Ecology: Moitessier’s pea clam occurs in mud, silty sand, sand, silty gravel, and amongst macrophytes. It occurs from 0.5–20 m depth in the littoral zone of lakes and in wide slow rivers. It usually favors oligotrophic water with oxygen content over 50% saturation but it can tolerate some anoxic conditions over winter. Pisidium moitessierianum is relatively thermophilic, preferring lower river reaches, and has recently been able to colonize Lake Annecy, France, possibly due to increasingly warm lake water. It can, however, tolerate an annual water temperature range of 1–20ºC. Maximum population densities in the Great Lakes reach 145–178 individuals per m2 (Bishop and Hewitt 1976, Grigorovich et al. 2000, Grigorovich et al. 2003a, Holopainen and Hanski 1986, Mouthon 1999,Mouthon and Magny 2004, Smit et al. 1994, Zittler and Kuiper 2002).
Pisidium moitessierianum is ovoviviparous, hermaphroditic, can undergo self-fertilization, and generally carries 1–10 embryos. In Lake Paajarvi, Finland, it becomes sexually mature around 1 year, lays eggs in August to September, broods its offspring, releases them in July around 2 years of age, and then dies (Grigorovich et al. 2000, Holopainen 1979).
Species in the genus Pisidium are interstitial feeders, creating burrows into which they draw water by using their cilia and foot. They feed on suspended material in the water column and also directly ingest deposits from the substrate in which they live (Lopez and Holopainen 1987).
References: (click for full references)
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