IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
artículos
Título:
Digestive flexibility in the euryhaline crab Cyrtograpsus angulatus (Decapoda, Brachyura, Varunidae) from Mar Chiquita coastal lagoon (Buenos Aires, Argentina): responses to salinity of key enzymes in hepatopancreas
Autor/es:
PINONI,S.A.; LÓPEZ MAÑANES, A,A.
Revista:
Pan-American Journal of Aquatic Sciences
Editorial:
Pablo Muniz
Referencias:
Año: 2016 vol. 11 p. 345 - 355
ISSN:
1809-9009
Resumen:
Abstract: In Mar Chiquita coastal lagoon (Argentina) Cyrtograpsus angulatus is one of thedominant intertidal euryhaline crabs having an important ecological role. However, studies ondigestive physiology and flexibility (i.e. occurrence and modulation of key digestive enzymes)are lacking. We determined the occurrence and characteristics of alkaline phosphatase (AP)activity in hepatopancreas and studied the responses to low salinity at short and long-term afterfeeding of AP and proteolytic activities in hepatopancreas. The hepatopancreas exhibited alevamisole-insensitive and a levamisole-sensitive AP activity with distinct biochemicalcharacteristics. In crabs acclimated to 10 psu (hyper-regulation conditions), levamisoleinsensitiveAP activity decreased at long term (48 h) after feeding, while no changes occurred incrabs acclimated to 35 psu (osmoconforming conditions). No changes occurred in levamisolesensitiveAP activity at any salinity tested. In 35 psu, proteolytic activity decreased at short termafter feeding (2- 4 h) while no changes were found in 10 psu. The different responses afterfeeding of levamisole-insensitive AP and proteolytic activities of hepatopancreas at 10 and 35psu, suggest a role of these activities in digestive and metabolic adjustments underlyingbiochemical adaptation to environmental salinity