Maturation in the Parthenogenetic Snail, Potamopyrgus jenkinsi Smith, and in the Snail Peringia ulvaE (Pennant)

The relationship between the ability of brackish water invertebrates to regulate Na and K and the extent to which the radioactive fission product 137Cs can be accumulated has been studied.The brackish water isopod Sphaeroma hookeri and the gastropod Potamopyrgus jenkinsi have been acclimatised to a wide range of sea-water dilutions. Unfed Sphaeroma can survive in sea-water concentrations of 100–2·5%, while Potamopyrgus can live fairly indefinitely in concentrations of 50–0·1%. Measurements of Na and K in the whole animals of both species and in the blood of Sphaeroma have been made. Salt movements are quite rapid and acclimatization to new media is achieved by both species in less than 10 h. Concentration factors for inactive K in particular increase to high values in the more dilute media.Uptake of the isotopes 42K and 137Cs from solution has been examined in both species over a range of sea-water concentrations. All of the body K is exchangeable with 42K and in Sphaeroma exchange of 42K between the blood and tissues is so rapid that the body surface appears to be the limiting factor in the uptake of the isotope. Both species exchange 42K more rapidly in the higher concentrations of sea water and one reason for this may be the existence of an exchange diffusion component of exchange which increases as the salinity of the medium is raised. Indirect evidence suggests that the excretion of 42K in urine is probably not an important factor in exchange.

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THE ECOLOGY OF POTAMOPYRGUS JENKINSI (SMITH) IN NORTH WEST ENGLAND WITH A NOTE ON MARSTONIOPSIS SCHOLTZI (SCHMIDT)

Journal of Molluscan Studies ◽

10.1093/oxfordjournals.mollus.a065375 ◽

1977 ◽

Keyword(s):

North West ◽

Potamopyrgus Jenkinsi

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L’extension de Potamopyrgus jenkinsi (Smith, 1889) en Corse (juillet 1973)

Annales de Parasitologie Humaine et Comparée ◽

10.1051/parasite/1974493343 ◽

1974 ◽

Vol 49 (3) ◽

pp. 343-347 ◽

Cited By ~ 1

Author(s):

N. Leger ◽

P. Leger

Keyword(s):

Potamopyrgus Jenkinsi

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XVIII.—Records of Potamopyrgus jenkinsi (Smith) in Scottish Fresh Waters over Fifty Years (1906–56)

Proceedings of the Royal Society of Edinburgh Section B Biology ◽

10.1017/s0080455x00000564 ◽

1957 ◽

Vol 66 (4) ◽

pp. 360-373 ◽

Cited By ~ 1

Author(s):

W. Russell Hunter ◽

T. Warwick

Keyword(s):

West Coast ◽

The West ◽

England And Wales ◽

Fresh Waters ◽

Rate Of Spread ◽

Outer Hebrides ◽

Molluscan Species ◽

Potamopyrgus Jenkinsi

SynopsisThis note presents in summary the recorded occurrences of Potamopyrgus jenkinsi (Smith) in fresh waters in Scotland over the fifty years since it was first reported. Apart from isolated occurrences in the Outer Hebrides, in the Caithness-Orkney area, and in the Borders—Solway area, the records appear to reflect a gradual dispersal (1906—56) from an origin on the Tay, over the Tay and Forth drainage areas, and thence perhaps through the Midland Valley to the west coast. This dispersal has been slower than the rate of spread of the same species through England and Wales earlier in the century, but has been rapid compared with the rates of dispersal assumed for other molluscan species.

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