منابع مشابه
Asexuality: The Insects that Stick With It
One hope of trying to understand why sex is so powerful and prevalent a mode of reproduction relies on the rare examples of animals that persist long-term without having sex. Now, several species of stick insects join that illustrious circle.
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SYNOPSIS. In the experiments stick insects walk on an inclined substrate such that the legs of one side of the body point uphill and the legs of the other side point downhill. In this situation the vertical axis of the body is rotated against the inclination of the substrate as if to compensate for the effect of substrate inclination. A very small effect has been found when the experiment was p...
متن کاملStick insects: parthenogenesis, polyploidy and beyond
The most common way animals reproduce is bisexuality, namely through the mixis of male and female gametes. Bisexual reproduction relies on the Mendelian mechanism, although several additional modes also occur. In turn, the Mendelian inheritance of genetic variability stands on the meiotic process, which entrains recombination and chromosome reshuffling within the frame of a balanced segregation...
متن کاملThe Feeding Habits of Mesosauridae
Mesosauridae comprises the oldest known aquatic amniotes which lived in Gondwana during the Early Permian. Previous work in the Uruguayan mesosaur-bearing Mangrullo Formation suggested that mesosaurids lived in an inland water body, inferred as moderately hypersaline, with exceptional preservational conditions that justified describing these strata as a Fossil-Lagerstätte. Exquisitely preserved...
متن کاملFeeding habits and stomach contents of Silver Sillago,
The study investigated the stomach content of Sillago sihama in Hormuzgan Province waters located in the northern Persian Gulf from October 2009 to March 2010. The stomach analysis was carried out using frequency of occurrence and numeric methods. Diatoms, blue- green algae and dinoflagellates constituted main food of plant origin. Diatoms were found to be the most preferable food of...
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ژورنال
عنوان ژورنال: Nature
سال: 1936
ISSN: 0028-0836,1476-4687
DOI: 10.1038/1381058b0