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Öğe Annual Variation in the Diversity, Species Richness and Composition of the Phytoplankton Assemblages in the Izmir Bay (Eastern Aegean)(Central Fisheries Research Inst, 2011) Sabanci, Fatma Colak; Koray, TufanIn this study, qualitative and quantitative characteristics of phytoplankton community structure and environmental factors which have influences on its distribution and the changes in Izmir Bay (Aegean Sea) were investigated. The water samples were collected seasonally between January 1998 and December 2001 from 3 sampling sites (from surface, -5 m, -10 in and -15 m). During the study period, a total of 115 taxa from three algal classes, Cyanophyceae, Dinophyceae and Bacillariophyceae were determined. Spatio-temporal phytoplankton community composition in the bay was often dominated by dinoflagellates but shift to diatom dominance was observed in some periods, particularly in spring and winter. The Wastewater Treatment Plant (WTP) began to treat domestic and industrial wastes since early 2000. The sampling periods of the study include both before and after the activation of treatment plant. Although WTP is sufficient for removal of nitrogen from the wastes, it is inadequate for removal of phosphate. This is also compatible with the decreasing N/P ratios observed during 2000-2001 in the middle and inner bays. Therefore, the decrease in the ratios caused by treatment plant, affects the species diversity of both dinoflagellat and diatom assemblages. The student's t-tests and the discriminant analyses outcome from different stations and years demonstrate statistically significant variances at a P <= 0.05 probability level. These results indicated that the considerable improvements should be expected in the next years.Öğe Phytoplankton Distribution and its Relationship to the Physico-Chemical Environment in a Coastal Lagoon(Foundation Environmental Protection & Research-Fepr, 2014) Sabanci, Fatma ColakThe spatio-temporal variation of the phytoplankton community structure and the environmental factors that affect its distribution and the changes in Homa Lagoon were examined. Sampling took place monthly at four stations between December 2006 and December 2007. During the study period, a total of 58 taxa of which 52 were used as active taxa in the numerical analysis (relative abundance > 1%) were from four algal classes, Cyanophyceae, Dinophyceae, Bacillariophyceae, and Euglenophyceae. In general, the most important groups were diatoms and dinoflagellates in terms of species numbers and abundance. The mean Shannon-Weaver's diversity index (H') and Pielou evenness index (J') values were 2.35 and 0.83, respectively. An abundance of the bloom of certain phytoplankton species, especially Cylindrotheca closterium and Navicula sp., was thought to be the cause of the low diversity index and evenness values. Although nitrogen was thought to be limiting in temperate regions, phosphorus was a limiting factor on the phytoplankton growth in the Homa Lagoon because of the correlation between the abundance and NIP ratio. The relationship between the phytoplankton communities and 10 environmental variables were researched using a canonical correspondence analysis (CCA). According to the Monte Carlo unrestricted permutation test, the temperature and nitrate concentration were the most important variables in accounting for species distribution.Öğe A QUALITATIVE STUDY OF THE MICROPHYTOBENTHIC COMMUNITIES OF HOMA LAGOON (IZMIR-TURKEY)(Parlar Scientific Publications (P S P), 2011) Sabanci, Fatma Colak; Sapanci, Mert; Koray, Tufan; Buyukisik, BahaThe taxonomical composition of epipelic diatoms was investigated at four stations in Homa Lagoon during June 2006 and September 2007. A total of 54 diatom taxa were determined and dominated by pennate diatoms. Cocconeis scutellum, Eunotogramma marinum, Mastogloia lanceoalata, Navicula abrupta, N. cincta, N. cryptocephala var. veneta, N. cryptotenella, Nitzschia apiculata, Psammodictyon panduriforme, Rhabdonema adriaticum and Stauroneis amphioxys were found at all stations. The collected seasonal samples at each station constituted seven seperate groups in the MDS plot, which were correlated with a combination of environmental variables such as temperature, the concentrations of nitrite and percentage of total organic carbon in the sediment (rho r=0.15).Öğe Relationship of epilithic diatom communities to environmental variables in Homa lagoon (Izmir, Turkey)(Inter-Research, 2011) Sabanci, Fatma ColakSpatio-temporal changes in taxonomic composition and structure of a diatom community were assessed between June 2006 and June 2007 at the intertidal zone of Homa lagoon, Izmir, Turkey. The communities were composed of a mixture of epilithic, epiphytic, epipsammic, and occasionally some pelagic diatoms. In total, 87 taxa belonging to 39 genera were identified, of which 39 were used as active taxa in the numerical analysis. The Shannon-Wiener diversity index (H') values were quite variable, varying between 1.00 and 3.39 and correlated with both species richness (r = 0.93) and evenness (J'; r = 0.38). Cylindrotheca closterium, Halamphora veneta, Licmophora gracilis, L. lyngbyei, Navicula cryptocephala, N. cincta, and N. ramosissima var. mollis were the overall most abundant taxa throughout the sampling. The relationship between epilithic algal communities and 10 environmental variables was explored using canonical correspondence analysis. According to a Monte Carlo unrestricted permutation test, the silicate and ammonium concentrations were the most important variables in accounting for species distribution.Öğe Taxonomic Survey of Benthic Diatoms on Natural Substrata From Coastal Lagoon (Aegean Sea, Turkey)(Central Fisheries Research Inst, 2012) Sabanci, Fatma ColakThe taxonomical composition of epilithic diatoms was investigated at intertidal zone of Homa lagoon, Aegean sea, Turkey. The stations are located in different littoral zones of the study area and they are different from each other in terms of hydrological respect. The samples contained a mixture of forms growing on the stones themselves, on silt accumulated on the stones and forms epiphytic on other algae, I will refer to this collective community as epilithon. Epilithic diatom species, which constitute the majority of the community were examined from obtained material. A total of 67 diatom taxa belonging to 34 genera were identified to the genus or species level. The species more frequently found in the samples were Cocconeis placentula, Cocconeis scutellum, Mastogloia pumila, Navicula cincta and Navicula crypyocephala var. veneta. Nine of the species identified during the research period seem to be previously unreported for Turkish coastal waters. Morphological characteristics of these species were given in detail information and original photographs.
