Physiological responses of a bloom-forming green macroalga to short-term change in salinity,nutrients, and light help explain its ecological success |
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| Authors: | Email author" target="_blank">Risa?A?CohenEmail author Peggy?Fong |
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| Institution: | 1.Department of Organismic Biology, Ecology and Evolution,University of California,Los Angeles |
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| Abstract: | Enteromorpha intestinalis is a bloom-forming species of macroalgae associated with eutrophication. The objective of this study was to investigate how
this alga performs osmoregulation and nutrient uptake in order to proliferate under environmental conditions that covary with
eutrophication. We quantified the response ofE. intestinalis to salinity, light, and nutrients. We performed two short-term (48 h) laboratory experiments (salinity alone and salinity
× nutrients × light) to examine the algal responses of tissue water, potassium (K+), and nutrient (NO
3
−
and total N) content. Tissue water content decreased with increasing salinity, and although K+ concentration decreased from the initial concentration, it decreased less with increased salinity treatment demonstrating
two mechanisms to withstand short-term salinity fluctuation. The salinity × nutrient × light experiment showed that, in the
short term, light had an interaction with tissue K+. Total tissue N content was positively related to N treatment level, and light did not affect total nutrient concentration.
The effect of light was present whether the nutrients were present in the tissue as inorganic or organic forms. With reduced
light, we hypothe size that the assimilation of inorganic to organic N was energy limited. The ability of this alga to take
up available nutrients rapidly for growth and short-term osmoregulation, even under low light and salinity levels, helps to
explain the bloom potential ofE. intestinalis. |
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