期刊
WATER
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/w12092652
关键词
phytoplankton abundance; chlorophylla; nutrient biogeochemistry; runoff; precipitation; coastal zones; climate changes; seasonal cycle; long-term trends
资金
- FriuliVenezia Giulia Region
- European cooperation projects between Italy and Slovenia: INTERREG II (Monitoraggio dell'Alto Adriatico Studio dello stato trofico e delle anomalie del Sistema Alto Adriatico)
- European cooperation projects between Italy and Slovenia: INTERREG IIIA (study of the trophic state and of the anomalies in the Northern Adriatic Sea system) [AAFVG111006]
- European cooperation projects between Italy and Slovenia: INTERREG IIIA (EcoMADR-Integration Analysis of North Adriatic Marine Ecosystem) [CAFVG111551]
- European cooperation projects between Italy and Slovenia: INTERREG IIICBC Phare (OBAS, Biological Oceanography of the Northern Adriatic Sea) [AAVEN111034]
During the last century, human activities have exerted an increasing pressure on coastal ecosystems, primarily inducing their eutrophication, with a more recent partial mitigation of this phenomenon where improvements of environmental management practices were adopted. However, a reanalysis of the pressures on coastal zones and surrounding drainage basins is needed because of the alterations induced nowadays by the climate changes. A comparative analysis of long-term oceanographic and environmental data series (1986-2018) was performed, in order to highlight the effects of anthropogenic and climatic disturbances on the phytoplankton community in the Gulf of Trieste (GoT). After the 1980s, the decline in phytoplankton abundance was matched to increasing periods of low runoff, an overall deficit of the precipitation and to a decrease in phosphate availability in the coastal waters (-0.003 mu mol L(-1)yr(-1)), even in the presence of large riverine inputs of nitrogen and silicates. This trend of oligotrophication was reversed in the 2010s by the beginning of a new and unexpected phase of climatic instability, which also caused changes of the composition and seasonal cycle of the phytoplankton community. Beyond the management of nutrient loads, it was shown that climatic drivers such as seawater warming, precipitation and wind regime affect both nutrient balance and phytoplankton community in this coastal zone.
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