Comparing long term sediment records to current biological quality element data – Implications for bioassessment and management of a eutrophic lake

摘要: Defining reference conditions for lakes situated in areas of human settlement and agriculture is rarely straightforward, especially difficult within easily eroding nutrient rich watersheds. We used diatoms, cyanobaterial akinetes, remains green algae chironomid head capsules from sediment samples Lake Kirmanjarvi, Finland, to assess its deviation the initial ecological status. These site-specific records change were compared current type-specific status assessment. All paleolimnological data indicated natural mirrored current, monitoring-based assessment “moderate” lake However, showed that should be re-typified as a naturally eutrophic lake. Sediment well monitoring temporary improvement water quality response extensive fish manipulation. Our results suggest can derive restoration efforts result gradual, observable improvements