Abstract The net photosynthesis of four ulvoid green algae [Monostroma grevillei (Thuret) Wittrock, M. pulchrum Farlow, Ulvaria obscura (K tz.) Gayral var. blyttii (Aresch.) Bliding and U. oxysperma (K tz.) Bliding] that exhibit different patterns of seasonal occurrence and local distributions within coastal and estuarine habitats of northern New England, USA were evaluated under various light, temperature and salinity conditions. Monostroma pulchrum had the highest light compensation level (/. e. 20--40 m"2 s""1)» while the other three species had compensation points of 3-8 ~28"·1. The light saturation values for the different species varied from 40 m"2 s"1 (U. oxysperma) to more than 564 m"2 s"1 (M. grevillei and M. pulchrum), with U. obscura var. blyttii exhibiting intermediate light optima (120 ""25~1). The temperature optima and tolerances of the various species were closely related to their patterns of seasonal occurrences. Thus, the winter-spring annuals M. grevillei and M. pulchrum exhibited low thermal optima (5 --10°C) and salinity tolerances (M. grevillei, 18°C at 10%o and 21 °C at 30%0; M. pulchrum, 22 °C at 10%o and 24 °C at 30%o), while the summer annual U. oxysperma exhibited higher temperature optima (15 -- 25 °C) and tolerances (about 32 °C). The
Botanica Marina – de Gruyter
Published: Jan 1, 1992
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