Necrophagy of a nurse shark (Ginglymostoma cirratum) by tiger sharks (Galeocerdo cuvier)

Rada, Danilo P.; Burgess, George H.; Rosa, Ricardo S.; Gadig, Otto Bismarck Fazzano

doi:10.11144/javeriana.sc20-3.noan

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…Other important records for the species in Brazil obtained herein also demonstrate opportunistic scavenging habits ( Rosas et al, 1992 ; Di Beneditto, 2004 ; Bornatowski et al, 2012a , 2012b ; Rada et al, 2015 ), including feeding on other sharks (nurse sharks, Ginglymostoma cirratum ) in the first report for this type of event worldwide ( Rada et al, 2015 ). This opportunistic scavenging has also been reported in another study in Brazil, although not retrieved in our initial search.…”

Section: Discussionsupporting

confidence: 68%

Almost nothing is known about the tiger shark in South Atlantic waters

Balanin

Hauser‐Davis

Giareta

et al. 2023

PeerJ

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The tiger shark (Galeocerdo cuvier) has been relatively well assessed concerning biology and ecology aspects in both Atlantic and Pacific North America and in Caribbean waters. The amount of data in these regions has led to the species protection under capture quotas and with the creation of sanctuaries. The reality in developing countries, however, is the exact opposite, with scarce information on the species in the southern hemisphere, namely South American and African waters. In these regions, protection measures are insufficient, and studies on tiger shark biology and ecology are scarce, significantly hindering conservation and management efforts. Thus, the aim of this study was to compile scientific literature on the tiger shark in the South Atlantic and discuss the impact of these data (or lack thereof) distributed within a total of ten research categories for guiding management plans. In total, 41 scientific publications on different G. cuvier biology and ecology aspects were obtained. The most studied topics were Feeding Ecology (n = 12), followed by Human Interactions (n = 8), and Movements and Migration (n = 7). Northeastern Brazil (Southwest Atlantic) was the most researched area, probably due to the higher coastal abundance of tiger sharks in this area, alongside a high number of recorded attacks, justifying funding for studies in the region. No studies carried out in other South American or African countries were found. It is important to mention that even though some research topics are relatively well covered, a severe knowledge gap is noted for risk assessments and fisheries management, with a proposition for the implementation of sanctuaries noted. This is, however, particularly worrisome, as the South Atlantic is mostly unexplored in this regard for tiger sharks. It is also important to note how different the attention given to this species is in the North Atlantic when compared to the South region. Lastly, we highlight that the existence of sub-populations, the lack of migratory corridors geographically connecting distinct areas used by the species, and the lack of fisheries statistics on tiger shark landings, all increase the vulnerability of this species in the South Atlantic.

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Section: Discussionsupporting

confidence: 68%

Almost nothing is known about the tiger shark in South Atlantic waters

Balanin

Hauser‐Davis

Giareta

et al. 2023

PeerJ

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“…The species also consumes carcasses, which is why it is considered a scavenger, feeding on carrion at the sea floor or in the water column (Heithaus, 2001;Bornatowski et al 2012a, b). However, dietary studies of G. cuvier based on analyses of stomach contents fail distinguishing whether these food items are obtained by active predation or by scavenging (Rada et al 2015). Here we report the capture of a G. cuvier by fishermen south of Rio de Janeiro containing a carcass of a maned sloth in its stomach and discuss the ecological implications of the finding.…”

mentioning

confidence: 99%

Consumption of a maned sloth (Bradypus torquatus Illiger, 1811) by a tiger shark (Galeocerdo cuvier Péron and LeSueur, 1822) in southeastern Brazil

Miranda¹,

Santos²,

Rodrigues³

et al. 2021

Notas Mam. Sud.

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We present the first record of maned sloth (Bradypus torquatus) consumption by the tiger shark (Galeocerdo cuvier). Our record is based on the analysis of stomach contents of a tiger shark captured off the coast of Rio de Janeiro state, southeastern Brazil. Although it is not possible to distinguish between a predation and scavenging event, we consider it likely that the sloth was consumed while dispersing between the islands of the region. We also comment on the heretofore unforeseen risks of aquatic dispersal by xenartrans.

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“…cirratum (e.g., Rada et al, 2015). Resultados similares foram observados em um estuário no norte da Austrália, em que grande similaridade no perfil de ácidos graxos foi encontrada entre os tubarões Carcharhinus leucas com outras duas espécies de tubarões (Glyphis garricki e Rhizoprionodon taylori), sugerindo que o C. leucas os está consumindo ou as três espécies estão consumindo presas semelhantes .…”

Section: Discussionunclassified

Ecofisiologia e relações tróficas de elasmobrânquios: biomarcadores como ferramentas para conservação

Rangel

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Primeiramente gostaria de agradecer a minha orientadora, Profa. Dra. Renata Guimarães Moreira Whitton, por toda confiança depositada em mim desde o mestrado, e principalmente pela oportunidade e incentivo para eu seguir meu sonho de trabalhar com fisiologia de tubarões e raias. Agradeço imensamente por todo carinho e conhecimento compartilhado. Me sinto honrada e privilegiada em tê-la como orientadora nestes sete anos.Ao meu coorientador Dr. Neil Hammerschlag, da Universidade de Miami, quem me deu a oportunidade de realizar meu sonho de trabalhar com tubarões usando métodos nãoletais. Minha grande referência desde o início da vida acadêmica, que tive a grande alegria e honra de poder colaborar e ser orientada nesta trajetória tão desafiadora do doutorado.Obrigada por ser além de um pesquisador incrível, uma pessoa sensível, compreensível e tão apaixonada pelo que faz. Você é uma enorme inspiração para mim. Agradeço à Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), pelo auxílio financeiro ao desenvolvimento deste trabalho através da bolsa de doutorado (2017/25273-0) e projeto Temático (2014/16320-7). Agradeço ao Fundo Nacional para Biodiversidade (FUNBIO) e Instituto Humanize (#98/2019) pelo financiamento para a pesquisa em Fernando de Noronha. Agradeço também ao Programa de Pós-Graduação em Fisiologia Geral e ao Instituto de Biociências, e a todos os funcionários pela colaboração e ajuda. Em especial ao técnico Vagner Alberto, por todo auxílio no laboratório. Muito obrigada pela sempre disposição e ajuda. À secretária Roseli Santos, por ser sempre tão solicita em tirar todas as dúvidas. Aos professores do Departamento de Fisiologia do IB-USP pelos conhecimentos compartilhados, pelas disciplinas ministradas e inspiração para o estudo da fisiologia. Um agradecimento em especial ao Prof. Dr. Fernando Ribeiro Gomes, que desde o início da minha trajetória em fisiologia me auxiliou extremamente com conselhos e sugestões. Aos colaboradores que tive a enorme alegria e honra de poder contar para a realização deste trabalho, ao Prof. Dr. James Sulikowski da Universidade do Estado do Arizona, MSc

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Necrophagy of a nurse shark (Ginglymostoma cirratum) by tiger sharks (Galeocerdo cuvier)

Cited by 3 publications

References 20 publications

Almost nothing is known about the tiger shark in South Atlantic waters

Almost nothing is known about the tiger shark in South Atlantic waters

Consumption of a maned sloth (Bradypus torquatus Illiger, 1811) by a tiger shark (Galeocerdo cuvier Péron and LeSueur, 1822) in southeastern Brazil

Ecofisiologia e relações tróficas de elasmobrânquios: biomarcadores como ferramentas para conservação

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