Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13718 |
Symbiodinium mitigate the combined effects of hypoxia and acidification on a noncalcifying cnidarian | |
Klein, Shannon G.1,2; Pitt, Kylie A.1; Nitschke, Matthew R.3; Goyen, Samantha3; Welsh, David T.4; Suggett, David J.3; Carroll, Anthony R.4 | |
2017-09-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; Saudi Arabia |
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 O-2 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 O-2 (similar to 2.09 mg/L) and pH (similar to 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 O-2 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 O-2 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. |
英文关键词 | asexual reproduction Cassiopea sp. elevated pCO(2) jellyfish low DO low pH photosynthesis symbionts zooxanthellae |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000406812100022 |
WOS关键词 | OCEAN ACIDIFICATION ; INTRACELLULAR PH ; SEAWATER ACIDIFICATION ; SPECIES BOUNDARIES ; MYTILUS-EDULIS ; CLIMATE-CHANGE ; TERM HYPOXIA ; SEA-ANEMONES ; CORAL ; OXYGEN |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17455 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Griffith Univ, Australian Rivers Inst Coasts & Estuaries, Griffith Sch Environm, Gold Coast, Qld, Australia; 2.KAUST, RSRC, Thuwal, Saudi Arabia; 3.Univ Technol Sydney, Climate Change Cluster C3, Sydney, NSW, Australia; 4.Griffith Univ, Griffith Sch Environm, Environm Futures Res Inst, Gold Coast, Qld, Australia |
推荐引用方式 GB/T 7714 | Klein, Shannon G.,Pitt, Kylie A.,Nitschke, Matthew R.,et al. Symbiodinium mitigate the combined effects of hypoxia and acidification on a noncalcifying cnidarian[J]. GLOBAL CHANGE BIOLOGY,2017,23(9). |
APA | Klein, Shannon G..,Pitt, Kylie A..,Nitschke, Matthew R..,Goyen, Samantha.,Welsh, David T..,...&Carroll, Anthony R..(2017).Symbiodinium mitigate the combined effects of hypoxia and acidification on a noncalcifying cnidarian.GLOBAL CHANGE BIOLOGY,23(9). |
MLA | Klein, Shannon G.,et al."Symbiodinium mitigate the combined effects of hypoxia and acidification on a noncalcifying cnidarian".GLOBAL CHANGE BIOLOGY 23.9(2017). |
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