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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Population dynamics, relative growth and sex change of the protandric simultaneous hermaphrodite Exhippolysmata oplophoroides (Caridea: Lysmatidae) close to an upwelling area

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Author(s):
Pescinelli, Regis A. [1] ; Davanso, Thiago M. [1] ; Pantaleao, Joao A. F. [1] ; Carvalho-Batista, Abner [1] ; Bauer, Raymond T. [2] ; Costa, Rogerio C. [1]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo State UNESP, Lab Biol Marine & Freshwater Shrimp LABCAM, Sch Sci, Dept Biol Sci, Ave Engn Luiz Edmundo Corrijo Coube 14-01, BR-17033360 Bauru, SP - Brazil
[2] Univ Louisiana Lafayette, Dept Biol, Lafayette, LA 70504 - USA
Total Affiliations: 2
Document type: Journal article
Source: Journal of the Marine Biological Association of the United Kingdom; v. 98, n. 4, p. 727-734, JUN 2018.
Web of Science Citations: 0
Abstract

The present study investigated the population dynamics of Exhippolysmata oplophoroides in an area influenced by upwelling, focusing on reproductive period, sex ratio, growth rate, longevity, mortality, relative growth and size of sex change. We also tested the hypothesis that the appendices internae increased in size with sex change from the male to the simultaneous hermaphrodite phase as possible replacements for the male appendices masculinae, which are reduced or lost at sex change. Population structure was assessed by the distribution of size frequency in three demographic groups: male phase, hermaphrodite phase with, and without embryos. For relative growth analysis, the length of the following structures was measured: carapace, second pleuron, first pereopod, second pereopod, appendices internae of the second to fifth pleopods, and appendix masculina. Smaller size classes were composed only by male-phase individuals. The sex ratio was significantly biased towards the simultaneous hermaphrodite phase. Reproduction was continuous in the population throughout the year. Slower growth rates but higher maximum body sizes than those estimated at other locations in south-eastern Brazil were observed in the population studied. Cooler temperatures and higher nutrient levels associated with upwelling may have produced this pattern of reproduction and growth, similar to that found in more southerly austral latitudes. We also found that sex change influences the relative growth of body structures such as the second pereopods, appendices internae, and appendix masculina, and hypotheses on the adaptive value of such allometric growth are proposed. (AU)

FAPESP's process: 09/54672-4 - Reproductive biology and dynamic population of the Penaeoidean shrimps (Crustacea, Decapoda) from southeastern Brazilian coast: latitudinal effect and suggestion for fishery control
Grantee:Rogério Caetano da Costa
Support Opportunities: Regular Research Grants
FAPESP's process: 13/12136-4 - Population dynamics of the shrimp Alpheus brasileiro Anker, 2012 (Decapoda: Caridea: Alpheidae) in Cananéia,south of São Paulo state
Grantee:Régis Augusto Pescinelli
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 10/50188-8 - Decapod crustaceans: multi-disciplinary characterization of the sea biodiversity of the State of São Paulo (taxonomy, spermiotaxonomy, molecular biology and population dynamics)
Grantee:Fernando Luis Medina Mantelatto
Support Opportunities: BIOTA-FAPESP Program - Thematic Grants