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J. Moll. Stud. (1994), 60, 223-235
© The Malacological Society of London 1994

research-article

INFLUENCE OF TEMPERATURE ON SURVIVAL AND GROWTH OF TWO FRESHWATER PLANORBID SPECIES, PLANORBARIUS CORNEUS (L.) AND PLANORBIS PLANORBIS (L.)

K. COSTIL

Laboratoire de Zoologie générate et Ecophysiologie, Campus de Beaulieu, Université de Rennes 135042 Rennes Cedex, France

The survivorships and growth rates ofPlanorbarius corneus and Planorbis planorbis were measured during the whole life span of the snails at constant temperatures of 5, 10, 15, 20 and 25°C. Life expectancy tables were constructed. The maximum longevities for P. corneus (231 weeks) and P. planorbis (175 weeks) occurred at 15°C and 10°C respectively. The extreme temperatures were particularly unfavourable.

Snail growth which was expressed logarithmically was most sensitive to temperature during the exponential stage. However, if we consider a given species duringjts entire life span, there were no significant differences between temperature groups which were in order of decreasing suitability:

—P. corneus: 25, 20 and 15°C; 10°C; 5°C; —P. planorbis: 20 and 15°C; 25 and 10°C; 5°C.

Using the growth constants from the Von Berta-lanffy's model adjusted to give a gaussian curve, it was calculated that the optimum temperatures for the growth of P. planorbis and P. corneus were 19 and 20.5°C respectively. A mathematical model based on spline functions makes it possible to predict the growth of snails over a wide range of temperatures.

(Received 2 June 1993; accepted 18 November 1993)


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