Malmö University Publications
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  • 1.
    Ekelund, Nils
    Malmö högskola, Faculty of Education and Society (LS), Department of Nature, Environment and Society (NMS).
    Hur påverkar klimatförändringar sjöar och hav? = The potential effects of global climate change on oceans and lakes2012In: Vatten, ISSN 0042-2886, Vol. 68, p. 155-160Article in journal (Other academic)
    Abstract [en]

    Global increases in atmospheric CO2 and temperature are associated with an increase in the temperature of freshwater lakes and marine ecosystems. The ice breakup in lakes occur earlier which gives an opportunity for phytoplankton to grow early in the season. Another effect is a prolonged period of stratification in the lakes. Warming also may cause a shift of species in phytoplankton community. Climate models indicate that bluegreen algae will increase in relative abundance under the predicted future climate. The effects of climate change on marine ecosystems are related to shifts in water temperature, circulation, stratification, nutrient input and pH. An increase in temperature will create a rising sea level, decreasing sea-ice extent in Antarctica and Arctic and a altered patterns of ocean circulation and freshwater input. A greater light penetration into the water column caused by a reduction in sea ice may increase open-water phytoplankton primary production, although nutrient limitation could reduce the level of increase in primary production. In tropical waters are coral reefs very vulnerable to minor increases in temperature. A rising atmospheric CO2 and a resulting increased oceanic CO2 uptake will also reduce the sea-surface pH. A drop in pH makes it more difficult for corals to secrete and maintain their skeletons.

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  • 2.
    Ekelund, Nils
    et al.
    Mid Sweden University, Department of Natural Sciences.
    Aronsson, Andreas
    Mid Sweden University, Department of Natural Sciences.
    Flagellaten Euglena gracilis rörelseförmåga kan avslöja graden av giftighet (kadmium) i vatten med hjälp av metoden ECOTOX. (Orientation of the flagellate Euglena gracilis can identify the toxicity (cadmium) of water using the automatic biotest ECOTOX)2004In: Vatten, ISSN 0042-2886, Vol. 60, p. 77-83Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    The interest in testing of water and wastewater for toxic compounds has increased in the last few years with rising pollutant levels from industry and with rising sensibility towards environmental problems. In order to get an early warning signal of environmental conditions the use of unicellular organism are recommended since they respond quickly and are easy to handle. An early warning system, called ECOTOX, for monitoring of water quality has been developed by a research group in Germany (Prof. D.-P. Häder). ECOTOX use movement parameters of the flagellate Euglena gracilis as orientation in the gravity field, the motility and the velocity of the cells. These parameters have been found to be sensitive to toxic compounds. In the present study it was shown that cadmium affect gravitaxis, motility, velocity and compactness of the cells negatively in the concentration interval of 10 to 15 mg l-1 after 24 and 48 h. After short time of incubation (minutes) with cadmium there is an inhibition of the different movements parameters starting at the concentration of 25 mg l-1. Like other biomonitoring systems ECOTOX can be used to detect changes in quality of aquatic systems.

  • 3.
    Ekelund, Nils
    et al.
    Malmö University, Faculty of Education and Society (LS), Department of Natural Science, Mathematics and Society (NMS).
    Sandström, Jennie
    Årstidsvariationer i sjöar vid klimatförändringar / Seasonal Variations in Lakes in Northern Sweden in a Changing Climate2019In: Vatten, ISSN 0042-2886, Vol. 74, no 4, p. 181-188Article in journal (Other academic)
    Abstract [en]

    Lakes are suitable sentinels of climate change because they constitute a well defined ecosystem and they respond quickly to changes in climate. Many lakes in the northern hemisphere are covered by ice during winter and they are dimictic, which means that the water circulate two times each year. The ice not only prevents gas exchanges or wind mixing, the ice, together with snow, are also a large obstacles that shortens the growing period for all the producers in the lake by reducing light penetration. Spring bloom of phytoplankton along with onset of stratification might occur earlier in the season if the ice breaks up earlier. Climate warming will lead to higher temperatures and it will alter the mixing conditions as well as affect thermal stratification in lakes. All the lakes included in this study are situated in the southern parts of the region Norrland in Sweden. The average ice break-up between 2001 – 2010 occurs about 12 days earlier compared to the average ice break-up for the period 1916 – 1925 and 11 days earlier compared to 1976 – 1985. The mean annual air temperature in Junsele shows a trend in which the air temperature is getting warmer with time. Higher air temperature shows a correlation with changes in ice phenology, where the lakes experience a shortened ice cover duration. Key Words – climate change, lakes, phenology, temperature, thermal stratification, warming

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