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1

Effect of microhabitat ariability on body size in Drosophila subobscura

100%
Stamenkovic-Radak M., Rasic G., Cuckovic M., Savic T., Andjelkovic M.
Folia Biologica
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2008
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vol. 56
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issue 1-2
51-56
EN
We assessed the variation in thorax size, wing size and wing loading in populations of Drosophila subobscura from two ecologically different habitats and within each habitat sampled during three periods of the day. The traits analyzed differed between laboratory reared samples and field collected samples. Differences were mainly caused by environmental factors and genotype x environmental interactions. While there were no significant differences between populations for particular periods of the day, within-population analysis for each sex showed specific differences. Results showed that wing loading was the least variable character in natural populations, also showing the lowest level of sexual dimorphism. The data are discussed from the aspect of the variability of gene arrangement frequencies over daytime periods obtained previously for the same samples. They are consistent with models of maintenance of genetic variability in multi-niche habitats, and are in favour of a type of reactive behaviour dependent on ecological niche qualities on a daily rhythm scale in D. subobscura.
2

Circadian activity rhythm in sheep and goats housed in stable conditions

100%
Piccione P., Giannetto C., Casella S., Caola G.
Folia Biologica
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2008
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vol. 56
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issue 3-4
133-137
EN
The aim of this study was to establish the circadian rhythm of total activity in sheep and goats ept in housed conditions. For our study five Comisana breed sheep and five Maltese breed goats were kept in an individual box of 12 m2 under artificial 12/12 light/dark cycle for 14 days. We equipped the animals with Actiwatch-Mini, by means of collars. A two-way ANOVA was used to determine significant differences between experimental treatments. A paired Student t-test was used to evaluate the differences between photophase and scotophase. The results show that activity in sheep and goats is mainly diurnal, the activity rhythm reaches its peak in the middle of the day. In conclusion small ruminants c classified as diurnal animals, even though they show a variable amounts of activity.
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