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Corpus Systématique Animale

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High frequency of gonadal neoplasia in a hard clam ( Mercenaria spp.) hybrid zone

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Springer (journals)
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  • T. M. Bert 1
  • D. M. Hesselman 2
  • W. S. Arnold 1
  • W. S. Moore 3
  • H. Cruz-Lopez 1
  • D. C. Marelli 1
  • 1) Department of Natural Resources, Florida Marine Research Institute, 100 Eighth Avenue Southeast, 33701, St. Petersburg, Florida, USA
  • 2) Department of Health and Human Services, Food and Drug Administration, Southeast Regional Office, 60 Eighth Street Northeast, 30309, Atlanta, Georgia, USA
  • 3) Department of Biological Sciences, Wayne State University, 48202, Detroit, Michigan, USA

The etiology of bivalve gonadal neoplasia has eluded invertebrate pathologists for over 20 yr. In a coastal Florida (USA) lagoon, where two species of hard clams (Mercenaria mercenaria and M. campechiensis) cooccur and hybridize, they exhibit a persistent, unusually high frequency of gonadal neoplasia. Hybridity, rather than environmental or other biological factors, appears to determine susceptibility, implicating a genetic mechanism in the etiology of the disease. However, the increase in frequency of occurrence of the disease in hybrids is not accompanied by an increase in severity beyond that experienced by pure-species genotypes, suggesting that only some components of the genetic mechanism are affected by hybridization. Differences between sexes in the overall and size-specific frequency of occurrence and in severity of the disease suggest that the genetic mechanism is associated with sex. The excessive susceptibility of hybrid genotypes to gonadal neoplasia results in reduced hybrid fitness and constitutes an unambiguous example of a cellular disease that acts as a barrier to gene flow between species. Moreover, because these species are of commercial importance, fishery practices that promote hybridization are common and, over time, may reduce the fitness of natural populations.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - agronomie. sciences du sol et productions vegetales
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Ecology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - marine & freshwater biology
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Marine Biology

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  • Mollusques
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