- 1) Zoological Division, Biological Institute, University of Oslo, P.O. Box 1050, N-0316, Oslo, Norway
Crustacean remains are not yet useful as parameters for assessing the recent acidification phenomenon, due to too few studies on their ecology. The changes observed in the sediments are related not just to changes in lake chemistry, but also to predatory and competitive interactions. Moreover, the habitat pH of the organism may differ from the measured lake pH, and may as such not be representative. Therefore, species in some acidic lakes may decrease their abundance, whereas the same species in nearby acidic lakes increase. The caution mainly concerns species with no clear pH distribution. Species predominant in acidic or alkaline lakes generally follow patterns more closely related to their physiology. Study of pelagic species, including both body size and shape measurements, should be included in the analysis. If all the ecological factors are included, animal as well as algal remains would form powerful tools to reveal lake histories.
- 1 - sciences appliquees, technologies et medecines
- 2 - sciences biologiques et medicales
- 3 - sciences biologiques fondamentales et appliquees. psychologie
- 4 - psychologie. psychophysiologie