Interação com a pesca: implicações na conservação da toninha, Pontoporia blainvillei (Cetacea, Pontoporiidae) no litoral do estado de São Paulo, SP

Bertozzi, Carolina Pacheco

doi:10.11606/t.21.2009.tde-29042010-171040

Cited by 6 publications

(7 citation statements)

References 23 publications

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“…The limited information available is relatively outdated and pertains mostly to the small artisanal communities. Rough estimates of bycatch within the past decade have suggested an annual mortality of 300–500 franciscanas in FMA II (Bertozzi, ; IWC, ; Ott et al, ). These estimates suggest that bycatch mortality of franciscanas in FMA II at the end of the 2000s corresponded to 4.4%–7.3% of the estimated size of the FMA II population, numbers that are largely considered unsustainable for small cetacean populations (Wade, ) and the franciscana in particular (e.g., Danilewicz et al, ; Secchi, ; Secchi et al, ).…”

Section: Discussionmentioning

confidence: 99%

Distribution, habitat use, and abundance of the endangered franciscana in southeastern and southern Brazil

Sucunza

Danilewicz

Andriolo

et al. 2019

Marine Mammal Science

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The franciscana (Pontoporia blainvillei) is endemic to coastal waters from Brazil to Argentina. The species is regarded as one of the most threatened cetaceans in South America due to high bycatch levels. Four management units (FMAs) were defined throughout the species’ range. FMA II includes states along southeastern and southern Brazil, and represents one of the least known units. Recently, genetic analysis proposed that FMA II comprises two distinct populations and its range should be divided into FMA IIa and IIb. In December 2008 and January 2009 aerial surveys were conducted to assess the distribution and to estimate abundance of franciscanas off FMA II. A total of 54 groups were seen (average group size = 2.76, SE = 0.17) in shallow (mean depth = 7.15 m, SE = 7.08) coastal habitats (average distance from the shore = 6.48 km, SE = 6.28). Abundance corrected for perception and availability bias was estimated at 6,827 (CV = 0.26) franciscanas in FMA II, and at 1,915 (CV = 0.32) and 4,353 (CV = 0.24) franciscanas in FMA IIa and FMA IIb, respectively. This study indicates that, at least during the summer, franciscanas aggregate in shallow coastal habitats. Current estimates of incidental mortality in FMA II correspond to 4.4%–7.3% of the estimated stock size, suggesting high, likely unsustainable bycatch.

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Section: Discussionmentioning

confidence: 99%

Distribution, habitat use, and abundance of the endangered franciscana in southeastern and southern Brazil

Sucunza

Danilewicz

Andriolo

et al. 2019

Marine Mammal Science

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“…In Brazil, the homemade devices are commonly used on the coast [18]. Studies of the artisanal fisheries in Brazil are still few and there are no accurate statistics on such activity [19,20], representing a significant gap with regard to information on the bycatch of sea turtles [21]. …”

Section: Introductionmentioning

confidence: 99%

Attitudes and local ecological knowledge of experts fishermen in relation to conservation and bycatch of sea turtles (reptilia: testudines), Southern Bahia, Brazil

Braga

Schiavetti

2013

J Ethnobiology Ethnomedicine

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BackgroundThe use of ethnoecological tools to evaluate possible damage and loss of biodiversity related to the populations of species under some degree of threat may represent a first step towards integrating the political management of natural resources and conservation strategies. From this perspective, this study investigates fishermen’s ecological knowledge about sea turtles and attitudes towards the conservation and bycatch in Ilhéus, Southern Bahia, Brazil.MethodsFishermen experts semi-structured interviews were performed using snowball sampling method. The interviews consisted of a series of questions relating to the fishermen’s profile, structure and work equipment, the local ecological knowledge of fishermen about sea turtles and bycatch, a projective test, attitudes towards turtle conservation and beliefs and taboos regarding turtles. Indicators for quantitative comparisons of respondents in terms of their broad knowledge and attitudes towards turtle conservation were created. Correlation analyses were made between indicators of knowledge and attitude as well as the relationship between education level and knowledge and attitudes.ResultsThirty experts were interviewed for the study. The local ecological knowledge and attitudes of fishermen towards the conservation of sea turtles were respectively medium (0.43) and moderate (0.69) according to experts (based on Likert scale and Cronbach’s Alpha). Potential areas of spawning were reported from Barra Grande to Una covering the entire coast of Ilhéus. Methods for identifying the animal, behavior, and popular names were described by fishermen. The most recent captures of turtles were attributed to fishing line, but according to the respondents, lobster nets and shrimp traps are more likely to capture turtles. Knowledge and attitudes were weakly inversely correlated (r = −0.38, p = 0.04), and the education level of the respondent showed a positive correlation with positive attitudes towards turtle conservation (H = 8.33; p = 0.04). Life history, habitat, specific and exogenous taboos, beliefs and the use of hawksbill turtle to make glasses and other handcrafts are also reported in the study.ConclusionsMonitoring of spawning areas, preservation of traditional practices, strategies to moderate the use of fishery resources and the local ecological knowledge/attitudes can provide data to improve the conservation practices and management of sea turtles.

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“…Since there was no data of age and reproductive status for FMA II, franciscana dolphins were divided according to total length as described by Bertozzi, 2009: mature/adult males (larger than 107 cm), mature/ adult females (larger than 119 cm); pups (smaller than 95 cm), juveniles (size between adult and pup).…”

Section: Reproductive Status Estimationmentioning

confidence: 99%

PBDE levels in franciscana dolphin (Pontoporia blainvillei): Temporal trend and geographical comparison

Leonel¹,

Sericano²,

Secchi³

et al. 2014

Science of The Total Environment

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Interação com a pesca: implicações na conservação da toninha, Pontoporia blainvillei (Cetacea, Pontoporiidae) no litoral do estado de São Paulo, SP

Cited by 6 publications

References 23 publications

Distribution, habitat use, and abundance of the endangered franciscana in southeastern and southern Brazil

Distribution, habitat use, and abundance of the endangered franciscana in southeastern and southern Brazil

Attitudes and local ecological knowledge of experts fishermen in relation to conservation and bycatch of sea turtles (reptilia: testudines), Southern Bahia, Brazil

PBDE levels in franciscana dolphin (Pontoporia blainvillei): Temporal trend and geographical comparison

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