Naslov
Variability of CDOM in dependence of lake hydrology and stratification

Autori
Palijan, Goran

Vrsta, podvrsta i kategorija rada
Poglavlja u knjigama, znanstveni

Knjiga
Advances in Environmental Research

Urednik/ci
Daniels, Justin A.

Izdavač
Nova Science Publishers

Grad
New York (NY)

Godina
2019

Raspon stranica
175-190

ISBN
978-1-53614-987-6

Ključne riječi
CDOM, flood, stratification, air temperature, Kopački Rit

Sažetak
The samples were collected during spring flooding conditions in temperate, stratified floodplain lake Sakadaš in the Kopački Rit floodplain of the River Danube. A selection of environmental (Danube water level, lake water depth, transparency, water and air temperature, pH, conductivity, ammonium, nitrites, nitrates, Kjeldahl nitrogen, total phosphorus and total suspended solids concentrations) and biotic variables (total number of bacteria, colony forming units of copiotrophs and oligotrophs and their ratio, and chlorophyll a concentration) were related to absorbance of water filtrates at 250 and 365 nm and to 250/365 absorption ratio. Distance based redundancy analysis was used to visualize the result of distance based linear modelling which offered explanation of 79.1 % of variability in water absorbance properties, 45 % of which was explained solely by air temperature. Gradient in CDOM created by air temperature, i.e. insolation, was independent of hydrology and sampling water layer as it occurred equally between water layers and hydrological phases. It was dominantly the result of changes in absorbance at 365 nm while absorbance at 250 nm did not change considerably. Hence it is possible that insolation caused mineralization of high molecular weight DOM, or its photobleaching rather than photodegradation. These data suggest high importance of insolation for structuring of floodplain ecosystems because it have potential to impact floodplain lakes regardless of flood. Future investigations of floodplain aquatic habitats should take into account insolation effects beside those of hydrology.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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