Nearly threefold differences among species were observed in growth between the high and low N stress treatments. Lipid content increased over baseline levels up to 377% and as little as 222% with high N stress. Even with low N stress, lipid increased from 46% to 302%. Lipid productivities reflect the independent effects of N supply on growth and lipid content on each species. To convert
‘‘per L’’ to ‘‘per m2
,’’ multiply by 22.5 L m2
.