Adaptabilidad ecofisiológica de organismos acuáticos tropicales a cambios de salinidad / Ecophysiological adaptability of tropical water organisms to salinity changes
Rev. biol. trop
; Rev. biol. trop;49(1): 9-13, Mar. 2001.
Article
em Es
| LILACS
| ID: lil-321783
Biblioteca responsável:
BR1.1
ABSTRACT
Physiological response of tropical organisms to salinity changes was studied for some marine, estuarine and freshwater fishes (Astyanax bimaculatus, Petenia karussii, Cyprinodon dearborni, and Oreochromis mossambicus), marine and freshwater crustaceans (Penaeus brasiliensis, Penaeus schmitti and Macrobrachium carcinus), and marine bivalves (Perna perna, Crassostrea rhizophorae, and Arca zebra) collected from Northeast Venezuela. They were acclimated for four weeks at various salinities, and (1) placed at high salinities to determine mean lethal salinity, (2) tested by increasing salinity 5@1000 per day to define upper lethal salinity tolerance limit, or (3) observed in a saline gradient tank to determine salinity preference. Acclimation level was the most significant factor. This phenomenon is important for tropical aquatic organisms in shallow waters, where they can adapt to high salinity during the dry season and cannot lose their acclimation level at low salinity during abrupt rain. For saline adaptation of tropical organisms, this behavior will contribute to their proliferation and distribution in fluctuating salinity environments.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Adaptação Fisiológica
/
Bivalves
/
Crustáceos
/
Peixes
Limite:
Animals
País/Região como assunto:
America do sul
/
Venezuela
Idioma:
Es
Revista:
Rev. biol. trop
Assunto da revista:
BIOLOGIA
/
MEDICINA TROPICAL
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Venezuela
País de publicação:
Costa Rica