Table 6 Chlorophyll, organic matter, elemental contents and stable isotope composition (average ± standard deviation of three replicates) of bulk sediments of Tekirghiol, Amara and Ursu lakes.
Parameter (fraction of material) | Tekirghiol Lake | Amara Lake | Ursu Lake |
|---|---|---|---|
pH (pore water) | 7.38 ± 0.22 | 8.03 ± 0.24 | 6.55 ± 0.18 |
Total chlorophyll (µg L−1) (in pore water) | 3011.52 | 2348.88 | 5490.86 |
Total carotenoids (µg L−1) (in pore water) | 4072 | 4924 | 3746 |
Total protein (% wet sediment) | 1.80 ± 0.10 | 0.64 ± 0.06 | 1.50 ± 0.09 |
Total organic C (TOC, % dry sediment) | 2.09 ± 0.19 | 3.21 ± 0.28 | 3.24 ± 0.26 |
Total N (% dry sediment) | 0.25 ± 0.02 | 0.35 ± 0.03 | 0.26 ± 0.02 |
Total S (% dry sediment) | 0.87 ± 0.06 | 1.40 ± 0.10 | 0.69 ± 0.06 |
δ13COC (‰ dry sediment) | − 23.87 | − 27.77 | − 27.70 |
δ13CDIC (‰ dry sediment) | − 6.18 | − 2.95 | − 7.38 |
δ18O (‰ sediment carbonates) | − 5.64 | − 2.98 | − 9.68 |
δ15N bulk (‰ dry sediment) | 12.38 | 5.13 | 4.98 |
δ34S bulk (‰ dry sediment) | − 2.26 | − 20.17 | 0.11 |
δ34S sulfides (‰ pore water) | 7.74 | 8.55 | − 5.21 |
δ34S sulfates (‰ pore water) | 37.23 | 18.17 | 28.42 |
Total C/N (% w/w) (from combusted sediments) | 8.49 ± 0.67 | 7.35 ± 0.62 | 5.61 ± 0.50 |
