Development of salinity tolerance in the marine pulmonate Amphibola crenata (Gmelin)

Little, Colin; Pilkington, Margaret C.; Pilkington, J. B.

doi:10.1016/0022-0981(84)90084-4

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…Field studies corroborate these findings (Shumway and Marsden, 1981;Shumway, 1981) and support the findings of Watters (1964) who reported survival times of 6-7 days in freshwater, 16-18 days in seawater and 3-4 months in damp mud. Little et al (1984) found that A. crenata, collected from the same area as in the present study, survived for several days in fresh water but failed to maintain a constant osmotic pressure. This fresh water contained 0.14 mM I" 1 chloride and would appear to be from the city water supply.…”

Section: Discussionmentioning

confidence: 77%

Osmotic Balance in a Marine Pulmonate,Amphibola crenata

Shumway

Freeman

1984

Marine Behaviour and Physiology

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The pulmonate mud-snail Amphibola crenata is an osmoconformer in 25%-125% sea water, its haemolymph being slightly hyperosmotic and hyperionic to the medium. It maintains its haemolymph markedly hyperosmotic in media below 25% sea water and in freshwater, in which it survives for a week or longer. On exposure to dilute or concentrated media, water which enters or leaves the tissues preferentially enters or leaves the cells. Regulation of cell volume towards initial values is accomplished within 5 days. Measurements of changes in cell volume, and of distribution of tissue water between the intracellular and extracellular compartments, in snails moved from 100% sea water into dilute or concentrated media, and in snails moved back to 100% sea water, indicate that mechanisms of cell volume regulation are minimal in ca 60-65% sea water. Changes in the concentration of tissue free amino acids are in accord with current theories of mechanisms of isosmotic intracellular regulation. The results are discussed in the light of the taxonomic, evolutionary and ecological status of Amphibola as a shore-living, primitive, marine representative of a predominantly terrestrial and freshwater group of gastropod molluscs.

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Section: Discussionmentioning

confidence: 77%

Osmotic Balance in a Marine Pulmonate,Amphibola crenata

Shumway

Freeman

1984

Marine Behaviour and Physiology

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“…The ability to absorb salts against a concentration gradient is important to a hypertonic regulator such as Amphibola which, in dilute media, maintains the blood concentration above that of the environment, but produces an isotonic urine (Little, Pilkington and Pilkington, 1984). Appropriate morphology and the ability to transport dyes suggest that the ciliated band makes a contribution to extrarenal ion transport.…”

Section: Discussionmentioning

confidence: 99%

“…They were maintained in tanks in the laboratory containing a shallow layer of 50% sea water covering a layer of mud. The tanks were illuminated with 'Grolux' fluorescent tubes to encourage algal growth, and enriched with a weekly addition of about 30 ml 'Difco' Plate Count Medium containing a suspension of three species of bacteria (Pilkington and Pilkington, 1984). Illumination was on a light-dark cycle, 18 h on, 6 hoff.…”

Section: Methodsmentioning

confidence: 99%

A respiratory current in the mantle cavity ofAmphibola crenata(Mollusca, Pulmonata).

Pilkington

Little

Stirling

1984

Journal of the Royal Society of New Zealand

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“…An attempt will now be made to do this for several invertebrate groups. Osmotic pressure of medium (mOsm.kg ) Figure 1 Osmotic pressures of the blood of some soft-bodied invertebrates in relation to the osmotic pressure of the medium; dotted lines show the lines of no regulation: (A) the marine/estuarine pulmonate gastropod Amphibola crenata (data from Little et al 1984) and the marine/estuarine prosobranch gastropod Assiminea grayana (data from Little & Andrews 1977); (B) the brackish-water oligochaete Nais elinguis (data from Little 1984) and the freshwater prosobranch gastropod Viviparus viviparus (data from Little 1965a).…”

Section: Osmotic Tolerance Versus Osmotic Regulationmentioning

confidence: 99%

Comparative physiology as a tool for investigating the evolutionary routes of animals on to land

Little

1989

Earth and Environmental Science Transactions of the Royal Socie

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Although many physiological characteristics are very labile, it is proposed that some are stable enough to provide evidence concerning the routes by which terrestrial animals moved on to land. Osmotic tolerance and osmoregulatory ability are investigated first. Marine littoral invertebrates tolerate wide osmotic changes but osmoregulate little. Freshwater invertebrates osmoregulate well, but over a narrow range. Terrestrial prosobranchs of the family Pomatiasidae, which have wide tolerance, may have originated directly from the sea. The Cyclophoridae, which are intolerant, may have moved to land from fresh water. Isopods and talitrid amphipods may all have had direct marine origins with no freshwater phase. Secondly, terrestrial animals of marine origin may have blood with higher osmotic pressures than those passing through fresh water. In prosobranchs, isopods and amphipods, the evidence agrees with the conclusions suggested from character one. Thirdly, the production of hypo-osmotic urine in terrestrial animals may be evidence of freshwater origin. The evidence again supports the initial suggestions about prosobranchs and amphipods. It is concluded that because there is little selection pressure acting on these characters on land, they can be used as evidence of ancestry. Possible use of further characters is discussed.

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Development of salinity tolerance in the marine pulmonate Amphibola crenata (Gmelin)

Cited by 10 publications

References 9 publications

Osmotic Balance in a Marine Pulmonate,Amphibola crenata

Osmotic Balance in a Marine Pulmonate,Amphibola crenata

A respiratory current in the mantle cavity ofAmphibola crenata(Mollusca, Pulmonata).

Comparative physiology as a tool for investigating the evolutionary routes of animals on to land

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