NATURAL AND HUMAN INDUCED NUTRIENT IMPACTS ON PHYTOPLANKTON COMMUNITIES IN MERSIN BAY, NE MEDITERRANEAN

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2017-11-01

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Boran, Leona Julia

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Monthly sampling (January 2014 to December 2015) of 8 Erdemli Times Series stations showed that heterotrophic bacteria and cyanobacteria dominate coastal and off-shore plankton communities and decrease with depth and distance to the coast. Cell-volume of Synechococcus was positively correlated with temperature and N:P-ratios while cell volume of heterotrophic bacteria cell was negatively correlated with temperature. Negative and positive significant correlations between species abundances and N:P-ratios, and the shifts from one to the other during the two years indicate that limitations are species-specific and switch among P-limitation, N-limitation and co-limitation. The often occurring positive significant correlations between cyanobacteria and N:P-ratios show their high need of nitrogen. Micro-phytoplankton species are higher abundant in the coastal ETS-20 station than the ETS-100 and ETS-200 stations which showed high Bray-Curtis-Similarities to each other and low similarities with the ETS-20 station. Nutrients carried by the Lamas River increased in nitrogen concentrations, and thus have higher in N:P-ratios and lower in Si:N-ratios than in the previous measurements conducted in 2003 and 2007. The effect of the seasonal river water addition to coastal and off-shore communities revealed that seasonality matters and especially nano- and micro-phytoplankton species are affected and effects are shown in an increase of chlorophyll-a. River water and sediment addition led to an increase in chlorophyll, triggered by an increase in diatom abundances. Chlorophyll in off-shore communities increased slightly less. Human induced nutrient addition led to a stronger effect on phytoplankton communities and altered the communities more severely.

Subject Keywords

Phytoplankton abundance, picoplankton biomass, limiting nutrients, dredged material dumping, Northern Levantine Basin

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https://hdl.handle.net/11511/95088

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Graduate School of Marine Sciences, Thesis

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Citation Formats

L. J. Boran, “NATURAL AND HUMAN INDUCED NUTRIENT IMPACTS ON PHYTOPLANKTON COMMUNITIES IN MERSIN BAY, NE MEDITERRANEAN,” Ph.D. - Doctoral Program, Middle East Technical University, 2017.