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Title

Impact of past climatic changes and resource availability on the population demography of three food-specialist bees

Publication Year

2015

Author(s)
  • Dellicour, Simon
  • Michez, Denis
  • Rasplus, Jean-Yves
  • Mardulyn, Patrick
Source
MOLECULAR ECOLOGY Volume: 24 Issue: 5 Pages: 1074-1090 Published: 2015
ISSN
0962-1083 eISSN: 1365-294X
Abstract

Past climate change is known to have strongly impacted current patterns of genetic variation of animals and plants in Europe. However, ecological factors also have the potential to influence demographic history and thus patterns of genetic variation. In this study, we investigated the impact of past climate, and also the potential impact of host plant species abundance, on intraspecific genetic variation in three codistributed and related specialized solitary bees of the genus Melitta with very similar life history traits and dispersal capacities. We sequenced five independent loci in samples collected from the three species. Our analyses revealed that the species associated with the most abundant host plant species (Melitta leporina) displays unusually high genetic variation, to an extent that is seldom reported in phylogeographic studies of animals and plants. This suggests a potential role of food resource abundance in determining current patterns of genetic variation in specialized herbivorous insects. Patterns of genetic variation in the two other species indicated lower overall levels of diversity, and that M.nigricans could have experienced a recent range expansion. Ecological niche modelling of the three Melitta species and their main host plant species suggested a strong reduction in range size during the last glacial maximum. Comparing observed sequence data with data simulated using spatially explicit models of coalescence suggests that M.leporina recovered a range and population size close to their current levels at the end of the last glaciation, and confirms recent range expansion as the most likely scenario for M.nigricans. Overall, this study illustrates that both demographic history and ecological factors may have contributed to shape current phylogeographic patterns.

Author Keyword(s)
  • coalescent simulations
  • demographic history
  • food specialization
  • intraspecific diversity
  • phylogeography
  • phytophagous insects
  • population fragmentation
KeyWord(s) Plus
  • Y-CHROMOSOME DISTRIBUTIONS
  • CENTRAL-ASIAN PASTORALISTS
  • DNA-SEQUENCES
  • GENETIC DIFFERENTIATION
  • NUCLEAR GENES
  • COMPARATIVE PHYLOGEOGRAPHY
  • HYMENOPTERA COLLETIDAE
  • RECOMBINANT SEQUENCES
  • BALANCING SELECTION
  • MOSAIC STRUCTURE
ESI Discipline(s)
  • Biology & Biochemistry
  • Environment/Ecology
  • Molecular Biology & Genetics
  • Plant & Animal Science
Web of Science Category(ies)
  • Biochemistry & Molecular Biology
  • Ecology
  • Evolutionary Biology
Adress(es)

[Dellicour, Simon; Mardulyn, Patrick] Univ Libre Bruxelles, Evolutionary Biol & Ecol, B-1050 Brussels, Belgium; [Michez, Denis] Univ Mons, Res Inst Biosci, Zool Lab, B-7000 Mons, Belgium; [Rasplus, Jean-Yves] Montpellier SupAgro, Cirad, IRD, UMR CBGP,INRA, Montferrier Sur Lez, France

Reprint Adress

Dellicour, S (reprint author), Univ Oxford, Dept Zool, S Parks Rd, Oxford OX1 3PS, England.

Country(ies)
  • Belgium
  • France
  • United Kingdom
CNRS - Adress(es)

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Accession Number
WOS:000350246500010
uid:/GV9RS9ZG
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