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- Title
On a snail's chances of becoming a year old.
- Authors
Spight, T. M.
- Abstract
Mortality rates of Juvenile Thais were obtained by comparing fecundities to size structures and to counts of juveniles. Although about 1000 eggs are produced annually by a female, rarely do 10 eggs survive to age 1. For Thais lamellosa (Gmelin) both egg and yearling crops varied by an order of magnitude over a Sir period. Size of yearling population was not correlated with egg production. Equally many T. lamellosa survived to age I in. 2 adjacent populations. Numbers reaching age I increased annually from 1968 to 1973, in both populations and the change parallelled an. increase in food abundance. 90-99 % of batchlings died within 2 months of hatching, but 10-3570 of survivors lived for & further 10 months.
- Subjects
SNAILS; MORTALITY; POPULATION; TEENAGERS; DEATH; FERTILITY
- Publication
Oikos, 1975, Vol 26, Issue 1, p9
- ISSN
0030-1299
- Publication type
Article
- DOI
10.2307/3543270