Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela

The mytilid Geukensia demissa invaded Lake Maracaibo and since it is a new species at this location, little is known about its reproductive biology. We describe the reproductive cycle of this bivalve mollusk on a beach (Nazaret) located along the straight that leads into Lake Maracaibo. During 12 mo...

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Hauptverfasser:	Báez, M, García-de-Severeyn, Y, Severeyn, H
Format:	info:eu-repo/semantics/article
Sprache:	eng
Veröffentlicht:	Iniversidad Autónoma de Baja California 2005
Schlagworte:	Geukensia demissa mussel reproductive cycle Venezuela mejillón ciclo reproductivo
Online Zugang:	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/73
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id	repositorioinstitucional-20.500.12930-7317
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spelling	repositorioinstitucional-20.500.12930-73172023-05-09T14:30:49Z Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela Ciclo reproductivo de Geukensia demissa (Bivalvia: Mytilidae) en la playa de Nazaret, El Moján, Estado Zulia, Venezuela Báez, M García-de-Severeyn, Y Severeyn, H Geukensia demissa mussel reproductive cycle Venezuela Geukensia demissa mejillón ciclo reproductivo Venezuela The mytilid Geukensia demissa invaded Lake Maracaibo and since it is a new species at this location, little is known about its reproductive biology. We describe the reproductive cycle of this bivalve mollusk on a beach (Nazaret) located along the straight that leads into Lake Maracaibo. During 12 months (January to December), 80 specimens were collected monthly from this beach. The animals were dissected and samples of their gonadal fluid were microscopically examined to detect gametes. The different stages of gonadal development are described according to Shafee, (1989). The gonad index was calculated by the equation IG = Σ(n × V)/N. Results indicated that G. demissa presents a continuous reproductive cycle, with mature, spawning animals occurring throughout the year. Two gametogenic processes occurred, one beginning during the dry season and extending until the onset of the rainy season, and another beginning during the rainy season and extending until late November, when the animals are once again mature. Two spawning peaks were observed, one in July and the other in December; 100% spawning in the population was not observed. Synchrony was found in spawning and maturation in both male and female mussels. Geukensia demissa es un mitílido que invadió el estuario del Lago de Maracaibo. De este mejillón, por ser una especie nueva en el lago, se desconocen todos los aspectos relacionados con su biología reproductiva, por lo que en este trabajó se describió el ciclo reproductivo de este molusco bivalvo, a partitr de una población ubicada en el Estrecho del Lago de Maracaibo (Nazaret). Durante 12 meses (enero a diciembre) fueron recolectados 80 animales en la playa de Nazaret, sector El Moján. A cada animal se le realizó una disección, tomando muestras del fluido gonadal que posteriormente se observaron al microscopio para determinar la presencia y el estado de madurez de los gametos. Los diferentes estados de desarrollo gametogénico fueron tomados de la clasificación descrita por Shafee (1989). El índice gonadal se calculó mediante la ecuación IG = Σ (n × V)/N. Los resultados mostraron que esta especie tiene un ciclo reproductivo continuo, presentando ejemplares maduros y desovados durante todo el año. Se observaron dos procesos gametogénicos: el primero comenzó en la época seca y se extendió hasta el comienzo de la época lluviosa, cuando los gametos alcanzaron su máxima madurez; el segundo comenzó en la época lluviosa (septiembre) y se extendió hasta finales de noviembre cuando los gametos volvieron a estar maduros. Se observaron dos picos de desove, uno en el mes de julio y el otro a finales de diciembre. No se observó 100% de desove en la población. Se pudo apreciar sincronía en la madurez y el desove tanto en las hembras como en los machos. 2005-03-06 2021-06-03T03:54:53Z 2021-06-03T03:54:53Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/73 10.7773/cm.v31i11.73 https://hdl.handle.net/20.500.12930/7317 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/73/54 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 31 No. 1A (2005); 111-118 Ciencias Marinas; Vol. 31 Núm. 1A (2005); 111-118 2395-9053 0185-3880
institution	Repositorio Institucional
collection	DSpace
language	eng
topic	Geukensia demissa mussel reproductive cycle Venezuela Geukensia demissa mejillón ciclo reproductivo Venezuela
spellingShingle	Geukensia demissa mussel reproductive cycle Venezuela Geukensia demissa mejillón ciclo reproductivo Venezuela Báez, M García-de-Severeyn, Y Severeyn, H Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela
description	The mytilid Geukensia demissa invaded Lake Maracaibo and since it is a new species at this location, little is known about its reproductive biology. We describe the reproductive cycle of this bivalve mollusk on a beach (Nazaret) located along the straight that leads into Lake Maracaibo. During 12 months (January to December), 80 specimens were collected monthly from this beach. The animals were dissected and samples of their gonadal fluid were microscopically examined to detect gametes. The different stages of gonadal development are described according to Shafee, (1989). The gonad index was calculated by the equation IG = Σ(n × V)/N. Results indicated that G. demissa presents a continuous reproductive cycle, with mature, spawning animals occurring throughout the year. Two gametogenic processes occurred, one beginning during the dry season and extending until the onset of the rainy season, and another beginning during the rainy season and extending until late November, when the animals are once again mature. Two spawning peaks were observed, one in July and the other in December; 100% spawning in the population was not observed. Synchrony was found in spawning and maturation in both male and female mussels.
format	info:eu-repo/semantics/article
author	Báez, M García-de-Severeyn, Y Severeyn, H
author_facet	Báez, M García-de-Severeyn, Y Severeyn, H
author_sort	Báez, M
title	Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela
title_short	Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela
title_full	Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela
title_fullStr	Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela
title_full_unstemmed	Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela
title_sort	reproductive cycle of geukensia demissa (bivalvia: mytilidae) on a beach at nazaret, el moján, zulia state, venezuela
publisher	Iniversidad Autónoma de Baja California
publishDate	2005
url	https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/73
_version_	1792609852520923136

Reproductive cycle of Geukensia demissa (Bivalvia: Mytilidae) on a beach at Nazaret, El Moján, Zulia State, Venezuela

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