B. Project Summary- Task 7.2 Diving Metabolism of Southern Sea Lions

RODRÍGUEZ, D; DASSIS, M; DAVIS, R W

2007-06-01/2008-02-28

Biológica

Otros campos

This study focuses on measuring the energetic cost of submerged swimming in captive, trained southern sea lions (Otaria flavescens) using open flow respirometry. Energetic costs associated with locomotion and prey warming and assimilation will be measured, and the contribution of these costs to the total energetic demands of foraging determined. Using these results, we will develop an energetic model to predict the cost of a dive by sea lions based on stroking costs in the post-absorptive and post-prandial conditions. Complementary to the experimental studies, in May 2007 we began a study of the at-sea foraging activity of sea lions instrumented with satellite-linked telemeters. The main objective is to determine the foraging ranges, movements and diving patterns of lactating females and juvenile Southern sea lions using the rookeries at Isla de Lobos (Uruguay). The area is currently administered by the National Direction of Aquatic Resources (DINARA), and the activities will be performed under permits given in November 2006 (DINARA Permit # A7009/2006; Resolution of the Ministry of Agriculture and Fisheries of Uruguay # 001/1383/2007).