Nonadditive interactions between animal and plant diet items in an omnivorous freshwater turtle Trachemys scripta

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
Sarah S Bouchard, K A Bjorndal

Abstract

Nonadditive interactions occur when diet items interact with one another such that the net energy or nutrient gain from a mixed diet differs from that predicted by summing the gains from individual diet components. We quantified nonadditive effects between duckweed, Lemma valdiviana, and grass shrimp, Palaemontes paludosus, in the freshwater turtle Trachemys scripta. We fed turtles 100% duckweed, 100% shrimp, and two mixed diets containing 67% duckweed, 33% shrimp and 14% duckweed, 86% shrimp (dry matter basis). During each feeding trial, we measured intake, digestibility, and transit time of the diet, and upon conclusion, short-chain fatty acid concentrations in turtle digestive tracts. Digestibility was lower on the 67% duckweed diet, but higher on the 14% diet. These apparent nonadditive interactions may be due to differences in transit time of duckweed and shrimp. We believe this is the first evidence of two diet items producing opposing nonadditive effects when fed in different ratios.

References

Feb 27, 1999·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·R J SpencerI D Hume
Mar 4, 2000·Canadian Journal of Microbiology·M A OlsenS D Mathiesen
Dec 1, 2001·Annual Review of Entomology·Moshe Coll, Moshe Guershon

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Citations

Jun 30, 2009·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Donovan P German
Nov 26, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Sarah S BouchardJennifer A Berry
Apr 28, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Jian-Yi SunXiao-Yan Weng

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