Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela

The aim of this study is to characterize the population biology (sex ratio, size structure, relative growth of reproductive characters and realised fecundity) of the crab Microphrys bicornutus from Isla Margarita, Venezuela. Nearly 100 crabs were collected and fixed monthly during 1998. In the labor...

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Autores principales: López Greco, L.S., Hernández, J.E., Bolaños, J., Rodríguez, E.M., Hernández, G.
Formato: JOUR
Materias:
Realised fecundity
Relative growth
Size structure
crab
population dynamics
population ecology
reproductive behavior
Venezuela
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00188158_v439_n_p151_LopezGreco
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00188158_v439_n_p151_LopezGreco
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spelling todo:paper_00188158_v439_n_p151_LopezGreco2023-10-03T14:15:54Z Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela López Greco, L.S. Hernández, J.E. Bolaños, J. Rodríguez, E.M. Hernández, G. Realised fecundity Relative growth Size structure crab population dynamics population ecology reproductive behavior Venezuela The aim of this study is to characterize the population biology (sex ratio, size structure, relative growth of reproductive characters and realised fecundity) of the crab Microphrys bicornutus from Isla Margarita, Venezuela. Nearly 100 crabs were collected and fixed monthly during 1998. In the laboratory, crabs were sexed and measured: Maximum carapace length, chelae length, chelae and abdomen width for females and first pleopod length for males. Additionally, 96 ovigerous females were collected to determine fecundity. The following measurements were taken for each female: body wet weight (BWW), body dry weight (BDW), egg wet weight (EWW), egg dry weight (EDW) and number of eggs (NE). The following determinations were made: relative fecundity (RF) = NE/BDW and reproductive output (RO) = (EDW/BDW) × 100. Relative size at the onset of maturity (RSOM) was calculated as minimum ovigerous female/female's maximum size. The results indicate that the sex ratio is nearly 1:1 during the entire year. Ovigerous females and moulted males and females were observed throughout the year. Size frequency distribution and size at the onset of sexual maturity, estimated by relative growth of the sexual secondary characters and RSOM value, differed from those estimated in studies done in Jamaica and Buchuaco, Venezuela. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00188158_v439_n_p151_LopezGreco
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Realised fecundity
Relative growth
Size structure
crab
population dynamics
population ecology
reproductive behavior
Venezuela
spellingShingle Realised fecundity
Relative growth
Size structure
crab
population dynamics
population ecology
reproductive behavior
Venezuela
López Greco, L.S.
Hernández, J.E.
Bolaños, J.
Rodríguez, E.M.
Hernández, G.
Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela
topic_facet Realised fecundity
Relative growth
Size structure
crab
population dynamics
population ecology
reproductive behavior
Venezuela
description The aim of this study is to characterize the population biology (sex ratio, size structure, relative growth of reproductive characters and realised fecundity) of the crab Microphrys bicornutus from Isla Margarita, Venezuela. Nearly 100 crabs were collected and fixed monthly during 1998. In the laboratory, crabs were sexed and measured: Maximum carapace length, chelae length, chelae and abdomen width for females and first pleopod length for males. Additionally, 96 ovigerous females were collected to determine fecundity. The following measurements were taken for each female: body wet weight (BWW), body dry weight (BDW), egg wet weight (EWW), egg dry weight (EDW) and number of eggs (NE). The following determinations were made: relative fecundity (RF) = NE/BDW and reproductive output (RO) = (EDW/BDW) × 100. Relative size at the onset of maturity (RSOM) was calculated as minimum ovigerous female/female's maximum size. The results indicate that the sex ratio is nearly 1:1 during the entire year. Ovigerous females and moulted males and females were observed throughout the year. Size frequency distribution and size at the onset of sexual maturity, estimated by relative growth of the sexual secondary characters and RSOM value, differed from those estimated in studies done in Jamaica and Buchuaco, Venezuela.
format JOUR
author López Greco, L.S.
Hernández, J.E.
Bolaños, J.
Rodríguez, E.M.
Hernández, G.
author_facet López Greco, L.S.
Hernández, J.E.
Bolaños, J.
Rodríguez, E.M.
Hernández, G.
author_sort López Greco, L.S.
title Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela
title_short Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela
title_full Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela
title_fullStr Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela
title_full_unstemmed Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela
title_sort population features of microphrys bicornutus latreille, 1825 (brachyura, majidae) from isla margarita, venezuela
url http://hdl.handle.net/20.500.12110/paper_00188158_v439_n_p151_LopezGreco
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