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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 96, No. 4, 2001, pp. 577-581
Bioline Code: oc01087
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 96, No. 4, 2001, pp. 577-581

 en The Effect of Isolation on the Life-history Traits of Pseudosuccinea columella (Pulmonata: Lymnaeidae)
Alfredo Gutiérrez; Gloria Perera; Mary Yong & Lin Wong

Abstract

A population of Pseudosuccinea columella was raised under laboratory conditions and its life tables were determined in isolated and paired snails. Isolated snails were significantly larger in shell size than paired snails from five weeks of age onward. Also, statistically significant differences were found for the number of eggs per mass per individual from week 5 to 9, isolated snails exhibiting the highest values. The intrinsic and finite rates of increase were greater in isolated than in paired snails. Either an inhibition of the reproductive output between individuals or the advantage of selfing may be the cause of the differences in this species, acting as a possible mechanism that increase the fitness of isolated snails.

Keywords
Lymnaeidae, Pseudosuccinea columella, life history traits, isolation

 
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