4 results on '"Morrocoy National Park"'
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2. Ictiofauna asociada a un arrecife somero en el Parque Nacional Morrocoy, Venezuela
- Author
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A López-Ordaz and J.G Rodríguez-Quintal
- Subjects
community structure ,reef fish ,spatial distribution ,Morrocoy National Park ,Venezuela ,estructura comunitaria ,ictiofauna arrecifal ,distribución espacial ,Parque Nacional Morrocoy ,Biology (General) ,QH301-705.5 - Abstract
Ichthyofauna associated to a shallow reef in Morrocoy National Park, Venezuela. Morrocoy National Park is one of the most studied coastal marine enviroments in Venezuela; however, efforts have been concentrated in south zone. In this study we select a shallow reef located in the north zone, characterized the benthic community and the structure of the fish community was studied using visual censuses. The benthic community was dominated by dead coral covered by algae (31%) and the live coral coverage was 12%. A total of 65 fish species belonging to 24 families were recorded, being Pomacentridae (43%), Scaridae (19%) and Haemulidae (15%) the most abundant families. Significant differences in the fish species abundances were found along the depth gradient, which could be related to the habitat characteristics, nevertheless herbivorous species dominance was evident at all depth strata. There seems to be a trend towards greater richness and density in the south zone reefs, and these differences may be related to the presence of extensive seagrass meadows and mangrove forests in that area or to differences in the recruitment patterns. Rev. Biol. Trop. 58 (Suppl. 3): 163-174. Epub 2010 October 01.
- Published
- 2010
3. Selectividad de presas de Coralliophila abbreviata y C. caribaea en arrecifes coralinos del Parque Nacional Morrocoy, Venezuela: una aproximación experimental Selectivity of preys of Coralliophila abbreviata and C. caribaea in coral reefs of the National Park Morrocoy, Venezuela: an experimental approximation
- Author
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Carlos del Mónaco, Estrella Villamizar, and Samuel Narciso
- Subjects
Coralliophila sp. ,coralívoro ,selectividad de presas ,arrecifes coralinos ,Parque Nacional Morrocoy ,Mar Caribe ,Venezuela ,corallivorous ,prey selectivity ,coral reef ,Morrocoy National Park ,Caribbean sea ,Aquaculture. Fisheries. Angling ,SH1-691 ,Oceanography ,GC1-1581 ,Biology (General) ,QH301-705.5 - Abstract
Se evaluó la selectividad de presas de Coralliophila abbreviata y C. caribaea en seis arrecifes coralinos del Parque Nacional Morrocoy (PNM), Venezuela, mediante métodos descriptivos y experimentales. Se estimó la abundancia y riqueza coralina, el número de Coralliophila spp. y su presa coralina mediante cuadratas aleatorias de 1 m² en tres sitios por cada arrecife . Se utilizaron ocho jaulas de exclusión de 1 m³ en cuyo interior se colocaron cinco colonias coralinas de diferentes especies, equidistantes a 10 individuos de C. abbreviata. Se observó una estrecha relación depredador-presa entre C. abbreviata y la hexacoralina Montastraea annularis, representando el 56,8% de todas las interacciones en todas las localidades, seguida por Diploria strigosa (19,3%), Agaricia agaricites (12,2%), Colpophyllia natans (4,6%) y A. tenuifolia (3,1%). C. caribaea exhibió una mayor afinidad con el octocoral Erythropodium caribaeorum (42,6%) y las hexacoralinas C. natans (24,1%), Montastraea faveolata (11,1%), Porites porites (7,4%) y D. strigosa (11,1%). De igual forma, el experimento mostró mayor asociación de C. abbreviata con M. annularis 53,3%, seguida por C. natans (17,8%), A. tenuifolia y D. strigosa (11,1% cada una) y A. agaricites (6,7%). Según estos resultados, C. abbreviata debería generar un mayor impacto que C. caribaea sobre el PNM debido a que sus presas más frecuentes están entre las principales formadoras de arrecife mientras que C. caribaea depredó mayormente a E. caribaeorum, la cual es competidora de hexacorales.Coralliophila abbreviata and C. caribaea are tropical gastropods of the Caribbean Sea. These gastropods have shown to be important corallivores. The objective of this work was to evaluate in situ the prey selectivity of C. abbreviata and C. caribaea in some coral reefs of Morrocoy National Park by means of experimental and descriptive methods. We used quadrats of 1 m² to estimate coral abundance and richness, number of Coralliophila specimens, and coral species preyed on by Coralliophila sp. in three sites at each locality. For the experiment, we enclosed in cages five coral colonies of different species together with 10 individuals of C. abbreviata located in the center of the cages and equidistant to all colonies. A total of 8 exclusion cages of 1 m³ were evaluated. We observed in situ a higher relation predator-prey between C. abbreviata and the hexacoral species M. annularis, representing 56.8% of the total interactions at all localities, followed by D. strigosa (19.3%), A. agaricites (12.2%), C. natans (4.6%) and A. tenuifolia (3.1%). C. caribaea presented a higher relation predator-prey with the octocoral species E. caribaeorum (42.6%), followed by those with the hexacoral species C. natans (24.1%), M. faveolata (11.1%), P. porites (7.4%) and D. strigosa (11.1%). The experiment showed a major relation between C. abbreviata and M. annularis, with 53.3% of total interactions, followed by those of C. natans (17.8%), A. tenuifolia and D. strigosa (11.1%) and A. agaricites (6.7%). According to the outcomes C. abbreviata is thought to generate a larger impact than C. caribaea on Morrocoy National Park because its more common preys are mainly coral reef building species while C. caribaea predate mainly on E. caribaeorum, which is a competitive species of hexacorals.
- Published
- 2010
4. Variabilidad temporal de la abundancia de Coralliophila abbreviata y Coralliophila caribaea (Mollusca, Coralliophilidae) en un arrecife coralino del Parque Nacional Morrocoy, Venezuela
- Author
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Carlos del Mónaco, Estrella Villamizar, and Samuel Narciso
- Subjects
Coralliophila sp ,coralívoros ,variabilidad temporal ,abundancia ,estructura de talla ,Parque Nacional Morrocoy ,corallivorous ,temporal variability ,abundance ,size structure ,Morrocoy National Park ,Biology (General) ,QH301-705.5 - Abstract
C. abbreviata y C. caribaea son moluscos coralívoros del Mar Caribe. Evaluamos la variabilidad temporal de la abundancia y los cambios en la estructura de talla de C. abbreviata y C. caribaea en Cayo Sombrero, Venezuela (septiembre 2004-agosto 2005). Se colocaron transectas fijas de 50 metros de longitud a profundidades de tres y seis metros cada una, paralelas a la costa. Se evaluó mensualmente durante un año la densidad de ambos depredadores y se seleccionaron 30 individuos de C. abbreviata para medirlos cada mes. Las densidades de C. abbreviata en la transecta somera fluctuaron entre 1.78 ind/m² en septiembre y 6.26 ind/m² en mayo; las densidades de C. abbreviata en la transecta profunda estuvieron comprendidas entre 4.23 ind/m² en enero y 7.66 ind/m² en mayo. Las densidades de C. caribaea fluctuaron en la transecta somera entre 0 ind/m² (todos los meses menos septiembre) y 0.03 ind/m² (septiembre) mientras que la transecta profunda fluctuó entre 0 ind/m² (octubre a marzo y julio) y 0.1 ind/m² (abril). La mayoría de los individuos de C. abbreviata midieron entre 12 y 16 mm de longitud. El largo de la mayoría de los individuos de C. caribaea estuvo comprendido entre 10 y 15 mm.Temporary abundance variation of Coralliophila abbreviata and Coralliophila caribaea (Mollusca, Coralliophilidae) in a coral reef at Morrocoy National Park. The mollusks Coralliophila abbreviata and C. caribaea are coral predators in the Caribbean Sea . We evaluated the temporal variability of abundance and size structure of C. abbreviata and C. caribaea in Cayo Sombrero, Morrocoy National Park, Venezuelar (September 2004 - August 2005). The density of C. abbreviata and C. caribaea was evaluated monthly by means of two 50- meter long transects paralell to the coast line, at 3 m and 6 m deep; aditionally, 30 individuals of C. abbreviata were collected to measure size. The densities of C. abbreviata at the shallow transect fluctuated between 1.78 ind/m² in September and 6.26 ind/m² in May. The densities at the deep transect fluctuated between 4.23 ind/m² in January and 7.66 ind/m² in May. The densities of C. caribaea at the shallow transect fluctuated between 0 ind/m2 (except in September) and 0.03 ind/m² (September) and the densities at the deep transect fluctuated between 0 ind/m² (October to March and July) and 0.1 ind/m² (April). Most individuals of C. abbreviata and C. caribaea measured between 12 and 16 mm and between 10 and 15 mm long respectively. Rev. Biol. Trop. 56 (2): 501-511. Epub 2008 June 30.
- Published
- 2008
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