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Aerial exposure and desiccation tolerances are correlated to species composition in “green tides” of the Salish Sea (northeastern Pacific) by Timothy A. Nelson; Jennifer Olson; Lydia Imhoff; Amorah V. Nelson is a Earth and Planetary Sciences article available to read on EtoBox.

What is Aerial exposure and desiccation tolerances are correlated to species composition in “green tides” of the Salish Sea (northeastern Pacific) about?

## Abstract Relatively little is known about the causes of species distribution within macroalgal blooms occurring on or over soft substrata. We examine the roles of aerial exposure and desiccation in determining elevational patterns of two dominant bloom-forming ulvoid algae, __Ulva lactuca__ and __Ulvaria obscura__, on the northeastern Pacific coast. These species were stressed with constant desiccation time, desiccation to a constant water potential, and desiccation to a fixed water loss. As a measure of health, we examined net photosynthesis by oxygen evolution or photosynthetic yield via pulse amplitude modulated fluorometry. By all measures, __Ulva__ was physiologically superior in the intertidal zone. Under constant exposure, it desiccated more slowly than __Ulvaria__. When desiccated to a constant dryness, __Ulva__ better maintained photosynthetic parameters. These observations are consistent with __Ulva__'s usual dominance over __Ulvaria__ in intertidal macroalgal blooms. Given these and other observed differences between the two species, natural resource managers should not regard the two as ecologically equivalent, even though they have similar functional forms.

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Author

Timothy A. Nelson; Jennifer Olson; Lydia Imhoff; Amorah V. Nelson

Publisher

Walter de Gruyter GmbH

Published

2010

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)