Selection in the polymorphic land snail Cepæa nemoralis
نویسندگان
چکیده
منابع مشابه
History or current selection? A molecular analysis of 'area effects' in the land snail Cepaea nemoralis.
We have used molecular variation in microsatellite and mitochondrial DNA to throw light on the origins of enigmatic geographical patterns, known as 'area effects', in the shell polymorphisms of the land snail Cepaea nemoralis. Our aim was to assess the relative importance of recent selection and historical events in the formation of these patterns. On the Marlborough Downs in Wiltshire, England...
متن کاملA Comparison of Populations of the Polymorphic Land Snail CEPAEA NEMORALIS (L.) Living in a Lowland District in France with Those in a Similar District in England.
AIN and SHEPPARD (1950, 1954) considered that natural selection, in particular visual selection exerted by predators, was an important agent influencing shell color and banding-morph frequencies in populations of Cepaea nemoralis in England. LAMOTTE ( 195 1 ) on the other hand, working with French populations, concluded that selection was of little significance in most colonies, and that random...
متن کاملNew Data on the Genetics of Polymorphism in the Snail Cepaea Nemoralis L.
A REVIEW of the remarkable polymorphism in the European land snail Cepaea nemoralis L. and of the various interpretations based on it has been given in a previous issue of this journal (CAIN and SHEPPARD 1954). Since the adaptive and evolutionary significance of the polymorphism is the subject of active research, a considerably better knowledge of its genetics is desirable. Subsequently, LAMOTT...
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Terrestrial gastropods are both herbivores and detritivores, but the ratio between these two modes of feeding can be highly variable over time. While previous studies have examined long-term seasonal patterns in the consumption of fresh material, mechanisms explaining short-term variation in dietary preferences have not been explored. We used faecal analysis to determine how short-term variatio...
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انتخاب نامساعد یکی از مشکلات اساسی در صنعت بیمه است. که ابتدا در سال 1960، توسط روتشیلد واستیگلیتز مورد بحث ومطالعه قرار گرفت ازآن موقع تاکنون بسیاری از پژوهشگران مدل های مختلفی را برای تجزیه و تحلیل تقاضا برای صنعت بیمه عمر که تماما ناشی از عدم قطعیت در این صنعت میباشد انجام داده اند .وهدف از آن پیدا کردن شرایطی است که تحت آن شرایط انتخاب یا کنار گذاشتن یک بیمه گزار به نفع و یا زیان شرکت بیمه ...
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ژورنال
عنوان ژورنال: Heredity
سال: 1950
ISSN: 0018-067X,1365-2540
DOI: 10.1038/hdy.1950.22