Physiological Ecology of Four Ulvoid Green Algae

Physiological Ecology of Four Ulvoid Green Algae 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

Physiological Ecology of Four Ulvoid Green Algae

Botanica Marina, Volume 35 (6) – Jan 1, 1992

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Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0006-8055
eISSN
1437-4323
DOI
10.1515/botm.1992.35.6.523
Publisher site
See Article on Publisher Site

Abstract

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

Journal

Botanica Marinade Gruyter

Published: Jan 1, 1992

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