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- W2073643070 abstract "abstract Available online 10 November 2011Keywords:Satellite Chl-aEnvironmental variabilityPagasitikos Gulf Pagasitikos Gulf (Greece), presents an interesting area as it depicts strongly non-linear ecosystem character-istics. It is a shallow coastal area where the marine ecosystem picture is strongly influenced by non-linearhydrodynamic interactions and instabilities. In this study, we explore and assess the major influential vari-ables of the surface phytoplankton biomass (Chlorophyll-a). Several different physical and biogeochemicalparameters were used (sea surface temperature [SST], mixed layer depth [MLD], salinity, phosphates andnitrates) to identify which variables control or significantly affect the surface Chl-a of Pagasitikos Gulf forthe period of 2001–2005. The variables were derived from a coupled hydrodynamic-biogeochemical modeland remotely sensed data from SeaWiFS and AVHRR sensor. Generalised Additive Models (GAMs) wereused to examine the relationships between Chlorophyll-a and the environmental regime. GAM analysisshowed that the combined effects of the variables used, explained 71% of the surface chlorophyll variation.The order of importance of the variables (based on GAM probability) is p=0.01 (for both phosphate andnitrate), MLD: p=0.0197, salinity: p=0.022, and SST: p=0.046. The results clearly indicated the importanceof deep mixing for Pagasitikos Gulf, as the surface phytoplankton blooms appeared to be favoured by cold,nutrient rich, well mixed and higher salinity waters. GAMs indicated that SST plays a significant role havinga strong negative relationship with Chl-a, where the highest concentration is reached at 12–15 °C and min-imum at 22–26 °C. Chl-a ceases to increase after 37.9‰ of salinity and 40 m of MLD, while minimum concen-tration is found at 10 m of MLD, with a subsequent increase as the waters become more mixed. Phosphateand nitrates appeared to be of equal importance with Chl-a exhibiting an increase along with the nutrients.© 2011 Elsevier B.V. All rights reserved." @default.
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- W2073643070 date "2012-06-01" @default.
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- W2073643070 title "Assessing chlorophyll variability in relation to the environmental regime in Pagasitikos Gulf, Greece" @default.
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- W2073643070 doi "https://doi.org/10.1016/j.jmarsys.2011.11.003" @default.
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