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Higher β‐ and γ‐diversity at species and genetic levels in headwaters than in mid‐order streams in H ydropsyche ( T richoptera)
Author(s) -
Múrria Cesc,
Bonada Núria,
Arnedo Miquel A.,
Prat Narcís,
Vogler Alfried P.
Publication year - 2013
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/fwb.12204
Subject(s) - genetic diversity , intraspecific competition , biology , ecology , biological dispersal , habitat , lineage (genetic) , species diversity , population , gene , demography , sociology , biochemistry
SummaryThe influence of local habitat characteristics and landscape barriers on the distribution of species and genetic diversity remains poorly known. We tested for differences in turnover and total diversity in aquatic insect assemblages among headwater and mid‐order reaches, two habitats presumably differing in their connectivity between catchments. The genus H ydropsyche (Trichoptera) includes 17 species in the eastern I berian P eninsula and northern M orocco. Cytochrome c oxidase subunit I ( cox1 ) gene was sequenced for H ydropsyche assemblages at 38 headwater sites and 12 mid‐order sites. Local species and intraspecific genetic diversity and differentiation among populations were measured. A total of 231 cox1 sequences resulted in 83 unique haplotypes that clustered into 19 genetic species entities. We find that α‐diversity did not differ between headwater and mid‐order habitats at species and genetic levels, but total species numbers and intraspecific genetic diversity (γ‐diversity) were higher for headwater than for mid‐order or lowland clades, due to greater turnover among sites (β‐diversity). The study revealed lineage‐specific evolutionary responses to different river zones, presumably because of differences in the strength of landscape barriers. The multispecies community genetic approach provides a comprehensive picture of diversity patterns in H ydropsyche , as it links habitat heterogeneity and dispersal limitations to genetic structure and lineage diversification.