Inter-decadal Variability in Phytoplankton Community in the Middle Adriatic (Ka?tela Bay) in Relation to the North Atlantic Oscillation |
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| Authors: | ?ivana Nin?evi? Gladan Ivona Marasovi? Branka Grbec Sanda Skeji? Mia Bu?an?i? Grozdan Ku?pili? Slavica Matijevi? Frano Mati? |
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| Institution: | (1) Institute of Oceanography and Fisheries, Šetalište I. Meštrovića 63, 21000 Split, Croatia, P.O. Box 500 |
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| Abstract: | Evaluation of a 45-year data set of primary production (PP), a 30-year data set of phytoplankton biomass, and a 51-year data
set of species composition shows an increase of phytoplankton biomass and abundance in the period from the mid-1980s to the
mid-1990s. Phytoplankton biomass showed bimodal seasonal cycles, with winter and spring maxima, which did not change over
the past 30 years. Diatoms were the most abundant functional group and they prevailed during the colder part of the year while
the dinoflagellate contribution to the phytoplankton community increased in the warmer period from May to August. Diatoms
showed a significant negative correlation with sea surface temperature (SST), while dinoflagellates were positively correlated
with SST. An increase of phytoplankton abundance, particularly dinoflagellate, in the period from the mid-1980s to the mid-1990s
coincided with years characterized by a high North Atlantic Oscillation (NAO) index. Primary production and chlorophyll a concentration in the spring period were negatively correlated with the NAO winter (DJFM) index, probably caused by increased
precipitation associated with a low or negative NAO index. PP in winter during the mixing period was positively related to
the NAO winter index associated with higher temperatures and dry conditions which brought more clear days and increased input
of solar radiation. |
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