Contribution
Temperature stratification in bog ponds
Sternberg, Klaus
Archiv für Hydrobiologie Volume 129 Number 3 (1994), p. 373 - 382
15 références bibliographiques
publié: Jan 25, 1994
DOI: 10.1127/archiv-hydrobiol/129/1994/373
ArtNo. ESP141012903007, Prix: 29.00 €
Abstract
Although temperature of the bog ground and the upper layers of bog ponds rises to values of respectable heights for some hours during a sunny day the Sphagnum bogs were generally seen as cold environments. This could be stated in the terrestrial areas and was supposed from the aquatic environments also. In the latter the low temperature during night and the rapid and uniform decline of temperature from the upper to the lower water layers during fine days were assumed to be the reasons for the general cold microclimate. But investigations of the embryonal and larval development of bog dwelling dragonflies demonstrated the thermophilic character and the very different thermal demands of some of these species, especially in the first stages. This leads to the assumption that the bog ponds - at least in part - must be for some weeks of warm character and that the dragonfly larvae (and possibly other aquatic organisms) must be able to satisfy their high thermal demands even during the cold nights.
Mots-clefs
dragonfly • larvae • Sphagnum • bogs • microclimate • thermophilic