RESEARCH PAPER
Life cycle and population dynamics of Discus rotundatus (O. F. Müller, 1774) (Gastropoda: Pulmonata: Endodontidae)
 
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Department of Systematics and Zoogeography, Institute of Zoology, Wrocław University, Poland
Submission date: 1998-12-15
Acceptance date: 1999-02-15
Publication date: 2020-07-13
 
Folia Malacol. 1999;7(1):5–17
 
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ABSTRACT
The following life history traits of D. rotundatus (O. F. Müll.) were established based on field and laboratory observations: fully calcified eggs ca 1 mm in diameter, of a size correlated with the number of parent’s whorls; 1–11 eggs per clutch; 1–178 eggs per lifetime, in 1–36 clutches; incubation period 14–36 days; egg cannibalism with a strong preference for conspecific eggs; quick growth (33–35 days per whorl) prior to maturity and slow growth in mature snails, resulting from energy expenditure for egg-laying; sexual maturity at 5.5 whorls (2nd–3rd year of life); life span 2.5–3.5 years. Isolated individuals produce fewer eggs of lower viability than individuals kept in groups, they lay their eggs later and at a larger size. Most eggs in the laboratory arelaid in June, in thefie ld themaximum of there productivepe riod falls in July/August.
 
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eISSN:2300-7125
ISSN:1506-7629