| Abstract | Kongsfjorden (Spitsbergen, Svalbard) is an inlet treated as a model site for studies on the impact of climate change in the Arctic due to its hydrological features. In this research, seven-days monitoring was carried out to evaluate the effects of hydrological variability on phytoplankton biomass and diversity in the late summer period. Temperature, salinity, nutrients, total suspended matter, phytoplankton abundance and biomass were determined for each sample. The thermo-haline properties of the column water seemed to affect phytoplankton communities. Their abundances and biomass were correlated with the amount of the total suspended matter. Moreover, species composition and biomass dramatically changed throughout the study period. Cold-water and Atlantic species were replaced by temperatewarm water dinoflagellates, including harmful species. An increase in phytoplankton biomass as well as the presence of dinoflagellate aggregations, mainly composed of Prorocentrum cf. gracile, were detected. This kind of algal accumulation is a new phenomenon in the Arctic and was probably related to the mobilization of sediment-rich glacial meltwaters. These findings, even if preliminary, suggest the need to study how additional biomass pulses and the increase of harmful species may alter the food web structure and the biogeochemical cycles, leading to major ecosystem changes. |
| Text | 369197 2017 10.7872/crya/v38.iss1.2017.53 Scopus 2 s2.0 85016255932 ISI Web of Science WOS WOS 000398843000005 bloom climate change harmful algae phytoplankton Arctic fjord Late Summer Phytoplankton Blooms in the Changing Polar Environment of the Kongsfjorden Svalbard, Arctic Caroppo C.; Pagliara P.; Azzaro F.; Miserocchi S.; Azzaro M. National Research Council, Institute for Coastal Marine Environment, Via Roma, 3, Taranto, 74123, , Italy; Disteba, University of Salento, Via Provinciale Lecce Monteroni, Lecce, 73100, , Italy; National Research Council, Institute for Coastal Marine Environment, Spianata S. Raineri, 86, Messina, 98122, , Italy; National Research Council, Institute of Marine Sciences, Via Gobetti, 101, Bologna, 40129, , Italy Kongsfjorden Spitsbergen, Svalbard is an inlet treated as a model site for studies on the impact of climate change in the Arctic due to its hydrological features. In this research, seven days monitoring was carried out to evaluate the effects of hydrological variability on phytoplankton biomass and diversity in the late summer period. Temperature, salinity, nutrients, total suspended matter, phytoplankton abundance and biomass were determined for each sample. The thermo haline properties of the column water seemed to affect phytoplankton communities. Their abundances and biomass were correlated with the amount of the total suspended matter. Moreover, species composition and biomass dramatically changed throughout the study period. Cold water and Atlantic species were replaced by temperatewarm water dinoflagellates, including harmful species. An increase in phytoplankton biomass as well as the presence of dinoflagellate aggregations, mainly composed of Prorocentrum cf. gracile, were detected. This kind of algal accumulation is a new phenomenon in the Arctic and was probably related to the mobilization of sediment rich glacial meltwaters. These findings, even if preliminary, suggest the need to study how additional biomass pulses and the increase of harmful species may alter the food web structure and the biogeochemical cycles, leading to major ecosystem changes. 38 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85016255932 origin=inward Caroppo et al 2017_def pdf articolo Caroppo et al. 2017_def.pdf Articolo in rivista ADAC 0181 1568 Cryptogamie. Algologie Cryptogamie. Algologie Cryptogam., Algol. Cryptogamie. stefano.miserocchi MISEROCCHI STEFANO filippo.azzaro AZZARO FILIPPO carmela.caroppo CAROPPO CARMELA maurizio.azzaro AZZARO MAURIZIO TA.P02.016.003 Processi biogeochimici, flussi bentici e cambiamenti climatici |
