Temporal and spatial patterns of abundance in the gastropod assemblage of a macrophyte bed

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Although gastropods are more common and diverse in macrophyte beds than in areas without littoral vegetation, little is known of fine-scale patterns of abundance within macrophyte beds, or changes in abundance of species through time. I present data here on such patterns in the gastropod assemblage found in Carrol Lake, Wisconsin. The assemblage was quite diverse, with 13 species, four of which had mean densities greater than 100/m2. The assemblage was dominated by small, thick-shelled species, especially Amnicola limosa Say, 1817. Gastropod density decreased across two field seasons, although trends within each field season were for increases with time in the abundance of most species, especially in shallower habitats. At the micro-habitat scale, abundances of the most common species were positively correlated, perhaps because they prefer to colonize the same macrophytes, based on the results of laboratory macrophyte-choice experiments.

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American Malacological Bulletin

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