Hybrids of Two Closely Related Tropical Sea Urchins (Genus Echinometra): Evidence Against Postzygotic Isolating Mechanisms
نویسندگان
چکیده
منابع مشابه
Strong reproductive isolation between closely related tropical sea urchins (genus Echinometra).
Morphological, mitochondrial DNA, and single-copy nuclear DNA differences show that the tropical sea urchin Echinometra mathaei is composed of at least four independent gene pools. Evolutionary distance between species measured with restriction-site changes (for mitochondrial DNA) and thermal renaturation (for single-copy nuclear DNA) is 1%-3% nucleotide divergence. Thus these are the most clos...
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We report here, the effects of extended competency on larval survival, metamorphosis, and postlarval juvenile growth of four closely related species of tropical sea urchins, Echinometra sp. A (Ea), E. mathaei (Em), Echinometra sp. C (Ec), and E. oblonga (Eo). Planktotrophic larvae of all four species fed on cultured phytoplankton (Chaetoceros gracilis) attained metamorphic competence within 22-...
متن کاملAdaptive evolution of sperm bindin tracks egg incompatibility in neotropical sea urchins of the genus Echinometra.
Bindin is a gamete recognition protein known to control species-specific sperm-egg adhesion and membrane fusion in sea urchins. Previous analyses have shown that diversifying selection on bindin amino acid sequence is found when gametically incompatible species are compared, but not when species are compatible. The present study analyzes bindin polymorphism and divergence in the three closely r...
متن کاملInterspecific Hybridization and Backcrosses between Two Sibling Species of Pacific Sea Urchins (Genus Echinometra) on Okinawan Intertidal Reefs
M. Aminur Rahman and Tsuyoshi Uehara (2004) Interspecific hybridization and backcrosses between two sibling species of Pacific sea urchins (genus Echinometra) on Okinawan Intertidal Reefs. Zoological Studies 43(1): 93-111. Four genetically divergent Pacific sea urchins belonging to the genus Echinometra occur sympatrically and abundantly along the coast of Okinawa Island. Among them, the 2 most...
متن کاملConspecific sperm precedence in two species of tropical sea urchins.
Conspecific sperm precedence occurs when females are exposed to sperm from males of multiple species, but preferentially use sperm of a conspecific. Conspecific sperm precedence and its mechanisms have been documented widely in terrestrial species, in which complex female behaviors or reproductive tract morphologies can allow many opportunities for female choice and sperm competition, however, ...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 2001
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1543303