Intraspecific effects of population density on the feeding habits, activity and growth in the giant african land snail Archachatina marginata Swainson (Pulmonata: Achatinidae)

Abstract

The effect of different population densities in relation to feeding, activity and growth rates of Archachatina marginata were found to be inversely related with increase in population density.  Snails were more active and grew faster in lesser populated vivaria.  Ripe pawpaw and plantain fruits were preferred mostly and they supported faster growth and development.  The growth analysis between the weight and shell circumference gains were correlated which suggested that the nutrients absorbed enhanced uniform development of the shell and body tissues.  The difference between the day and night-time activities of the snail was significant.  Snails were more active at night during which feeding, copulation and movement mostly takes place.  The activities of both the juveniles and adult snails were reduced in vivaria pre-treated with mucus in relation to untreated vivaria.  Unfavourable environmental conditions led to aestivation a physiological adaptive process exhibited by some snails during this study.