ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Migratory connectivity  (1)
  • Scars  (1)
Collection
Keywords
Publisher
Years
  • 1
    facet.materialart.
    Unknown
    Baleen whales are not important as prey for killer whales Orcinus orca in high-latitude regions (2011)
    Inter-Research
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Inter-Research, 2007. This article is posted here by permission of Inter-Research for personal use, not for redistribution. The definitive version was published in Marine Ecology Progress Series 348 (2007): 297-307, doi:10.3354/meps07015.
    Description: Certain populations of killer whales Orcinus orca feed primarily or exclusively on marine mammals. However, whether or not baleen whales represent an important prey source for killer whales is debatable. A hypothesis by Springer et al. (2003) suggested that overexploitation of large whales by industrial whaling forced killer whales to prey-switch from baleen whales to pinnipeds and sea otters, resulting in population declines for these smaller marine mammals in the North Pacific and southern Bering Sea. This prey-switching hypothesis is in part contingent upon the idea that killer whales commonly attack mysticetes while they are in these high-latitude areas. In this study, we used photographic and sighting data from long-term studies of baleen whales in 24 regions worldwide to determine the proportion of whales that bear scars (rake marks) from killer whale attacks, and to examine the timing of scar acquisition. The results of this study show that there is considerable geographic variation in the proportion of whales with rake marks, ranging from 0% to 〉40% in different regions. In every region, the great majority of the scars seen were present on the whales’ bodies when the animals were first sighted. Less than 7% (9 of 132) of scarred humpback whales with multi-year sighting histories acquired new scars after the first sighting. This suggests that most killer whale attacks on baleen whales target young animals, probably calves on their first migration from low-latitude breeding and calving areas to high-latitude feeding grounds. Overall, our results imply that adult baleen whales are not an important prey source for killer whales in high latitudes, and therefore that one of the primary assumptions underlying the Springer et al. (2003) prey-switching hypothesis (and its purported link to industrial whaling) is invalid.
    Description: This study was supported in part by funding from the Marine Mammal Commission.
    Keywords: Predation ; Killer whale ; Baleen whale ; Scars ; North Pacific ; Whaling
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 2
    facet.materialart.
    Unknown
    Conexión migratoria entre zonas de cría del Pacífico Este y áreas de alimentación en la Península Antártica basado en coincidencias de genotipos individuales (2021)
    Details
    Publication Date: 2021-11-10
    Description: En este estudio, se analizaron 114 muestras de ADN colectadas en diferentes localidades en la zona de reproducción de la población G (stock G), incluyendo la costa de Ecuador y localidades en el norte y sur del Pacífico colombiano, así como muestras obtenidas en la primera expedición científica colombiana a la Antártica en el estrecho de Gerlache. Se genotipificaron 15 loci microsatellites y se realizaron comparaciones de los genotipos obtenidos. Para estas comparaciones se utilizó una base de datos genéticos de individuos tanto en zonas de reproducción de Colombia y la zona de alimentación alrededor de la península Antártica. Se confirmó la conectividad existente entre las zonas de alimentación alrededor de la península Antártica y las zonas de reproducción en Colombia y Ecuador utilizando marcadores microsatélites. Se encontraron recapturas entre localidades en un mismo año, pero también se obtuvieron algunas recapturas en una misma localidad entre años diferentes, tanto en zonas de reproducción como de alimentación. Se encontraron recapturas de individuos en muestras colectadas con 20 años de diferencia, dando información preliminar sobre la longevidad de los animales de esta población.
    Description: We analysed 114 DNA samples collected in different locations within the stock G breeding grounds, including Ecuador and the northern and southern Pacific of Colombia. We genotyped 15 microsatellite loci, sexed all samples, and performed genotype comparisons. Genotype comparisons were done using a DNA register of previously genotyped individuals from the Colombian breeding ground and the Antarctic Peninsula feeding Area. We confirmed connectivity between feeding grounds in Antarctic Peninsula and breeding grounds in Colombia and Ecuador using microsatellite loci. We found recaptures within each sampling location in the same year, but we also found a few recaptures in the same locations between years both in breeding and feeding grounds. Interestingly, we found recaptures between breeding and feeding grounds using samples collected 20 years apart, providing some information about longevity in this stock. Further comparisons with other data sets (Brazil, North Pacific) are needed to understand the migratory connectivity of this stock
    Description: Published
    Description: Refereed
    Keywords: Megaptera novaeangliae ; Genotipificación ; Genotyping ; Microsatélite ; Microsatellite ; Conexión migratoria ; Migratory connectivity
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp. 31-40
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...