The Effects of Temperature on Growth and Reproduction of Australorbis Glabratus in the Laboratory1

Thermal effect on the life-cycle parameters of the medically important freshwater snail species Lymnaea (Radix) luteola (Lamarck)

“…This phenomenon is also well evident from the facts of variations in the length of the reproduction period and in the rates of egg production in snails exposed to 1.5 and 2.5 NaCl ‰. Similar effects of temperature on the rate of growth, reproduction, and behaviour have been noted in Lymnaea stagnalis by Vaughn (1953), in Australorbis glabratus by Michelson (1961), in Bulinus (Physopsis) globosus by Shiff (1964), in Biomphalaria pfeifferi by Sturrock (1966) and Appleton (1977), in Biomphalaria glabrata by Chernin (1967), Sturrock and Sturrock (1972) and Vianey-Liaud (1982), in Biomphalaria pfeifferi by Shiff and Garnett (1967), in Bulinus truncatus and Biomphalaria alexandrina by El-Hassan (1974) and in Indoplanorbis exustus by Raut et al (1992).…”

Effect of temperature on growth, reproduction and survival of the freshwater planorbid snail, Gyraulus convexiusculus, vector of echinostomiasis

“…2) . Michelson (1961) observed complete cessation and minimum oviposition at 15'C and 20'C respectively in A . glabratus.…”

“…At 15°C and below, and above 40°C, the snails did not mature. Australorbis glabratus did not attain sexual maturity at 15 ° and 35 °C (Michelson, 1961) . Failure of B. pfeifferi to become sexually mature at 29 ° C is contrary to present observations (Ap-1 89 pleton, 1977) .…”

“…The optimum temperature for maximum breeding of A . glabratus (Michelson, 1961), B. (P) globosus (Shiff, 1964), B. pfeifferi (Sturrock, 1966 ;Appleton, 1977), B. tropicus, B. alexandrina (EI-Hassan, 1974) and L .…”

Ciclo biológico de Simpulopsis ovata (Gastropoda, Bulimulidae) em São Francisco de Paula, Rio Grande do Sul, Brasil

“…De acordo com HYMAN (1967), entre os fatores que regulam a taxa de crescimento no ciclo de vida dos pulmonados, a temperatura é o mais decisivo. Muitos moluscos terrestres e de água doce, sob baixas temperaturas, param de alimentar-se, tornando-se totalmente inativos (hibernação), ou alimentam-se muito pouco e, conseqüentemente, crescem lentamente (MICHELSON, 1961;GHOSE, 1963;HYMAN, 1967;HAUT & GHOSE, 1986;QUIJON et al, 2001).…”