Abstract
Potamopyrgus (Hydrobia) jenkinsi (Smith, 1980) was found in eight out of eleven aquatic habitats studied in detail in the north west of England, the highest numbers being found in harder waters. Monthly samples over 13 months showed a permanent population of adults producing offspring throughout the year during long periods of reproduction.
Varieties of snail were observed, differing in shape of the aperture and presence of a keel on the shell, the proportions of these varieties being significantly different between sites. The type of aperture shape may be related to the chloride content of the water, and like the presence of a keel, may exhibit a negative binomial distribution within the populations. Marstoniopsis (Bythinella) scholtzi (Schmidt) showed a similar pattern of reproduction to P.jenkinsi.
Varieties of snail were observed, differing in shape of the aperture and presence of a keel on the shell, the proportions of these varieties being significantly different between sites. The type of aperture shape may be related to the chloride content of the water, and like the presence of a keel, may exhibit a negative binomial distribution within the populations. Marstoniopsis (Bythinella) scholtzi (Schmidt) showed a similar pattern of reproduction to P.jenkinsi.
| Original language | English |
|---|---|
| Pages (from-to) | 208-216 |
| Journal | Journal of Molluscan Studies |
| Volume | 43 |
| Issue number | 3 |
| Publication status | Published - Dec 1977 |
Keywords
- Aperture shape
- Hydrobia
- Life cycle
- Potamopyrgus
- Water hardness
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