Factors controlling pelagic production and respiration in a shallow polymictic lake

• Autorzy: Wielgat-Rychter M. , Rychter K. , Ficek D.
• Języki publikacji: EN

Abstrakty

EN

Shallow lakes, defined as 'nonstratifying', polymictic water bodies are usually eutrophic and highly productive, and more turbid than deeper lakes due to bottom sediment resuspension. Gross primary production (GPP) and total planktonic community respiration (TCR) were measured in a very shallow (on average 1.2 m deep) and large (area 25 km2), polymictic, eutrophic Lake Gardno (Baltic coastal lake, Northern Poland) with the light-and-dark bottle method. The aim was to compare GPP to TCR ratio in the pelagic zone in a course of a year and identify factors governing these processes. Identified factors governing GPP were light conditions and temperature, with Q[10] = 2.23 in the 2-24.5[degrees]C temperature range, whereas TCR was driven by water temperature (Q[10] = 2.15 in the same temperature range) and by organic matter content in water. TCR was correlated with total suspended matter (effect of bottom sediment resuspension due to wind action in a very shallow lake), however not with chlorophyll content. During two-year measurement period (years 2006 and 2007), annual GPP amounted to 402 and 471 g C m[^-2], and TCR amounted to 192 and 223 g C m[^-2] respectively. Lake Gardno pelagic system seemed to be net autotrophic on annual basis; GPP to TCR ratio = 2.1. Part of the organic matter produced in pelagial is probably deposited in bottom sediments decomposed there. Wind induced resuspension increases matter content in water (measured here as TSM content) and thus contributes to pelagic respiration processes (TCR).

Słowa kluczowe

EN

Lake Gardno; primary production; respiration; shallow lake

PL

jezioro Gardno; oddychanie; płytkie jezioro; produkcja pierwotna

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2010
• Tom: Vol. 58, nr 2
• Strony: 379--385
• Opis fizyczny: Bibliogr. 12 poz.,

Twórcy

autor

Wielgat-Rychter M.

autor

Rychter K.

autor

Ficek D.

• Institute of Biology and Environmental Protection, Pomeranian University in Słupsk, ul. Arciszewskiego 22b, 76-200 Słupsk, Poland,

Bibliografia

• 1. Balicki H. 1981 – Hydrologia jeziora Gardno [Hydrology of Lake Gardno] – Wiad. IMGW, 7: 91–98.
• 2. Cyberski J., Jędrasik J. 2003 – Wymiana i cyrkulacja wód w jeziorze Gardno [Water exchange and water circulation in Lake Gardno] (In: Jezioro Gardno [Lake Gardno], Ed: Z. Mudryk) – Pomorska Akademia Pedagogiczna, Słupsk, pp. 35–52.
• 3. Ficek D., Wielgat-Rychert M. 2009 – Spatial distribution and seasonal variation in chlorophyll concentrations in the coastal Lake Gardno (Poland) – Oceanol. Hydrobiol. Stud. 38: 1–13.
• 4. Jeffrey S.W., Humphrey G.F. 1975 – New spectrophotometric equation for determining chlorophyll a, b, c1 and c2 – Biochem. Physiol. Pfl. 167: 194–204.
• 5. Kraska J. 2003 – Roślinność [Flora] (In: Jezioro Gardno [Lake Gardno], Ed: Z. Mudryk) – Pomorska Akademia Pedagogiczna, Słupsk, pp. 93–98.
• 6. Nixdorf B., Deneke R. 1997 – Why ‘very shallow’ lakes are more successful opposing reduced nutrient loads – Hydrobiologia, 342/343: 269–284.
• 7. Padisak J., Reynolds C.S. 2003 – Shallow lakes: the absolute, the relative, the functional and the pragmatic – Hydrobiologia, 506/509: 1–11.
• 8. Rychert K., Wielgat-Rychert M. 2008 – Preliminary study on benthic respiration in Lake Gardno; dependence between oxygen consumption rates and temperature (In: Anthropogenic and natural transformations of lakes, 2, Eds: E. Bajkiewicz-Grabowska, D. Borowiak) – Wyd. KLUG-PTLim, Gdańsk, pp. 175–177.
• 9. Scheffer M. 2004 – Ecology of shallow lakes – Kluwer Academic Publishers, Dordrecht, Boston, London, 357 pp.
• 10. Trojanowski J. 2003 – Charakterystyka hydrochemiczna [Hydrochemical characteristics of Lake Gardno] (In: Jezioro Gardno [Lake Gardno], Eds: Z. Mudryk) – Pomorska Akademia Pedagogiczna, Słupsk, pp. 53–63.
• 11. Wetzel R. G. 2001 – Limnology – Academic Press, San Diego, New York, Tokyo, 1006 pp.
• 12. Wetzel R. G., Likens G. E. 1991 – Limnological Analyses – Springer-Verlag, New York, 391 pp.