WoRMS source details
Benzie, J.A.H.; Sandusky, C.; Wilkinson, C.R. (1994). Genetic structure of dioctyoceratid sponge populations on the Western Coral Sea reefs. Marine Biology. 119: 335-345.
435885
Benzie, J.A.H.; Sandusky, C.; Wilkinson, C.R.
1994
Genetic structure of dioctyoceratid sponge populations on the Western Coral Sea reefs
Marine Biology
119: 335-345
Publication
Available for editors [request]
Allozyme variation at six polymorphic loci was examined in foliose dictyoceratid sponges from isolated reefs in the western Coral Sea. Four major genetic groups corresponding to the species Phyllospongia lamellosa, P. alcicornis, Carterospongia flabellifera and Collospongia auris were examined. A further two rare morphotypes from individual reefs formed genetic outliers to the P. lamellosa group, and may represent further taxa related to P. lamellosa. Gene frequencies in individual reef populations were largely in Hardy-Weinberg equilibrium, suggesting that random mating occurred in local populations of all four common species. Genetic variability was high and observed heterozygosities within populations ranged from 0.13 to 0.40. All four taxa showed significant genetic differentiation among populations (Fsr=0.05 to 0.36). Genetic distances (Nei's D) among populations within species ranged from 0 to 0.723 and increased with increasing
geographical separation. There was evidence that genetic differentiation between populations to the north and to the south of the southern limit of the South Equatorial Current (SEC) divergence was greater than expected on the basis of their geographical separation. The SEC divergence may form a partial barrier to gene flow among populations of these ecologically important sponges on the submerged Queensland Plateau. Levels of migration among populations of three of the species was less than those required to prevent divergence of the populations through genetic drift (Nm< 1). Restricted migration among populations may provide a mechanism to explain the occurrence of highly divergent populations of dictyoceratid sponges whose specific identity is not clear, and may allow them additionally to develop partial reproductive isolation from other populations.
Pacific, South West
Genetics (Generalities), Breeding
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Carteriospongia flabellifera (Bowerbank, 1877) accepted as Polyfibrospongia flabellifera Bowerbank, 1877 (biology source)
Collospongia auris Bergquist, Cambie & Kernan, 1990 (additional source)
Phyllospongia alcicornis (Esper, 1794) accepted as Polyfibrospongia alcicornis (Esper, 1794) (biology source)
Phyllospongia lamellosa (Esper, 1794) accepted as Phyllospongia foliascens (Pallas, 1766) (biology source)
Collospongia auris Bergquist, Cambie & Kernan, 1990 (additional source)
Phyllospongia alcicornis (Esper, 1794) accepted as Polyfibrospongia alcicornis (Esper, 1794) (biology source)
Phyllospongia lamellosa (Esper, 1794) accepted as Phyllospongia foliascens (Pallas, 1766) (biology source)
Coral Sea for Collospongia auris Bergquist, Cambie & Kernan, 1990
Coral Sea for Phyllospongia alcicornis (Esper, 1794)
Coral Sea for Phyllospongia lamellosa (Esper, 1794)
Coral Sea for Phyllospongia alcicornis (Esper, 1794)
Coral Sea for Phyllospongia lamellosa (Esper, 1794)