منابع مشابه
Perception o f Common Toads
Bufo bufo, Depth Perception, Prey Catching Behaviour, Eye Accommodation, Monand Binocularity Distance estimation in prey catching was as exact in monocular toads (Bufo bufo (L.)) as in binocular ones. Application of Atropine or Miotic® had no significant effect on binocular animals, whereas in monocular toads it made accurate distance estimation impossible. The accom modative state of the eye ...
متن کاملPatterns of Reproductive Isolation in Toads
Understanding the general features of speciation is an important goal in evolutionary biology, and despite significant progress, several unresolved questions remain. We analyzed an extensive comparative dataset consisting of more than 1900 crosses between 92 species of toads to infer patterns of reproductive isolation. This unique dataset provides an opportunity to examine the strength of repro...
متن کاملFurther Hopping with Toads and Frogs
We show the value of positions of the combinatorial game “Toads and Frogs”. We present new values of starting positions. Moreover, we discuss the values of all positions with exactly one ,T F,T FFF,T F, T F. At the end, we post five new conjectures and discuss the possible future work.
متن کاملFour independent electrophoretic markers in spadefoot toads.
Four enzyme-encoding genes (Idh-1, Idh-2, Ldh-1, and Mdh-1), with alleles diagnostic for the spadefoot toads Scaphiopus multiplicatus and Scaphiopus bombifrons, were investigated in order to characterize their inheritance and linkage relationships. Electrophoretic phenotypes in the offspring of natural crosses exhibit Mendelian segregation, behaving as genotypes produced by alternative alleles ...
متن کاملDiet alters species recognition in juvenile toads.
Whether environmental effects during juvenile development can alter the ontogeny of adult mating behaviour remains largely unexplored. We evaluated the effect of diet on the early expression of conspecific recognition in spadefoot toads, Spea bombifrons. We found that juvenile toads display phonotaxis behaviour six weeks post-metamorphosis. However, preference for conspecifics versus heterospec...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1886
ISSN: 0036-8733
DOI: 10.1038/scientificamerican04241886-264