However, tritium contents show a negative correlation with specific conductivity, consistent with the idea that samples with the greatest amount of recharge by modern freshwater (highest tritium contents) have been the most diluted.
The genes encoding these ABC systems occupy nearly 1.3% of the gene content in freshwater Bdellovibrio strains and about 0.7% in their saltwater counterparts.
Typical Se content in freshwaters is found in the range of 0.1 2 nM (equivalent to 0.08 0.16 μg Se L−1), but much higher concentrations reaching 5 µM (equivalent to 400 µg Se L−1) have been observed in contaminated areas (Conde and Sanz Alaejos 1997; Sun et al. 2014).
The upper and surface waters have low salinity (less than 34.0), except in the Weddell and Ross seas, where sea ice formation removes freshwater, increasing the overall salt content.
Thoss et al. [ 27] have compared 5 different methods to measure phenolic content in various freshwater samples.
Given the intolerance of the N. taihuensis to waters with some salt content, members of freshwater fish division cannot disperse by river connections [ 34].
The large contents of chloride in freshwater is an indicator of pollution (Venkatasubramani and Meenambal 2007).
Nutrient content (nitrate and phosphate) of freshwater runoff were obtained from Ludwig et al. [ 2009].
