Density-dependent growth and reproduction of the apple snail, Pomacea canaliculata:: a density manipulation experiment in a paddy field

被引:22
作者
Tanaka, K
Watanabe, T
Higuchi, H
Miyamoto, K
Yusa, Y
Kiyonaga, T
Kiyota, H
Suzuki, Y
Wada, T
机构
[1] Kyushu Natl Agr Expt Stn, Kumamoto, Japan
[2] Kumamoto Plant Protect Office, Kumamoto, Japan
[3] Kumamoto Prefectural Agr Res Ctr, Kumamoto, Japan
[4] Natl Agr Res Ctr, Tsukuba, Ibaraki 305, Japan
[5] Hokuriku Natl Agr Expt Stn, Joetsu, Japan
[6] Yokohama Plant Protect Stn, Yokohama, Kanagawa, Japan
来源
RESEARCHES ON POPULATION ECOLOGY | 1999年 / 41卷 / 03期
关键词
body size; density effect; fecundity; population dynamics; rice pest; survival rate;
D O I
暂无
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 [生物信息与计算生物学]; 0713 [生态学];
摘要
To examine density dependence in the survival, growth, and reproduction of Pomacea canaliculata, we conducted an experiment in which snail densities were manipulated in a paddy field. We released paint-marked snails of 15-20mm shell height into 12 enclosures (pens) of 16m(2) at one of five densities -8, 16, 32, 64, or 128 snails per pen. The survival rate of released snails was 95% and was independent of snail density. The snail density had a significant effect on the growth and egg production of individual snails. This density dependence may have been caused by reduced food availability. The females at high density deposited fewer and smaller egg masses than those at low density, and consequently produced fewer eggs. The females at densities 8 and 16 deposited more than 3000 eggs per female, while the females at density 128 oviposited only 414 eggs. The total egg production per pen was, however, higher at higher snail density. The survival rates of juvenile snails were 21%-37% and were independent of adult density. The juvenile density was positively correlated with the total egg production per pen and hence was higher at higher adult density. However, the density of juveniles larger than 5mm in shell height, i.e., juveniles that can survive an overwintering period, was not significantly different among density treatments. These results suggest that snail density after the overwintering period is independent of the density in the previous year. Thus, density dependence in growth and reproduction might regulate the population of P. canaliculata in paddies.
引用
收藏
页码:253 / 262
页数:10
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