By George P. Stamou

G.P. Stamou describes the adaptive suggestions that permit arthropods to deal with the severity of Mediterranean environments. After an creation to the constitution and serve as of Mediterranean-type ecosystems, ecophysiological diversifications to water pressure and ranging temperature are thought of. additional, job styles and lifestyles cycle strategies are mentioned on the subject of the peculiarity of Mediterranean environments. Phenological styles and inhabitants dynamics in addition to group buildings also are offered. the amount ends with a synthesis of existence historical past tactics.

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At low temperatures survivorship is independent of humidity, while at temperatures beyond 12°C arthropod survival depends upon the humidity level. In general, different phenomena affecting animal survival, such as cuticular transpiration, are insignificant below certain critical temperatures (Cloudsley-Thompson 1975). The survival and feeding activity of arthropods commonly takes place above a humidity threshold between 65 and 85% relative humidity. It seems that, like their temperate relatives, the short-term response of the Mediterranean animals to air humidity is of the all-or-none type.

Therefore, to explain aspects of life cycle development in relation to short-term oscillating temperatures the discussion will be based primarily on data presented in three papers by Argyropoulou and Stamou (1993), Stamou and Iatrou (1993), and Stamou et al. (1995) Respiratory Metabolism 30 Fig. 301. Metabolic rate (MR) plotted against live weight (double Ln scale) of the diplopod Glomeris balcanica at six different temperatures. 5 ? 0 ~ 0 .... : '":::e.. 8 o Fig. 302. Respiration rate (RR) plotted against live weight (W double log scale) of the collembolan Onychiurus meridiatus at six different temperatures.

85 < 10%R o 10 20 30 40 50 60 70 80 Time (h) Fig. 5. Percentage of water loss in female Archispirostreptus syriacus at three different relative air humidities (RH). Numbers indicate the numbers of test specimens. (Crawford et al. 1986) sonally varying patterns in the permeability of the cuticle of the diplopod Ommatoiulus moreletii. More specifically, he suggested that the new spring and summer cuticles formed after moulting (which occurs in spring) were probably less permeable than the autumnal ones.

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