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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

CHANGES IN THE DISTRIBUTION PATTERN OF TYRIAJACOBAEAE DURING THE LARVAL PERIOD by E. VAN DER MEIJDEN ( Zoological Laboratory, University of Leiden, The Netlterlands) Publication of the "Meijendel-comité", Nieuwe Serie, No. 34 SUMMARY 1. Egg-batch distribution in the Cinnabar Moth is related to

In: Netherlands Journal of Zoology

) until stage 42, which coincides with the emergence of forelimbs and indicates the end of the larval period (Walsh, 2010 ). Predation threat was created by placing a small plastic tub (16 cm diameter × 7 cm depth) with perforations (1.2 mm 2 holes) wrapped with nylon mesh in the center of the rearing

In: Amphibia-Reptilia
Author: Björn Lardner

Baltic island of Gotland. Larvae from mainland and island R. arvalis populations were raised in inter- as well as intraspecific regimes of different densities. Gotlandian larvae had a longer larval period and a lower growth rate than mainland conspecifics at the provided densities. The Gotlandian larvae

In: Amphibia-Reptilia

Introduction Environmental variation is very common. In amphibians, variations in the length of the larval period and growth rate represent adaptive responses to the variable environments of spawning sites (Wassersug, 1974 , 1975 ; Wilbur, 1980 ). The relative opportunity for growth

In: Amphibia-Reptilia

temperatures in mid-April for the natural pond for the tadpoles used in this experiment averaged 25°C). Thus, we speculated that tadpoles would have a longer larval period and larger size at metamorphosis at low temperature because they may prefer cool temperatures in a natural pond. Materials and methods

In: Animal Biology

). In this study, we tested whether relatedness affects fitness-related metamorphic traits (length of larval period, size at metamorphosis, body condition, and survival rate) in a laboratory experiment with Bufo gargarizans minshanicus (Stejneger, 1926). This animal is a typical explosive breeder

In: Animal Biology

worst (x-.-x) visual angles within the "orientation group" vary considerably, the main improvement of visual resolving power definitively happens in the second half of the larval period between hatching and free swimming. Fig. 2. Effect of light deprivation on visual acuity of rainbouw trout during

In: Behaviour

Rana perezi have the shortest larval periods, of about two months. Rana perezi is also characterized by its delay in temporal use of the ponds in comparison with the other species. The flexibility of the larval period season is considered an adap- tation to the unpredictability of temporary ponds. Thus

In: Amphibia-Reptilia

genetic divergence for foraging behaviour between the species. Larval turning and bending were not affected by hybridization, suggesting a similar genetic architecture for each of these activities in both species. Retreat and rearing were observed during the whole of larval period in D. pavani , while

In: Behaviour