Temporada reproductiva del lobo fino austral, Arctocephalus australis (Zimmerman, 1783) en la Isla Guafo, Chiloé, Chile

Pavés, Héctor; Schlatter, Roberto

doi:10.4067/s0716-078x2008000100011

Cited by 28 publications

(26 citation statements)

References 10 publications

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“…1): has been considered to be one of the most important breeding site, with the highest number of births each year for the northern Chilean population of SAFS since 1986, when El Niño Southern Oscillation (ENSO) event made fur seals to migrate from Peru to North Chile (Guerra & Torres 1987 Isla Guafo (South Chile, 43º33'S; 74º51'W; Fig. 1): this is the breeding colony of SAFS with the highest annual pup production between the 18ºS and 48ºS (Pavés & Schlatter 2008). Punta Weather is on Isla Guafo, 30 nm from the Port of Quellón (43°07'S; 73°36'W) on the southwest extreme of Chiloe Island.…”

Section: Breeding Coloniesmentioning

confidence: 99%

“…Punta Weather is on Isla Guafo, 30 nm from the Port of Quellón (43°07'S; 73°36'W) on the southwest extreme of Chiloe Island. The two largest breeding sites on Isla Guafo, with an annual production of 1,200 pups (Pavés & Schlatter 2008), were chosen for this study. Direct observations of groups and their breeding behavior were conducted from 08:00 to 20:00 h using binoculars.…”

Section: Breeding Coloniesmentioning

confidence: 99%

“…Two or 3 detailed counts of all social age classes were carried out weekly by observers. Censuses were repeated when counts among observers differed by 10% or more (Pavés et al 2005, Pavés & Schlatter 2008. A territory was determined as established when a territorial male was permanently rounded by at least 2 adult females in a specific place, and the male tried continuously to group them around him.…”

Section: Demography Breeding Season and Analysesmentioning

confidence: 99%

“…For each breeding site, one or 2 researcher performed continuous scan for a period of 6-12 h. The number of mating was standardized in each breeding colony by the effort unit (observation hours per day). Pupping and mating dates (periods and peak) at the distinct breeding colonies were estimated using the sigmoid method described by Trites (1992), and applied by García-Aguilar & Aurioles-Gamboa (2003), Soto et al (2004), Pavés et al (2005), and Pavés & Schlatter (2008) in sea lions and fur seals. As the numbers of pups or mates increases during the breeding season in a logistic way, they can be fitted to a sigmoidal equation (Gompertz model), enabling the breeding periods (frequency curves) and peak (maximum) of each breeding season to be estimated from the daily incremental difference of each fitted Gompertz model for births and mates.…”

Section: Demography Breeding Season and Analysesmentioning

confidence: 99%

“…Like most Otariidae, the reproductive activities of SAFS occur in spring-summer, within a short period of time known as the reproductive synchronization period (Majluf 1987(Majluf , 1992Pavés et al 2005, Pavés & Schlatter 2008. This period coincides with greater marine productivity and higher temperatures in coastal environments, favoring the development and survival of the offspring and ensuring the reproductive success of otariids species from year to year (Bowen 1991, Trites & Antonelis 1994, Testa 2002, Gibbens & Arnould 2009.…”

Section: Introductionmentioning

confidence: 99%

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Breeding season of the South American fur seal (Arctocephalus australis, Otariidae: Carnivora): New data for establishing independent evolutionary histories?

Pavés¹,

Schlatter

Franco‐Trecu³

et al. 2016

Rev. biol. mar. oceanogr.

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Section: Breeding Coloniesmentioning

confidence: 99%

Section: Breeding Coloniesmentioning

confidence: 99%

Section: Demography Breeding Season and Analysesmentioning

confidence: 99%

Section: Demography Breeding Season and Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Breeding season of the South American fur seal (Arctocephalus australis, Otariidae: Carnivora): New data for establishing independent evolutionary histories?

Pavés¹,

Schlatter

Franco‐Trecu³

et al. 2016

Rev. biol. mar. oceanogr.

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Genetic connectivity of the South American fur seal (Arctocephalus australis) across Atlantic and Pacific oceans revealed by mitochondrial genes

Rodrigues

Seguel

Gutiérrez

et al. 2018

Aquatic Conservation

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South American fur seals, Arctocephalus australis, were intensively hunted for centuries, leaving the species at the edge of extinction. After the cessation of commercial hunting in the 20th century the overall population has increased to an estimated population of 250 000–300 000 individuals, with Guafo Island being the largest breeding colony in Southern Chile with Guafo Island in Southern Chile being the largest breeding colony. The genetic diversity of the South American fur seal population on Guafo Island and the possible genetic connectivity among populations from the Atlantic and Pacific oceans were studied in order to assess the importance of the Southern Chile Pacific population for the management of the species. Mitochondrial DNA sequences from the Guafo Island population were compared with those from various Atlantic (Brazil, Uruguay, and Argentina) and Pacific (Peru) populations previously studied. The results indicate the occurrence of historical and/or current gene flow among the populations of Guafo Island in the Pacific Ocean and the populations of the Atlantic Ocean, displaying a lack of genetic structure within these areas. In contrast, the Peruvian population is highly divergent compared with the Chilean and Atlantic populations. The lack of genetic structure of Guafo Island fur seals suggests that this group is connected to populations in the Atlantic Ocean. Thus, the significant genetic diversity pool harboured by the Guafo Island population represents the northernmost point of expansion of this species from the Atlantic Ocean to the Pacific Ocean, which could be important for the eventual dispersal of the species to more northern areas of the Pacific and to the future adaptation of the species to changing environmental conditions on the Pacific coasts.

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Re‐evaluating the population size of South American fur seals and conservation implications

Baylis

Orben

Arkhipkin

et al. 2019

Aquatic Conservation

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South American fur seals (Arctocephalus australis) are widely distributed, yet surprisingly little is known about their ecology. In particular, population data are sparse and outdated for many breeding locations, including the Falkland Islands. Data deficiency impedes the development of coherent conservation and management strategies. To address knowledge gaps, for the first time since 1965 an archipelago‐wide census of South American fur seals breeding at the Falkland Islands was undertaken, which provided the first pup abundance estimate since 1926 – data that are critical for assessing population trends. In total, 36,425 South American fur seal pups were counted at the Falkland Islands in 2018, a greater than four‐fold increase since the last census, and far greater than the 7,990 pups counted in Uruguay, which was presumed to be the largest South American fur seal population in the world. Hence, based on pup abundance, the Falkland Islands is presently the largest population of South American fur seals, even when considering a correction factor of 3.9 that was applied to pup counts in Uruguay, which yielded an estimated 31,160 pups. The results redefine South American fur seal abundance, the contribution of breeding locations (Falkland Islands, Uruguay, Argentina, Chile) and the distribution of breeding colonies at the Falkland Islands, which has far reaching implications for conservation and management. In particular, the present study has effectively doubled the Atlantic population size of the species, which is now estimated to comprise about 76,000 pups, of which the Falkland Islands accounts for 48% and Uruguay 41%. Accordingly, changes in the number of South American fur seals breeding at the Falkland Islands will influence the global population trends and conservation status of the species. Monitoring South American fur seals breeding at the Falkland Islands is therefore crucial to understand the impacts of anthropogenic pressures, such as fisheries, and to inform management and conservation policy. The results provide a baseline from which to measure changes in abundance.

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Temporada reproductiva del lobo fino austral, Arctocephalus australis (Zimmerman, 1783) en la Isla Guafo, Chiloé, Chile

Cited by 28 publications

References 10 publications

Breeding season of the South American fur seal (Arctocephalus australis, Otariidae: Carnivora): New data for establishing independent evolutionary histories?

Breeding season of the South American fur seal (Arctocephalus australis, Otariidae: Carnivora): New data for establishing independent evolutionary histories?

Genetic connectivity of the South American fur seal (Arctocephalus australis) across Atlantic and Pacific oceans revealed by mitochondrial genes

Re‐evaluating the population size of South American fur seals and conservation implications

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