Growth and reproduction in the land snail Allopeas gracile (Hutton 1834): a laboratory appraisal

Pub Date : 2022-08-28 DOI:10.1080/07924259.2022.2115948

G. Nandy, G. Aditya

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引用次数: 1

Abstract

ABSTRACT The growth and reproduction of the graceful awl snail Allopeas gracile (Hutton 1834) (Gastropoda: Subulinidae) were evaluated in the laboratory. Observations on single individual and multiple individuals showed similar growth pattern fitted with the von Bertalanffy growth model. A fecundity schedule of the snail was constructed using the daily reproductive outputs of the snails in cohort and in isolated state. The net reproductive rate (R0) and the finite rate of increase (λ) of single individuals (R0 = 124.33 ± 14.67 SE, λ = 1.03 ± 0.003 SE) were lower than the individuals reared in cohort (R0 = 774.55 ± 147.49 SE, λ = 1.115 ± 0.006 SE). The generation time (Tc) of individuals in competition was 107.89 ± 7.92 SE days, while single individuals had longer generation time of 199.39 ± 7.24 SE days. The longevity, the shell size and the shell length, body weight and the fecundity of A. gracile exhibited correspondences as well as provided evidences of the tradeoff in the life history traits. Information on the growth and reproduction of the snail A. gracile will therefore be suitable to assess the life history feature and serves as an input for framing the strategies for its population regulation.

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陆地蜗牛异豌豆（Hutton 1834）的生长和繁殖：实验室评估

摘要对Hutton 1834(腹足目:细锥体蜗牛科)的生长和繁殖进行了实验研究。对单个个体和多个个体的观察显示出相似的生长模式，符合von Bertalanffy生长模型。利用群体和隔离状态下蜗牛的日繁殖量，构建了蜗牛的繁殖力表。个体净繁殖率(R0)和有限繁殖率(λ) (R0 = 124.33±14.67 SE， λ = 1.03±0.003 SE)均低于群养个体(R0 = 774.55±147.49 SE， λ = 1.115±0.006 SE)。竞争个体的世代时间(Tc)为107.89±7.92 SE d，单个体的世代时间较长，为199.39±7.24 SE d。纤毛虫的寿命、壳的大小和壳的长度、体重与繁殖力呈对应关系，为纤毛虫的生活史性状的权衡提供了证据。因此，关于蜗牛A. gracile的生长和繁殖的信息将适合于评估生活史特征，并作为制定其种群调节策略的输入。

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