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  The effect of constant darkness and short light periods on the survival and physiological fitness of two phytoplankton species and their growth potential after re-illumination

Walter, B., Peters, J., & van Beusekom, J. E. E. (2017). The effect of constant darkness and short light periods on the survival and physiological fitness of two phytoplankton species and their growth potential after re-illumination. Aquatic Ecology, 51, 591-603. doi:10.1007/s10452-017-9638-z.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-550E-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-5510-7
Genre: Journal Article

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10.1007_s10452-017-9638-z.pdf (Publisher version), 790KB
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 Creators:
Walter, Bettina1, Author              
Peters, Janna1, Author
van Beusekom, Justus E. E.2, Author
Affiliations:
1The CliSAP Cluster of Excellence, External Organizations, ou_1832285              
2external, ou_persistent22              

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Free keywords: AUREOCOCCUS-ANOPHAGEFFERENS PELAGOPHYCEAE; PROLONGED DARKNESS; MARINE DIATOM; SPRING BLOOM; SHORT-TERM; DETONULA-CONFERVACEA; SEASONAL CYCLES; RESTING SPORES; ATLANTIC-OCEAN; PHOTOSYSTEM-IIEnvironmental Sciences & Ecology; Marine & Freshwater Biology; Light limitation; Dark survival; Growth; Ocean mixing; PAM fluorometry; Phytoplankton physiology; Re-illumination;
 Abstract: We tested the survival potential and fitness of two different algae strains (the diatom Thalassiosira weissflogii and the cryptophyceae Rhodomonas sp.) under different growth conditions (complete darkness and short light intervals, simulating conditions in a deep mixed water column) at different temperatures, plus the effect of these conditions on the physiological fitness and growth after re-illumination was examined. Both species survived the experimental conditions without significant cell loss or physiological damage. Two different survival strategies were observed: (1) the diatom T. weissflogii immediately reduced its metabolic rate and stopped cell division. The effect on chlorophyll a (chl-a) content and photosynthetic capacity was negligible. At 10 degrees C, T. weissflogii used the short light windows to metabolize carbohydrates and growth. (2) The cryptophyte Rhodomonas sp. initially continued to grow after transfer into all trials. However, the cell number decreased after day 6. Carbohydrate and chl-a content went on to decrease dramatically (70 and 50%, respectively). After 3 days of re-illumination, T. weissflogii grew faster than of Rhodomonas sp.. The diatom seemed to benefit from better start conditions and would out-compete the cryptophyte during a spring bloom. Our results highlight that these algae groups have different strategies in dealing with darkness, which potentially endow diatoms with a competitive advantage in deep mixed waters and in the season of early spring.

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Language(s): eng - English
 Dates: 2017
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000414689100007
DOI: 10.1007/s10452-017-9638-z
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Title: Aquatic Ecology
Source Genre: Journal
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Publ. Info: Springer
Pages: - Volume / Issue: 51 Sequence Number: - Start / End Page: 591 - 603 Identifier: ISSN: 1386-2588