Seasonal variations and distributions of dissolved free and total carbohydrates at the ?zmir Bay, Aegean Sea  

作　　者：ALYURUK Hakan KONTAS Aynur 

机构地区：[1]Graduate School of Natural and Applied Sciences, Dokuz Eylül University [2]Institute of Marine Sciences and Technology, Dokuz Eylül University

出　　处：《Acta Oceanologica Sinica》2018年第8期6-14,共9页海洋学报（英文版）

摘　　要：Seasonal variations and distributions of dissolved carbohydrate concentrations at the ？zmir Bay were investigated with salinity, chlorophyll a（Chl a）, and dissolved organic carbon（DOC） levels to understand their relationships.Samples were collected from surface, subsurface and bottom depths at seven stations. DOC concentrations ranged from 32.2 to 244.2 μmol/L, and in general, DOC levels increased from winter to summer, then slightly decreased in autumn. Monosaccharide（MCHO）, polysaccharide（PCHO） and total dissolved carbohydrate（TDCHO） levels were found between 0.7–8.3, 0.7–19.5, and 2.6–24.6 μmol/L. DOC, MCHO, PCHO and TDCHO levels were found higher in middle-inner bays, under the influence of anthropogenic inputs, compared to outer bay. Seasonal changes of MCHO/DOC, PCHO/DOC and TDCHO/DOC ratios were statistically significant（p〈0.05）and the ratios showed decrease trends from winter to summer-autumn seasons. Distributions of TDCHO/DOC ratios at wide ranges（2.5%–42.3%） indicated the presence of newly forming and degrading fractions of DOM.According to results of factor analysis, Chl a, MCHO and TDCHO were explained in the same factor groups. In conclusion, the results showed that dissolved carbohydrate levels in the ？zmir Bay might be influenced by biological processes and terrestrial/anthropogenic inputs.Seasonal variations and distributions of dissolved carbohydrate concentrations at the ？zmir Bay were investigated with salinity, chlorophyll a（Chl a）, and dissolved organic carbon（DOC） levels to understand their relationships.Samples were collected from surface, subsurface and bottom depths at seven stations. DOC concentrations ranged from 32.2 to 244.2 μmol/L, and in general, DOC levels increased from winter to summer, then slightly decreased in autumn. Monosaccharide（MCHO）, polysaccharide（PCHO） and total dissolved carbohydrate（TDCHO） levels were found between 0.7–8.3, 0.7–19.5, and 2.6–24.6 μmol/L. DOC, MCHO, PCHO and TDCHO levels were found higher in middle-inner bays, under the influence of anthropogenic inputs, compared to outer bay. Seasonal changes of MCHO/DOC, PCHO/DOC and TDCHO/DOC ratios were statistically significant（p〈0.05）and the ratios showed decrease trends from winter to summer-autumn seasons. Distributions of TDCHO/DOC ratios at wide ranges（2.5%–42.3%） indicated the presence of newly forming and degrading fractions of DOM.According to results of factor analysis, Chl a, MCHO and TDCHO were explained in the same factor groups. In conclusion, the results showed that dissolved carbohydrate levels in the ？zmir Bay might be influenced by biological processes and terrestrial/anthropogenic inputs.

关 键 词：MONOSACCHARIDES POLYSACCHARIDES carbohydrates DOC Chl a imir Bay 

分 类 号：P734[天文地球—海洋化学]