globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13718
论文题名:
Symbiodinium mitigate the combined effects of hypoxia and acidification on a noncalcifying cnidarian
作者: Klein S.G.; Pitt K.A.; Nitschke M.R.; Goyen S.; Welsh D.T.; Suggett D.J.; Carroll A.R.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:9
起始页码: 3690
结束页码: 3703
语种: 英语
英文关键词: asexual reproduction ; Cassiopea sp. ; elevated pCO2 ; jellyfish ; low DO ; low pH ; photosynthesis ; symbionts ; zooxanthellae
Scopus关键词: Cassiopea sp. ; Cnidaria ; Scyphozoa ; Symbiodinium
英文摘要: Anthropogenic nutrient inputs enhance microbial respiration within many coastal ecosystems, driving concurrent hypoxia and acidification. During photosynthesis, Symbiodinium spp., the microalgal endosymbionts of cnidarians and other marine phyla, produce O2 and assimilate CO2 and thus potentially mitigate the exposure of the host to these stresses. However, such a role for Symbiodinium remains untested for noncalcifying cnidarians. We therefore contrasted the fitness of symbiotic and aposymbiotic polyps of a model host jellyfish (Cassiopea sp.) under reduced O2 (~2.09 mg/L) and pH (~ 7.63) scenarios in a full-factorial experiment. Host fitness was characterized as asexual reproduction and their ability to regulate internal pH and Symbiodinium performance characterized by maximum photochemical efficiency, chla content and cell density. Acidification alone resulted in 58% more asexual reproduction of symbiotic polyps than aposymbiotic polyps (and enhanced Symbiodinium cell density) suggesting Cassiopea sp. fitness was enhanced by CO2-stimulated Symbiodinium photosynthetic activity. Indeed, greater CO2 drawdown (elevated pH) was observed within host tissues of symbiotic polyps under acidification regardless of O2 conditions. Hypoxia alone produced 22% fewer polyps than ambient conditions regardless of acidification and symbiont status, suggesting Symbiodinium photosynthetic activity did not mitigate its effects. Combined hypoxia and acidification, however, produced similar numbers of symbiotic polyps compared with aposymbiotic kept under ambient conditions, demonstrating that the presence of Symbiodinium was key for mitigating the combined effects of hypoxia and acidification on asexual reproduction. We hypothesize that this mitigation occurred because of reduced photorespiration under elevated CO2 conditions where increased net O2 production ameliorates oxygen debt. We show that Symbiodinium play an important role in facilitating enhanced fitness of Cassiopea sp. polyps, and perhaps also other noncalcifying cnidarian hosts, to the ubiquitous effects of ocean acidification. Importantly we highlight that symbiotic, noncalcifying cnidarians may be particularly advantaged in productive coastal waters that are subject to simultaneous hypoxia and acidification. © 2017 John Wiley & Sons Ltd
资助项目: Funding for this study was provided by Griffith University and an Australian Post-Graduate Award to S.G.K. The contribution of D.J.S. and M.R.N. to this work was supported through an Australian Research Council (ARC) Discovery Grant DP160100271. We thank W. Bennett, F. Leusch and D. Tonzing for technical assistance and J. Arthur and J. Hay for statistical advice. We also thank A. Reno and K. Wilson from Underwater World, Sunshine Coast, Australia, for cultures of Cassiopea sp. polyps.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60816
Appears in Collections:影响、适应和脆弱性

Files in This Item:

There are no files associated with this item.


作者单位: Australian Rivers Institute – Coasts and Estuaries, Griffith School of Environment, Griffith University, Gold Coast, QLD, Australia; Red Sea Research Center (RSRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia; Climate Change Cluster (C3), University of Technology Sydney, Sydney, NSW, Australia; Environmental Futures Research Institute, Griffith School of Environment, Griffith University, Gold Coast, QLD, Australia

Recommended Citation:
Klein S.G.,Pitt K.A.,Nitschke M.R.,et al. Symbiodinium mitigate the combined effects of hypoxia and acidification on a noncalcifying cnidarian[J]. Global Change Biology,2017-01-01,23(9)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Klein S.G.]'s Articles
[Pitt K.A.]'s Articles
[Nitschke M.R.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Klein S.G.]'s Articles
[Pitt K.A.]'s Articles
[Nitschke M.R.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Klein S.G.]‘s Articles
[Pitt K.A.]‘s Articles
[Nitschke M.R.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.