Early ontogeny of Adinia xenica (Pisces,Cyprinodontiformes): 2. Implications of embryonic resting interval for larval development |
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Authors: | Joan E R Cunningham Eugene K Balon |
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Institution: | (1) Department of Zoology, University of Guelph, Guelph, Ontario, NIG 2W1, Canada |
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Abstract: | Synopsis Larval development commences with first exogenous feeding, and ends with final remodelling of caenogenetic structures into
the definitive organs of juvenile and adult. For the intertidal cyprinodontid Adinia xenica this generally corresponds to the interval between hatching and completion of scalation. The final step of the embryo period
is a resting interval of variable duration. Embryos were induced to hatch after 2 and 10 days of this near arrest. Although
the general pattern of larval development was the same for both groups, differences were observed in the rates and order of
calcification of skeletal elements, fin differentiation and growth, and scalation. For example, embryos hatching 8 days later
in the resting interval were already pattially calcified, but completed calcification at a slower rate than the group hatching
after 2 days. These differences may be due to effects of the duration of the resting interval itself; or they may reflect
genetic variation of which age at hatching is only one manifestation. |
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Keywords: | Fish epigenesis Larva Variation Calcification pattern |
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