Journal ArticleDOI
The effects of temperature and humidity on the nocturnal activity of different shell colour morphs of the land snail Arianta arbustorum
TLDR
Yellows are more active than browns at high humidities, but less active at low, and are likely to be behaviourally more responsive than Browns in an environment of fluctuating humidities.Abstract:
The noctural activities of the phenotypic shell colour morphy and age classes (adults and juveniles) of Arianta arbustorum were recorded 1 day week-1 for 4 weeks in several laboratory microclimatic conditions. Six constant temperatures between 3 and 18dC and four levels of relative humidities between 34 and 98% were maintained. A light regime of 16 h light: 8 h dark was used. There are highly significant differences in activity at different levels of adaptation temperature and relative humidity. The interaction between these factors is significant. There are no significant differences in nocturnal activity between the two phenotypic shell colours nor between the two age classes, but the interaction between morph and relative humidity is significant. The interaction between age classes and relative humidity is also significant. Yellows are more active than browns at high humidities, but less active at low. They are therefore likely to be behaviourally more responsive than browns in an environment of fluctuating humidities. This result is discussed in relation to the maintenance of the polymorphism.read more
Citations
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Journal ArticleDOI
Life history of the land snail arianta arbustorum along an altitudinal gradient
Bruno Baur,Christian Raboud +1 more
TL;DR: Although proximate factors like temperature explain most of the variation in life history, evidence was obtained also for genetic divergence among populations and the results match the predictions of the adversity selection model well.
Journal ArticleDOI
A two–stage model for Cepaea polymorphism
TL;DR: A simple simulation shows that migration coupled with selection which fluctuates but is not centripetal, may retain polymorphism for sufficiently long to account for the patterns the authors see today.
Journal ArticleDOI
Patterns of dispersion, density and dispersal in alpine populations of the land snail Arianta arbustorum (L.) (Helicidae)
TL;DR: In studying populations of the land snail Arianta arbustorum in the eastern Swiss Alps, juvenile and subadult snails were found to be aggregated all the time, while adults were mostly aggregated during summer, the main mating period, while the intensity of aggregations was influenced by weather conditions.
Journal ArticleDOI
Spatial relationship and gene flow paths between populations of the alpine snail Arianta arbustorum (Pulmonata: Helicidae).
TL;DR: The alpine snail Arianta arbustorum was sampled along an 8‐km contour line in the Swiss Alps orthogonal to well‐known altitudinal clines in life history and shell traits and two hypotheses about the recolonization of the mountain slopes after the last glaciation were tested.
Journal ArticleDOI
Population size and morph frequency in a long-term study of Cepaea nemoralis
TL;DR: If the largest selection pressure affecting morph frequency arises from visual predation, then the lack of predators, and lack of evidence of change in survival rate are consistent with the invariant morph frequencies, and the extent to which studies of the present kind can detect selection is discussed.
References
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Book
Statistical Tables for Biological, Agricultural and Medical Research
R. A. Fisher,Frank Yates +1 more
TL;DR: Sir Ronald A. Fisher and Frank Yates: Statistical Tables for Biological, Agricultural and Medical Research.
Journal ArticleDOI
Compensation for temperature in the metabolism and activity of poikilotherms
TL;DR: Many poikilothermal animals exhibit in their metabolism or activity some degree of independence of their temperature, but in the general case this is regarded as reflecting a compensation rather than a fundamental insensitivity of metabolism or the rate functions measured.
Journal ArticleDOI
The Control of Humidity by Saturated Salt Solutions
TL;DR: A table of data gives percentage relative humidity over saturated solutions of eighty-eight different salts or salt mixtures as mentioned in this paper, and the suitability of these solutions for humidity control are included.
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