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Abstract:

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.

Registro:

Documento: Artículo
Título:Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides
Autor:Baeza, J.A.; Braga, A.A.; López-Greco, L.S.; Perez, E.; Negreiros-Fransozo, M.L.; Fransozo, A.
Filiación:Smithsonian Marine Station at Fort Pierce, 701 Seaway Drive, Fort Pierce, FL 34949, United States
Smithsonian Tropical Research Institute, Apartado Postal, 0843-03092 Balboa, Ancón, Panama
Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo, 1281 Coquimbo, Chile
Dept. Medicina Veterinária, Centro de Ciências Agrárias, UFES, Alegre, ES 29500-000, Brazil
Dept. of Biodiversity and Experimental Biology, FCEyN, University of Buenos Aires, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina
Centro de Estudios Avanzados en Zonas Aridas (CEAZA), Coquimbo, Chile
NEBECC (Crustacean Biology, Ecology and Culture Study Group), Departamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, SP 18.618-000, Brazil
Palabras clave: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
Año:2010
Volumen:157
Número:12
Página de inicio:2643
Página de fin:2653
DOI: http://dx.doi.org/10.1007/s00227-010-1525-2
Título revista:Marine Biology
Título revista abreviado:Mar. Biol.
ISSN:00253162
CODEN:MBIOA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00253162_v157_n12_p2643_Baeza

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Citas:

---------- APA ----------
Baeza, J.A., Braga, A.A., López-Greco, L.S., Perez, E., Negreiros-Fransozo, M.L. & Fransozo, A. (2010) . Population dynamics, sex ratio and size at sex change in a protandric simultaneous hermaphrodite, the spiny shrimp Exhippolysmata oplophoroides. Marine Biology, 157(12), 2643-2653.
http://dx.doi.org/10.1007/s00227-010-1525-2
---------- CHICAGO ----------
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" . Marine Biology 157, no. 12 (2010) : 2643-2653.
http://dx.doi.org/10.1007/s00227-010-1525-2
---------- MLA ----------
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" . Marine Biology, vol. 157, no. 12, 2010, pp. 2643-2653.
http://dx.doi.org/10.1007/s00227-010-1525-2
---------- VANCOUVER ----------
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. Mar. Biol. 2010;157(12):2643-2653.
http://dx.doi.org/10.1007/s00227-010-1525-2