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...

Descripción completa

Guardado en:
Detalles Bibliográficos
Publicado: 2000
Materias:
Realised fecundity
Relative growth
Size structure
crab
population dynamics
population ecology
reproductive behavior
Venezuela
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v439_n_p151_LopezGreco
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 paper:paper_00188158_v439_n_p151_LopezGreco
record_format dspace
spelling paper:paper_00188158_v439_n_p151_LopezGreco2023-06-08T14:39:46Z Population features of Microphrys bicornutus latreille, 1825 (Brachyura, Majidae) from Isla Margarita, Venezuela 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. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v439_n_p151_LopezGreco 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
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.
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
publishDate 2000
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00188158_v439_n_p151_LopezGreco
http://hdl.handle.net/20.500.12110/paper_00188158_v439_n_p151_LopezGreco
_version_ 1768545079411081216

Ejemplares similares