Selection of diving strategy by Antarctic fur seals depends on where and when foraging takes place
نویسندگان
چکیده
منابع مشابه
The influence of preceding dive cycles on the foraging decisions of Antarctic fur seals.
The foraging strategy of many animals is thought to be determined by their past experiences. However, few empirical studies have investigated whether this is true in diving animals. We recorded three-dimensional movements and mouth-opening events from three Antarctic fur seals during their foraging trips to examine how they adapt their behaviour based on past experience--continuing to search fo...
متن کاملSkin temperatures during free-ranging swimming and diving in antarctic fur seals.
This study tests the hypothesis that an endothermic homeotherm should minimise heat flux in cold polar waters by minimising skin temperature. Temperature variability was measured at the surface of the skin of three Antarctic fur seals (Arctocephalus gazella) at intervals of 2 s over a total of 9.7 days while they were swimming and diving freely in polar waters at temperatures of 1.5-4 degrees C...
متن کاملAscent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving?
Novel observations collected from video, acoustic and conductivity sensors showed that Antarctic fur seals consistently exhale during the last 50-85% of ascent from all dives (10-160 m, n > 8000 dives from 50 seals). The depth of initial bubble emission was best predicted by maximum dive depth, suggesting an underlying physical mechanism. Bubble sound intensity recorded from one seal followed p...
متن کاملUtilisation of Intensive Foraging Zones by Female Australian Fur Seals
Within a heterogeneous environment, animals must efficiently locate and utilise foraging patches. One way animals can achieve this is by increasing residency times in areas where foraging success is highest (area-restricted search). For air-breathing diving predators, increased patch residency times can be achieved by altering both surface movements and diving patterns. The current study aimed ...
متن کاملReproductive success is energetically linked to foraging efficiency in Antarctic fur seals
The efficiency with which individuals extract energy from their environment defines their survival and reproductive success, and thus their selective contribution to the population. Individuals that forage more efficiently (i.e., when energy gained exceeds energy expended) are likely to be more successful at raising viable offspring than individuals that forage less efficiently. Our goal was to...
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ژورنال
عنوان ژورنال: Marine Ecology Progress Series
سال: 2010
ISSN: 0171-8630,1616-1599
DOI: 10.3354/meps08611