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

High frequency of gonadal neoplasia in a hard clam ( Mercenaria spp.) hybrid zone 227 117 117 1 1 T. M. Bert D. M. Hesselman W. S. Arnold W. S. Moore H. Cruz-Lopez D. C. Marelli Department of Natural Resources Florida Marine Research Institute 100 Eighth Avenue Southeast 33701 St. Petersburg Florida USA Department of Health and Human Services Food and Drug Administration, Southeast Regional Office 60 Eighth Street Northeast 30309 Atlanta Georgia USA Department of Biological Sciences Wayne State University 48202 Detroit Michigan USA Florida Game & Fresh Water Fish Commission 801 Northwest 40th Street 33431 Boca Raton Florida USA Abstract 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Biology Springer Journals

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

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References (38)

Publisher
Springer Journals
Copyright
Copyright © 1993 by Springer-Verlag
Subject
Life Sciences; Biomedicine general; Oceanography; Ecology; Microbiology; Zoology
ISSN
0025-3162
eISSN
1432-1793
DOI
10.1007/BF00346430
Publisher site
See Article on Publisher Site

Abstract

227 117 117 1 1 T. M. Bert D. M. Hesselman W. S. Arnold W. S. Moore H. Cruz-Lopez D. C. Marelli Department of Natural Resources Florida Marine Research Institute 100 Eighth Avenue Southeast 33701 St. Petersburg Florida USA Department of Health and Human Services Food and Drug Administration, Southeast Regional Office 60 Eighth Street Northeast 30309 Atlanta Georgia USA Department of Biological Sciences Wayne State University 48202 Detroit Michigan USA Florida Game & Fresh Water Fish Commission 801 Northwest 40th Street 33431 Boca Raton Florida USA Abstract 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.

Journal

Marine Biology – Springer Journals

Published: Sep 1, 1993

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