Influência da paisagem na dieta de Bothrops atrox  na Amazônia oriental

Martinez, Melissa Gaste

doi:10.11606/t.64.2016.tde-23032016-152758

Cited by 1 publication

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“…The other possibility was that 400 days corresponds to an average period for incorporation of the new diet on snake tissues. This hypothesis was tested by Martinez [55] evaluating the turnover period of the δ 13 C correspondent to diets available in the natural environment, which are usually based on plants with photosynthetic cycle type C 3 , to the diet used in captivity that include lab mice fed with formulas consisted mostly by plants of photosynthetic cycle type C 4 . The isotopes were measured in blood, scales, and venom and the turnover periods of δ 13 C were always under 100 days, also ruling out the correlation between the time of the shift in venom composition to incorporation of the new diet on snake tissues.…”

Section: Discussionmentioning

confidence: 99%

Evidence for Snake Venom Plasticity in a Long-Term Study with Individual Captive Bothrops atrox

Amazonas

Freitas-de-Sousa

Orefice

et al. 2019

Toxins

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Variability in snake venom composition has been frequently reported and correlated to the adaptability of snakes to environmental conditions. Previous studies report plasticity for the venom phenotype. However, these observations are not conclusive, as the results were based on pooled venoms, which present high individual variability. Here we tested the hypothesis of plasticity by influence of confinement and single diet type in the venom composition of 13 adult specimens of Bothrops atrox snakes, maintained under captivity for more than three years. Individual variability in venom composition was observed in samples extracted just after the capture of the snakes. However, composition was conserved in venoms periodically extracted from nine specimens, which presented low variability restricted to the less abundant components. In a second group, composed of four snakes, drastic changes were observed in the venom samples extracted at different periods, mostly related to snake venom metalloproteinases (SVMPs), the core function toxins of B. atrox venom, which occurred approximately between 400 and 500 days in captivity. These data show plasticity in the venom phenotype during the lifetime of adult snakes maintained under captive conditions. Causes or functional consequences involved in the phenotype modification require further investigations.

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Section: Discussionmentioning

confidence: 99%