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14 results for “Arctocephalus pusillus pusillus”
Fig. 5 in Subcutaneous merocercoids of Clistobothrium sp. in two Cape fur seals (Arctocephalus pusillus pusillus)
Fig. 5. Suggested life cycle of Phyllobothriidea and the potential way of infection in the present cases.
Fig. 2 in Subcutaneous merocercoids of Clistobothrium sp. in two Cape fur seals (Arctocephalus pusillus pusillus)
Fig. 2. Histological section of subcutaneous adipose tissue of a 25- year–old, female fur seal (case No. 1) containing metacestode tapeworms with associated inflammation (box). The parasitic structures are characterized by a tegument (arrow) and centrally a parenchymatous matrix (asterisks) is present (A, bar = 1000 μm). Within the parenchymatous matrix of the parasite, numerous calcareous corpuscles stained with the "von Kossa" –method are present (B, bar = 100 μm). The parasite is surrounded by an inflammatory reaction composed of lymphocytes, plasma cells, macrophages and neutrophils (C, bar = 100 μm). A, C = hematoxylin and eosin.
Fig. 3 in Subcutaneous merocercoids of Clistobothrium sp. in two Cape fur seals (Arctocephalus pusillus pusillus)
Fig. 3. Light micrographs of isolated subcutaneous Clistobothrium sp. merocercoids of a fur seal (case No. 2). (A) merocercoid with invaginated scolex, (B) merocercoid with evaginated scolex on a long filament (cross), (C) scolex with terminal apical organ and four large bothridia (asterisk) each with anterior sucker (arrow), (D) bothridium with folded margin (asterisk) and large oval anterior sucker (arrow) with well–developed musculature.
Fig. 4 in Subcutaneous merocercoids of Clistobothrium sp. in two Cape fur seals (Arctocephalus pusillus pusillus)
Fig. 4. Phylogenetic trees of Clistobothrium sp. merocercoids from the Cape fur seal and related phyllobothriid species based on the 18S and 28S D2 rDNA regions using maximumlikelihood method. Nodal support is indicated by bootstrap values in percent; scale: number of substitutions per site; country and accession no. after the species name.
Fig. 1 in Subcutaneous merocercoids of Clistobothrium sp. in two Cape fur seals (Arctocephalus pusillus pusillus)
Fig. 1. Subcutaneous adipose tissue of a 27-year–old, female fur seal (case No. 2). Up to 1 cm in diameter large cavities (A, arrow) containing one or more parasites (B, arrow) as detected in the cross section. Bars = 1 cm.
Fig. 3 in First report of pulmonary cysticercosis caused by Taenia crassiceps in a Cape fur seal (Arctocephalus pusillus)
Fig. 3. Alignment result for the partial sequence of the COX 1 gene (fur seal) with an exemplary T. crassiceps COX 1 gene sequence (accession no. KY321321.1), obtained from NCBI BLASTN tool. Homology was 100% (query: KY321321.1, sbject: herein obtained sequence).
Data from: Paleoclimatic changes resulted in range expansion and subsequent divergence in brown fur seals, Arctocephalus pusillus
<p class="MsoNormal"><span>Past climatic change as a driving force of marine diversification is still largely unclear, particularly for Southern Hemisphere species. Here, we present a case study using the brown fur seal, <em>Arctocephalus pusillus,</em> and assess the geographical structure and demographic history using mitochondrial and nuclear data. Results show the two previously defined subspecies (one from Australia and the other from Southern Africa) are phylogeographically distinct. Migration analyses based on nuclear data suggest the absence of migrants among the two genetically close assemblages. The demographic history of <em>A. pusillus</em> is characterized by a glacial population expansion (~18 Kya) in the Southern African taxon, which coincides with time estimates of population expansion of prey species of seals. Approximate Bayesian Calculations support an eastward dispersal event during the Last Glacial Maximum (LGM) when sea levels were lower, followed by a postglacial divergence event, ~ 13 Kya. The demographic history of the brown fur seal in the Southern Oceans provides support that recent paleoclimatic changes could have facilitated expansions in some marine species and that postglacial sea-level rise may have acted as a dispersal barrier for species mostly confined to continental shelves. </span></p>
Data from: Paleoclimatic changes resulted in range expansion and subsequent divergence in brown fur seals, Arctocephalus pusillus
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Data from: Behavioural thermoregulation in the Australian fur seal (<em>Arctocephalus pusillus doriferus</em>)
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On following pages: 3. Juan Fernandez Fur Seal (Arctocephalus philippii); 4. Guadalupe Fur Seal (Arctocephalus townsend australis); 7. New Zealand Fur Seal (Arctocephalus forsteri); 8. Subantarctic Fur Seal (Arctocephalus tropicalis); 9. Afro-Australian); 5. Galapagos Fur Seal (Arctocephalus galapagoensis); 6. South American Fur Seal (Arctocephalus Fur Seal (Arctocephalus pusillus). in Otariidae
On following pages: 3. Juan Fernandez Fur Seal (Arctocephalus philippii); 4. Guadalupe Fur Seal (Arctocephalus townsend australis); 7. New Zealand Fur Seal (Arctocephalus forsteri); 8. Subantarctic Fur Seal (Arctocephalus tropicalis); 9. Afro-Australian); 5. Galapagos Fur Seal (Arctocephalus galapagoensis); 6. South American Fur Seal (Arctocephalus Fur Seal (Arctocephalus pusillus).
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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