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Roles of Diet Protein and Temperature in the Growth and Nutritional Energetics of Juvenile Slider Turtles, Trachemys scripta
Journal article

Roles of Diet Protein and Temperature in the Growth and Nutritional Energetics of Juvenile Slider Turtles, Trachemys scripta

Harold W. Avery, James R. Spotila, Justin D. Congdon, Robert U. Fischer, Edward A. Standora and Susan B. Avery
Physiological zoology, v 66(6), pp 902-925
01 Nov 1993
DOI: https://doi.org/10.1086/physzool.66.6.30163746
Featured in Collection :   UN Sustainable Development Goals @ Drexel

Abstract

Animal digestion Diet Digestion Feces Food Food consumption Lizards Protein digestion Turtles Young animals
We determined the effects of dietary protein and$T_{a}$on growth rates, food consumption rates, digestion rates, and digestive efficiencies of juvenile slider turtles (Trachemys scripta). Results from this study provide a clearer understanding of how these environmental factors interact in influencing body sizes and growth rates of individuals in wild slider turtle populations. Changes in plastron length, carapace length, and body mass were significantly greater for T. scripta eating 25% and 40% crude protein diets than for those eating 10% crude protein. Those consuming 10% crude protein showed significant decreases in body mass and plastron length over a 13-wk period. Individuals at$T_{a}'s$of 15°, 22°, 28°, or 34° C had food ingestion rates (kJ wk⁻¹) that increased markedly with an increase in$T_{a}$. Increasing dietary crude protein concentration increased turtle ingestion rates and influenced the positive effect of$T_{a}$. Increasing dietary crude protein concentration alone did not significantly affect turtle consumption rates but did significantly influence the positive effect of$T_{a}$. Digestive efficiencies were very high (because of the pelleted diet). Those turtles that ate at 15° C had a digestive efciency of 99.5%, as compared with 98.3% at 22° C, 94.8% at 28° C, and 95.8% at 34° C. Dietary protein concentration did not influence the digestive efficiencies of T. scripta. These data suggest that dietary protein is an important nutritional component to the growth of juvenile slider turtles and that elevated thermal conditions, combined with a high dietary protein availability, may explain the very high growth rates of slider turtles in some wild populations.

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Collaboration types
Domestic collaboration
Web of Science research areas
Physiology
Zoology
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