Long-term Changes and Controlling Factors of Phytoplankton Community in the Gulf of Riga (Baltic Sea) |
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Authors: | Iveta Jurgensone Jacob Carstensen Anda Ikauniece Baiba Kalveka |
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Institution: | (1) Latvian Institute of Aquatic Ecology, Marine Monitoring Centre, Daugavgrivas 8, LV-1048 Riga, Latvia;(2) Department of Marine Ecology, National Environmental Research Institute, Aarhus University, Frederiksborgvej 399, DK-4000 Roskilde, Denmark |
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Abstract: | Trends in phytoplankton monitoring data (1976–2008) from the Gulf of Riga were investigated and linked to environmental factors.
Annual means of spring phytoplankton biomass correlated to phosphorus input from land and shifts between diatoms and dinoflagellates
were attributed to potential Si limitation and time of sampling relative to the spring phytoplankton succession. The summer
phytoplankton biomass, which more than doubled over the study period, was related to the abundance of summer copepods that
similarly declined. Cyanobacterial blooms proliferated in summer and the proportion of diatoms similarly declined when the
winter–spring inorganic N/P ratio was low. The chlorophyte proportion in summer increased over the study period, and this
was linked to increasing temperatures favoring their higher growth rates. The dinoflagellate proportion appeared to decrease
with temperatures above a threshold of 15.5°C. Although nutrient inputs and their ratios are important factors for the phytoplankton
community, this study suggests that climate change and overfishing could be equally important. |
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