Genetic variation in a freshwater bryozoan. I: Populations in the Thames basin, UK

T W Hatton-Ellis, Leslie Robert Noble, B Okamura

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In spite of increasing interest in metapopulation dynamics, the genetic consequences of a metapopulation structure remain poorly understood. Here we examine the metapopulation genetic structure of the colonial, facultatively sexual freshwater bryozoan Cristatella mucedo, in the Thames basin of southern England, UK. Populations from nine sites were sampled and colonies genetically characterized using random amplified polymorphic DNA (RAPD)-PCR. A total of 78 different clones was detected over all sites. Despite the large number of clones, genetic distances among clones both within and among sites were very small. Nonetheless, no clone was present at more than one site even though C. mucedo has an asexual dispersal propagule, and clones strongly clustered by sites. No consistent pattern of clonal structure was evident, with both the number and equitability of clones varying greatly among sites. Although sites were genetically distinct, population genetic regions were absent, and a Mantel test indicated that there was no relationship between geographical distances among sites and genetic distances among populations. Our results indicate that C. mucedo exists as a classical metapopulation in the Thames basin, with dispersal independent of distance and all sites contributing to the genetic diversity of the metapopulation.

Original languageEnglish
Pages (from-to)1575-1585
Number of pages11
JournalMolecular Ecology
Volume7
Issue number11
Publication statusPublished - Nov 1998

Keywords

  • bryozoans
  • clonal reproduction
  • metapopulations
  • migration
  • population structure
  • RAPD
  • CRISTATELLA-MUCEDO BRYOZOA
  • AMPLIFIED POLYMORPHIC DNA
  • WATER BRYOZOAN
  • RAPD MARKERS
  • PHYLACTOLAEMATA
  • DIVERSITY
  • PATTERNS
  • FLOW

Cite this

Hatton-Ellis, T. W., Noble, L. R., & Okamura, B. (1998). Genetic variation in a freshwater bryozoan. I: Populations in the Thames basin, UK. Molecular Ecology, 7(11), 1575-1585.

Genetic variation in a freshwater bryozoan. I: Populations in the Thames basin, UK. / Hatton-Ellis, T W ; Noble, Leslie Robert; Okamura, B .

In: Molecular Ecology, Vol. 7, No. 11, 11.1998, p. 1575-1585.

Research output: Contribution to journalArticle

Hatton-Ellis, TW, Noble, LR & Okamura, B 1998, 'Genetic variation in a freshwater bryozoan. I: Populations in the Thames basin, UK', Molecular Ecology, vol. 7, no. 11, pp. 1575-1585.
Hatton-Ellis TW, Noble LR, Okamura B. Genetic variation in a freshwater bryozoan. I: Populations in the Thames basin, UK. Molecular Ecology. 1998 Nov;7(11):1575-1585.
Hatton-Ellis, T W ; Noble, Leslie Robert ; Okamura, B . / Genetic variation in a freshwater bryozoan. I: Populations in the Thames basin, UK. In: Molecular Ecology. 1998 ; Vol. 7, No. 11. pp. 1575-1585.
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N2 - In spite of increasing interest in metapopulation dynamics, the genetic consequences of a metapopulation structure remain poorly understood. Here we examine the metapopulation genetic structure of the colonial, facultatively sexual freshwater bryozoan Cristatella mucedo, in the Thames basin of southern England, UK. Populations from nine sites were sampled and colonies genetically characterized using random amplified polymorphic DNA (RAPD)-PCR. A total of 78 different clones was detected over all sites. Despite the large number of clones, genetic distances among clones both within and among sites were very small. Nonetheless, no clone was present at more than one site even though C. mucedo has an asexual dispersal propagule, and clones strongly clustered by sites. No consistent pattern of clonal structure was evident, with both the number and equitability of clones varying greatly among sites. Although sites were genetically distinct, population genetic regions were absent, and a Mantel test indicated that there was no relationship between geographical distances among sites and genetic distances among populations. Our results indicate that C. mucedo exists as a classical metapopulation in the Thames basin, with dispersal independent of distance and all sites contributing to the genetic diversity of the metapopulation.

AB - In spite of increasing interest in metapopulation dynamics, the genetic consequences of a metapopulation structure remain poorly understood. Here we examine the metapopulation genetic structure of the colonial, facultatively sexual freshwater bryozoan Cristatella mucedo, in the Thames basin of southern England, UK. Populations from nine sites were sampled and colonies genetically characterized using random amplified polymorphic DNA (RAPD)-PCR. A total of 78 different clones was detected over all sites. Despite the large number of clones, genetic distances among clones both within and among sites were very small. Nonetheless, no clone was present at more than one site even though C. mucedo has an asexual dispersal propagule, and clones strongly clustered by sites. No consistent pattern of clonal structure was evident, with both the number and equitability of clones varying greatly among sites. Although sites were genetically distinct, population genetic regions were absent, and a Mantel test indicated that there was no relationship between geographical distances among sites and genetic distances among populations. Our results indicate that C. mucedo exists as a classical metapopulation in the Thames basin, with dispersal independent of distance and all sites contributing to the genetic diversity of the metapopulation.

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KW - population structure

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KW - DIVERSITY

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