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Coral Reefs

, Volume 35, Issue 3, pp 1097–1107 | Cite as

Patterns of population structure and dispersal in the long-lived “redwood” of the coral reef, the giant barrel sponge (Xestospongia muta)

  • Vincent P. Richards
  • Andrea M. Bernard
  • Kevin A. Feldheim
  • Mahmood S. Shivji
Report

Abstract

Sponges are one of the dominant fauna on Florida and Caribbean coral reefs, with species diversity often exceeding that of scleractinian corals. Despite the key role of sponges as structural components, habitat providers, and nutrient recyclers in reef ecosystems, their dispersal dynamics are little understood. We used ten microsatellite markers to study the population structure and dispersal patterns of a prominent reef species, the giant barrel sponge (Xestospongia muta), the long-lived “redwood” of the reef, throughout Florida and the Caribbean. F-statistics, exact tests of population differentiation, and Bayesian multi-locus genotype analyses revealed high levels of overall genetic partitioning (F ST = 0.12, P = 0.001) and grouped 363 individuals collected from the Bahamas, Honduras, US Virgin Islands, Key Largo (Florida), and the remainder of the Florida reef tract into at minimum five genetic clusters (K = 5). Exact tests, however, revealed further differentiation, grouping sponges sampled from five locations across the Florida reef tract (~250 km) into three populations, suggesting a total of six genetic populations across the eight locations sampled. Assignment tests showed dispersal over ecological timescales to be limited to relatively short distances, as the only migration detected among populations was within the Florida reef tract. Consequently, populations of this major coral reef benthic constituent appear largely self-recruiting. A combination of levels of genetic differentiation, genetic distance, and assignment tests support the important role of the Caribbean and Florida currents in shaping patterns of contemporary and historical gene flow in this widespread coral reef species.

Keywords

Marine sponge Microsatellite Genetic connectivity Xestospongia muta Caribbean 

Notes

Acknowledgments

This study was supported by funding from NOAA to the National Coral Reef Institute, the Guy Harvey Ocean Foundation, the Pritzker Foundation to the Pritzker Laboratory for Molecular Systematics and Evolution, the NOAA Center for Sponsored Coastal Ocean Research under award NA11NOS4780045 to the University of Miami, and Nova Southeastern University. We thank M. Debiasse for help with sample collections. Tissue samples were collected under the approval of permits obtained from the Florida Fish and Wildlife Conservation Commission (08SR-1087) and the National Parks Service (DRTO-2007-SCI-0002).

Supplementary material

338_2016_1435_MOESM1_ESM.docx (96 kb)
Supplementary material 1 (DOCX 95 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Vincent P. Richards
    • 1
    • 2
  • Andrea M. Bernard
    • 2
    • 3
  • Kevin A. Feldheim
    • 4
  • Mahmood S. Shivji
    • 2
    • 3
  1. 1.Department of Biological Sciences, College of Agriculture, Forestry and Life SciencesClemson UniversityClemsonUSA
  2. 2.National Coral Reef Institute, Halmos College of Natural Sciences and OceanographyNova Southeastern UniversityDania BeachUSA
  3. 3.Guy Harvey Research Institute, Halmos College of Natural Sciences and OceanographyNova Southeastern UniversityDania BeachUSA
  4. 4.Pritzker Laboratory for Molecular Systematics and EvolutionField Museum of Natural HistoryChicagoUSA

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