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Evolutionary Ecology of Social and Sexual SystemsCrustaceans as Model Organisms$
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J. Emmett Duffy and Martin Thiel

Print publication date: 2007

Print ISBN-13: 9780195179927

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780195179927.001.0001

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Hermaphroditism in Caridean Shrimps

Hermaphroditism in Caridean Shrimps

Mating Systems, Sociobiology, and Evolution, with Special Reference to Lysmata

Chapter:
(p.232) 11 Hermaphroditism in Caridean Shrimps
Source:
Evolutionary Ecology of Social and Sexual Systems
Author(s):

Raymond T. Bauer

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195179927.003.0011

Hermaphroditism is rare in the decapod Crustacea, but protandry (male to female sex change) is not uncommon in caridean shrimps. Protandric shrimps are generally mobile, living in high-density aggregations, with small males and larger females. The mating system is polygynous, with males using a “pure searching” tactic to maximize mating success. Protandry is fairly well explained by the “Size Advantage” Model, in which male mating success is not positively correlated with size but female fecundity is. In the genus Lysmata (“cleaner shrimps”), male-phase individuals change to a female phase as in protandric shrimps, but unlike them retain male gonadal tissues, functioning as non-reciprocal outcrossing simultaneous hermaphrodites. A dichotomy in the sociobiology of Lysmata spp. (“airs” and “Crowd” species) suggests a historical contingency hypothesis (unique past occurrence of particular selective pressures). Phylogenetic analyses are needed to test this hypothesis about the evolution of hermaphroditism in caridean shrimps.

Keywords:   protandry, hermaphroditism, Size Advantage Model, polygyny, phylogenetic analyses

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