"Variation in the shell colour and banding polymorphism in the land snail Cepaea nemoralis was studied in 260 populations in the region of Gda\u0144sk, northern Poland. Unlike in other regions of Poland, many populations contain brown shells. Populations from shaded habitats have higher frequencies of brown than those from open and intermediate habitats, largely at the expense of yellow shells. Nearly all brown shells are also unbanded. Apart from this disequilibrium, banding morphs among yellow and pink shells show no relationship to habitat. There are no broad geographical trends in morph-frequencies, but there are very strong correlations among populations very close together, revealed both by pairwise analysis and Moran\u2019s I. Principal Component Analyses show that these correlations relate to overall genetic similarity at the loci involved." . "[B0FCB057F4DD]" . "0006-3088" . . . "187390" . "At the north-eastern extremity: variation in Cepaea nemoralis around Gda\u0144sk, northern Poland" . "17"^^ . . . "Cameron, Robert A.D." . "Hors\u00E1k, Michal" . "Biologia" . . "At the north-eastern extremity: variation in Cepaea nemoralis around Gda\u0144sk, northern Poland"@en . "6" . . "SK - Slovensk\u00E1 republika" . "Variation in the shell colour and banding polymorphism in the land snail Cepaea nemoralis was studied in 260 populations in the region of Gda\u0144sk, northern Poland. Unlike in other regions of Poland, many populations contain brown shells. Populations from shaded habitats have higher frequencies of brown than those from open and intermediate habitats, largely at the expense of yellow shells. Nearly all brown shells are also unbanded. Apart from this disequilibrium, banding morphs among yellow and pink shells show no relationship to habitat. There are no broad geographical trends in morph-frequencies, but there are very strong correlations among populations very close together, revealed both by pairwise analysis and Moran\u2019s I. Principal Component Analyses show that these correlations relate to overall genetic similarity at the loci involved."@en . "RIV/00216224:14310/11:00053753!RIV12-MSM-14310___" . "66" . "At the north-eastern extremity: variation in Cepaea nemoralis around Gda\u0144sk, northern Poland" . . "Cepaea nemoralis; polymorphism; natural selection; founder effects"@en . . . . . "14310" . "RIV/00216224:14310/11:00053753" . . . . . "At the north-eastern extremity: variation in Cepaea nemoralis around Gda\u0144sk, northern Poland"@en . "O\u017Cgo, Ma\u0142gorzata" . . "1"^^ . "Bogucki, Zdzislaw" . "I, Z(MSM0021622416)" . . . "4"^^ .