Feeding habits of South American and <scp>sub‐Antarctic</scp> fur seals during their nonbreeding season in the southwestern Atlantic Ocean

Lima, Renan C. de; Albernaz, Thaise Lima de; Secchi, Eduardo R.; Cebuhar, Julieta Denise; Botta, Silvina

doi:10.1111/mms.13049

Cited by 3 publications

(1 citation statement)

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“…Nevertheless, all these reports are limited to the sighting of few individuals and, despite a few exceptions (e.g. Machado et al 2021;Lima et al 2023), little is known about the diet and any other aspects of the biology and ecology of these species far from their breeding range. Among all pinnipeds, there are three species showing an Antarctic and sub-Antarctic distribution that frequently occur in the northern coast of Argentina, these includes: Antarctic Fur Seal A. gazella, sub-Antarctic Fur Seal A. tropicalis and Leopard Seal Hydrurga leptonyx (Bastida et al 2007;CMA-SAREM 2019).…”

Section: Introductionmentioning

confidence: 99%

Aquatic Bird Predation by Antarctic and Subantarctic Pinnipeds Vagrants Off Argentina

Padula,

Romero,

Machado

et al. 2023

Preprint

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Antarctic and Sub-Antarctic pinnipeds are well-known seasonal visitors of the Southwest Atlantic Ocean. According to the literature, at their breeding grounds they feed mainly on a variety of fish, cephalopods, and crustaceans. During the non-breeding period and far away from its breeding colonies, little is known about their feeding habits. Here, we present records of predation on aquatic birds by Antarctic and Sub-Antarctic pinnipeds off northern Argentinian coast (37°27′ S, 57°06′ W to 41°50' S 65°02' W). We examined the gastrointestinal contents of 22 specimens by four pinnipeds species (Arctocephalus gazella [n = 10], A. tropicalis [n = 10] and Hydrurga leptonyx [n = 1]) collected from 1996 to 2023. Remaining of aquatic birds were found in the gastrointestinal tracts of three individuals (13.64%) of two A. gazelle and one H. leptonyx. We identified feathers, and other bird parts by comparing them to specimens from scientific collections and descriptions/illustrations from the literature. Two of the three aquatic birds found in the gastrointestinal tracts were most probably Magellanic Penguins (Spheniscus magellanicus); whereas the other one was a Great grebe (Podiceps major). To our knowledge, this is the first study reporting predation on aquatic birds by Antarctic pinnipeds far from their breeding colonies.

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Section: Introductionmentioning

confidence: 99%

Aquatic Bird Predation by Antarctic and Subantarctic Pinnipeds Vagrants Off Argentina

Padula,

Romero,

Machado

et al. 2023

Preprint

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Aquatic bird predation by antarctic and subantarctic pinnipeds vagrants off argentina

Padula,

Romero,

Machado

et al. 2024

Polar Biol

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Nestedness of benthic diatom metacommunity in relation to species niche width and environmental variables in a large near-natural catchment

Qi,

Liu,

Chen

et al. 2024

Front. Ecol. Evol.

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Insight into the non-random distribution patterns of species in different regions is a foundational aim of research in community ecology and biogeography. The nestedness pattern, which investigates changes in species composition and abundance, has been widely used in numerous studies. However, studies on the nestedness of benthic diatoms are extremely rare, and consequently little has been mentioned of their assemblage mechanisms. To fill this gap, based on 168 benthic diatom species from 147 sampling sites in the Thousand Island Lake (TIL) catchment, we calculated their nestedness and niche width with the aim of i) analyzing the nestedness of benthic diatoms communities with different attachment abilities in TIL; ii) calculating niche width differences between nested and idiosyncratic species with different attachment abilities; iii) investigating the differences in alpha and beta diversity between nested and idiosyncratic sites; iv) examining whether environmental variables influencing the nestedness of benthic diatom communities are dependent on attachment ability. The results demonstrated a significant nestedness pattern in the benthic diatom metacommunity, and the sampling sites of low attachment species not only exhibited a nestedness pattern, but also with a lower nestedness value compared to the sampling sites of all species. Nested and idiosyncratic species differed in niche width, whereas differences between nested and idiosyncratic species of low attachment species were smaller. Additionally, significant differences in alpha and beta diversity were observed between nested and idiosyncratic sites. Furthermore, it was revealed that the nestedness of benthic diatom metacommunity in our study area were mostly influenced by local environmental variables. Our study contributes to the understanding of the significant nestedness observed in benthic diatom metacommunity in TIL, highlighting its relevance to biodiversity conservation efforts.

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Feeding habits of South American and sub‐Antarctic fur seals during their nonbreeding season in the southwestern Atlantic Ocean

Cited by 3 publications

References 124 publications

Aquatic Bird Predation by Antarctic and Subantarctic Pinnipeds Vagrants Off Argentina

Aquatic Bird Predation by Antarctic and Subantarctic Pinnipeds Vagrants Off Argentina

Aquatic bird predation by antarctic and subantarctic pinnipeds vagrants off argentina

Nestedness of benthic diatom metacommunity in relation to species niche width and environmental variables in a large near-natural catchment

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