Do xeric landscapes increase genetic divergence in aquatic ecosystems?

E. Perry Thomas, Dean W. Blinn, Paul S Keim

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

1. Previous investigations of the ecological genetics among amphipods in south-western U.S.A. suggested a xeric landscape promoted genetic divergence among passively dispersed freshwater invertebrates, thereby enhancing speciation events. We predicted that less divergence would occur among amphipod populations across similar geographic distances in mesic regions. 2. Eight Hyalella azteca populations were sampled along a 200-km transect in western Oregon, U.S.A. Genetic distances among populations were estimated from randomly amplified polymorphic DNA (RAPD). Genetic analyses indicated much less divergence among Oregon populations than among Arizona populations in an arid environment. 3. Behavioural observations support the genetic data: Oregon populations exhibit little differentiation in swimming behaviour, whereas Hyalella populations in Arizona exhibit extremes in swimming behaviour. 4. These results provide preliminary support for the hypothesis that a xeric landscape promotes genetic and behavioural divergence among amphipods. Many aquatic invertebrates classified as panmictic populations may encompass genetically distinct groups; those isolated by a xeric landscape are especially prone to diversification.

Original languageEnglish (US)
Pages (from-to)587-593
Number of pages7
JournalFreshwater Biology
Volume40
Issue number4
DOIs
StatePublished - 1998

Fingerprint

aquatic ecosystem
divergence
genetic variation
amphipod
swimming behavior
Amphipoda
invertebrate
Hyalella
Hyalella azteca
arid environment
aquatic invertebrates
aquatic ecosystems
dry environmental conditions
transect
genetic distance
DNA
invertebrates

Keywords

  • Amphipod
  • Dispersal
  • Evolution
  • Genetics
  • Hyalella

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Do xeric landscapes increase genetic divergence in aquatic ecosystems? / Thomas, E. Perry; Blinn, Dean W.; Keim, Paul S.

In: Freshwater Biology, Vol. 40, No. 4, 1998, p. 587-593.

Research output: Contribution to journalArticle

Thomas, E. Perry ; Blinn, Dean W. ; Keim, Paul S. / Do xeric landscapes increase genetic divergence in aquatic ecosystems?. In: Freshwater Biology. 1998 ; Vol. 40, No. 4. pp. 587-593.
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