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PHENOTYPIC DIFFERENTIATION IN LITTORINA SAXATILIS OLIVI (MOLLUSCA, PROSOBRANCHIA) IN A SMALL AREA ON THE SWEDISH WEST COAST

Kerstin Janson

Open publisher page 43 citations

Abstract

The Littorina saxatilis species-complex exhibits two distinct morphs in the area investigated. Differences in shell morphology and number of penial glands are statistically significant (P<0.02) between populations from exposed and sheltered habitats. However, in intermediate environments intermediate specimens as well as typical specimens of both morphs are found. The differences are considered intraspecific and at least partly genetically determined, and possible selection pressures responsible are discussed.

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What this paper is about

The Littorina saxatilis species-complex exhibits two distinct morphs in the area investigated. Differences in shell morphology and number of penial glands are statistically significant (P<0.02) between populations from exposed and sheltered habitats. However, in intermediate environments intermediate specimens as well as typical specimens of both morphs are found. The differences are considered intraspecific and at least partly genetically determined, and possible selection pressures responsible are discussed.

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Available abstract

The Littorina saxatilis species-complex exhibits two distinct morphs in the area investigated. Differences in shell morphology and number of penial glands are statistically significant (P<0.02) between populations from exposed and sheltered habitats. However, in intermediate environments intermediate specimens as well as typical specimens of both morphs are found. The differences are considered intraspecific and at least partly genetically determined, and possible selection pressures responsible are discussed.

Key concepts: Prosobranchia, Biology, Mollusca, Gastropoda, Littorina, Zoology, Ecology

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PHENOTYPIC DIFFERENTIATION IN LITTORINA SAXATILIS OLIVI (MOLLUSCA, PROSOBRANCHIA) IN A SMALL AREA ON THE SWEDISH WEST COAST — Research Paper | ScholarLens