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Life Table and Demographic Parameters of the Neotropical Apple Snail Asolene platae (Caenogastropoda, Ampullariidae)

Author:
Tiecher, María J., Seuffert, María E., Burela, Silvana, Martín, Pablo R.
Source:
American malacological bulletin 2017 v.35 no.2 pp. 119-125
ISSN:
2162-2698
Subject:
Pomacea canaliculata, freshwater, habitats, life tables, longevity, mortality, snails
Abstract:
Apple snails are regarded as invasive or potentially problematic species but some species may be under threat. Life tables are a useful tool to understand the growth potential of freshwater snail populations. Our aim was to estimate the demographic parameters of the Neotropical apple snail Asolene platae (Maton, 1811) to allow a quantitative comparison with invasive apple snails like Pomacea canaliculata (Lamarck, 1822). Life tables were calculated for three laboratory cohorts bred at 25 °C. Life expectancy rises abruptly up to 32–37 months after a period of high post-hatching mortality of one month. The reproductive value peaked at 15–19 months for two cohorts and at 33 months in the other one. The net reproductive rates (R₀), generation times (GT) and intrinsic rates of increase (r) were as 55.86 hatchlings, 25.7 months, and 0.188 individuals per individual per month on average, respectively. Among freshwater snails there is a clear inverse relationship between r and GT while R0 has a minor positive influence. The values of GT and r for A. platae are among the highest and lowest, respectively, calculated for freshwater snails at 24–26 °C. These low values of r under optimum conditions indicate a relatively low potential of A. platae populations to increase in new habitats or to recover from disturbances.
Agid:
5944851