![]() In the 1940s only diatoms were reported, but since the 1990s other phytoplankton groups and taxa have become relevant. Nutrients were not limiting in the lake with an overall mean concentration of soluble reactive phosphorus of 22 μg L −1 and total phosphorus of 58 μg L −1 and of dissolved inorganic nitrogen of 305 μg L −1, with ammonium being the primary form. ![]() However, the epilimnion may be decoupled from the hypolimnion by a seasonal chemocline. Our results revealed that diatoms and chlorophytes dominated during most of the study period in Lake Hayq and seem to be favored by the mixing regime of the water body, which can be described as partial atelomixis with daily mixing of the epilimnion maintaining the algae within the euphotic depth via regular re-suspension. Net and integrated water samples were used for determination of physico-chemical parameters and phytoplankton biovolumes. The present study addresses the potential reasons for the diatom dominance as well as causes of the trophic change. The trophic status of Lake Hayq was reported to have changed from oligotrophic to eutrophic in 1992. ![]() Earlier sporadic surveys indicated that the phytoplankton community was predominantly characterized by heavy diatoms, which characteristically suffer from rapid sedimentation. We studied the temporal phytoplankton community pattern of the deep crater Lake Hayq in the highlands of Ethiopia from October 2007 to October 2008. ![]()
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