(Table 3) Temporal variations in areal nitrogen fixation rate from monthly sampling in 2006-2007 at stations TB200 and TB1000 west of Herzelia

Areal rates were calculated from 15N2 uptake measurements for at least four depths (three replicates per depth) and integrated from surface to 150 m depth. Also presented are isotopic compositions (d15N) of particulate matter averaged from non-spiked samples at the four depths (n= 8 per month).