Conservation Genetics

, Volume 11, Issue 1, pp 103–114 | Cite as

Rangewide microsatellite phylogeography of the endangered tidewater goby, Eucyclogobius newberryi (Teleostei: Gobiidae), a genetically subdivided coastal fish with limited marine dispersal

  • Dent A. Earl
  • Kristina D. Louie
  • Carolyne Bardeleben
  • Camm C. Swift
  • David K. Jacobs
Research Article

Abstract

The federally endangered tidewater goby, Eucyclogobius newberryi, is the most locally differentiated vertebrate with marine dispersal on the California Coast. It inhabits seasonally closed estuaries along the California coast; a habitat heavily impacted by anthropogenic filling and artificial opening, and exhibits varied metapopulation behavior as a consequence of hydrologic variation and anthropogenic impact. We describe 19 taxon-specific microsatellite loci, and assess genetic variation across the taxon range relative to genetic subdivision. A highly divergent southern clade, with reduced genetic variation, now confined to Northern San Diego County, appears to merit status as a separate species. The mid-coast is subdivided into regional groups with overall similarity to, and minor differences from previous mitochondrial sequence based clades. The northernmost region, although locally differentiated, forms a star phylogeny with limited geographic structure which we attribute to dispersal during Pleistocene/Holocene sea-level rise followed by increasing isolation during the Holocene. Bottleneck/founder events are evident in some habitats thought to have experienced (anthropogenic) extirpation. Further work with more, and larger, samples will be required to assess local and regional differences. Analytical methods employed include Analysis of Molecular Variance (AMOVA), Neighbor-Joining, Bayesian/STRUCTURE analysis and Principle Components Analysis (PCA).

Keywords

Endangered Estuary Metapopulation Phylogeography Tidewater goby 

Notes

Acknowledgments

We thank Kevin Lafferty and Todd Haney for assistance in collection. Use of Dr. Robert K. Wayne’s equipment and laboratory is greatly appreciated as is the advice of Dr. Thomas B. Smith, Robert K. Wayne, Dr. Klaus-Peter Koepfli, Dr. John Pollinger and Dr. Katy Semple Delany. Chris Winchell and Ryan Ellingson provided comments on the text and moral support. Bridgett vonHoldt provided comments on the text, advice, technical and moral support. Comments of two anonymous reviewers are greatly appreciated.

Supplementary material

10592_2009_8_MOESM1_ESM.docx (78 kb)
Supplementary material 1 (DOCX 79 kb)

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Dent A. Earl
    • 1
  • Kristina D. Louie
    • 1
  • Carolyne Bardeleben
    • 1
  • Camm C. Swift
    • 2
  • David K. Jacobs
    • 1
  1. 1.Ecology and Evolutionary BiologyUCLASouth Los AngelesUSA
  2. 2.Entrix, Inc.VenturaUSA

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