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Possible effects of climate change on ecological functioning of shallow lakes, Lake Loenderveen as a case study

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Schep S. A., Ter Heerdt G. N. J., Janse J. H., Ouboter M.

Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

2007

nr 38

95-104

The European Water Framework Directive (WFD) requires all inland and coastal waters to reach “good ecological status” by 2015. The good ecological status of shallow lakes can be characterised by clear water dominated by submerged vegetation. The ecological response of shallow lakes on nutrients largely depends on morphological and hydrological features, such as water depth, retention time, water level fl uctuations, bottom type, fetch etc. These features determine the “critical nutrient load” of a lake. When the actual nutrient load of a lake is higher than the critical nutrient load, the ecological quality of this lake will deteriorate, resulting in a turbid state dominated by algae. Climate change might lead to changes in both environmental factors and ecosystem response. This certainly will have an effect on the ecological status. As an illustration the results of a multidiscipline study of a shallow peaty lake (Loenderveen) are presented, including hydrology, geochemistry and ecology. Ground- and surface water fl ows, nutrient dynamics and ecosystem functioning have been studied culminating in an application of the ecological model of the lake (PCLake). Future scenarios were implemented through changing precipitation, evaporation and temperature. Climate change will lead to higher nutrient loads and lower critical nutrient loads. As a consequence lakes shift easier from clear water to a turbid state.

RNA/DNA ratio as an indicator of the impact of long-term accumulative contamination for the assessment of river degradation – a pilot study

100%

Mankiewicz-Boczek J., Kaczkowski Z., Godowska M., Zalewski M.

International Journal of Ecohydrology and Hydrobiology

2010

tom 10

nr 2-4

To improve our understanding of the hierarchy of human induced modifications of the natural environment, with particular regard to the controlling strength of the habitat or chemical impacts, it was found to be appropriate to employ indicators at a molecular level. This paper examines the potential use of the analysis of the RNA/DNA ratio for the evaluation of the ecological status of two rivers of Central Poland. The study confirmed that analysis of the RNA/DNA ratio has the potential to be a sensitive indicator of river degradation. It is also a useful screening method for the evaluation of the impact of prolonged sub-lethal contamination of freshwater ecosystems dominated by tolerant fish species such as the perch, Perca fluviatilis L.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Land Reclamation

1 International Journal of Ecohydrology and Hydrobiology

1 Godowska M.

1 Janse J. H.

1 Kaczkowski Z.

1 Mankiewicz-Boczek J.

1 Ouboter M.

1 Schep S. A.

1 Ter Heerdt G. N. J.

1 Zalewski M.

1 2010

1 2007

Wyniki wyszukiwania

Possible effects of climate change on ecological functioning of shallow lakes, Lake Loenderveen as a case study

RNA/DNA ratio as an indicator of the impact of long-term accumulative contamination for the assessment of river degradation – a pilot study