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Montana Field Guide

Montana Field Guides

Mud Amnicola - Amnicola limosa


Global Rank: G5
State Rank: SNR

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General Description
Amnicola is a genus of very small freshwater snails that have an operculum which can seal the interior soft tissues of the shell from the environment. Length is typically only a few millimeters (mm). They can be fairly tolerant of warm water and low oxygen conditions. Generally shell color is tan to light brown.

Range Comments
Amnicola limosa is widespread throughout eastern North America, from Canada to Florida, ranging at least as far west as Utah (Berry 1943). In Montana, records occur from the eastern part of the state in prairie streams and springs to central Montana transitional trout streams.

Summary of Observations Submitted for Montana
Number of Observations: 13

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Migration
Sedentary, not known to migrate.

Habitat
Freshwater. Populations are typically found in lentic environments, but can be commonly collected in slow-moving rivers, often on woody debris.

Food Habits
Amnicola populations appear to be grazers of diatoms and other periphyton (Kesler 1981 and Cattaneo and Kalff 1986). They in turn they are preyed upon by crayfish (Lewis 2001) and sunfish (Osenberg 1989 and Bronmark et al. 1992)

Ecology
Populations are typically found in lentic environments, but can be commonly collected in the slow-moving rivers, often on woody debris. In Montana, outside of stream collections, we found them in the prairie region springs on woody debris.

References
  • Literature Cited AboveLegend:   View Online Publication
    • Brönmark, C., S.P. Klosiewski, and R.A. Stein. 1992. Indirect effects of predation in a freshwater, benthic food chain. Ecology, pp.1662-1674.
    • Cattaneo, A. and J. Kalff. 1986. The effect of grazer size manipulation on periphyton communities. Oecologia, 69(4), pp.612-617.
    • Kesler, D.H. 1981. Periphyton grazing by Amnicolalimosa: An enclosure-exclosure experiment. Journal of freshwater ecology, 1(1), pp.51-59.
    • Lewis, J.J. 2001. Three new species of subterranean Asellids from western North America, with a synopsis of the species of the region (Crustacea: Isopoda: Asellidae). Texas Memorial Museum, Speleological Monographs, 5:1-15.
    • Osenberg, C.W. 1989. Resource limitation, competition and the influence of life history in a freshwater snail community. Oecologia, 79(4), pp.512-519.
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Citation for data on this website:
Mud Amnicola — Amnicola limosa.  Montana Field Guide.  .  Retrieved on , from