期刊
JOURNAL OF CRUSTACEAN BIOLOGY
卷 35, 期 2, 页码 166-176出版社
OXFORD UNIV PRESS
DOI: 10.1163/1937240X-00002318
关键词
androdioecy; Chelonibia testudinaria; Cirripedia; evolution; maximum age
资金
- National Science Foundation (NSF-OCE) [1029526]
- ONR [N00014-11-1-0180]
- University of Georgia Department of Genetics Hightower Award
- Directorate For Geosciences
- Division Of Ocean Sciences [1029526] Funding Source: National Science Foundation
Androdioecy is a sexual system characterized by the coexistence of hermaphrodites and males. It has evolved several times independently in ancestrally hermaphroditic barnacles. Life history and sex allocation theory suggest that dwarf males can occur in hermaphroditic populations with very small mating groups, low growth rates and high mortality rates. We tested these predictions in the androdioecious barnacle Chelonibia testudinaria (Linnaeus, 1758), an epibiont on loggerhead sea turtles, blue crabs, and horseshoe crabs. The potential number of mates is indeed very small on invertebrate hosts but larger on sea turtles. Growth rates are host-specific but comparable to those of other purely hermaphroditic barnacle species. The maximum age of hermaphrodites was less than three years, which is lower than in most purely hermaphroditic species. Our data suggest that small mating groups on some hosts and high mortality on all hosts contribute to the evolutionary origin and persistence of dwarf males.
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