Abstract:
:The mangrove killifish (Kryptolebias marmoratus) is the only vertebrate known to be capable of self-fertilization. Its gonad is typically an ovotestis that simultaneously produces eggs and sperm, and fertilization is internal. Although most populations of this species consist primarily or exclusively of hermaphroditic individuals, gonochoristic males occur at approximately 20% frequency in a natural population at Twin Cays, Belize. Here we use a battery of 36 microsatellite loci to document a striking genetic pattern (high intraspecimen heterozygosities and low within-population linkage disequilibria) that differs qualitatively from the highly homozygous (or "clonal") genetic architecture characteristic of killifish populations previously studied in Florida, where males are much rarer. These findings document that outcrossing (probably between gonochoristic males and hermaphrodites) is common at the Belize site, and, more importantly, they demonstrate the dramatic impact that functional androdioecy can have on the population genetic architecture of this reproductively unique vertebrate species.
journal_name
Proc Natl Acad Sci U S Aauthors
Mackiewicz M,Tatarenkov A,Taylor DS,Turner BJ,Avise JCdoi
10.1073/pnas.0603847103subject
Has Abstractpub_date
2006-06-27 00:00:00pages
9924-8issue
26eissn
0027-8424issn
1091-6490pii
0603847103journal_volume
103pub_type
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