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27 novembre 2018
- doi: 10.4000/books.irdeditions.25253
- isbn: 9789492669100
- eisbn: 9782709924016
https://www.openedition.org/12554 , info:eu-repo/semantics/openAccess
Mots-clés
écologie biodiversité exploitation des ressources naturelles écosystème facteur anthropique évolution pisciculture eau continentale aquaculture faune ichtyologique hydrobiologie milieu lacustre biogéographie aquaculture biodiversity biogeography water ecology ecosystem evolution ressources exploitation anthropogenic factor hydrobiology Environmental Studies NAT011000 RNKSujets proches
Natural communities Biotic community ecology Biomes Ecological communities Ecosystems Communities, Biotic Community ecology, Biotic Biocoenoses Biological communities Biocenoses BiogeoecologyCiter ce document
Didier Paugy et al., « Fish communities in small aquatic ecosystems: caves, gueltas, crater and salt lakes », IRD Éditions, ID : 10.4000/books.irdeditions.25253
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Résumé
Small aquatic ecosystems generally have several and biological characteristics. Except for their size, they time, extreme ecosystems. For example, soda lakes have similar physical are, most of the very high salinity and/or alkalinity; crater lakes are deep with a low level of oxygen in the deep layers of the water; in gueltas and chotts, the water is perennial in only a few and the temperature is high; in caves, organisms live in permanent darkness. In relation with these severe conditions, fish have developed physiological and behavioural adaptations that allow them to survive and perpetuate. Thus, specific and usually endemic species inhabit these environments. In some cases, small species flocks exist, as can be observed in the Great Lakes of East Africa. Finally, most of these environments are vulnerable to even minor disturbances. Continued vigilance, protective measures and conservation recommendations must be a high priority to protect them from actual or potential local threats.