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Pardosa amentata adopts a “sit-and-wait” predation strategy with periodic changes of site. The metabolic costs of this strategy were evaluated using a Gilson respirometer. The respirometer was run at the mean temperatures prevailing month by month in the litter layer from which the...
Various resistances through the soil-plant-atmosphere continuum were measured in order to find which resistance is mainly responsible for the low leaf water potential reported in coffee plants, especially when water supply is plentiful. Roots appeared to offer a major resistance in this pathway....
The energy costs of the predation strategy of the web-spinning spider Lypthyphantes zimmermanni were investigated in the laboratory. The standard respiratory costs associated with the stationary aspect of the strategy were estimated by means of a Gilson respirometer run at the different...
Two plant communities, both dominated by Carex sempervirens but growing at different altitudes of the Northern Calcareous Alp region ( IS : 600 m; KS : 1200 m) and one Carex ferruginea — dominated community ( KC : 1200 m) are compared as to changes in dry matter, nitrogen, phosphorus, and...
The dynamics of the vegetation were studied in the transition zone from the savannah to the Sahel in order to distinguish between the influence of the recent drought and the influence of overgrazing on the natural rangelands. The drought affected especially the different plant species at the...
The gas exchange and water relations of two Sonoran Desert plants was measured throughout a 12-month period. Seasonal photosynthesis patterns of both plants followed the seasonal variation in plant water potential. Ambrosia deltoidea , a drought-deciduous shrub, is mainly winter-spring active...
The acoustic behaviour of 15 sympatric and synchronically breeding species of frogs in an area of floating meadows near Manaus (Brazil) was studied for a period of 8 months. The calling positions of each species can be identified with certain physiognomic types of vegetation. Sound analyses were...
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