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34 results for “Arctocephalus”
Figure 3 in A comparative analysis on cranial ontogeny of South American fur seals (Otariidae: Arctocephalus)
Figure 3. Bivariate standardized major axis (SMA) regressions for Arctocephalus australis (white circles and dashed line), Arctocephalus gazella (black circles and solid line), and Arctocephalus tropicalis (grey circles and dotted line): A, same slope and intercepts for A. australis, A. gazella, and A. tropicalis; B, different slopes between the growth trajectories; and C, same slope and different intercepts between species. Abbreviations as in Figure 2.
Figure 2 in A comparative analysis on cranial ontogeny of South American fur seals (Otariidae: Arctocephalus)
Figure 2. Cranial measurements of used in this study: BW, braincase width; CBL, condylobasal length; CW, alveolus width of upper canine teeth; LAU, load arm length at upper canine; LO, length of orbit; MW, mastoid width; OCPH, occipital plate height; PL, palatal length; POC, postorbital constriction; PW, palatal width; RH, rostral height; RL, rostral length; RW, rostral width; UPCL, upper postcanine length; ZW, zygomatic width.
Figure 1 in A comparative analysis on cranial ontogeny of South American fur seals (Otariidae: Arctocephalus)
Figure 1. Ventral view of skulls of male Arctocephalus australis (A, B), Arctocephalus gazella (C, D), and Arctocephalus tropicalis (E, F). Ontogenetic series represent non-adult (left) and adult (right) specimens. Scale bar: 30 mm.
Figure 4 in A comparative analysis on cranial ontogeny of South American fur seals (Otariidae: Arctocephalus)
Figure 4. Pairwise comparison of factors 1 and 2 from the principal component analysis of the ontogenetic series of Arctocephalus australis (filled squares), Arctocephalus gazella (crosses), and Arctocephalus tropicalis (triangles).
Data from: Exploring the mechanisms underlying a heterozygosity-fitness correlation for canine size in the Antarctic fur seal Arctocephalus gazella
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Data from: Low spatial genetic differentiation associated with rapid recolonization in the New Zealand fur seal Arctocephalus forsteri
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Data from: Gene discovery in the Antarctic fur seal (Arctocephalus gazella) skin transcriptome
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Microsatellite markers for assessing genetic diversity and kinship relationships in one of the largest South American fur seal (Arctocephalus australis) populations of the Pacific Ocean
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Data from: Kelp and dolphin gulls cause perineal wounds in South American fur seal pups (Arctocephalus australis) at Guafo Island, Chilean Patagonia
During five reproductive seasons, we documented the presence, extent and origin of perineal wounds in South American fur seal pups (Arctocephalus australis) on Guafo Island, Northern Chilean Patagonia. The seasonal prevalence of perineal wounds ranged from 5 to 9%, and new cases were more common at the end of the breeding season (February), when pups were on average two months old and were actively expelling hookworms (Uncinaria sp). Histologically, wounds corresponded to marked ulcerative lymphoplasmacytic and histiocytic dermatitis with granulation tissue and mixed bacterial colonies. In 2015 and 2017, kelp gulls (Larus dominicanus) and dolphin gulls (Leucophaeus scoresbii) were observed picking and wounding the perineal area of marked pups. This behaviour occurred more frequently after the pups' defecation, when sea gulls engaged in consumption of pups' faeces. The affected pups usually had moderate to marked hookworm infections along with bloody diarrhoea and anaemia. Pups with severe wounds (23% of affected animals) had swollen perineal areas and signs of secondary systemic bacterial infection. We propose that seagulls on Guafo Island have learned to consume remains of blood and parasites in the faeces of pups affected by hookworm infection, causing perineal wounds during this process. We conclude that this perineal wounding is an unintentional, occasional negative effect of an otherwise commensal gull–fur seal relationship.
Fig. 1. a in First report of pulmonary cysticercosis caused by Taenia crassiceps in a Cape fur seal (Arctocephalus pusillus)
Fig. 1. a) Large mass in the right thoracic wall. b) Protoscolex in the lung showing rostellar hooks. A mild chronic inflammation is obvious in the surrounding lung tissue.
Fig. 2. a in First report of pulmonary cysticercosis caused by Taenia crassiceps in a Cape fur seal (Arctocephalus pusillus)
Fig. 2. a) Cysticercus longicollis scolex with rostellar hooks and four suckers. b) Apical rostellum with two circular rows. c) Exogenous budding of Cysticercus longicollis in the subcutis of a Diana monkey.
Data from: Dive behaviour and foraging effort of female Cape fur seals Arctocephalus pusillus pusillus
While marine top predators can play a critical role in ecosystem structure and dynamics through their effects on prey populations, how they function is often not well understood. In southern Africa, the Cape fur seal (Arctocephalus pusillus pusillus) population constitutes the largest marine top predator biomass but little is known of its foraging ecology other than its diet and some preliminary dive records. Dive information was obtained from 32 adult females instrumented with dive recorders at the Kleinsee colony (29º34.17 S, 16 º59.80 E) in South Africa during 2006–2008. Most dives were in the depth range of epipelagic prey species (< 50 m deep) and at night, reflecting the reliance of Cape fur seals on small vertically migrating schooling prey. However, most females also performed benthic dives, which was prevalent in some individuals. Benthic diving was significantly associated with the frequency with which females exceeded their aerobic dive limit. The greater putative costs of benthic diving highlights the potential detrimental effects on Cape fur seals of environmental changes that may reduce the availability of epipelagic prey in the Benguela region of southern Africa.
Data from: Dive behaviour and foraging effort of female Cape fur seals Arctocephalus pusillus pusillus
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Data from: Kelp and dolphin gulls cause perineal wounds in South American fur seal pups (Arctocephalus australis) at Guafo Island, Chilean Patagonia
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