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Utilization of the invasive plant Impatiens parviflora DC. by the snail Columella edentula Draparnaud in oak-hornbeam forests

100%

Piskorz R., Urbanska M.

Acta Societatis Botanicorum Poloniae

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2007

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tom 76

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nr 1

This study investigated the extend to which the snail Columella edentula is more strongly associated with the small balsam Impatiens parviflora than with other plants in the herb layer of an oak-hornbeam forest, and to interpret the character of the interaction Impatiens parviflora - Columella edentula. Numbers of C. edentula and rates of colonization were compared on various plant species under natural and laboratory conditions. Seasonal variation in snail abundance on I. parviflora was observed on permanent plots. The leaf injuries caused by C. edentula were localized in respect of the morphological and anatomical structure of leaves. The results show that I. parviflora is one of the plant species of the herb layer that are most abundantly colonized by this snail in oak-hornbeam forest. Snail finds a plant particularly suitable as a place for resting. The most favoured attachment site is on the underside of the leaf, along the midrib, which provides the highest and relatively stable humidity, as well as protection from direct sunlight and predators. I. parviflora is also a food for the snails, but they do not eat these fragments of leaves where calcium carbonate is accumulated.

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Shell thanatocenoses in the Raclawka valley near Cracow

70%

Alexandrowicz S. W.

Folia Malacologica

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1999

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tom 07

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nr 4

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Contribution to the biology of ten vertiginid species

61%

Myzyk S.

Folia Malacologica

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2011

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tom 19

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nr 2

Laboratory and field observations on Vertigo angustior Jeffreys, V. antivertigo (Draparnaud), V. moulinsiana (Dupuy), V. pusilla O. F. Müller, V. pygmaea (Draparnaud), V. ronnebyensis (Westerlund), V. substriata (Jeffreys), Truncatellina cylindrica (Férussac), Columella aspera Waldén and C. edentula (Draparnaud) provided new information on their life cycle. Genus Vertigo: the life span is 1–3 years, with most snails dying in the next year after hatching. The reproductive season lasts from half of May till the beginning of September; depending on the life span eggs are laid during 1–3 seasons. The number of eggs per lifetime varies widely, the maximum numbers are 55–79 in V. moulinsiana, pygmaea and ronnebyensis, 102–120 in V. angustior, pusilla and substriata and 218 in V. antivertigo. Most eggs are laid at the stage of one cell (even oocyte II), but in some the advancement of development indicates retention of 1–3 days. Hatching usually starts in the second half of June and lasts till the second half of September. Only some of the snails reach maturity in the year of hatching, usually after the reproductive season. Genus Truncatellina: in the wild the life span of most individuals is about one year, some live till the age of about two years. Eggs are laid from half of June till the end of August (in laboratory maximum 11 eggs); hatching takes place from July till the end of September. Genus Columella: in the laboratory C. aspera lays eggs from half of May till the beginning of September (maximum 5 eggs); hatching starts at half of June and continues till the end of September. C. edentula in the laboratory lays eggs at half of April, and juveniles hatch at the end of May and beginning of June.

Ograniczanie wyników

2 Folia Malacologica

1 Acta Societatis Botanicorum Poloniae

1 Alexandrowicz S. W.

1 Myzyk S.

1 Piskorz R.

1 Urbanska M.

1 2011

1 2007

1 1999

Utilization of the invasive plant Impatiens parviflora DC. by the snail Columella edentula Draparnaud in oak-hornbeam forests

Shell thanatocenoses in the Raclawka valley near Cracow

Contribution to the biology of ten vertiginid species