Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides

One of the main goals of sex allocation theory is understanding sex ratio evolution. However, theoretical studies predicting sex ratios in species with unusual sexual systems, such as protandric simultaneous (PS) hermaphroditism, are rare. In PS hermaphrodites, juveniles first develop into functiona...

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Detalles Bibliográficos
Autores principales: Baeza, J.A., Braga, A.A., López-Greco, L.S., Perez, E., Negreiros-Fransozo, M.L., Fransozo, A.
Formato: JOUR
Materias:
bay
body size
conspecific
crustacean
encounter rate
evolutionary theory
hermaphrodite
juvenile
protandry
reproductive strategy
sex allocation
sex ratio
sex reversal
Decapoda (Crustacea)
Exhippolysmata
Exhippolysmata oplophoroides
Lysmata
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00253162_v157_n12_p2643_Baeza
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00253162_v157_n12_p2643_Baeza
record_format dspace
spelling todo:paper_00253162_v157_n12_p2643_Baeza2023-10-03T14:35:58Z Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides Baeza, J.A. Braga, A.A. López-Greco, L.S. Perez, E. Negreiros-Fransozo, M.L. Fransozo, A. bay body size conspecific crustacean encounter rate evolutionary theory hermaphrodite juvenile protandry reproductive strategy sex allocation sex ratio sex reversal Decapoda (Crustacea) Exhippolysmata Exhippolysmata oplophoroides Lysmata One of the main goals of sex allocation theory is understanding sex ratio evolution. However, theoretical studies predicting sex ratios in species with unusual sexual systems, such as protandric simultaneous (PS) hermaphroditism, are rare. In PS hermaphrodites, juveniles first develop into functional males that mature into simultaneous hermaphrodites later in life. Here, we report on the sex ratio (males/males + hermaphrodites) in the PS hermaphroditic shrimp Exhippolysmata oplophoroides. A 2-year study demonstrated that hermaphrodites dominated the population in two different bays. This skewed sex ratio may be explained by limited encounter rates among conspecifics. In agreement with this idea, the density of shrimps was extremely low (≤1 shrimp km-2) at the two study sites. Size at sex phase change and sex ratios remained relatively stable through time at the two bays. The stability of these parameters might be explained by the rather steady population structure of this species during the study period. A review of sex ratios in PS hermaphroditic shrimps (Lysmata and Exhippolysmata) revealed considerable variation; some species have male- and others hermaphrodite-skewed sex ratios. The conditions explaining inter- and intra-specific sex ratio variation in protandric simultaneous hermaphroditic species remain to be addressed. © 2010 Springer-Verlag. Fil:López-Greco, L.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00253162_v157_n12_p2643_Baeza
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic bay
body size
conspecific
crustacean
encounter rate
evolutionary theory
hermaphrodite
juvenile
protandry
reproductive strategy
sex allocation
sex ratio
sex reversal
Decapoda (Crustacea)
Exhippolysmata
Exhippolysmata oplophoroides
Lysmata
spellingShingle bay
body size
conspecific
crustacean
encounter rate
evolutionary theory
hermaphrodite
juvenile
protandry
reproductive strategy
sex allocation
sex ratio
sex reversal
Decapoda (Crustacea)
Exhippolysmata
Exhippolysmata oplophoroides
Lysmata
Baeza, J.A.
Braga, A.A.
López-Greco, L.S.
Perez, E.
Negreiros-Fransozo, M.L.
Fransozo, A.
Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides
topic_facet bay
body size
conspecific
crustacean
encounter rate
evolutionary theory
hermaphrodite
juvenile
protandry
reproductive strategy
sex allocation
sex ratio
sex reversal
Decapoda (Crustacea)
Exhippolysmata
Exhippolysmata oplophoroides
Lysmata
description One of the main goals of sex allocation theory is understanding sex ratio evolution. However, theoretical studies predicting sex ratios in species with unusual sexual systems, such as protandric simultaneous (PS) hermaphroditism, are rare. In PS hermaphrodites, juveniles first develop into functional males that mature into simultaneous hermaphrodites later in life. Here, we report on the sex ratio (males/males + hermaphrodites) in the PS hermaphroditic shrimp Exhippolysmata oplophoroides. A 2-year study demonstrated that hermaphrodites dominated the population in two different bays. This skewed sex ratio may be explained by limited encounter rates among conspecifics. In agreement with this idea, the density of shrimps was extremely low (≤1 shrimp km-2) at the two study sites. Size at sex phase change and sex ratios remained relatively stable through time at the two bays. The stability of these parameters might be explained by the rather steady population structure of this species during the study period. A review of sex ratios in PS hermaphroditic shrimps (Lysmata and Exhippolysmata) revealed considerable variation; some species have male- and others hermaphrodite-skewed sex ratios. The conditions explaining inter- and intra-specific sex ratio variation in protandric simultaneous hermaphroditic species remain to be addressed. © 2010 Springer-Verlag.
format JOUR
author Baeza, J.A.
Braga, A.A.
López-Greco, L.S.
Perez, E.
Negreiros-Fransozo, M.L.
Fransozo, A.
author_facet Baeza, J.A.
Braga, A.A.
López-Greco, L.S.
Perez, E.
Negreiros-Fransozo, M.L.
Fransozo, A.
author_sort Baeza, J.A.
title Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides
title_short Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides
title_full Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides
title_fullStr Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides
title_full_unstemmed Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides
title_sort population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp exhippolysmata oplophoroides
url http://hdl.handle.net/20.500.12110/paper_00253162_v157_n12_p2643_Baeza
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