Journal Title
Title of Journal: J Appl Phycol
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Abbravation: Journal of Applied Phycology
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Publisher
Springer Netherlands
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Authors: MingLi Teoh SiewMoi Phang WanLoy Chu
Publish Date: 2012/06/17
Volume: 25, Issue: 1, Pages: 285-297
Abstract
The global temperature increase has significant implications on the survival of microalgae which form the basis of all aquatic food webs The aim of this study was to compare the response of similar taxa of microalgae from the Antarctic Chlamydomonas UMACC 229 Chlorella UMACC 237 and Navicula glaciei UMACC 231 temperate Chlamydomonas augustae UMACC 247 Chlorella vulgaris UMACC 248 and Navicula incerta UMACC 249 and tropical C augustae UMACC 246 C vulgaris UMACC 001 and Amphiprora UMACC 239 regions to changing temperature The Antarctic temperate and tropical strains were grown over specific temperature ranges of 4 °C to 30 °C 4 °C to 32 °C and 13 °C to 38 °C respectively The three Antarctic strains survived at temperatures much higher than their ambient regime In comparison the tropical strains are already growing at their upper temperature limits The three Chlorella strains from different regions are eurythermal with a large overlap on tolerance ranging from 4 °C to 38 °C The specific growth rate μ of the Antarctic Navicula decreased 034 day−1 at temperatures above 4 °C showing it to be sensitive to temperature increase If further warming of Earth occurs N glaciei UMACC 231 is likely to have the most deleterious consequences than the other two Antarctic microalgae studied The percentage of polyunsaturated fatty acids PUFA decreased with increasing temperature in the Antarctic Navicula As temperature increases the growth and nutritional value of this commonly occurring diatom in the Antarctic may decrease with consequences for the aquatic food web Of the three Chlamydomonas strains only the Antarctic strain produced predominantly PUFA especially 163 484–572 total fatty acidsThis study was funded by a research grant from the Ministry of Science Technology and Innovation MOSTI Malaysia coordinated by the Academy of Sciences Malaysia ASM The first author would like to thank MOSTI for the Pasca Postgraduate Fellowship Thanks are also due to the berths offered by the Australian Antarctic Division AAD and the staff of Casey Station Antarctica for their field assistance in sample collection This research formed part of the International Polar Year IPY Project EOI No 96 under the consortium project IPY EOI 429 on Microbiological and Ecological Responses to Global Environmental Changes in Polar Regions MERGE
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