scholarly journals Segregation in a sexually dimorphic mammal: a mixed-effects modelling analysis of diving behaviour in southern elephant seals

2010 ◽  
Vol 412 ◽  
pp. 293-304 ◽  
Author(s):  
T McIntyre ◽  
CA Tosh ◽  
J Plötz ◽  
H Bornemann ◽  
MN Bester
Keyword(s):  
Mixed Effects ◽  
Diving Behaviour ◽  
Sexually Dimorphic ◽  
Elephant Seals ◽  
Modelling Analysis ◽  
Southern Elephant Seals

Foraging strategies of southern elephant seals (Mirounga leonina) in relation to frontal zones and water masses

2001 ◽  
Vol 13 (4) ◽  
pp. 371-379 ◽  
Author(s):  
Iain Field ◽  
Mark Hindell ◽  
David Slip ◽  
Kelvin Michael
Keyword(s):  
Dive Depth ◽  
Polar Front ◽  
Water Masses ◽  
Diving Behaviour ◽  
Water Bodies ◽  
Foraging Strategies ◽  
Mirounga Leonina ◽  
Mode Water ◽  
Elephant Seals ◽  
Southern Elephant Seals

Geolocating-time-depth-temperature-recorders (GLTDTR) provided a continuous record of diving behaviour in relation to water temperature for ten female southern elephant seals from Macquarie Island during their post-breeding trips to sea. Four water bodies were determined from depth/temperature profiles recorded by the GLTDTRs. These water bodies corresponded to Sub-Antarctic Mode Water (SAMW), Polar Front Zone Water (PFZW), Polar Front Water (PFW) and Antarctic Water Masses (AWM). Thermal structures within these water bodies did not influence seal diving behaviour. Overall mean dive depth, nocturnal dive depths, diurnal dive depths and dive duration were similar in all areas. However, individuals did change behaviour as they moved between different water bodies. Seals also used different water bodies in the two different years of the study. We suggest that variations in foraging behaviour among seals are a result of prey distribution associated with local oceanographic conditions, but also reflect important individual foraging strategies within thermal zones.

scholarly journals Movement responses to environment: fast inference of variation among southern elephant seals with a mixed effects model

2018 ◽  
Author(s):  
I. D. Jonsen ◽  
C. R. McMahon ◽  
T. A. Patterson ◽  
M. Auger-Méthé ◽  
R. Harcourt ◽  
...  
Keyword(s):  
Sea Ice ◽  
Movement Patterns ◽  
Elephant Seal ◽  
Mixed Effects ◽  
Foraging Strategies ◽  
Southern Elephant Seal ◽  
Mirounga Leonina ◽  
Movement Model ◽  
Elephant Seals ◽  
Southern Elephant Seals

AbstractLike many species, movement patterns of southern elephant seals (Mirounga leonina) are being influenced by long-term environmental change. These seals migrate up to 4000 km from their breeding colonies, foraging for months in a variety of Southern Ocean habitats. Understanding how movement patterns vary with environmental features and how these relationships differ among individuals employing different foraging strategies can provide insight into foraging performance at a population level. We apply new fast-estimation tools to fit mixed effects within a random walk movement model, rapidly inferring among-individual variability in southern elephant seal environment-movement relationships. We found that seals making foraging trips to the sea-ice on or near the Antarctic continental shelf consistently reduced speed and directionality (move persistence) with increasing sea ice coverage and had variable responses to chlorophyll a concentration, whereas seals that foraged pelagically reduced move persistence in regions where circumpolar deep water shoaled. Given future climate scenarios, pelagic foragers may encounter more productive habitat but sea-ice foragers may see reduced habitat availability. Our approach is scalable to large telemetry data sets and allows flexible combinations of mixed effects to be evaluated via model selection, thereby illuminating the ecological context of animal movements that underlie habitat use.

scholarly journals Inter-population differences in diving behaviour of adult male southern elephant seals (Mirounga leonina)

Polar Biology ◽  
2012 ◽  
Vol 35 (11) ◽  
pp. 1759-1766 ◽  
Author(s):  
B. S. James ◽  
T. McIntyre ◽  
C. A. Tosh ◽  
H. Bornemann ◽  
J. Plötz ◽  
...  
Keyword(s):  
Adult Male ◽  
Diving Behaviour ◽  
Population Differences ◽  
Mirounga Leonina ◽  
Elephant Seals ◽  
Southern Elephant Seals

scholarly journals Movement responses to environment: fast inference of variation among southern elephant seals with a mixed effects model

Ecology ◽  
2018 ◽  
Vol 100 (1) ◽  
Author(s):  
I. D. Jonsen ◽  
C. R. McMahon ◽  
T. A. Patterson ◽  
M. Auger‐Méthé ◽  
R. Harcourt ◽  
...  
Keyword(s):  
Mixed Effects ◽  
Mixed Effects Model ◽  
Elephant Seals ◽  
Southern Elephant Seals

scholarly journals Variation in body condition during the post-moult foraging trip of southern elephant seals and its consequences on diving behaviour

2014 ◽  
Vol 217 (14) ◽  
pp. 2609-2619 ◽  
Author(s):  
G. Richard ◽  
J. Vacquie-Garcia ◽  
J. Jouma'a ◽  
B. Picard ◽  
A. Genin ◽  
...  
Keyword(s):  
Body Condition ◽  
Diving Behaviour ◽  
Elephant Seals ◽  
Southern Elephant Seals

scholarly journals The role of eddies in the diving behaviour of female southern elephant seals

Polar Biology ◽  
2015 ◽  
Vol 39 (2) ◽  
pp. 297-307 ◽  
Author(s):  
Philip P. Massie ◽  
Trevor McIntyre ◽  
Peter G. Ryan ◽  
Marthán N. Bester ◽  
Horst Bornemann ◽  
...  
Keyword(s):  
Diving Behaviour ◽  
Elephant Seals ◽  
Southern Elephant Seals

scholarly journals Southern elephant seals from Kerguelen Islands confronted by Antarctic Sea ice. Changes in movements and in diving behaviour

2007 ◽  
Vol 54 (3-4) ◽  
pp. 343-355 ◽  
Author(s):  
Frédéric Bailleul ◽  
Jean-Benoıˆt Charrassin ◽  
Robert Ezraty ◽  
Fanny Girard-Ardhuin ◽  
Clive R. McMahon ◽  
...  
Keyword(s):  
Sea Ice ◽  
Diving Behaviour ◽  
Elephant Seals ◽  
Kerguelen Islands ◽  
Antarctic Sea Ice ◽  
Southern Elephant Seals

Diving behaviour and foraging location of female southern elephant seals from Patagonia

1995 ◽  
Vol 236 (1) ◽  
pp. 55-71 ◽  
Author(s):  
C. CAMPAGNA ◽  
B. J. LE BOEUF ◽  
S. B. BLACKWELL ◽  
D. E. CROCKER ◽  
F. QUINTANA
Keyword(s):  
Diving Behaviour ◽  
Elephant Seals ◽  
Southern Elephant Seals

Serological screening for Brucella spp. and Leptospira spp. antibodies in southern elephant seals Mirounga leonina from Elephant Island, Antarctica, in 2003 and 2004

2020 ◽  
Vol 142 ◽  
pp. 161-170
Author(s):  
AM Sánchez-Sarmiento ◽  
V Ruoppolo ◽  
MMC Muelbert ◽  
JS Ferreira Neto ◽  
JL Catão-Dias
Keyword(s):  
Austral Summer ◽  
Agglutination Test ◽  
South Shetland Islands ◽  
Climate Change Scenarios ◽  
Mirounga Leonina ◽  
Serological Screening ◽  
Elephant Seals ◽  
Southern Elephant Seals ◽  
Monitoring And Surveillance ◽  
Elephant Island

Brucella spp. and Leptospira spp. antibodies were surveyed in 35 southern elephant seals (SESs) Mirounga leonina at Elephant Island (South Shetland Islands), western Antarctic peninsula, in the Austral summer of 2003 and 2004. The rose Bengal test and a commercial competitive ELISA (c-ELISA) were used to detect Brucella spp. exposure, and the microscopic agglutination test (MAT) with 22 live serovars was used to determine anti-Leptospira spp. antibodies. We found evidence of Brucella spp. exposure in 3 of 35 (8.6%) SESs tested via the c-ELISA displaying high percentage inhibition (PI), similar to other studies in pinnipeds in which Brucella spp. antibodies have been determined. Two of the 3 positives were pups (PI = 70.4 and 86.6%), while the third was an adult female (PI = 48.8%). The 3 c-ELISA positive SESs were additionally tested via the serum agglutination test but were found to be negative. All individuals were negative for antibodies against 22 Leptospira spp. serovars by MAT. These results contribute to the knowledge and monitoring of zoonotic pathogens with epizootic potential in Southern Ocean pinnipeds. Given the potential impact that pathogens may have on the abundance of wild (sometimes threatened and endangered) populations, constant monitoring and surveillance are required to prevent pathogen spread, particularly under forecast climate change scenarios.

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