| ALYURUK Hakan,KONTAS Aynur. 2018. Seasonal variations and distributions of dissolved free and total carbohydrates at the İzmir Bay, Aegean Sea. Acta Oceanologica Sinica, 37(8):6－14 |
| Seasonal variations and distributions of dissolved free and total carbohydrates at the İzmir Bay, Aegean Sea |
| Seasonal variations and distributions of dissolved free and total carbohydrates at the İzmir Bay, Aegean Sea |
| Received:November 30, 2017 Revised:February 24, 2018 |
| DOI：10.1007/s13131-018-1229-x |
| Key words:monosaccharides polysaccharides carbohydrates DOC Chl a İzmir Bay |
| 中文关键词: monosaccharides polysaccharides carbohydrates DOC Chl a İzmir Bay |
| 基金项目: |
| Author Name | Affiliation | E-mail | | ALYURUK Hakan | Graduate School of Natural and Applied Sciences, Dokuz Eylü
l University, Tinaztepe Campus, İ
zmir 35390, Turkey
Institute of Marine Sciences and Technology, Dokuz Eylü
l University, İ
nciraltı
, İ
zmir 35340, Turkey | | | KONTAS Aynur | Institute of Marine Sciences and Technology, Dokuz Eylü
l University, İ
nciraltı
, İ
zmir 35340, Turkey | aynur.kontas@deu.edu.tr |
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| Abstract: |
| Seasonal variations and distributions of dissolved carbohydrate concentrations at the İzmir 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 İzmir Bay might be influenced by biological processes and terrestrial/anthropogenic inputs. |
| 中文摘要: |
| Seasonal variations and distributions of dissolved carbohydrate concentrations at the İzmir 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 İzmir Bay might be influenced by biological processes and terrestrial/anthropogenic inputs. |
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