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vol.73 issue3Trophic ecology of the oystercatchers Haematopus palliatus pitanay (Murphy 1925) and Haematopus ater (Vieillot et Oudart 1825) on beds of the tunicate Pyura praeputialis (Heller 1878) in the Bay of Antofagasta, ChilePhysiological performance, seasonality and phenotypic plasticity in small mammals: microevolution of change capacity in thermoregulatory characters author indexsubject indexarticles search
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Revista chilena de historia natural

Print version ISSN 0716-078X


ROJAS, JOSE MIGUEL; FARINA, JOSE MIGUEL; SOTO, RUBEN E.  and  BOZINOVIC, FRANCISCO. Geographic variability in thermal tolerance and water economy of the intertidal gastropod Nodilittorina peruviana. (Gastropoda: Littorinidae, Lamarck, 1822). Rev. chil. hist. nat. [online]. 2000, vol.73, n.3, pp.543-552. ISSN 0716-078X.

The gastropod Nodilittorina peruviana inhabit rocky intertidal of the north and center Chile. Populations of this species exhibits aggregated distributions. Through field and lab records we studied the effect of spatial distribution of snails on their thermoregulatory and water conservation efficiencies. We studied individuals from two localities of the Chilean coast with different climatic conditions (Taltal 25° 25 ` S; 70° 29 ` W and Las Cruces 33° 35 ` S; 71° 38 ` W). Results indicate that the influence of spatial distribution thermoregulatory efficiency is dependent of the local conditions. Although individuals from both localities presented similar thermal tolerances, snails from Taltal showed lower rates of water loss. Aggregations size were negatively related with the rate of water loss in individuals from both localities. Only, individuals from Taltal decreased their limit of thermal tolerance, and exhibited a positive relationship between aggregation size and the temperature of the group. Results demonstrated that the local environmental conditions are determinate thermoregulatory strategies.

Keywords : ntertidal; gastropods; thermoregulation; aggregation; biogeography.

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