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8 results for “Leptonychotes”
Beneath the Antarctic sea-ice: Fine-scale analysis of Weddell seal (Leptonychotes weddellii) behaviour and predator-prey interactions, using micro-sonar data in Terre Adélie
<p>In this study, we tried to assess:<br>i) whether and how female Weddell seals feed (frequency, depth, duration) during lactation,<br>ii) what is their utilization of a limited foraging area (benthic or pelagic dives) as they are spatially constrained by the presence of their pup, and<br>iii) how can we characterize their foraging dives and the approach/catching phases using new tools providing a more detailed description of their behaviour.<br>Sonar tags were deployed on three breeding female Weddell seals in Terre Adélie (East Antarctica) in November 2019, to study animals' movements and dives at high resolution (3D acceleration, magnetometry, time and depth and GPS location), as well as information on prey and predator-prey interactions using acoustic data.</p>
Figure 2 in Sex-related differences in the postmolt distribution of Weddell seals (Leptonychotes weddellii) in the southern Weddell Sea
Figure 2. Weddell seal tracks created by interpolating estimated dive positions in time. Coastline and contours from Arndt et al. (2013) and bathymetry from ETOPO1 1 Arc-Minute Global Relief Model (Amante and Eakins 2009). Projection: Polar Stereographic. Datum: World Geodetic 1984 (WGS84).
Figure 5 in Sex-related differences in the postmolt distribution of Weddell seals (Leptonychotes weddellii) in the southern Weddell Sea
Figure 5. Resident time (the proportion of dives allocated a resident behavioral state from the state-space model taken from Bestley et al. 2015) for five male and eight female Weddell seals in region A (shallow water in the shelf), region B (deep water Filchner Trough), region C (continental shelf edge), and region D (deep water off the shelf).
Figure 1b in Sex-related differences in the postmolt distribution of Weddell seals (Leptonychotes weddellii) in the southern Weddell Sea
Figure 1b. Four regions categorized by chart contours and bathymetry. Region A is south of 74°200S and <600 m, region B is south of 74°200S and ≥600 m, region C is north of 74°400S and <2,000 m and region D is north of 74°400S and ≥2,000 m. Coastline and contours from Arndt et al. (2013) and bathymetry from ETOPO1 1 Arc-Minute Global Relief Model (Amante and Eakins 2009). Projection: Polar Stereographic. Datum: World Geodetic 1984 (WGS84).
Figure 1a in Sex-related differences in the postmolt distribution of Weddell seals (Leptonychotes weddellii) in the southern Weddell Sea
Figure 1a. Study area showing postmolt range of Weddell seals tagged with CTD-SRDLs during 2011 deployment. Axes include data on both latitude and longitude. Minimum ice extent data from January 2011 and maximum ice extent data from June 2011 (Fetterer et al. 2002). Coastline and contours from Arnt et al. (2013) and bathymetry from ETOPO1 1 Arc-Minute Global Relief Model (Amante and Eakins 2009). Projection: Polar Stereographic. Datum: World Geodetic 1984 (WGS84).
Figure 4 in Sex-related differences in the postmolt distribution of Weddell seals (Leptonychotes weddellii) in the southern Weddell Sea
Figure 4. Bathymetry in meters associated with each estimated dive position for 9 males and 10 females. Bathymetry data were extracted from ETOPO1 1 Arc-Minute Global Relief Model (Amante and Eakins 2009).
Beneath the Antarctic sea-ice: Fine-scale analysis of Weddell seal (Leptonychotes weddellii) behaviour and predator-prey interactions, using micro-sonar data in Terre Adélie
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Figure 3 in Sex-related differences in the postmolt distribution of Weddell seals (Leptonychotes weddellii) in the southern Weddell Sea
Figure 3. Daily speed (distance traveled in km/deployment length in days) for five male and eight female Weddell seals in region A (shallow water in the shelf), region B (deep water Filchner Trough), region C (continental shelf edge), and region D (deep water off the shelf).
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