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| García, S.; López-Victoria, M.. |
| Se evaluó la ecología trófica del Piquero de Nazca (Sula granti) en la Isla Malpelo (Pacífico colombiano), mediante el análisis de contenidos estomacales colectados entre septiembre de 2004 y julio de 2005 durante cinco salidas de campo. A partir de 110 regurgitos inducidos se analizó la dieta, utilizando las variables número, peso y frecuencia de ocurrencia de las diferentes categorías alimentarias y utilizando la distribución de las frecuencias de los tamaños de las presas a nivel general, intraespecífico y temporal. Oxyporrhamphus micropterus (peces mediospicos, familia Hemiramphidae) y peces de la familia Exocoetidae (voladores) fueron los principales componentes hallados en la dieta, seguidos por peces de las familias Carangidae y Escombridae. Se... |
| Tipo: Journal Contribution |
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| Ano: 2007 |
URL: http://hdl.handle.net/1834/3482 |
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| Chaves-Fonnegra, A.; López-Victoria, M.; Parra-Velandia, F.; Zea, S.. |
| The Caribbean encrusting and excavating sponges Cliona aprica, C. caribbaea, C. delitrix and C. tenuis (Porifera, Hadromerida, Clionaidae), aggresively undermine and displace live coral tissue. At San Andrés island and Islas del Rosario (Colombian Caribbean), in all 145 observed cases of direct contact of the sponges C. aprica, C. caribbaea and C. tenuis with 17 coral species, corals showed unhealthy signs in their tissue. It was also noticed that the surface of these sponges is colonized by few organisms and that they are rarely preyed upon. To establish the possible use of chemical substances by these sponges in competition for space with corals (allelopathy), as inhibitors of larval settlement (antifouling), and as feeding deterrents against generalist... |
| Tipo: Journal Contribution |
Palavras-chave: Sponges; Coral; Ecology; Competitive behaviour; Associated species; Antifouling substances; Ecology; Sponges; Http://aims.fao.org/aos/agrovoc/c_2467; Http://aims.fao.org/aos/agrovoc/c_7321. |
| Ano: 2005 |
URL: http://hdl.handle.net/1834/1990 |
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| López-Victoria, M.; Díaz, J.M.; Márquez, J.C.. |
| Tortuguilla is a small island off the southern portion of the Colombian Caribbean continental coast. It is surrounded by a shallow calcareous shelf which is overgrown by recent coral formations whose distribution, composition and zonation are herewith qualitative described for the first time. Observations and data collecting were conducted during two days from a boat by snorkeling at 63 stations and along manta tow transects. Despite the reduced area and the adverse turbidity and sedimentation conditions, at least 16 species of stony corals were registered (4 more to be confirmed), being Millepora spp. and Siderastrea siderea the most common. Five different coral assemblages were recognized. |
| Tipo: Journal Contribution |
Palavras-chave: Coral reefs; Composition; Coral reefs; Http://aims.fao.org/aos/agrovoc/c_1880. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/3240 |
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| Márquez, J.C.; Zea, S.; López-Victoria, M.. |
| Temperaturas del agua de mar por encima del promedio durante 2005 en el Archipiélago de las Islas del Rosario (Caribe Colombiano) causaron un blanqueamiento coralino masivo en aguas someras (hasta 2-3 m de profundidad). Para confirmar resultados previos en los que el estrés inducido por calentamiento del agua en los corales puede acelerar la velocidad a la que esponjas excavadoras incrustantes le ganan espacio a los corales vivos, se contrastaron las tasas de propagación lateral en individuos de la esponja Cliona tenuis previamente marcados, que estaban colonizando los corales Diploria strigosa y Siderastrea siderea a profundidades de 5 - 6 m. Se hicieron comparaciones pareadas del avance de cada individuo de esponja entre dos intervalos de medida... |
| Tipo: Journal Contribution |
Palavras-chave: Sponges; Coral; Competitors; Associated species; Temperature effects; Sponges; Http://aims.fao.org/aos/agrovoc/c_7321. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1987 |
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| López-Victoria, M.; Rozo, D.M.. |
| The spatial distribution of seabird nests present on Malpelo Island, the main characteristics of the islandʼs topography, and the types of substratum available for nesting were addressed using a Digital Elevation Model (DEM). The model is based on data from remote sensors (satellite images, aerial photography and panoramic photography), and from field data processed through a geographical information system. The nests of Sula granti prevail on the surfaces of Malpelo Island and neighboring islets, while those of the remaining species (S. sula, Creagrus furcatus, Anous stolidus, A. minutus and Gygis alba) are spatially restricted to the cliff margins and to crevices or caverns at different heights. The presence of terrestrial predators and predatory birds... |
| Tipo: Journal Contribution |
Palavras-chave: Marine birds; Nests; Geographical distribution; Geographical distribution; Http://aims.fao.org/aos/agrovoc/c_5083. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1970 |
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