner, Seirian, Wang, Jinliang, Carvell, Claire
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Blackwell Publishing Ltd 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4142012/
https://www.ncbi.nlm.nih.gov/pubmed/24980963
http://dx.doi.org/10.1111/mec.12823
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author Dreier, Stephanie
Redhead, John W
Warren, Ian A
Bourke, Andrew F G
Heard, Matthew S
Jordan, William C
Sumner, Seirian
Wang, Jinliang
Carvell, Claire
author_facet Dreier, Stephanie
Redhead, John W
Warren, Ian A
Bourke, Andrew F G
Heard, Matthew S
Jordan, William C
Sumner, Seirian
Wang, Jinliang
Carvell, Claire
author_sort Dreier, Stephanie
collection PubMed
description Land-use changes have threatened populations of many insect pollinators, including bumble bees. Patterns of dispersal and gene flow are key determinants of species' ability to respond to land-use change, but have been little investigated at a fine scale (<10 km) in bumble bees. Using microsatellite markers, we determined the fine-scale spatial genetic structure of populations of four common Bombus species (B. terrestris, B. lapidarius, B. pascuorum and B. hortorum) and one declining species (B. ruderatus) in an agricultural landscape in Southern England, UK. The study landscape contained sown flower patches representing agri-environment options for pollinators. We found that, as expected, the B. ruderatus population was characterized by relatively low heterozygosity, number of alleles and colony density. Across all species, inbreeding was absent or present but weak (F(IS) = 0.01–0.02). Using queen genotypes reconstructed from worker sibships and colony locations estimated from the positions of workers within these sibships, we found that significant isolation by distance was absent in B. lapidarius, B. hortorum and B. ruderatus. In B. terrestris and B. pascuorum, it was present but weak; for example, in these two species, expected relatedness of queens founding colonies 1 m apart was 0.02. These results show that bumble bee populations exhibit low levels of spatial genetic structure at fine spatial scales, most likely because of ongoing gene flow via widespread queen dispersal. In addition, the results demonstrate the potential for agri-environment scheme conservation measures to facilitate fine-scale gene flow by creating a more even distribution of suitable habitats across landscapes.
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spelling pubmed-41420122014-09-08 Fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape Dreier, Stephanie Redhead, John W Warren, Ian A Bourke, Andrew F G Heard, Matthew S Jordan, William C Sumner, Seirian Wang, Jinliang Carvell, Claire Mol Ecol Original Articles Land-use changes have threatened populations of many insect pollinators, including bumble bees. Patterns of dispersal and gene flow are key determinants of species' ability to respond to land-use change, but have been little investigated at a fine scale (<10 km) in bumble bees. Using microsatellite markers, we determined the fine-scale spatial genetic structure of populations of four common Bombus species (B. terrestris, B. lapidarius, B. pascuorum and B. hortorum) and one declining species (B. ruderatus) in an agricultural landscape in Southern England, UK. The study landscape contained sown flower patches representing agri-environment options for pollinators. We found that, as expected, the B. ruderatus population was characterized by relatively low heterozygosity, number of alleles and colony density. Across all species, inbreeding was absent or present but weak (F(IS) = 0.01–0.02). Using queen genotypes reconstructed from worker sibships and colony locations estimated from the positions of workers within these sibships, we found that significant isolation by distance was absent in B. lapidarius, B. hortorum and B. ruderatus. In B. terrestris and B. pascuorum, it was present but weak; for example, in these two species, expected relatedness of queens founding colonies 1 m apart was 0.02. These results show that bumble bee populations exhibit low levels of spatial genetic structure at fine spatial scales, most likely because of ongoing gene flow via widespread queen dispersal. In addition, the results demonstrate the potential for agri-environment scheme conservation measures to facilitate fine-scale gene flow by creating a more even distribution of suitable habitats across landscapes. Blackwell Publishing Ltd 2014-07 2014-06-30 /pmc/articles/PMC4142012/ /pubmed/24980963 http://dx.doi.org/10.1111/mec.12823 Text en © 2014 The Authors. Molecular Ecology Published by John Wiley & Sons Ltd. http://creativecommons.org/licenses/by/3.0/ 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.
spellingShingle Original Articles
Dreier, Stephanie
Redhead, John W
Warren, Ian A
Bourke, Andrew F G
Heard, Matthew S
Jordan, William C
Sumner, Seirian
Wang, Jinliang
Carvell, Claire
Fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape
title Fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape
title_full Fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape
title_fullStr Fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape
title_full_unstemmed Fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape
title_short Fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape
title_sort fine-scale spatial genetic structure of common and declining bumble bees across an agricultural landscape
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4142012/
https://www.ncbi.nlm.nih.gov/pubmed/24980963
http://dx.doi.org/10.1111/mec.12823
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