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Air-Water Interface in an Estuarine Lake : Chlorophyll and Nutrient Enrichment

Antonowicz J. P.

Polish Journal of Ecology

2018

Vol. 66, nr 3

205--216

The surface water microlayer (SML) is a thin layer found at the interface of the hydrosphere and the atmosphere. It is capable of accumulating chemical substances and microorganisms at a rate as high as 100-fold greater than that observed in the subsurface water. The rate of accumulation of biogens and chlorophyll a in SML of an estuary, where marine and fresh waters mix, varies considerably and it depends on the degree mixing of these waters, which is manifested in the varying values of the enrichment factor (EF, calculated as the ratio of nutrients concentration in SML versus subsurface water). The influence of the Baltic Sea marine water and the freshwater Łeba River inflows on the estuarine Lake Łebsko (Poland) was examined. Nine sampling sites were located in the estuary. Water samples were collected from two layers: the surface microlayer (thickness 242 µm ± 40) and the subsurface water (15 cm depth). The capacity of the SML to enrich the water in nutrients and chlorophyll differed among various parts of the estuary, as well as between seawater and river waters. Statistically significant higher EF were found in the marine waters than in river waters for the nitrogen and phosphorus compounds as well as chlorophyll. There were also differences in EF between marine and lake waters. The highest EF were also recorded for organic forms of nitrogen and phosphorus in marine water. Most probably, marine flux into the estuarine Lake Łebsko, resulted in the increased EF for these investigated components.

Dobowe fluktuacje substancji biogenicznych i chlorofilu w ekotonie:hydrosfera - atmosfera jeziora lobeliowego

Antonowicz J. P.

Proceedings of ECOpole

2014

Vol. 8, No. 2

465--470

Wykonano cykl badań dobowych określających dobową dynamikę stężenia wybranych rozpuszczalnych związków biogennych, takich jak: fosfor fosforanowy, azot amonowy i azot azotanowy oraz ilości chlorofilu a. Próbki wody pozyskano z ekotonu mikrowarstwy powierzchniowej oraz z warstwy wody podpowierzchniowej z jeziora lobeliowego. Próbki pobierano w cyklu czterogodzinnym przez okres trzech dni. Na podstawie uzyskanych wyników stwierdzono, że badane parametry zmieniają swoje stężenie w sposób cykliczny. Dynamika stężenia chlorofilu a wskazuje na transport fitoneustonu między mikrowarstwą powierzchniową i niżej położonymi warstwami wody.

A series of studies concerning daily fluctuation cycles of selected soluble nutrients compounds like phosphorus, nitrates and phytoneuston occurrence was performed. The samples were gained from the ecotone surface microlayer and the water depths of a lobelia lake. Water samples were sampled in a four hour cycle for three days. On the basis of the gained data it was stated that the studied parameters changed periodically. The dynamics of amount of chlorophyll a indicate movement of phytoneuston between surface microlayer and the water depths.