Patterns of gamete incompatibility between the blue mussels Mytilus edulis and M. trossulus

Previous research on gametic incompatibility in marine invertebrates suggests that for highly dispersive marine invertebrate species, barriers to fertilization among closely related taxa are often incomplete and sometimes asymmetric. The nature of these barriers can dramatically affect the patterns...

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Published in:Marine biology 2003-08, Vol.143 (2), p.317-325
Main Authors: Rawson, P. D, Slaughter, C, Yund, P. O
Format: Article
Language:English
Subjects:
allopatry
Animals
aquatic invertebrates
Biological and medical sciences
Eggs
Experimental design
females
Fundamental and applied biological sciences. Psychology
gene flow
genetic variation
Genetics of eukaryotes. Biological and molecular evolution
Hybrids
Invertebrata
latitude
longitude
Marine
Marine biology
Marine invertebrates
Mollusks
mussels
Mytilus edulis
Mytilus trossulus
Population genetics, reproduction patterns
Speciation
spermatozoa
sympatry
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creator Rawson, P. D
Slaughter, C
Yund, P. O
description Previous research on gametic incompatibility in marine invertebrates suggests that for highly dispersive marine invertebrate species, barriers to fertilization among closely related taxa are often incomplete and sometimes asymmetric. The nature of these barriers can dramatically affect the patterns of gene flow and genetic differentiation between species, and thus speciation. Blue mussels, in the genus Mytilus, are genetically distinct in allopatry yet hybrids are present wherever any two species within the group co-occur. The present study sampled M. edulis (L.) and M. trossulus (Gould) in May and June 2001 from the East Bay section of Cobscook Bay, Maine, USA (latitude 44°56′30″N; longitude 67°07′50″W), where the two species are sympatric. Gamete incompatibility was investigated in a series of laboratory fertilizations carried out in July 2001. The proportion of fertilized eggs typically exceeded 80% at sperm concentrations of 10³–10⁴ ml⁻¹ among intraspecific matings (n=18), but was
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D ; Slaughter, C ; Yund, P. O</creator><creatorcontrib>Rawson, P. D ; Slaughter, C ; Yund, P. O</creatorcontrib><description>Previous research on gametic incompatibility in marine invertebrates suggests that for highly dispersive marine invertebrate species, barriers to fertilization among closely related taxa are often incomplete and sometimes asymmetric. The nature of these barriers can dramatically affect the patterns of gene flow and genetic differentiation between species, and thus speciation. Blue mussels, in the genus Mytilus, are genetically distinct in allopatry yet hybrids are present wherever any two species within the group co-occur. The present study sampled M. edulis (L.) and M. trossulus (Gould) in May and June 2001 from the East Bay section of Cobscook Bay, Maine, USA (latitude 44°56′30″N; longitude 67°07′50″W), where the two species are sympatric. Gamete incompatibility was investigated in a series of laboratory fertilizations carried out in July 2001. The proportion of fertilized eggs typically exceeded 80% at sperm concentrations of 10³–10⁴ ml⁻¹ among intraspecific matings (n=18), but was &lt;30% even at sperm concentrations in excess of 10⁵–10⁶ ml⁻¹ for interspecific matings (n=13). Further analysis indicated that approximately 100- to 700-fold higher sperm concentrations were required to achieve 20% fertilization in interspecific matings relative to intraspecific matings, indicating strong barriers to interspecific fertilization. The proportion of fertilized eggs did not follow this general pattern in all matings, however. The eggs from two (out of five) M. edulis females were almost as receptive to M. trossulus sperm as they were to M. edulis sperm. In contrast, the eggs from all M. trossulus females (n=3) were unreceptive to M. edulis sperm, suggesting that fertilization barriers between these species may be asymmetric. 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D</creatorcontrib><creatorcontrib>Slaughter, C</creatorcontrib><creatorcontrib>Yund, P. O</creatorcontrib><title>Patterns of gamete incompatibility between the blue mussels Mytilus edulis and M. trossulus</title><title>Marine biology</title><description>Previous research on gametic incompatibility in marine invertebrates suggests that for highly dispersive marine invertebrate species, barriers to fertilization among closely related taxa are often incomplete and sometimes asymmetric. The nature of these barriers can dramatically affect the patterns of gene flow and genetic differentiation between species, and thus speciation. Blue mussels, in the genus Mytilus, are genetically distinct in allopatry yet hybrids are present wherever any two species within the group co-occur. 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ispartof Marine biology, 2003-08, Vol.143 (2), p.317-325
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subjects allopatry
Animals
aquatic invertebrates
Biological and medical sciences
Eggs
Experimental design
females
Fundamental and applied biological sciences. Psychology
gene flow
genetic variation
Genetics of eukaryotes. Biological and molecular evolution
Hybrids
Invertebrata
latitude
longitude
Marine
Marine biology
Marine invertebrates
Mollusks
mussels
Mytilus edulis
Mytilus trossulus
Population genetics, reproduction patterns
Speciation
spermatozoa
sympatry
title Patterns of gamete incompatibility between the blue mussels Mytilus edulis and M. trossulus
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