Experimental studies of the exploitation and overcrowding of a natural population of the Roman snail, Helix pomatia L.

Woyciechowski, Michał

doi:ISSN 0420-9036

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Experimental studies of the exploitation and overcrowding of a natural population of the Roman snail, Helix pomatia L. Woyciechowski, Michał

Object structure

Experimental studies of the exploitation and overcrowding of a natural population of the Roman snail, Helix pomatia L.

Studies of a population of the Roman snail

Woyciechowski, Michał

Polska Akademia Nauk. Instytut Ekologii

Polish Scientific Publishers

Warszawa

1980

Strony 401-421 : ilustracje ; 24 cm ; Bibliografia na stronach 420-421 ; Streszczenie w języku polskim

Czasopismo/Artykuł

terrestrial snails ; Helix pomatia ; Ojców National Park ; field experiments ; population ; exploitation ; overcrowding ; density regulation

Surveys of the Roman snails were carried out in the Ojców National Park, at three experimental sites. In a population that had been rejuvenated due to exploitation a reduction in fecundity was found; with an increased mobility of individuals this meant a lack of partners for mating. Food supplies and migrations are factors determining the density. An experimental increase in density caused by man accelerates the mobility and reduces the fecundity. Emigration was more often found among introduced individuals, differing in size from the native ones. On the basis of the annual shell increments it has been established that the growth of an individual usually continues for 4 years, often still after the attainment of sexual maturity, whereas the body size of individuals from local habitats varies as a result of selection.

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