Body weight-length relationships in giant otters (Pteronura brasiliensis) (Carnivora, Mustelidae)

Rosas, Fernando C. W.; Rocha, Carla Soares da; Mattos, Gália Ely de; Lazzarini, Stella Maris

doi:10.1590/s1516-89132009000300010

Cited by 26 publications

(19 citation statements)

References 5 publications

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“…Total length has been widely used in predicting body mass, body volume and growth curve in Amazonian manatees. In this regard, most animal species show a regression coefficient weight/length, about 3 [31], which has been evident in several aquatic mammals [32][33][34][35] including the Amazonian manatee reporting a regression coefficient of 3.122 [27] and 4 [26]. However, the regression coefficient obtained in the present study was higher (b = 80.1) than previously reported.…”

Section: Resultssupporting

confidence: 42%

Prediction Equation of Body Weight of Amazonian Manatee (Trichechus inunguis) Calves in Captivity Using Biometry

Mendoza¹,

Loja²,

Lizana³

et al. 2017

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The objective of the study was to determine a prediction equation of body weight of Amazonian manatee calves in captivity using their biometry. It was conducted out with 7 calves (4 males and 3 females) of approximately 8 months of age and average body weight of 29.94 ± 0.055 kg, arranged in pools of sufficient size. Biometry and weighing were performed periodically, with the following measurements: body weight (BW), total curved length (TCL), total length (TL), circumference (CIR), fin width (FW), tail width (TW) and peduncle (PED). Data were subjected to Pearson correlation analysis and linear regression, using the statistical software IBM SPSS 24.0. The results showed a significant correlation (P < 0.05) between BW and TCL, TL, FW, TW, CIR and PED. Six linear simple regression equations were generated with relation to BW, using as predictor variables those that showed positive correlation. The CIR equation independent variable had the highest correlation coefficient and less error estimate (R 2 = 0.855, 2 aj R = 0.852). In addition, three linear multiple regression equations of BW were calculated using the predictor variables previously analyzed by Person correlation analysis. The equation that used all biometric measurements (TCL, TL, FW, TW, CIR and PED) had the highest coefficient of determination and the lowest estimation error to predict BW. In conclusion, the biometric measurements of TCL, TL, FW, TW, CIR and PED showed a high correlation with the BW and can be used as predictive variables of BW of manatee calves, as they are easy to be measured.

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Section: Resultssupporting

confidence: 42%

Prediction Equation of Body Weight of Amazonian Manatee (Trichechus inunguis) Calves in Captivity Using Biometry

Mendoza¹,

Loja²,

Lizana³

et al. 2017

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“…A giant otter consumes about 10 percent of its body weight of food per day, which, considering the maximum size attained by an adult (30 kg) (Rosas et al . ), corresponds to 3 kg of fish (Duplaix , Carter et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…The per capita consumption of fish was estimated at about 0.55 kg per day for a human community on the Solimões River (Batista et al 1998). A giant otter consumes about 10 percent of its body weight of food per day, which, considering the maximum size attained by an adult (30 kg) (Rosas et al 2009), corresponds to 3 kg of fish (Duplaix 1980.…”

Section: Fisherman-giant Otter Conflicts 441mentioning

confidence: 99%

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Conflict between Fishermen and Giant Otters Pteronura brasiliensis in Western Brazilian Amazon

2011

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The recovery of giant otter populations after the hunting prohibition and restriction of the pelt trade resulted in more frequent conflicts with fishermen. In this study, fisherman–giant otter conflicts were analyzed in the Uacari Sustainable Development Reserve, where giant otters are accused of interfering with fisheries by eating the fish (predation), frightening the fish away (local interference), and damaging fishing equipment (direct interference). Interference by predation was analyzed by evaluating overlap in fish species consumption between humans (measured by subsistence and commercial catches) and giant otters. The giant otter diet was assessed from fecal samples, and the human diet through questionnaires. Local and direct interferences were analyzed through fish samples using gillnets and comparing capture efficiency with and without giant otters’ presence. The overlap between human and giant otter diets was low (0.37), varied seasonally, and was smaller in the low water (0.24) than in the high water period (0.60), when both species tend to be more generalists. Overlap between fish species consumed by giant otters and those exploited by commercial fisheries was small (0.34). Giant otter presence during the experimental fishing was low (9.5%), restricted to the high water period, and did not significantly reduce the captures (U = 13, P = 0.61). The low overlap in diet may be a result of differences in preferences and fishing strategies. The conflict between giant otters and fishermen is greater in the high water period, when the income of the fisheries decreases; however, the conflict seems to be mainly motivated by the resident's prejudice against giant otters.

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“…Until recently the maximum giant otter body size mentioned in the literature was tentative and dimensions were said to vary between 1.5 to 2.4m (Cabrera and Yepes, 1940;Harris, 1968;Duplaix, 1980;Santos, 1984). However, a body weight/length relationship study carried out by Rosas et al (2009a) with captive otters revealed that adults measure typically between 1.5-1.8m and weigh up to 30kg, and there is no significant difference between size and weight of giant otter males and females in the Amazon region. The mean total length of adult otters in captivity is 1.65m (tail 65cm) and the mean weight is 22-26kg (Sykes-Gatz, 2005).…”

Section: Anatomy and Physiologymentioning

confidence: 99%

Advances in the study of giant otter (Pteronura brasiliensis): ecology, behavior, and conservation: a review

Duplaix

Evangelista

Rosas

2015

Lat. Am. J. Aquat. Mamm.

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Giant otters, once targeted by the pelt trade to near extinction, are now legally protected and have made a comeback in some parts of their range. Our state of knowledge about the behavior and ecology of this apex predator has increased substantially since the first studies in the 1970s but remains incomplete. Negative anthropogenic pressures and conflicts affecting giant otters are intensifying and now take many forms, from extensive habitat loss and degradation, pollution, ecotourism with heavy impacts, to gold mining. We review the corpus of giant otter field research and findings since 1980 and discuss new findings and our shortfall of knowledge and their implications for the long-term conservation of the species.Resumo: O abate de ariranhas para o comércio de suas peles no passado levou a espécie quase à extinção. Atualmente a caça à ariranha está proibida e algumas populações têm dado sinais de recuperação em partes de sua distribuição. O conhecimento acerca do comportamento e ecologia deste predador de topo de cadeia aumentou substancialmente desde a realização do primeiro estudo com a espécie na década de 1970, mas permanece incompleto. Conflitos e pressões antrópicas negativas têm se intensificado e abrangem desde a perda extensiva de habitat, poluição, ecoturismo pobremente manejado ou planejado, até a mineração de ouro. Neste artigo nós revisamos o conhecimento atual gerado pelas pesquisas com ariranha após 1980 e discutimos as novas informações, as deficiências de conhecimento ainda existentes e suas implicações para a conservação desta espécie. †

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Body weight-length relationships in giant otters (Pteronura brasiliensis) (Carnivora, Mustelidae)

Abstract: Few giant otters (Pteronura brasiliensis) have been measured and weighed and its actual

Cited by 26 publications

References 5 publications

Prediction Equation of Body Weight of Amazonian Manatee (Trichechus inunguis) Calves in Captivity Using Biometry

Prediction Equation of Body Weight of Amazonian Manatee (Trichechus inunguis) Calves in Captivity Using Biometry

Conflict between Fishermen and Giant Otters Pteronura brasiliensis in Western Brazilian Amazon

Advances in the study of giant otter (Pteronura brasiliensis): ecology, behavior, and conservation: a review

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