Influence of temperature on survival, growth and fecundity of the freshwater snail Indoplanorbis exustus (Deshayes)

Abstract

To note the effect of temperature on survival, growth and fecundity, newly hatched (zero day old) snails Indoplanorbis exustus were cultured at 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees and 35 degrees C constant temperatures and room temperature (17.5 degrees-32.5 degrees C). Individuals exposed to 10 degrees C died within 3 days while those reared at 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees C and room temperature survived for a period of 6, 27, 18, 16, 12 and 17 weeks respectively. An individual added on an average 0.21 mm and 0.45 mg, 0.35 mm and 7.94 mg, 0.63 mm and 15.5 mg, 0.81 mm and 27.18 mg, 1.07 mm and 41.48 mg and 0.78 mm and 31.2 mg to the shell diameter and body weight respectively at those temperatures per week. The snails cultured at 15 degrees C died prior to attainment of sexual maturity. On an average, an individual produced 31.9 and 582.77, 54.86 and 902.18, 56.01 and 968.45, 49.32 and 798.68 and 62.34 and 1143.97 capsules and eggs respectively at 20 degrees, 25 degrees, 30 degrees, 35 degrees C and room temperature (17.5 degrees-32.5 degrees C).

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).…”

Recent range expansion of an intermediate host for animal schistosome parasites in the Indo-Australian Archipelago: phylogeography of the freshwater gastropod Indoplanorbis exustus in South and Southeast Asia

“…This strongly suggests that proto- Indoplanorbis might have originated in the humid subtropical plains of Nepal or in unstudied southern adjacent areas such as northern India as suggested by Liu et al [30]. It is unlikely that this tropical species group originated in a more northern region where the highland water temperatures are drastically colder and thus inhibit the completion of the life cycle [63]. However, more extensive sampling in this region as well as in southwestern Asian countries (e.g.…”

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“…Indoplanorbis exustus produces about 60 egg capsules in its average life span of four months (Raut et al 1992). Under conditions similar to those in the experiments described in this paper, it is likely that a single P. bridgesi in one of the most effective size classes could destroy all these egg capsules within three weeks.…”

“…Indoplanorbis exustus deposits 2-43 (average 20) eggs per capsule (Islam 1977;Raut and Ghosh 1985;Raut 1986;Raut et al 1992). The results indicate that large individuals of P. bridgesi are capable of destroying around three egg capsules in 24 hours, thus destroying at least 60 embryonic-stage individuals of I. exustus daily.…”