Genic variation in isolated marginal populations of the Roman Snail, Helix pomatia L.
نویسندگان
چکیده
منابع مشابه
Influence of photoperiod on the behavioral response to olfactory stimulation in the snail Helix pomatia L.
An ethanol vapor concentration of 1.6 mmol/l was used to test the diurnal variations of the olfactory response in two groups of snails, which were adapted to different light-dark cycles. The results revealed that the olfactory sensitivity to stimulation with ethanol was significantly increased during the day-time, which corresponds to the scotophase of the light-dark cycle, to which the animals...
متن کاملGenic Variation in Natural Populations
By characterizing the struggle to measure variation as a struggle between two opposing views, the classical and balance theories of population genetics, I have in part obscured the underlying problem of making a functional whole out of theory and observation. Suppose that the experiments of Wallace and of Mukai had proved beyond any reasonable doubt that new mutations were, on the average, hete...
متن کاملThe circulatory physiology of Helix pomatia. II. The isolated heart.
This work was undertaken to study the mechanical factors affecting the function of the isolated heart of Helix pomatia in order to help understand the variations in heart activity observed in intact animals. Biedermann (1884), working upon the isolated heart of Helix, observed that the frequency of beat increased with distension of the heart. Biering (1929) found that in the isolated Helix hear...
متن کاملTransmembrane outward hydrogen current in intracellularly perfused neurones of the snail Helix pomatia.
The ionic nature and pharmacological properties of the outward current activated by membrane depolarization were studied on isolated neurones of the snail Helix pomatia, placed in Na+- and Ca2+-free extracellular solutions and intracellularly perfused with K+-free solution ("nonspecific outward current"). It was shown that the amplitude and reversal potential of this current (estimated from ins...
متن کاملPotassium channels in the central nervous system of the snail, Helix pomatia: localization and functional characterization.
The distribution and functional presence of three voltage-dependent potassium channels, Kv2.1, Kv3.4, Kv4.3, respectively, were studied in the central nervous system of the snail Helix pomatia by immunohistochemical and electrophysiological methods. Cell clusters displaying immunoreactivity for the different channels were observed in all parts of the CNS, although their localization and number ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Hereditas
سال: 2009
ISSN: 0018-0661
DOI: 10.1111/j.1601-5223.1976.tb01543.x