INCIPIENT INTRASPECIFIC ISOLATING MECHANISMS IN RANA PIPIENS
نویسندگان
چکیده
منابع مشابه
Premating Isolating Mechanisms Among Three Species of the Rana pipiens Complex in Texas and Southern Oklahoma
Prior tests of interfertility among 3 partly sympatric species of the Rana pipiens complex (R. berlandieri, R. blairi, and R. sphenocephala) have indicated poor development of postmating reproductive isolation. However, hybrids are uncommon in sympatric populations, so premating isolation must exist. Among the species studied, temporal isolation predominates. In areas of tri-sympatry, the breed...
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Competition is known to decrease growth and development rate in tadpoles, but the physiological basis for this phenomenon is poorly understood. We hypothesized that competition results in increased production of stress hormones and that these hormones are responsible for the suppression of growth and development. To test this hypothesis, we measured whole-body corticosterone content in premetam...
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The epidermis of adult Rana pipiens has been studied by electron microscopy and histological and histochemical methods. It was found that the epidermis is engaged in the production of both keratin and mucus. The basal cells are mainly filled with tonofilaments, whereas the cells located in the mid-portion of the epidermis contain both tonofilaments and mucous granules. Golgi vesicles and endopl...
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BRACHET (1934,1950) has proposed that the oxidation source for the anaerobic development of the early amphibian embryo is primarily from a pool of materials such as oxidized glutathione. Inasmuch as an investigation of the defective lactate producing ability of hybrid embryos (Barth, 1946) was contemplated, it seemed desirable to reinvestigate the problem of the source of anaerobic oxidations i...
متن کاملPossible mechanisms responsible for the reduced intestinal flora in hibernating leopard frogs (Rana pipiens).
Mechanisms and factors that normally control the large intestinal flora were investigated to determine whether changes in these parameters could account for the decreased bacterial concentration and facultative nature of the flora found in hibernating frogs. It appeared that low temperatures and limited nutrients were the main factors responsible for the decrease in the bacterial concentration ...
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ژورنال
عنوان ژورنال: Genetics
سال: 1946
ISSN: 1943-2631
DOI: 10.1093/genetics/31.3.304