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Guo, D. W., & Ji, X. (2001). Influence of incubation temperature on embryonic use of material and energy in the chinese soft-shelled turtle (pelodiscus sinensis). Acta Zoologica Sinica, 47(5), 512–517.
Added by: Admin (17 Aug 2008 18:54:47 UTC) |
| Resource type: Journal Article BibTeX citation key: Guo2001 View all bibliographic details  |
Categories: General Keywords: Pelodiscus, Pelodiscus sinensis, Schildkröten = turtles + tortoises, Trionychidae, Trionyx, Zeitigung = incubation Creators: Guo, Ji Collection: Acta Zoologica Sinica |
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| Abstract |
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Trionyx We had eggs of Chinese soft-shelled turtle (Pelodiscus sinensis) incubated at seven constant temperatures ranging from 23C to 34C and one fluctuating temperature regime (22.3C32.8C) to assess influence of incubation temperature on embryonic use of material and energy. Our results revealed that more dry matter, lipids, minerals, and energy were transferred from the egg into the hatchling when eggs were incubated at moderate (27C and 28C) and fluctuating temperatures. Hatchlings from these temperature treatments contained more ash and higher energy contents in carcass as well as larger fat bodies than did those from extremely high (33C and 34C) and low (23C) temperatures. Incubation temperature significantly affected embryonic allocation of energy among carcass, residual yolk, and fat bodies, resulting in hatchlings differing in energy contents of these compartments. Hatchlings incubated at 27C and 28C were similar in total energy contents, but hatchlings incubated at 27C contained less amounts of energy in the residual yolk. Similarly, hatchlings incubated at 23C and 34C did not differ in total energy contents, but hatchlings incubated at 34C contained less amounts of energy in the residual yolk. These observations imply significant influence of incubation temperature on transference of energy during embryogenesis. Constant temperatures rarely occur in nature, so incubating eggs at fluctuating temperatures could provide more ecologically relevant data. Our results showed that hatchlings incubated at fluctuating temperatures did not differed from those incubated at constant temperatures ranging from 24C to 30C, although these eggs were once exposed to temperatures close to 23C and 34C for a brief period on a daily basis. Therefore, we conclude that eggs of P. sinensis can be incubated over a wide range of constant temperatures without significant modifications to energy contents of hatchlings and the range of suitable incubation temperatures can be substantially widened when eggs are incubated at fluctuating temperatures.
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