Bibliografie tematiche / Southern fur seals Ecology South Africa

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Letteratura scientifica selezionata sul tema "Southern fur seals Ecology South Africa"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 19 febbraio 2022

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Articoli di riviste sul tema "Southern fur seals Ecology South Africa"

Brunner, S., P. D. Shaughnessy, and M. M. Bryden. "Geographic variation in skull characters of fur seals and sea lions (family Otariidae)." Australian Journal of Zoology 50, no. 4 (2002): 415. http://dx.doi.org/10.1071/zo01056.

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Geographic variation was observed in skulls of several otariid species, with a general change in size corresponding with a change in latitude and primary productivity. The largest specimens were from cool temperate localities, conforming mostly to Rensch's rule. Skulls of Australian sea lions from Western Australia were generally smaller in condylobasal length, but were more robust than those from South Australia. The subantarctic fur seal did not conform to Bergmann's rule: skulls from Amsterdam Island (37�55´S) were largest, those from Gough Island (40�20´S) intermediate and those from Mario

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Kirkman, S. P., D. P. Costa, A. L. Harrison, P. G. H. Kotze, W. H. Oosthuizen, M. Weise, J. A. Botha, and J. P. Y. Arnould. "Dive behaviour and foraging effort of female Cape fur seals Arctocephalus pusillus pusillus." Royal Society Open Science 6, no. 10 (October 2019): 191369. http://dx.doi.org/10.1098/rsos.191369.

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While marine top predators can play a critical role in ecosystem structure and dynamics through their effects on prey populations, how the predators function in this role is often not well understood. In the Benguela region of 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 (29°34.17′ S, 16°59.80′ E) in S

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Brunner, S. "Cranial morphometrics of the southern fur seals Arctocephalus forsteri and A. pusillus (Carnivora : Otariidae)." Australian Journal of Zoology 46, no. 1 (1998): 67. http://dx.doi.org/10.1071/zo97020.

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The identification and classification of unknown specimens of Arctocephalus from regions of Australasia has proven difficult. Skulls from the New Zealand fur seal (Arctocephalus forsteri) and the Australian fur seal (A. pusillus doriferus), and data from specimens of the South African fur seal (A. p. pusillus), were examined. A visual method was devised to identify and separate A. p. doriferus from A. forsteri for both sexes and for most physiological age-groups. A statistical method for morphometric separation of these species was applied to adult specimens. Characteristics of males and femal

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Botha, JA, SP Kirkman, JPY Arnould, AT Lombard, GJG Hofmeyr, MA Meÿer, PGH Kotze, and PA Pistorius. "Geographic variation in at-sea movements, habitat use and diving behaviour of female Cape fur seals." Marine Ecology Progress Series 649 (September 10, 2020): 201–18. http://dx.doi.org/10.3354/meps13446.

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Knowledge of animal foraging behaviour has implications for management and conservation. While Cape fur seals Arctocephalus pusillus pusillus comprise a major proportion of the southern African marine predator biomass, little is known about their at-sea movements. We investigated foraging distribution, habitat use and diving behaviour for 35 adult female Cape fur seals from 3 breeding colonies experiencing contrasting oceanographic regimes. Animals from Black Rocks, the smallest and eastern-most colony, undertook shorter foraging trips and utilised shallower waters over the shelf. In compariso

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WICKENS, P. A. "Fur seals and lobster fishing in South Africa." Aquatic Conservation: Marine and Freshwater Ecosystems 6, no. 3 (September 1996): 179–86. http://dx.doi.org/10.1002/(sici)1099-0755(199609)6:3<179::aid-aqc184>3.0.co;2-n.

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Harcourt, Robert. "Individual variation in predation on fur seals by southern sea lions (Otaria byronia) in Peru." Canadian Journal of Zoology 71, no. 9 (September 1, 1993): 1908–11. http://dx.doi.org/10.1139/z93-273.

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Southern sea lions (Otaria byronia) were observed to prey on juvenile and adult female South American fur seals (Arctocephalus australis) at Punta San Juan, Peru (15°22′S, 75°12′W) between October 1987 and December 1988. Over the course of the study there were 165 attacks on fur seals with 33 seals killed. While both adult male and subadult male sea lions captured and killed fur seals, adult female and juvenile sea lions never acted aggressively towards fur seals. Adult males attacked fur seals on 82.4% of the occasions when they were present at the rookery, subadults on 52% of occasions. Dist

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Shaughnessy, Peter D., Catherine M. Kemper, David Stemmer, and Jane McKenzie. "Records of vagrant fur seals (family Otariidae) in South Australia." Australian Mammalogy 36, no. 2 (2014): 154. http://dx.doi.org/10.1071/am13038.

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Abstract (sommario):

Two fur seal species breed on the southern coast of Australia: the Australian fur seal (Arctocephalus pusillus doriferus) and the New Zealand fur seal (A. forsteri). Two other species are vagrants: the subantarctic fur seal (A. tropicalis) and the Antarctic fur seal (A. gazella). We document records of vagrant fur seals in South Australia from 1982 to 2012 based primarily on records from the South Australian Museum. There were 86 subantarctic fur seals: 49 specimens and 37 sightings. Most (77%) were recorded from July to October and 83% of all records were juveniles. All but two specimens were

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Wickens, P. "Conflict between Cape (South African) fur seals and line fishing operations." Wildlife Research 23, no. 1 (1996): 109. http://dx.doi.org/10.1071/wr9960109.

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Abstract (sommario):

Cape (South African) fur seals (Arctocephalus pusillus pusillus) interact with line-fishermen in South Africa, particularly during fishing for the migratory species snoek (Thyrsites atun), and mostly when snoek are specifically being targeted. Loss of fish and tackle as a result of seals is estimated to be between at least a half and one million Rand (A$l75000-372000) annually or 3.3-7% of the total annual landed value of snoek. The presence of seals may also disturb fishing operations by causing fish to sound although this is difficult to quantify. Deliberate killing of seals by fishermen dur

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Townrow, K., and P. D. Shaughnessy. "Fur seal skull from sealers' quarters at Sandy Bay, Macquarie Island, Southern Ocean." Polar Record 27, no. 162 (July 1991): 245–48. http://dx.doi.org/10.1017/s0032247400012651.

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AbstractFur seals were exterminated from Macquarie Island about 20 years after discovery of the island in 1810. Their specific identity is unknown. Few fur seals were reported at the island until it was occupied by the Australian National Antarctic Research Expeditions in 1948. Fur seal numbers are now increasing. An archaeological excavation at a sealers' quarters at Sandy Bay in 1988 revealed the fragmented skull of a young Antarctic fur sealArctocephalus gazella1.1 m below the surface in a layer dated in the 1870s and 1880s. This period coincides with the recovery of fur seal populations in

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Ling, JK. "Impact Of Colonial Sealing On Seal Stocks Around Australia, New Zealand And Subantarctic Islands Between 150 And 170 Degrees East." Australian Mammalogy 24, no. 1 (2002): 117. http://dx.doi.org/10.1071/am02117.

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Abstract (sommario):

Details of southern elephant seal oil and fur seal and sea lion skin cargoes have been extracted from a large number of secondary sources dealing with Australian and New Zealand maritime history, which in turn referred to numerous primary sources of information. The data were collated and analysed for ten areas in the south-west Pacific region and published recently in two separate larger works. This review is a synthesis and analysis of the impact of the colonial sealing industry on seal stocks in the region, based on those papers, with some minor revisions and reference to works by other aut

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Più fonti

Tesi sul tema "Southern fur seals Ecology South Africa"

Page, Brad, and page bradley@saugov sa gov au. "Niche partitioning among fur seals." La Trobe University. Zoology Department, School of Life Sciences, 2005. http://www.lib.latrobe.edu.au./thesis/public/adt-LTU20060622.153716.

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Abstract (sommario):

At Cape Gantheaume, Kangaroo Island (South Australia), adult male, lactating female and juvenile New Zealand (NZ) and Australian fur seals regularly return to the same colony, creating the potential for intra- and inter-specific foraging competition in nearby waters. I hypothesised that these demographic groups would exhibit distinct foraging strategies, which reduce competition and facilitate their coexistence. I analysed the diet of adult male, adult female and juvenile NZ fur seals and adult male Australian fur seals and studied the diving behaviour of adult male and lactating female NZ fur

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Stewardson, Carolyn Louise. "Biology and conservation of the Cape (South African) fur seal arctocephalus pusillus pusillus (Pinnipedia: Otariidae)from the Eastern Cape Coast of South Africa /." View thesis entry in Australian Digital Theses Program, 2001. http://thesis.anu.edu.au/public/adt-ANU20030124.162757/index.html.

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