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ANNEXE III INFLUENCE OF FLUCTUATING WATER POTENTIAL ON EGGS, HATCHING SUCCESS AND HATCHLINGS IN A TURTLE WITH FLEXIBLE-SHELLED EGGS VIRGINIE DELMAS 1 , ANTOINE CADI 1,2 AND ANNE-CAROLINE PREVOT-JULLIARD 1 1 Laboratoire Ecologie, Systématique et Evolution, CNRS -UMR- 8079, Université Paris-Sud, Bât. 362, 91405 Orsay Cedex, France. 2 Association Noé Conservation - Fondation Nicolas Hulot, 52 bd Malesherbes, 75008 Paris, France. En préparation
Annexe III _____________________________________________ ABSTRACT Temperature and hydric conditions within the nest on development and survival of embryos and phenotypes of hatchlings has been well documented in ectothermic sauropsids. Most authors, however, have only considered constant hydric conditions within the nest, even though developmental moisture in natural settings fluctuates considerably on a daily and seasonal basis. A laboratory study was performed on 188 eggs from 26 clutches in the redeared slider turtle (Trachemys scripta elegans) to determine the effect of hydric variance on hatching success, incubation length and hatchling mass. We also tested the effect of hydric condition on survival rate after one year. Eggs were incubated on substrates with 3 different water potentials (i.e. dry, intermediate and wet) at constant temperature yielding both sexes (i.e. 28.9 ± 0.1°C). Transfers between substrates were performed every 2 days to mimic variations of hydric conditions. Hatching success was found to be independent from hydric conditions but incubation length and hatchling mass were negatively related with time spent on dry substrate, suggesting that hydric conditions may affect hatchling quality. However, moisture substrate seems to have a very short-term effect on hatchling phenotype, while sexual phenotype seems to have a great influence on mass and growth of hatchlings up to one year. 1
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N° d’ordre : UNIVERSITE PARIS-SU
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Remerciements Je remercie tout d’
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I - La tortue à tempes rouges, un
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II - Les tortues à tempes rouges,
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III - Etudes expérimentales des pr
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TURTLE, AN EXOTIC AND INTRODUCED SP
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