Aproveitamento de alimentos de origem animal pela tartaruga-da-amazônia: Podocnemis expansa criada em cativeiro

Almeida, Cauê Guion de; Abe, Augusto Shinya

doi:10.1590/s0044-59672009000100023

Cited by 4 publications

(2 citation statements)

References 20 publications

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“…In the mid-1970s, Brazilian government conservation efforts supported its reproduction in captivity and also in situ conservation programs. Afterward, commercial breeding farms were legalized, accounting for more than 80 farms in Northern and Midwest Brazil (Vogt 2008;Almeida and Abe 2009;Cantarelli et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Iron deposition in the liver and guts of giant South American freshwater turtle Podocnemis expansa (Schweigger 1812) from a commercial breeding farm in Acre, Brazil

Conrado

Oliveira

Medeiros

et al. 2022

MSJ

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Wildlife turtles are endangered species because of the traditional capture of eggs and adult animals in Northern Brazil, such as the South American freshwater turtles (Podocnemis expansa). Successful conservation efforts in order to keep them in captivity and fed commercial fish chow may lead to physiological changes and systemic pathologies. Thus, in the present study, were evaluated the liver and digestive tract of 14 giant South American freshwater turtles microscopically and described the histopathological changes related from commercial breeding and captivity. There was the presence of ferric ions in the stomach epithelium and macrophages with ferric beads in crypts and intestinal villi. In the liver, it was observed disruption of hepatic architecture and liver hemosiderosis. There was the presence of large melano-macrophage centers (MC) filled with ferric ions throughout the liver parenchyma. The size of MC ranged from 25.3 x 31.3 μm up to 196.7 x 168.7 μm and occupied between 9.0 ± 2.9% and 37.5 ± 9.8% of the liver parenchyma area. Those findings can be influenced by age, malnourishment, or ammonia intoxication with posterior anemia, but all those hypotheses must be tested in the future.

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Section: Introductionmentioning

confidence: 99%

Iron deposition in the liver and guts of giant South American freshwater turtle Podocnemis expansa (Schweigger 1812) from a commercial breeding farm in Acre, Brazil

Conrado

Oliveira

Medeiros

et al. 2022

MSJ

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“…A determinação das reais necessidades nutricionais das tartarugas amazônicas ainda é desconhecida, e a preferência alimentar varia se o indivíduo se encontra na natureza ou em cativeiro. Na natureza, onde é majoritariamente herbívora, o consumo de itens de origem vegetal varia conforme o local onde está inserida a população, porém sempre se sobrepõe ao consumo de itens de origem animal, variando entre 86% na Venezuela e 100% no Estado do Pará (ALMEIDA et al, 1986;TERÁN et al, 1992TERÁN et al, , 1995; já em cativeiro a espécie é alimentada com ração de peixe contendo níveis de proteína entre 28% e 30% (ALMEIDA & Abe, 2009). Portanto, em ambiente natural, o hábito alimentar da espécie se caracteriza como onívoro, com clara tendência a predileção pela dieta herbívora.…”

Section: Importância Dos Estudos De Dieta Nas Tartarugas De áGua Doceunclassified

Estimativa da taxa de turnover e fator de discriminação isotópico em espécies de quelônios

Consolmagno¹

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Estimation of turnover rate and discrimination factor in species of chelonians The use of tracers such as stable carbon and nitrogen isotopes is crescent and complements the conventional techniques used in the studies referring to the diet in wild animals. This is possible because the isotopic value of the items used in the diet reflects their isotopic values on the tissues. The resulting isotopic difference called the discrimination factor or fractionation is associated with the metabolic processes required for nutrient incorporation to occur. The object of the study was to measure the incorporation time of isotopes into plasma and blood cells, components of re-portable non-lethal "tissue", and to determine the discriminant factor of five species of freshwater chelonians: Podocnemis expansa (Amazonia tortoise), Podocnemis unifilis (tracajá), Phrynops geofroanus (geoffroy´s side necked turtle), Trachemys scripta (red-eared slider turtle) and Trachemys dorbigni (d'orbigny's slider). The isotopic differences of 10 adult individuals of each species kept in captivity were measured through shifting diets with different isotopic values. With the diet variation, carbon and nitrogen turnover was estimated between 7 and 185 days by non-linear exponential regression, when the new fractionation factors were estimated. The turnover time for the chelonians species varied from 72 to 337 days for carbon, and from 29 to 270 days for the plasma nitrogen. In blood cells, the turnover ranged from 3 to 373 days for carbon, and from 51 to 216 days for nitrogen. Discrimination factors that were, in average, close to zero for carbon and between 3 and 4‰ for nitrogen ranged from 1.01 to 3.28‰ for 13 C and-0.76 to 0.49‰ for 15 N in plasma , and from 1.49 to 3.98‰ for 13 C and 0.99 to 4.69 for 15 N in blood cells, with a decrease of 3.7‰ and an increase of 6.2‰, respectively for carbon and nitrogen in the new diet. The difference found between the discrimination factors calculated before and after the diet shift, showed that stable isotopes incorporation probably occurs in a heterogenous way in tissues. According to the literature it was possible to analyze that factors such as isotopic memory, metabolic routes and reptiles characteristic elements are possibly linked to slower turnover, different from endothermic animals in which this process is faster.

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Different dietary protein levels for Podocnemis unifilis subadult farming: hematological and biochemical assessment

Brasiliense

Mendonça

Almeida

et al. 2021

Journal of Applied Aquaculture

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Aproveitamento de alimentos de origem animal pela tartaruga-da-amazônia: Podocnemis expansa criada em cativeiro

Cited by 4 publications

References 20 publications

Iron deposition in the liver and guts of giant South American freshwater turtle Podocnemis expansa (Schweigger 1812) from a commercial breeding farm in Acre, Brazil

Iron deposition in the liver and guts of giant South American freshwater turtle Podocnemis expansa (Schweigger 1812) from a commercial breeding farm in Acre, Brazil

Estimativa da taxa de turnover e fator de discriminação isotópico em espécies de quelônios

Different dietary protein levels for Podocnemis unifilis subadult farming: hematological and biochemical assessment

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