TY - JOUR
T1 - Effects of hypoxia on growth of the diatom Skeletonema costatum
AU - Wu, R.S.S.
AU - Wo, K.T.
AU - Chiu, J.M.Y.
N1 - Funding Information:
We are grateful to the anonymous reviewer, whose comments and suggestions have helped us to improve the manuscript. The work described in this paper was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (AoE/P-04/04). [SS]
Publisher copyright:
Copyright © 2012 Elsevier B.V. All rights reserved.
PY - 2012/6/1
Y1 - 2012/6/1
N2 - Hypoxia, defined as dissolved oxygen falls below 2.8 mg O2 L− 1, affects several 100,000 km2 of marine water worldwide. Previous studies have shown that hypoxia results in aberrant behaviors of benthic fauna, collapse of fisheries, and major changes in the structure and trophodynamics of marine ecosystems. Nevertheless, it is not known whether, and if so how, hypoxia can affect the phytoplankton, which accounts for the major part of the primary productivity of marine ecosystems. The present study investigated the effects of hypoxia on the growth of the diatom Skeletonema costatum. Diatoms were cultured at three levels of oxygen (i.e. 7.0, 2.0, 0.5 mg O2 L− 1) for 14 days, and the biological endpoints (i.e. cell size, cell density, optical density, chlorophyll a concentration, adenylate energy charge) were measured at 0, 1, 3, 5, 7, and 14 days. Our results demonstrated that all metrics and the calculated specific growth rate over the 14 day experimental period were negatively affected by 0.5 mg O2 L− 1. Results of this study, for the first time, provided the evidence and important insight of the impacts of hypoxia on the functions of phytoplankton in marine ecosystems.
AB - Hypoxia, defined as dissolved oxygen falls below 2.8 mg O2 L− 1, affects several 100,000 km2 of marine water worldwide. Previous studies have shown that hypoxia results in aberrant behaviors of benthic fauna, collapse of fisheries, and major changes in the structure and trophodynamics of marine ecosystems. Nevertheless, it is not known whether, and if so how, hypoxia can affect the phytoplankton, which accounts for the major part of the primary productivity of marine ecosystems. The present study investigated the effects of hypoxia on the growth of the diatom Skeletonema costatum. Diatoms were cultured at three levels of oxygen (i.e. 7.0, 2.0, 0.5 mg O2 L− 1) for 14 days, and the biological endpoints (i.e. cell size, cell density, optical density, chlorophyll a concentration, adenylate energy charge) were measured at 0, 1, 3, 5, 7, and 14 days. Our results demonstrated that all metrics and the calculated specific growth rate over the 14 day experimental period were negatively affected by 0.5 mg O2 L− 1. Results of this study, for the first time, provided the evidence and important insight of the impacts of hypoxia on the functions of phytoplankton in marine ecosystems.
UR - http://www.scopus.com/inward/record.url?scp=84860329087&partnerID=8YFLogxK
U2 - 10.1016/j.jembe.2012.04.003
DO - 10.1016/j.jembe.2012.04.003
M3 - Journal article
AN - SCOPUS:84860329087
SN - 0022-0981
VL - 420-421
SP - 65
EP - 68
JO - Journal of Experimental Marine Biology and Ecology
JF - Journal of Experimental Marine Biology and Ecology
ER -