Multiple substitutions and reduced genetic variability in sharks

Tavares, Weydder; Rodrigues‐Filho, Luis Fernando da Silva; Sodré, Davidson; Souza, Rosália Furtado Cutrim; Schneider, Horácio; Sampaio, Iracilda; Vallinoto, Marcelo

doi:10.1016/j.bse.2013.02.004

Cited by 18 publications

(21 citation statements)

References 54 publications

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“…Molecular techniques based on sequences of mitochondrial (mtDNA) or nuclear DNA have been widely used in studies of population genetics (Cruz, 2013;Pinhal, 2010;Tavares et al, 2013;Veríssimo et al, 2012;Rodrigues-Filho, et al, 2009;Dudgeon et al, 2012;Palmeira et al, 2013). The regions of the mitochondrial genome most used for these studies include the cytochrome b (Cyt b) gene and the Control Region (CR), which has been used in a large number of population genetics studies of sharks Tavares et al, 2013).…”

Section: Molecular Methods As a Tool For The Conservation Of The Elasmentioning

confidence: 99%

“…The regions of the mitochondrial genome most used for these studies include the cytochrome b (Cyt b) gene and the Control Region (CR), which has been used in a large number of population genetics studies of sharks Tavares et al, 2013). Given its relatively high mutation rates, the CR is more adequate for the analysis of the recent evolutionary history of a population, providing useful evidence for effective conservation and management practices.…”

Section: Molecular Methods As a Tool For The Conservation Of The Elasmentioning

confidence: 99%

See 1 more Smart Citation

Why implement measures to conserve the diversity of Elasmobranchs? The case of the northern coast of Brazil

Gemaque¹,

Monteiro²,

Gomes³

et al. 2017

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Section: Molecular Methods As a Tool For The Conservation Of The Elasmentioning

confidence: 99%

Section: Molecular Methods As a Tool For The Conservation Of The Elasmentioning

confidence: 99%

Why implement measures to conserve the diversity of Elasmobranchs? The case of the northern coast of Brazil

Gemaque¹,

Monteiro²,

Gomes³

et al. 2017

Self Cite

View full text Add to dashboard Cite

“…The molecular identiication of the diferent species of hammerhead shark (genus Sphyrna) provides an excellent example of the utility of these molecular tools for the conservation and management of these organisms [65]. In these sharks, the head is the principal diagnostic trait for the morphological determination of species, although it is invariably removed prior to the landing of catches, impeding the reliable identiication of specimens encountered in ish markets.…”

Section: Elasmobranchs and Isheriesmentioning

confidence: 99%

Introductory Chapter: The Elasmobranchs as a Fishery Resource

Filho¹,

Sales²

2017

Chondrichthyes - Multidisciplinary Approach

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“…In eastern Brazil, elder and middle-aged fishers have reported a decline in its abundance . Also, low levels of genetic diversity were verified in northeastern region, suggesting that populations of S. tudes have suffered a marked decline (Tavares et al, 2013). Based on this information, specialists inferred that populations of this species have declined at least 80% in Brazilian waters (Brasil, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Data on landings of S. tudes and even on its basic life history traits in Brazil are scarce. The size of maturity and reproduction was investigated in northeastern Brazil and the genetic diversity described to northern region (Tavares et al, 2013). Other studies simply include this species in checklists (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary

Giglio

Bornatowski

2016

Neotrop. ichthyol.

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Coastal hammerheads have suffered from overexploitation and environmental degradation. We interviewed 79 artisanal fishers to verify fishery aspects, temporal changes in catches and biological aspects of the smalleye hammerhead, Sphyrna tudes, in a marine protected area on Abrolhos Bank, Brazil. Data were compared between three generations of fishers: young, middle-aged and old. Fishers´ age varied between 17 and 88 years. We verified significant reductions in the weight of individuals caught by younger fishers. The main types of fishing gear used to catch S. tudes were gill nets and longlines. Overfishing through gill nets and trawl fisheries were mentioned as the cause of S. tudes population collapse in the region. The shark's diet as reported by fishers consisted of fish, crab and shrimp; austral summer was the reproductive season. A strong similarity was verified between fishers' knowledge and biological data. We suggest as plausible strategies to conserve the local population of S. tudes the reduction of net fisheries impact through zoning and establishment of no take areas. These steps can help to initiate the recovery of this depleted species.Tubarões martelo costeiros têm sofrido com a sobrepesca e degradação ambiental. Foram entrevistados 79 pescadores artesanais para verificar aspectos da pesca, mudanças temporais nas capturas e aspectos biológicos de Sphyrna tudes em uma área marinha protegida no Banco dos Abrolhos, Brasil. Os dados foram comparados entre três gerações de pescadores: novos, meia idade e mais velhos. A idade dos pescadores variou entre 17 e 88 anos. Verificaram-se reduções significativas no peso dos indivíduos capturados pelos pescadores mais jovens. Os principais petrechos usados para captura de S. tudes foram redes de emalhe e espinhel. Pescadores mencionaram que o colapso da população local de S. tudes foi decorrente do excessivo uso de redes de emalhe e pelas pescarias de arrasto. A dieta reportada foi peixes, caranguejos e camarões e a época de reprodução foi o verão. Uma forte similaridade foi verificada entre o conhecimento dos pescadores e dados biológicos. São sugeridas como estratégias plausíveis para conservar a população local de S. tudes a redução do esforço das pescas com rede através de zoneamento e estabelecimento de áreas de exclusão de pesca. Esses passos podem ajudar a iniciar a recuperação de espécies depletadas.

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Multiple substitutions and reduced genetic variability in sharks

Cited by 18 publications

References 54 publications

Why implement measures to conserve the diversity of Elasmobranchs? The case of the northern coast of Brazil

Why implement measures to conserve the diversity of Elasmobranchs? The case of the northern coast of Brazil

Introductory Chapter: The Elasmobranchs as a Fishery Resource

Fishers' ecological knowledge of smalleye hammerhead, Sphyrna tudes , in a tropical estuary

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