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developmental phase of metamorphic climax and others used the resorption of the tail. Studies included in this review, that assessed the same life history variable at two different developmental stages, reported some differences in results depending on which developmental stage was used. Recent evidence also

In: Amphibia-Reptilia

studies which show that the response of the Eastern spadefoot toad tadpoles to pond drying is less impressive, especially if compared to the response of the North American spadefoot toads inhabiting desert environments. Keywords : amphibians, larval period, metamorphic climax, metamorphosis, phenotypic

In: Amphibia-Reptilia

of growth, differences in size between mixed group and control tadpoles were no longer significant, but control larvae were still at a significantly more advanced developmental stage. Control animals reached metamorphic climax (Gosner stage 42 = foreleg protrusion) significantly earlier than mixed

In: Amphibia-Reptilia

end of transformation, which takes less than one metamorphic stage. The cessation of foraging in Anura coincides with the transformation of the mouth and digestive tract at the beginning of the metamorphic climax. Foraging on small animals starts just after the change from a larval to a post

In: Amphibia-Reptilia

The ventral epidermis of Pelobates syriacus was studied in juveniles and adults. Towards metamorphic climax, the epidermis of the tadpole changes markedly and cells generally decrease in volume. At the same time the surface layer cells flatten. These cells form the stratum corneum under which the replacement layer is visible. Flask-shaped cells rich in mitochondria appear in the stratum spinosum and reach up to the stratum corneum. After metamorphosis the epidermis contains five to six cell layers arranged in three strata: stratum corneum, stratum spinosum, and basal layer.

In: Israel Journal of Ecology and Evolution

amphibians. After a first period of development, the gland undergoes extensive degeneration during metamorphic climax, followed by a regenerative period that brings the gland towards the adult structure (Fox, 1983). As a consequence, the relationships of the pancreas with surrounding organs are highly

In: Netherlands Journal of Zoology

the metamorphic climax before the end of the 8-day period, so only data collected after first 4 days of the recovery phase were used in analyses. R. sylvatica tadpoles originated from eggs collected on March 28, 1989 in a temporary vernal pool at the Con- cord Field Station, east of Boston

In: Amphibia-Reptilia

numbers, as compared to blood patterns of higher vertebrates. The supposed immunosuppression might lead to increased vulnerability to infections. In our laboratory populations, we have demonstrated the occurrence of internal protozoans during metamorphic climax. These ciliates are most often encountered

In: Netherlands Journal of Zoology

degeneration of larval tissues prior to restructuring into the adult forms (HAYES, 1995b). 'Titers TH and CORT increase at metamorphic climax with the rise in CORT preceding TH (JOLIVET- JAUDHT & HATEY, 1984). HAYES (1995b) showed that CORT stimulates degeneration of larval tissues, including the intestine

In: Netherlands Journal of Zoology

might expect that the antioxidant requirements of individuals will be highest (Metcalfe & Alonso-Alvarez, 2010). This may be particularly true for species that undergo metamorphosis and experience rapid transformation prior to metamorphic climax. Anuran amphibians are one taxon characterized by complete

In: Behaviour