Predation of South American sea lions (Otaria flavescens) on artisanal fisheries in the Rio de la Plata estuary

María, Maite De; Barboza, Francisco R.; Szteren, Diana

doi:10.1016/j.fishres.2013.09.006

Cited by 17 publications

(17 citation statements)

References 15 publications

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“…The increase in pinniped abundance at Las Pipas coincides with the period with the higher frequency of interactions at La Mulata fishing location, which is very close to Las Pipas (DE MARÍA et al, 2013). Sea lions which frequently interact with artisanal fisheries are sighted throughout the year at Las Pipas and during the Winter months mostly adult males are involved (SZTEREN and PÁEZ, 2002).…”

Section: Discussionmentioning

confidence: 73%

Otaria flavescens and Arctocephalus australis abundance in poorly known sites: a spatial expansion of colonies?

Szteren

2015

Braz. j. oceanogr.

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The establishment of new pinniped colonies is a consequence of complex dynamics in which some colonies may transform from haul-outs into breeding sites. The aim of this article was to estimate the abundance of Otaria flavescens and Arctocephalus australis at two poorly known sites of Uruguay, the easternmost “Isla Verde-Islote Coronilla” (IV-IC) and the westernmost “Las Pipas” (LP). From June 2008 to June 2009 count from boats were conducted at LP, and aerial censuses at Isla Verde. At LP both pinniped species were recorded, and the abundance was maximum in July with a total of 202 animals.O. flavescens was present throughout the year, mainly adult males, while A. australis was only observed from June to October. LP is defined as a haul-out structure used as resting area, especially for O. flavescens. At IV-IC between 225 and 521 O. flavescens were recorded. The number of animals increased in Spring and Summer. Females were the most abundant category and pups were recorded in March. According to the age structure and the presence of pups, we propose it would have and incipient reproductive activity. This colony should be monitored in relation with its category as a marine protected area.

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Section: Discussionmentioning

confidence: 73%

Otaria flavescens and Arctocephalus australis abundance in poorly known sites: a spatial expansion of colonies?

Szteren

2015

Braz. j. oceanogr.

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“…This genetic differentiation coupled with the conservation problems faced by the population from Uruguay, such as the long commercial sealing period [24], fishery interactions [78], and population decline due to unknown reasons [79], this population become an urgent priority, demanding more realistic management plans for its conservation.…”

Section: Discussionmentioning

confidence: 99%

Ancient female philopatry, asymmetric male gene flow, and synchronous population expansion support the influence of climatic oscillations on the evolution of South American sea lion (Otaria flavescens)

et al. 2017

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The South American sea lion (Otaria flavescens) is widely distributed along the southern Atlantic and Pacific coasts of South America with a history of significant commercial exploitation. We aimed to evaluate the population genetic structure and the evolutionary history of South American sea lion along its distribution by analyses of mitochondrial DNA (mtDNA) and 10 nuclear microsatellites loci. We analyzed 147 sequences of mtDNA control region and genotyped 111 individuals of South American sea lion for 10 microsatellite loci, representing six populations (Peru, Northern Chile, Southern Chile, Uruguay (Brazil), Argentina and Falkland (Malvinas) Islands) and covering the entire distribution of the species. The mtDNA phylogeny shows that haplotypes from the two oceans comprise two very divergent clades as observed in previous studies, suggesting a long period (>1 million years) of low inter-oceanic female gene flow. Bayesian analysis of bi-parental genetic diversity supports significant (but less pronounced than mitochondrial) genetic structure between Pacific and Atlantic populations, although also suggested some inter-oceanic gene flow mediated by males. Higher male migration rates were found in the intra-oceanic population comparisons, supporting very high female philopatry in the species. Demographic analyses showed that populations from both oceans went through a large population expansion ~10,000 years ago, suggesting a very similar influence of historical environmental factors, such as the last glacial cycle, on both regions. Our results support the proposition that the Pacific and Atlantic populations of the South American sea lion should be considered distinct evolutionarily significant units, with at least two managements units in each ocean.

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“…All over the world, coastal communities and traditional small-scale fisheries are experiencing an impact on recovering populations of marine mammals. This entails a conflict with prevailing conservation interests that frame population increases as successful management (Davis et al 2020;De Mar ıa, Barboza, and Szteren 2014;Mouro, Santos, and Castro 2018). Terrestrial wildlife species threatened by or threatening humans, and their activities, have received considerable attention (Dickman 2010), but the marine context of human-wildlife interaction is a relatively new field of study (Guerra 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Socio-ecological approaches to understand interaction between coastal communities and marine wildlife has been called for, and so far, research has focused on the collective level of adaptive governance and management (e.g. Butler et al 2015;De Mar ıa et al 2014;Meek et al 2011). Research has shown the importance of collaboration to identify management measures that are accepted and effective (De Mar ıa et al 2014;K€ onigson and Lunneryd 2013;K€ onigson et al 2015;Sep ulveda et al 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Butler et al 2015;De Mar ıa et al 2014;Meek et al 2011). Research has shown the importance of collaboration to identify management measures that are accepted and effective (De Mar ıa et al 2014;K€ onigson and Lunneryd 2013;K€ onigson et al 2015;Sep ulveda et al 2018). Results at individual level show that local attitudes toward management strategies vary greatly between studies.…”

Section: Introductionmentioning

confidence: 99%

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Local People’s Appraisal of the Fishery-Seal Situation in Traditional Fishing Villages on the Baltic Sea Coast in Southeast Sweden

Johansson

Waldo

2020

Society & Natural Resources

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The gray seal (Halichoerus grypus) population in the Baltic Sea is flourishing. On the one hand, this can be interpreted as successful conservation management but, on the other, the gray seal has also become a persistent problem for small-scale coastal fisheries. Departing from the appraisal theory of emotion, this case study investigated local people's appraisals of the current situation of small-scale fishery and seals in three fishing villages. Survey results and interviews showed that the fishery-seal situation is perceived as being highly relevant, with negative implications, and local communities and fishers lack the tools to tackle the challenges. Successful management requires not only attention to local context and stakeholder groups, but also to people's individual interpretation or appraisal of the situation. Place-specific coping strategies should be sought, to balance the seal population with the promotion of smallscale fisheries as a sustainable local industry and as a cultural heritage.

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Predation of South American sea lions (Otaria flavescens) on artisanal fisheries in the Rio de la Plata estuary

Cited by 17 publications

References 15 publications

Otaria flavescens and Arctocephalus australis abundance in poorly known sites: a spatial expansion of colonies?

Otaria flavescens and Arctocephalus australis abundance in poorly known sites: a spatial expansion of colonies?

Ancient female philopatry, asymmetric male gene flow, and synchronous population expansion support the influence of climatic oscillations on the evolution of South American sea lion (Otaria flavescens)

Local People’s Appraisal of the Fishery-Seal Situation in Traditional Fishing Villages on the Baltic Sea Coast in Southeast Sweden

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