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Mollusk Community of the Punta De Piedras Coastal Lagoon System, Isla De Margarita, Venezuela

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Mollusk Community of the Punta De Piedras Coastal Lagoon System, Isla De Margarita, Venezuela Page 512 62nd Gulf and Caribbean Fisheries Institute Mollusk Community of the Punta de Piedras Coastal Lagoon System, Isla de Margarita, Venezuela FRANCIS MASS1 and JUAN C. CAPELO2 1Wildlife Conservation Society, Fundación la Salle de Ciencias Naturales, Estación de Investigaciones Hidrobiológicas de Guayana, San Félix, Bolívar, Venezuela. 2Estación de Investigaciones Marinas de Margarita, Fundación La Salle de Ciencias Naturales, Isla de Margarita, Punta de Piedras, Nueva Esparta, Venezuela ABSTRACT In this work we argue the richness, abundance, and distribution of the mollusks community from the Punta de Piedras coastal Lagoon system, Southern Isla de Margarita, Nueva Esparta state, Venezuela. The specimens were collected using dredges, PVC nucleuses, sieves, spatulas, tweezers, plastic bags, and by hand. Sampled habitats were realized mainly on streams and secondary canals and mangrove roots, submerged trunks, soft funds, artificial rocky coasts and Thalassia testudinum meadows. We collected 2467 specimens, distributed in 59 families, 87 genera and 131 species, representatives of the classes Bivalvia, Gastropoda, Polyplacophora and Cephalopoda. The gastropods were the dominant class with 71 species, being Bulla striata the most common species, found in all localities visited. The most abundant species were Persicula interruptolineata, Littorina lineolata, Crepidula plana, Chione cancellata and Crassostrea rhizophorae. The most richness habitat was the rocky shores (58 species) and sandy bottom (57 species). We report as new records for Nueva Esparta state the gastropods Cerithiopsis greeni, Agathotoma badia, and Turbonilla pyrrha. We identified four trophy groups (carnivorous, herbivorous, suspensivores and organic particles consumers), of which the suspensivores and carnivores accounted 70% of all species. The most important species used as resource subsistence by local people were Crassostrea rhizophorae, Perna viridis, P. perna, Melongena melongena, Trachycardium isocardia, T. muricatum, Chione cancellata, Fasciolaria tulipa, and Octopus sp. The factors that determined the richness and distribution species were the diversity of substrates and hydrologic conditions in the different habitats. KEY WORDS: Marine mollusks, coastal lagoon, biodiversity, Isla de Margarita, Venezuela Comunidad de Moluscos del Sistema Litoral Laguna de Punta de Piedras, Isla de Margarita, Venezuela En el presente trabajo se analizan la riqueza, abundancia y distribuciñn de la comunidad de moluscos del sistema litoral laguna de punta de piedras, ubicado en la costa sur de la isla de margarita, estado nueva esparta, venezuela. Los ejemplares se capturaron de por medio de dragas tipo hydrobios, nucleadores de pvc, tamices, espátulas, pinzas, bolsas plásticas y a mano. Los habitat muestreados fueron los caðos principales y secundarios, raíces y troncos de mangle, troncos sumergidos, fondos blandos, costas rocosas artificiales y praderas de Thalassia testudinum. Se capturaron 2467 ejemplares, distribuidos en 59 familias, 87 géneros y 131 especies, representantes de las clases bivalvia, gastrñpoda, polyplacophora y cephalopoda. Los gasterñpodos fueron la clase dominante con 71 especies, siendo Bulla striata la especie de mayor distribuciñn, encontrándose en todas las localidades. Las especies más abundantes fueron Persicula interruptolineata, Littorina lineolata, Crepidula plana, Chione cancellata y Crassostrea rhizophorae. La mayor riqueza específica se encontrñ en costas rocosas (58 especies) y fondos blandos (57 especies). Se citan como nuevos registros para el estado nueva esparta a los gasterñpodos Cerithiopsis greeni, Agathotoma badia y Turbonilla pyrrha. Se identificaron cuatro grupos trñficos (carnívoros, herbívoros, suspensívoros y consumidores de partículas orgánicas), de los cuales las especies filtradoras suspensívoras y los carnívoros representaron el 70 % de todas las especies. Las especies más importantes utilizadas como recurso de subsistencia por los pobladores locales fueron Crassostrea rhizophorae, Perna viridis, P. perna, Melongena melongena, Trachycardium isocardia, T. muricatum, Chione cancellata, Fasciolaria tulipa y Octopus sp. En general los factores que determinaron la riqueza y distribuciñn de las especies fueron la diversidad de sustratos y las condiciones hidrográficas en los diferentes habitat. PALABRAS CLAVES: Moluscos marinos, lagunas costeras, biodiversidad, Isla de Margarita Venezuela Communaute de Mollusques du Système de la Lagune Côtièr de Punta de Piedras, Isla de Margarita, Venezuela Dans ce travail, nous soutenons la richesse, l'abondance et la distribution de la Communauté des mollusques du système de la lagune côtière de Punta de Piedras, dans le sud Isla de Margarita, Nueva Esparta, au Venezuela. Les spécimens ont été recueillis au moyen de dragues, noyaux en PVC, tamis, spatules, pinces, sacs en plastique et les mains. Les habitats échantillonnés ont été réalisés principalement sur les ruisseaux et les canaux secondaires, les racines de mangrove, les troncs immergés, les fonds mous, les côtes rocheuses artificielles et les prairies Thalassia testudinum. Nous avons recueilli 2467 spécimens, répartis en 59 familles, 87 genres et 131 espèces, des représentants des classes Bivalvia, Gastropoda, Polyplacophora et céphalopodes. Les gastéropodes étaient la classe dominante, avec 71 espèces, Bulla striata étant l'espèce la plus commune, dans toutes les localités visitées. Les espèces les plus abondantes ont été Persicula interruptolineata, Littorina lineolata, Crepidula plana, Chione cancellata Y Crassostrea rhizophorae. Les habitats avec le plus de richesse ont été les rivages rocheux (58 espèces) et de fond de sable (57 espèces). Nous signalons comme nouveaux enregistrements pour l'état de Nueva Esparra les gastéropodes Cerithiopsis greeni, Agathotoma badia et Pyrrha turbonilla. Quatre groupes trophée ont été identifiés (carnivores, herbivores, et suspensivores et consommateurs de particules organiques), dont les suspensivores et les carnivores ont représenté 70% de toutes les espèces. Les espèces les plus importantes Proceedings of the 62nd Gulf and Caribbean Fisheries Institute November 2 - 6, 2009 Cumana, Venezuela Poster Session Abstracts GCFI:62 (2010) Page 513 utilisées en tant que ressource de subsistance par les populations locales ont été Crassostrea rhizophorae, Perna viridis, P. perna, Melongena melongena, Trachycardium isocardia, T. muricatum, Chione cancellata, Fasciolaria tulipa et Octopus sp. Les facteurs qui déterminent la richesse et la répartition des espèces ont été la diversité de substrats et les conditions hydrologiques dans les différents habitats. MOTS CLÉS: Mollusques marins, lagunes côtières, biodiversité, Isla de Margarita, Venezuela Abundance and Distribution of Queen Conch (Strombus gigas) Veligers of Quintana Roo, Peninsula de Yucatan, Mexico MONTESSERRAT BRAVO, DALILA ALDANA ARANDA, and JORGE MONTERO 1CINVESTAV IPN, km 6 antigua Carretera a Progreso Mèrida, Yucatan, Mèxico ABSTRACT In order to study the distribution and abundance of Strombus gigas (Lineé 1758) larvae were collected every month from January 2005 to December 2005 in Quintana Roo. Plankton tows were made with a conical net of 500 µm mesh-size. During the sample period, 417 veliger were identifying. Larvae were more abundant during August, with 179 larvae (42.9%) and they were lest abundant in April, with 16 larvae (3.83 %). Small larvae (200 to 320 µm) were more abundant in August. Analysis of Correspond- ence GLM was different significantly between months (p = 0.005388). High abundance of small sizes of larvae suggests that Quintana Roo North area could be a possible site of production of Strombus gigas larvae. It could be related to presence of an adult stock at Puerto Morelos, in the Quintana Roo North area in the Yucatan Peninsula of Mexico. KEY WORDS: Distribution, abundance, larvae, Strombus gigas, Mexico Abundancia y Distribuciñn de Larvas del Caracol Rosa (Strombus gigas) en la Peninsula de Yucatán, Quintana Roo, México En la zona norte de la península de Yucatán, estado de quintana roo, México se realizaron muestreos mensuales de enero a diciembre del 2005 para determinar la abundancia y la distribuciñn de larvas del caracol rosa Strombus gigas (Lineé 1758). Las muestras de plancton se colectaron por medio de arrastres con una red neuston 60 x 80 con luz de malla de 500 ųm y con una duraciñn de 15 minutos en superficie. Se identificaron un total de 2100 larvas de gasterñpodos y 417 larvas de Strombus gigas. No se encontraron larvas de S. costatus. La mayor abundancia se presentñ en el mes de agosto con 179 larvas y la menor en abril con 16 larvas. Las larvas de mayor talla (≥ 500 ųm) se encontraron en septiembre y diciembre y las de menor talla se observaron en los meses de julio y agosto (200 - 320 ųm). Con una prueba de kruskal wallis (p = 0.05388) se encontrñ diferencia significativa entre el numero de larvas entre meses, siendo agosto diferente. Lo mismo se observñ para la talla de las larvas, donde agosto fue diferente, con larvas de tallas menores del resto de los meses analizados. Estos resultados muestran que el norte de quintana roo en la península de Yucatán, México presenta una poblaciñn de larvas todo el aðo, con un pico en verano, lo que indica que esta zona es una área de producciñn in situ de s. gigas, posiblemente perteneciente a un stock de adultos presentes en puerto morelos. Sin embargo no existe monitoreos sobre la abundancia de la poblaciñn adulta el la zona norte de la península de
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