Oxyloma retusa; Succineidae; color polymorphism; distribution; dispersion; behavioral ecology
Oxyloma retusa is a land snail found only along moist margins of freshwater wetlands and lakes. This study quantifies the dispersal pattern of O. retusa along permanent and temporary wetlands and considers the environmental factors to which this snail responds. On a lake shore, snail density peaked in the second or third meter from the water's edge but snails were present in decreasing numbers up to 7 meters inland. In field experiments, marked snails, initially distributed evenly along a shore transect, assumed a similar dispersion pattern within 72 hours. Two color morphs had overlapping but zonal dispersions, the amber morph farther inland than the dark. In drying ponds, snails followed the retreating shoreline. In reflooding of such ponds snails responded by crawling with the water's leading edge or ascending emergent vegetation. It is clear that O. retusa actively selects a precise microhabitat. This habitat selection appears dependent on a combination of physical and biotic factors acting separately and in combination.
Proceedings of the Iowa Academy of Science
© Copyright 1985 by the Iowa Academy of Science, Inc.
Lannoo, Michael J. and Bovbjerg, Richard V.
"Distribution, Dispersion, and Behavioral Ecology of the Land Snail Oxyloma retusa (Succineidae),"
Proceedings of the Iowa Academy of Science: Vol. 92:
, Article 6.
Available at: http://scholarworks.uni.edu/pias/vol92/iss2/6