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  • Biodiversity  (3)
  • Nature Publishing Group  (1)
  • Universidad Nacional. Facultad de Ciencias Exactas y Naturales. Escuela de Biología  (1)
  • Université de Nice-Sophia Antipolis  (1)
  • 2010-2014  (3)
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  • 1
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    Université de Nice-Sophia Antipolis
    Publication Date: 2021-05-19
    Description: Biodiversity is a holistic concept which encompasses what the scientific literature describes as inter-specific diversity (diversity between species), intra-specific diversity (genetic diversity) and diversity of ecosystems. As a support of life, the preservation of biodiversity in terrestrial and marine habitats is of primary importance for the ecological balance of the Earth. Moreover, it is essential for human beings whose lifestyle depends on nature. The value of biodiversity lies with the opportunities provided to mankind to adapt to a changing environment. Concerning specifically the seas and oceans that constitute ¾ of the planet and 90% of the biosphere, there is a renewed ‘ecological awareness’ at the global level on the need to preserve marine living resources to enable them to continue to generate goods and services for mankind. The urgency to curb the continuous depletion of marine and coastal biodiversity is supported by the facts that the aquatic living resources are not inexhaustible and that damages caused to the marine milieu might be irreversible. Within this broad context, it seemed important to focus on the situation of the coastal States of the Gulf of Guinea for at least two reasons. Firstly, this region is an aquatic biodiversity hotspot whose health is a source of preoccupation not only for the region but for the world at large. Secondly, the region is witnessing an ecological stress with negative outcomes not only on the marine environment but also in the social and economic domains (shortages of sea proteins, loss of revenues derived from fisheries etc.). Thus, the key challenge that lies upon the States of the region is to ensure the optimal preservation of their coastal and marine resources, while exploiting the latter in a sustainable manner in order to drive their national development processes. The analysis of the environmental normative and institutional corpus put in place by those States, both at regional and national levels, shows that the governance framework of marine and coastal biodiversity has still to be adapted to the stakes and challenges it faces. Despite their diversity, the governance mechanisms in the Gulf of Guinea are yet to generate optimal results in terms of ensuring the conservation and sustainable exploitation of living aquatic resources. The declining trend in the loss of marine and coastal species and ecosystems within the region calls therefore for renewed impetus and strategies for an efficient regulation of the Gulf of Guinea’s aquatic patrimony which is so important for the region, and the world at large.
    Description: The United Nations – The Nippon Foundation of Japan Fellowship Programme 2008-2009
    Description: Unpublished
    Description: terrestrial habitats, marine habitats, ecological balance
    Keywords: Marine ecology ; Marine resources ; Biodiversity
    Repository Name: AquaDocs
    Type: Theses and Dissertations , Master thesis
    Format: 175pp.
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  • 2
    Publication Date: 2022-05-25
    Description: © The Author(s), 2013. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Scientific Reports 3 (2013): 2802, doi:10.1038/srep02802.
    Description: It is usually assumed that metabolic constraints restrict deep-sea corals to cold-water habitats, with ‘deep-sea’ and ‘cold-water’ corals often used as synonymous. Here we report on the first measurements of biological characters of deep-sea corals from the central Red Sea, where they occur at temperatures exceeding 20°C in highly oligotrophic and oxygen-limited waters. Low respiration rates, low calcification rates, and minimized tissue cover indicate that a reduced metabolism is one of the key adaptations to prevailing environmental conditions. We investigated four sites and encountered six species of which at least two appear to be undescribed. One species is previously reported from the Red Sea but occurs in deep cold waters outside the Red Sea raising interesting questions about presumed environmental constraints for other deep-sea corals. Our findings suggest that the present understanding of deep-sea coral persistence and resilience needs to be revisited.
    Keywords: Ecosystem ecology ; Biodiversity ; Genetics ; Metabolism
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Format: application/msword
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  • 3
    Publication Date: 2021-05-19
    Description: El buceo contemplativo en los arrecifes coralinos es una de las pocas actividades autorizadas en el área manejada por el Centro Internacional de Buceo María la Gorda del Parque Nacional Guanahacabibes. Se evaluó la composición y estructura de las asociaciones de peces en los arrecifes utilizados por el Centro Internacional de Buceo María la Gorda. Considerando la posibilidad de cambios estacionales en la densidad y composición de los peces, se realizaron muestreos en las épocas seca y lluviosa. Se realizaron censos visuales en ocho sitios de buceo (12 transectos de 50 x 2 m en cada uno), en dos biotopos característicos del arrecife. Se estimaron los índices de diversidad, equitatividad, riqueza de especies, densidad y biomasa de peces. Los valores de densidad promedio y los índices de diversidad por estaciones no mostraron diferencias significativas entre las épocas. Se registraron 134 especies en toda el área. La abundancia de peces fue superior en los sitios de mayor complejidad estructural, correspondientes a la zona de camellones de la pendiente arrecifal. Se observó un predominio de peces de pequeña talla y pobre presencia de peces de mediana y gran talla. Las familias con mayor densidad fueron Pomacentridae y Labridae, y las de mayor biomasa Lutjanidae y Labridae. La estructura trófica estuvo dominada por los plantófagos y omnívoros. Aunque se observaron carnívoros de tallas medianas, su densidad fue inferior al resto de los grupos, lo cual parece ser consecuencia de la pesca furtiva.
    Description: Recreational SCUBA diving on the coral reefs is one of the few activities allowed in the area managed by the Centro Internacional de Buceo María la Gorda at the Guanahacabibes National Park. The composition and structure of fish associations were evaluated on the reefs visited by users of the diving center. To assess possible seasonal changes in fish community densities and composition surveys were carried during the dry and rainy seasons. Visual censuses were carried out at eight diving sites comprising two characteristic reef biotopes. Indices for diversity, evenness, species richness, density, and fish biomass were estimated. Mean density values by sampling site did not show significant differences between seasons. A total of 134 species were recorded in the area. Fish abundances were greater in sites of higher structural complexity, matching areas of ridges on the reef slope. Prevalence of small-sized fish and a general poor presence of medium to high-sized fish were observed. Fish families with the higher densities were Pomacentridae and Labridae, and those with the higher biomass were Lutjanidae and Labridae. The trophic structure was dominated by phytophagous and omnivorous fish. Medium-sized carnivorous fish were observed, however, their densities were much lower than for the rest of the trophic groups, which could be a consequence of illegal fishing activities.
    Description: Published
    Description: biodiversidad, diversidad, arrecifes coralinos, asociaciones de peces
    Keywords: Coral reefs ; Biodiversity ; Fisheries organizations ; Coral reefs
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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