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HERO ID
4149683
Reference Type
Journal Article
Title
The effects of eutrophication and acidification on the ecophysiology of Ulva pertusa Kjellman
Author(s)
Kang, JW; Chung, IK
Year
2017
Is Peer Reviewed?
Yes
Journal
Journal of Applied Phycology
ISSN:
0921-8971
EISSN:
1573-5176
Volume
29
Issue
5
Page Numbers
2675-2683
Language
English
DOI
10.1007/s10811-017-1087-5
Web of Science Id
WOS:000413299100051
Abstract
In coastal environments, acidification and eutrophication affect the physiology of marine macroalgae. We investigated the responses of Ulva pertusa Kjellman (Ulvales, Chlorophyta) under such conditions. Samples were cultured at two different pH settings (low, 7.5; high, 8.0) and at three different ammonium levels (low, 4; medium, 60; high, 120 mu M NH4 (+)). Our objective was to analyze the influence that elevated CO2 and NH4 (+) might have on pH, oxygen evolution, rates of nutrient uptake, chlorophyll fluorescence, growth, and C/N ratio of that organism. Variability in pH value was enhanced under low pH/high NH4 (+) and was significantly different (p < 0.05) from changes measured when the high pH/low NH4 (+) combination was applied. Rates of NH4 (+) uptake and relative growth rates by U. pertusa were increased under low pH/high NH4 (+) conditions and that response was significantly different (p < 0.05) from the other treatments. The rate of photosynthetic oxygen evolution and chlorophyll fluorescence were increased under elevated NH4 (+) concentrations (p < 0.05). However, the C/N ratio of U. pertusa was not affected by higher concentrations of CO2 and NH4 (+) (p > 0.05). Our results indicated that the physiological reactions of this alga were heightened when exposed to either the elevated combination of CO2/NH4 (+) or even when only the level of NH4 (+) was raised. Although such excessive growth can lead to bloom formations in coastal areas, this species also has greater capacity for taking up nutrients and dissolved inorganic carbon.
Keywords
Ammonium (NH4+); Carbon dioxide (CO2); Eutrophication; Ocean acidification (OA); Ulva pertusa; Chlorophyceae
Conference Name
22nd International Seaweed Symposium
Conference Location
Copenhagen, Denmark
Conference Dates
June 19- 24, 2016
Tags
NAAQS
•
ISA NOxSOxPM Ecology (2018)
Cited in the Second Draft
Appendix 10
•
ISA NOxSOxPM Ecology (2020- Final Project Page)
Cited
Appendix 10
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