Distribution of Cepaea nemoralis according to climatic regions in Spain

Mazon, L. I.; Pancorbo, M.A. Martinez de; Vicario, A.; Aguirre, A.; Estomba, A.; Lostao, C. M.

doi:10.1038/hdy.1987.19

Cited by 15 publications

(9 citation statements)

References 23 publications

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“…This possibly adaptive phenomenon finds its expression mainly in an increase of pink frequency at the expense of yellow with the distance from littoral (axis 1) but also, in quite limited directions, an increase of unbanded shells according to an increase of altitude (axis 2). The first result was observed by Guerrucci-Henrion (1966), Harvey (1971) and Mazon et al (1987) and related to an increase of rainfall or atmospheric humidity from littoral to inland. The second one was not reported, essentially because of an inadequate sampling of the whole region by Guerrucci-Henrion.…”

Section: Discussionmentioning

confidence: 75%

Spatial structure of shell polychromatism in populations of Cepaea nemoralis: new techniques for an old debate

et al. 2002

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A conspicuous shell polychromatism is observed in colonies of Cepaea nemoralis from western France (Brittany). The present study is intended to search for a spatial structure of shell features at this scale and to infer evolutionary processes from the observed patterns. We used a database of morph frequencies (six composite phenotypes were retained) measured on 213 samples regularly distributed on the whole studied area. Data analysis was based on two distinct multivariate methods leading to the following steps: (i) to search for a structure without reference to environmental conditions with a method (global principal components analysis: GPCA) which takes into account the spatial information by means of a neighbouring relationship between sampling points (Delaunay triangulation); (ii) to test the structuring power of environmental conditions by means of

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Section: Discussionmentioning

confidence: 75%

Spatial structure of shell polychromatism in populations of Cepaea nemoralis: new techniques for an old debate

et al. 2002

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“…A great number of snails have been analysed for decades from many European populations (Carter 1968;Jones et al 1977;Mazon et al 1987;Ozgo 2005;Cook 2008) and recently from some North American populations (Whitson 2005). According to these studies, the shell colour/pattern variation in these snails exhibits a complex spatial pattern in which have interesting steep morph clines in different part of its range.…”

Section: Discussionmentioning

confidence: 99%

The colour/pattern polymorphism of Philaenus spumarius (Hemiptera: Cercopidae) in the north-western Black Sea region of Turkey

2010

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The heritable elytral colour/pattern polymorphism of Philaenus spumarius in north-western Black Sea region of Turkey was investigated. A total of 2,530 adult spittlebugs, 1,020 females and 1,510 males were collected and analysed in terms of the 11 most common colour forms. Nine different phenotypes, expressed by six different alleles, were determined: populi (POP), typicus (TYP), trilineatus (TRI), marginellus (MAR), flavicollis (FLA), leucocephalus (LCE), gibbus (GIB), albomaculatus (ALB), and leucophtalmus (LOP). The common phenotypes lateralis (LAT) and quadrimaculatus (QUA) of previous studies were not encountered at all. The predominant phenotype was TYP (63%) in females and males followed by POP (31%). TRI (4%) and melanics (5%) were at close proportions. However, only one site had nine phenotypes altogether. The majority of the sites had only the POP and TYP morphs. The melanic forms were found only in females.

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“…Thirty-one populations were sampled along the 3°W meridian in an area 200 km long, and 40 km wide (Mazon et a!., 1987), fig. 1.…”

Section: Methodsmentioning

confidence: 99%

“…There are a series of coincidences between the visible (Mazon et a!., 1987) and biochemical polymorphism studied in the same area: (a). The subdivision of the populations into two zones according to biochemical polymorphism coincides with the subdivision observed for the visible.…”

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confidence: 99%