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  • Marine Mammal Tracking; MMT  (4)
  • 2010-2014  (4)
Document type
Keywords
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Year
  • 1
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    Unknown
    Hydrographic data from Atka Bay taken by Weddell seals during expedition NEU2008 with links to datasets (2013)
    PANGAEA
    In:  Supplement to: McIntyre, Trevor; Stansfield, Lauren J; Bornemann, Horst; Plötz, Joachim; Bester, Marthán Nieuwoudt (2013): Hydrographic influences on the summer dive behaviour of Weddell seals (Leptonychotes weddellii) in Atka Bay, Antarctica. Polar Biology, 36(11), 1693-1700, https://doi.org/10.1007/s00300-013-1384-7
    Details
    Publication Date: 2023-04-21
    Description: In order to gain insights into species-level behavioural responses to the physical environment, it is necessary to obtain information from various populations and at all times of year. We analysed the influences of physical environmental parameters on the mid-summer dive behaviour of Weddell seals (Leptonychotes weddellii) from a little-known population at Atka Bay, Antarctica. Dive depth distributions followed a typical bimodal pattern also exhibited by seals from other populations and seals targeted both shallow water layers of 〈50 m and depths near the seafloor. Increased stratification of temperature layers within the water column resulted in increased forage efforts by the seals through relatively high numbers of dives to the seafloor, as well as forage effort associated with shallow dives. We interpret these behavioural responses to be due to increased water temperature stratification resulting in the concentration of prey species in particular depth layers.
    Keywords: Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 18 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 2
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    Unknown
    Dive depth frequency of 23 adult male southern elephant seals (Mirounga leonina) from Marion Island and King George Island (2012)
    PANGAEA
    In:  Supplement to: James, Bridget C; McIntyre, Trevor; Tosh, Cheryl Ann; Bornemann, Horst; Plötz, Joachim; Bester, Marthán Nieuwoudt (2012): Inter-population differences in diving behaviour of adult male southern elephant seals (Mirounga leonina). Polar Biology, 35(11), 1759-1766, https://doi.org/10.1007/s00300-012-1214-3
    Details
    Publication Date: 2023-04-21
    Description: Access to different environments may lead to inter-population behavioural changes within a species that allow populations to exploit their immediate environments. Elephant seals from Marion Island (MI) and King George Island (KGI) (Isla 25 de Mayo) forage in different oceanic environments and evidently employ different foraging strategies. This study elucidates some of the factors influencing the diving behaviour of male southern elephant seals from these populations tracked between 1999 and 2002. Mixed-effects models were used to determine the influence of bathymetry, population of origin, body length (as a proxy for size) and individual variation on the diving behaviour of adult male elephant seals from the two populations. Males from KGI and MI showed differences in all dive parameters. MI males dived deeper and longer (median: 652.0 m and 34.00 min) than KGI males (median: 359.1 m and 25.50 min). KGI males appeared to forage both benthically and pelagically while MI males in this study rarely reached depths close to the seafloor and appeared to forage pelagically. Model outputs indicate that males from the two populations showed substantial differences in their dive depths, even when foraging in areas of similar water depth. Whereas dive depths were not significantly influenced by the size of the animals, size played a significant role in dive durations, though this was also influenced by the population that elephant seals originated from. This study provides some support for inter-population differences in dive behaviour of male southern elephant seals.
    Keywords: Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 23 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Unknown
    Seal census raw data of campaigns EMAGE I to V between 1996 and 2000 with links to datasets (2012)
    PANGAEA
    Details
    Publication Date: 2023-04-21
    Description: The development of models of marine ecosystems in the Southern Ocean is becoming increasingly important as a means of understanding and managing impacts such as exploitation and climate change. Collating data from disparate sources, and understanding biases or uncertainties inherent in those data, are important first steps for improving ecosystem models. This review focuses on seals that breed in ice habitats of the Southern Ocean (i.e. the crabeater seal, Lobodon carcinophaga; Ross seal, Ommatophoca rossii; leopard seal, Hydrurga leptonyx; and Weddell seal, Leptonychotes weddellii). Data on populations (abundance and trends in abundance), distribution and habitat use (movement, key habitat and environmental features) and foraging (diet) are summarised, and potential biases and uncertainties inherent in those data are identified and discussed. Spatial and temporal gaps in knowledge of the populations, habitats and diet of each species are also identified.
    Keywords: Marine Mammal Tracking; MMT
    Type: Dataset
    Format: 5 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Unknown
    Immobilisation dose rates and photogrammetry based mass calculations for southern elephant seals during expedition JUB2010 (2013)
    PANGAEA
    In:  Supplement to: Bornemann, Horst; de Bruyn, P J Nico; Reisinger, Ryan R; Kästner, Sabine; Márquez, María Elba Isabel; McIntyre, Trevor; Bester, Marthán Nieuwoudt; Plötz, Joachim (2013): Tiletamine/zolazepam immobilization of adult post-moult southern elephant seal males. Polar Biology, 36(11), 1687-1692, https://doi.org/10.1007/s00300-013-1378-5
    Details
    Publication Date: 2023-05-12
    Description: Immobilization and anaesthesia of adult male southern elephant seals (Mirounga leonina) is potentially risky for animals and scientists. A tiletamine/zolazepam injection is considered the most appropriate drug combination for field application in this species. Since appropriate dosages are difficult to assess due to uncertainties in weight estimation, we used photogrammetry-derived weight estimates to ensure precise post hoc calculations of dosages. We report on 15 intramuscular tiletamine/zolazepam immobilizations of post-moult males of the upper weight class at King George Island/Isla 25 de Mayo, in April 2010. Initial injections were made using blowpipe syringes. Mean tiletamine/zolazepam combined dosages of 0.71 mg/kg (SD ± 0.16) ranged between 0.46 and 1.01 mg/kg. In four cases, ketamine was added in dosages between 0.96 and 2.61 mg/kg. Mean induction period was 23 min (± 15), and the mean duration of the procedures from first injection to release of the animals required 96 min (± 51). Four seals exhibited periods of apnoea, and one case of an extended, repetitive, and potentially critical apnoea (〉 25 and 8 min) required intervention in order to successfully re-initiate spontaneous respiration. All procedures resulted in proper immobilizations allowing for the deployment of the satellite tags on the seals' heads. The fact that even substantial deviations between the initial weight estimates and the photogrammetry-derived weight estimates had no apparent effect on the course of the immobilization underlines the drugs' wide safety margin in this species.
    Keywords: Marine Mammal Tracking; MMT
    Type: Dataset
    Format: application/zip, 2 datasets
    Location Call Number Limitation Availability
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    DATA PANGAEA
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