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Monday, July 13, 2020 | History

2 edition of Area effects in Cepaea found in the catalog.

Area effects in Cepaea

A. J. Cain

Area effects in Cepaea

by A. J. Cain

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  • 10 Currently reading

Published by Royal Society in London .
Written in English


Edition Notes

Statementby A.J. Cain and J.D. Currey.
SeriesPhilosophical Transactions of the Royal Society of London, Series B. Biological Scienes -- No.726, Vol.246, pp. 1-81 3 January 1963
ContributionsCurrey, John D.
The Physical Object
Pagination81p.
Number of Pages81
ID Numbers
Open LibraryOL13766587M

(review Wright , chapter 2); (5) appar-ent operation of the shifting balance process in the Shorthorn breed of cattle (McPhee & Wright ). White agrees with Cain and Currey in stat-ing that "the areas involved (in area effects) are far too large for the observed distribution of phenotypes to be due to genetic drift or founder effects.". Of the snail shells, placed on the grasslands, (%) were destroyed. In the remaining snail shells we found nests with brood cells of three Osmia species (colonization rate of %). The colonization rate of the habitat specialist O. aurulenta was positively affected by habitat area but not habitat connectivity (Table 1, Fig. 2).Author: Sebastian Hopfenmüller, Andrea Holzschuh, Ingolf Steffan-Dewenter.

datasets have provided data to the NBN Atlas for this genus.. Browse the list of datasets and find organisations you can join if you are interested in participating in a survey for . ↑ Cain A.J. and Currey J.D. Area effects in Cepaea. Phil Trans B ↑ Cain A.J. and Currey J.D. Climate and selection of banding morphs in Cepaea from the climate optimum to the present day. Phil Trans B ↑ Cain A.J. and Sheppard P.M. Selection in the polymorphic land snail Cepaea nemoralis (L). Heredity 4.

The Canadian Environmental Protection Act, is an important tool in Canada for the protection of the n of CEPA provides for a parliamentary review of the administration of the Act every five years after the coming into force of the act. Geographic Variation, Speciation and Clines explores the origins and development of geographic variation, divergence, and speciation. In particular it is concerned with genetic divergence as it is usually found on continents, among groups of populations isolated only by distance. Although earlier writers on this topic considered the effects of geography and dispersal, intense geographic.


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Area effects in Cepaea by A. J. Cain Download PDF EPUB FB2

The snails Cepaea nemoralis and C. hortensis show an extensive and stable polymorphism involving the colour and banding pattern of the shell. The surveys on the Berkshire Downs, the Purbeck Hills and part of lowland Somerset reported here show, together with previous ones, that both species can occur in lowland and chalk upland localities, but the distribution of the two species in any one.

Populations of the polymorphic land snail Cepaea nemoralis (L.) from Deepdale, Derbyshire, UK, sampled in –67, showed a pattern of area effects, with steep clines among groups of populations. Ochman H, Jones JS, Selander RK. Molecular area effects in Cepaea.

Proc Natl Acad Sci U S A. Jul; 80 (13)– [PMC free article] Ochman H, Jones JS, Selander RK. Large scale patterns of genetic differentiation at enzyme loci in the land snails Cepaea nemoralis and Cepaea hortensis. Heredity (Edinb) Feb; 58 (Pt 1)–Cited by: Cain A.J.

and Currey J.D. Area effects in Cepaea. Phil Trans Roy Soc BCain A.J. and Currey J.D. Area effects in Cepaea on the Larkhill Artillery Ranges, Salisbury Plain.

Linnaean Soc London (Zoology) 45, Cain A.J. and Currey J.D. Ecogenetics of a population of Cepaea nemoralis subject to strong area. 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 by: Cepaea is a genus of medium-sized air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family shells of species within this genus are often brightly colored and patterned with stripes.

The two species from this genus, the common and widespread C. nemoralis and C. hortensis, have been model species for early studies of genetics and natural : Gastropoda.

Currey & Cain (), using Cepaea nemoralis (L.) and C. hortensis (Müller), two species with an extensive shell-character polymorphism, were able to show a considerable alteration in southern England in the proportions of the bandless form in C. nemoralis from the hypsithermal (c. BC) to the present day, consistent with climatic Cited by: There is geographical variation in body colour in the land snails Cepaea nemoralis and C.

hortensis along a transect of 88 samples from the north of Scotland to the Pyrenees. Paler body colour is Cited by:   Populations of Cepaea nemoralis and C. hortensis have been sampled in a small area in north-west Worcestershire.

No clear ecological separation between the two species is Cited by: The EPA Green Book provides detailed information about area National Ambient Air Quality Standards (NAAQS) designations, classifications and nonattainment status.

Information is current as of the Green Book posted date and is available in reports, maps and data downloads. Geographic Range.

The northern distribution boundary of Cepaea nemoralis is in Scotland and southern Scandinavia. The range extends south to the Iberian Peninsula and Croatia in the south.

Capaea nemoralis is found in the western and eastern coasts of both Ireland and the UK, Belgium, and France. The eastward distribution extends to the northwestern areas of Poland. Yellow, pink or brown may predominate in C. nemoralis, but area effects in banding seem due mostly to the excess or defect of the modifier M^3 which reduces the five-banded phenotype to the form.

Population size and morph frequency in a long-term study of Cepaea nemoralis. Proc. Soc. Lond. B – Cain A. J., Currey J. Differences in interactions between selective forces acting in the wild on certain pleiotropic genes of Cepaea.

Nature – Cain A. J., Currey J. The causes of area effects. Cepaea snail on hordeum, Yerevan jpg 1, × 3,; KB Escargot du 4, × 3,; MB FMIB Parc Ombrage par des 1, × ; KB. These references are in PubMed. This may not be the complete list of references from this article.

CAIN AJ. So-called non-adaptive or neutral characters in evolution. CAIN AJ, SHEPPARD PM. Selection in the polymorphic land snail Cepaea nemoralis.

Heredity (Edinb) Dec; 4 (3)– Articles from Genetics are provided here courtesy Cited by: The effect of experience on the selective behaviour of song thrushes feeding on artificial populations of Cepaea (Held.). Genetica – Genetica – ().Cited by: of the book, "Properties of Clines," Endler first shows that the size of clines formed in computer sim-ulation when there is no selection are too small to explain area effects in Cepaea.

Then he discusses two basic selection models: the gradient model, where there is a gradual change in fitness over space, and. Abstract. We describe a massive polymorphism for shell colour and pattern in Donacilla cornea, a shallow-burrowing bivalve which inhabits the mid-littoral of sandy and stony beaches in southern and western the four sites studied, the one where the substrate was a mixture of small stones and sand contained the highest densities of by: The first part is a review of area effects in Cepaea.

We discuss the original definitions and explanations, emphasizing the debate of adaptationist vsstochastic approaches, but arguing that the contrast of historical contingency vs. selective fit to environment forms a more fruitful and fundamental context in discussing the origin of area effects.

datasets have provided data to the NBN Atlas for this species. Browse the list of datasets and find organisations you can join if you are interested in participating in a survey for species like Cepaea (Cepaea) hortensis (O. Müller, ). EPA-R February EFFECTS OF TEMPERATURE ON GROWTH AND REPRODUCTION OF AQUATIC SNAILS By Henry van der Schalie Elmer G.

Berry University of Michigan, Ann Arbor, MI Contract No. Project FOG Project Officer Dr. Donald I. Mount National Water Quality Laboratory Congdon Boulevard Duluth, Minnesota Prepared for .RESULTS Cepaea nemoralis is more common and more widespread, than Cepaea hortensis. Each species is polymorphic in the Cepaea nemoralis, the area sampled was divided into two zones, the north and south-facing slopes of Iberian Mountains (Table II).Phenotype differences appeared, principally in the patterns of bands (Fig.

2), whereas, for coloured,Cited by: 4.This page was last edited on 12 Octoberat Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may