Estuarine and coastal ecosystems provide multiple ecological, social and economic services, in particular for the fishing industry. Despite all the efforts done in environmental management, pollution associated with the rapid coastal development and intensive coastal industrialization remains one of the main threats towards marine ecosystems [1,2]. Specifically, chemical pollution induced by trace metals (TM) is of specific concern as coastal areas are generally prone to accumulate them, as it is the case in the Gotland Basin (Baltic Sea). Most TM exhibit a dual role in marine waters, they act as nutrients in low concentrations, but have toxic effects in the higher concentration ranges. Continuous monitoring efforts has led to a better understanding of the fate of TM in the marine environment. However, the toxicity of these trace elements is strongly linked with their biogeochemical speciation, which shows both seasonal and spatial variation. Here, we compare the active TM sampling procedure with passive sampling technique of Diffusive Gradients in Thin-films (DGT) for metal speciation [3]. This dual approach allows to shed light on the relation between TM concentrations and the possible bio-available fraction. The Baltic Sea is an ideal place to study TM behaviour, as the proximity of strong industrial activity has led to high concentrations of TM and as hypoxic environments are formed at the deep waters. For this study, 4 stations were selected in the Gotland Basin and sampled at different depths: 2 stations in the Swedish waters and 2 stations in the Latvian ones. Our results show that: (i) vertical profiles of particulate and dissolved metals in the water column reflect influences of oxygen deficiency and anoxic conditions in bottom water layers (ii) dissolved and particulate concentrations do not correlate well with their bioavailability. These results indicate that, even though the total dissolved concentrations of metals are higher at one station, the labile TM concentrations do not follow the same trends. However, with increasing acidification of the ocean, the higher particulate TM concentrations might lead to increasing adverse effects on the coastal environment. References [1]Phillips D.J.H.1977.Environmental Pollution 13.[2]Rumisha C.,2012.Marine Pollution Bulletin 64.[3]Davison W.& Zhang H.2016.Cambridge University Press.
Original languageEnglish
Number of pages1
Publication statusUnpublished - 19 Sep 2019
EventDGT Conference 2019 - University of Natural Resources and Life Sciences, Vienna, Austria
Duration: 18 Sep 201920 Sep 2019
https://dgt2019.boku.ac.at/

Conference

ConferenceDGT Conference 2019
CountryAustria
CityVienna
Period18/09/1920/09/19
Internet address

ID: 48287922