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Registros recuperados: 4
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Incidence de la pêche sur la biodiversité ichtyologique marine : le bassin d'Arcachon et le plateau continental sud Gascogne ArchiMer
Quero, Jean-claude; Cendrero, O.
Estimation of changes in the relative abundance of fish species in catches off Arcachon, on the shelf and in the Bassin d'Arcachon, from 1727 to the present day, shows that some previously dominant species are becoming scarce. Some are actually not caught now in the south of the Bay of Biscay. Among these are the large bottom-living elasmobranchs with low reproduction rates, such as Echinorhinus brucus, Squatina squatina, Raja batis, Raja brachyura, Dasyatis pastinaca, Myliobatis aquila, Galeorhinus galeus, Mustelus asterias, Raja clavata, ,.. and some actinopterygians, such as Trigla lyra, while catches of Eutrigla gurnardus are much reduced. Bottom trawling is principally responsible for these reductions but all fishing methods used there have...
Tipo: Text Palavras-chave: Species extinction; Fishing induced effects; Long term changes; Arcachon; France; ANE; Marine fishes.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/1996/publication-3793.pdf
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Macrophytes of Lake Victoria and succession after invasion of Water Hyacinth OceanDocs
Omondi, R.; Kusewa, Mwende.
The distribution of Lake Victoria (Kenya) macrophytes is described. Succession of macrophytes in the lake became more dramatic and dynamic after invasion of water hyacinth. The weed pushes and smothers other free-floating macrophytes like Pistia stratiotes. It then provides substrates for the emergent Vossia cuspidata, which later reduces its population by competition for light and nutrients. The noxious weed is believed to have led to extinction of Azolla nilotica in the lake.
Tipo: Proceedings Paper Palavras-chave: Aquatic plants; Ecological succession; Introduced species; Species extinction; Inland waters; Water reservoirs; Geographical distribution; Emergent vegetation; Competition; Water bodies; Aquatic plants; Water hyacinth; Http://aims.fao.org/aos/agrovoc/c_559; Http://aims.fao.org/aos/agrovoc/c_15267.
Ano: 2006 URL: http://hdl.handle.net/1834/1496
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Shifting baselines and the extinction of the Caribbean monk seal OceanDocs
Baisre, J. A..
The recent extinction of the Caribbean monk seal Monachus tropicalis has been considered an example of a human-caused extinction in the marine environment, and this species was considered a driver of the changes that have occurred in the structure of Caribbean coral reef ecosystems since colonial times. I searched archaeological records, historical data, and geographic names (used as a proxy of the presence of seals) and evaluated the use and quality of these data to conclude that since prehistoric times the Caribbean monk seal was always rare and vulnerable to human predation. This finding supports the hypothesis that in AD 1500, the Caribbean monk seal persisted as a small fragmented population in which individuals were confined to small keys, banks, or...
Tipo: Journal Contribution Palavras-chave: Marine mammals; Species extinction.
Ano: 2013 URL: http://hdl.handle.net/1834/5233
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The role of the Yala swamp lakes in conservation of Lake Victoria region haplochromine cichlids: evidence from molecular genetic and trophic ecology studies OceanDocs
Abila, R.; Salzburger, W.; Ndonga, M.F.; Owiti, D.O.; Barluenga, M..
Lake Kanyaboli (Kenya), a satellite lake of Lake Victoria, has been suggested as a potential refugium for haplochromine cichlids that have gone extinct in Lake Victoria. We employed mitochondrial DNA and microsatellite DNA molecular markers as well as feeding ecology studies to re- evaluate the evolutionary and ecological significance of Lake Kanyaboli haplochromines. The mitochondrial DNA and microsatellite markers revealed high genetic diversity in the endangered Xystichromis phytophagus and also the presence of mtDNA haplotypes that may have either gone extinct in Lake Victoria or have arisen in situ. Lake Kanyaboli thus acts as a ‘genetic reservoir’ for the Lake Victoria species flock. Gut content analysis revealed six trophic groups among the six...
Tipo: Proceedings Paper Palavras-chave: Tropical fish; Genetics; Swamps; Lakes; Resource conservation; Environment management; Rare resources; Resource management; Trophic relationships; Genetic diversity; Swamps; Inland waters; Water reservoirs; Freshwater lakes; Species extinction; Ecological efficiency; Genetics; Swamps; Lakes; Swamps; Inland waters; Water reservoirs; Species extinction; Resource conservation; Resource management; Http://aims.fao.org/aos/agrovoc/c_3222; Http://aims.fao.org/aos/agrovoc/c_7544; Http://aims.fao.org/aos/agrovoc/c_4160; Http://aims.fao.org/aos/agrovoc/c_7544; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_8324; Http://aims.fao.org/aos/agrovoc/c_17744; Http://aims.fao.org/aos/agrovoc/c_6523; Http://aims.fao.org/aos/agrovoc/c_6524.
Ano: 2006 URL: http://hdl.handle.net/1834/2130
Registros recuperados: 4
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