Killer whales in Chilean Patagonia: additional sightings, behavioural observations, and individual identifications
نویسندگان
چکیده
منابع مشابه
Behavioural responses of killer whales (Orcinus orca) to whale-watching boats: opportunistic observations and experimental approaches
Johnstone Strait provides important summer habitat for the northern resident killer whales Orcinus orca of British Columbia. The site is also an active whale-watching area. A voluntary code of conduct requests that boats do not approach whales closer than 100 m to address perceived, rather than demonstrated, effects of boat traf®c on killer whales. The purpose of the study was to test the relev...
متن کاملAutomatic identification of individual killer whales.
Following the successful use of HMM and GMM models for classification of a set of 75 calls of northern resident killer whales into call types [Brown, J. C., and Smaragdis, P., J. Acoust. Soc. Am. 125, 221-224 (2009)], the use of these same methods has been explored for the identification of vocalizations from the same call type N2 of four individual killer whales. With an average of 20 vocaliza...
متن کاملLoss of Arctic sea ice causing punctuated change in sightings of killer whales (Orcinus orca) over the past century.
Killer whales (Orcinus orca) are major predators that may reshape marine ecosystems via top-down forcing. Climate change models predict major reductions in sea ice with the subsequent expectation for readjustments of species' distribution and abundance. Here, we measure changes in killer whale distribution in the Hudson Bay region with decreasing sea ice as an example of global readjustments oc...
متن کاملNiche Segregation between Wild and Domestic Herbivores in Chilean Patagonia
Competition arises when two co-occuring species share a limiting resource. Potential for competition is higher when species have coexisted for a short time, as it is the case for herbivores and livestock introduced in natural systems. Sheep, introduced in the late 19(th) century in Patagonia, bear a great resemblance in size and diet to the guanaco, the main native herbivore in Patagonia. In su...
متن کاملKiller whales and whaling: the scavenging hypothesis.
Killer whales (Orcinus orca) frequently scavenged from the carcasses produced by whalers. This practice became especially prominent with large-scale mechanical whaling in the twentieth century, which provided temporally and spatially clustered floating carcasses associated with loud acoustic signals. The carcasses were often of species of large whale preferred by killer whales but that normally...
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ژورنال
عنوان ژورنال: Revista de biología marina y oceanografía
سال: 2013
ISSN: 0718-1957
DOI: 10.4067/s0718-19572013000100007