Key Laboratory of Agroecology and Rural Environment of Guangzhou Regular Higher Education Institutions

Guangzhou, China

Key Laboratory of Agroecology and Rural Environment of Guangzhou Regular Higher Education Institutions

Guangzhou, China
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Guo J.,South China Agricultural University | Xu W.-B.,South China Agricultural University | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Environment in the Tropics | And 7 more authors.
Chinese Journal of Applied Ecology | Year: 2014

In order to understand whether Pomacea canaliculata exhibits gender differences in cold resistance, the survival rate and supercooling point of both P. canaliculata females and males were investigated at low temperature. The changes in physiological and biochemical indices in the body of P. canaliculata before and after the winter were also examined. The results showed that the mean supercooling point of females was -6.83°C, which was significantly lower than that of the males (-6.26°C). With the arrival of winter, the amounts of bound water, glycerol, lipid and glycogen of P. canaliculata increased, while the amount of free water decreased. These indices except glycerol showed significant differences between males and females. More than 90% non-acclimated snails could survive at the temperature of 10°C for 7 days. The survival rate of snails exhibited significant differences in sex and shell height after being transferred at 5°C for 7 days. In addition, more females were recorded during field investigation. Based on these results, we concluded that the females had higher cold tolerance than the males. This finding would provide some references for further investigation of ecological adaptation, natural sex ratio and cold tolerance mechanisms of P. canaliculata.


Guo J.,South China Agricultural University | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agroecology and Rural Environment of Guangzhou Regular Higher Education Institutions
Chinese Journal of Ecology | Year: 2014

Pomacea canaliculata, the only freshwater snail among the 100 worst invasive alien species listed by the World Conservation Union, has caused incalculable agricultural and ecological harms worldwide. Owing to its wide habitat adaptability, strong adverse resistance, high reproduction rate and abundant genetic diversity, P. canaliculata can establish wild populations rapidly in new habitats, especially in some dissimilation and fragmentation environments. Defense abilities of P. canaliculata to natural enemies, bacteria and parasites are other effective ways to maintain its survival and reproduction. Declining biodiversity caused by P. canaliculata invasion can generate a vicious circle and further enhance the invasive ncidence. In this paper, invasion mechanisms of ecological tolerance, population genetic variation and reproductive growth, defense and competition capacity of P. canaliculata with native species, ecological vulnerability of invaded habitats were reviewed and summarized. Some relevant research perspectives were also put forward, with an attempt to provide basic information and references for prevention and controlling of P. canaliculata invasion. © 2014, Editorial Board of Chinese Journal of Ecology. All rights reserved.

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