Reduced nitrogenase efficiency dominates response of the globally important nitrogen fixer Trichodesmium to ocean acidification

Luo, Ya‐Wei; Shi, Dalin; Kranz, Sven A.; Hopkinson, Brian M.; Hong, Haizheng; Shen, Rong; Zhang, Futing

doi:10.1038/s41467-019-09554-7

Cited by 37 publications

(31 citation statements)

References 57 publications

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“…For example, a faster bacterial turnover of polysaccharides at a relatively low ocean pH has been found (Piontek et al, 2010). The global N 2 fixation potential of Trichodesmium could be reduced under acidified conditions (Hong et al, 2017;Luo et al, 2019). Although it is difficult to unravel the exact functions of the bacteria, which are indicative of the seawater status, in this study, their changes did have a significant direct contribution to the survival of swimming crabs.…”

Section: Influencing Factors Of Enhanced Crab Survivalmentioning

confidence: 61%

Effects of Elevated pCO2 on the Survival and Growth of Portunus trituberculatus

Lin

2020

Front. Physiol.

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Identifying the response of Portunus trituberculatus to ocean acidification (OA) is critical to understanding the future development of this commercially important Chinese crab species. Recent studies have reported negative effects of OA on crustaceans. Here, we subjected swimming crabs to projected oceanic CO 2 levels (current: 380 µatm; 2100: 750 µatm; 2200: 1500 µatm) for 4 weeks and analyzed the effects on survival, growth, digestion, antioxidant capacity, immune function, tissue metabolites, and gut bacteria of the crabs and on seawater bacteria. We integrated these findings to construct a structural equation model to evaluate the contribution of these variables to the survival and growth of swimming crabs. Reduced crab growth shown under OA is significantly correlated with changes in gut, muscle, and hepatopancreas metabolites whereas enhanced crab survival is significantly associated with changes in the carbonate system, seawater and gut bacteria, and activities of antioxidative and digestive enzymes. In addition, seawater bacteria appear to play a central role in the digestion, stress response, immune response, and metabolism of swimming crabs and their gut bacteria. We predict that if anthropogenic CO 2 emissions continue to rise, future OA could lead to severe alterations in antioxidative, immune, and metabolic functions and gut bacterial community composition in the swimming crabs through direct oxidative stress and/or indirect seawater bacterial roles. These effects appear to mediate improved survival, but at the cost of growth of the swimming crabs.

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Section: Influencing Factors Of Enhanced Crab Survivalmentioning

confidence: 61%

Effects of Elevated pCO2 on the Survival and Growth of Portunus trituberculatus

Lin

2020

Front. Physiol.

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“…Numerous studies have demonstrated that N 2 fixation increases under elevated CO 2 levels in nutrient-replete cultures of both the filamentous species Trichodesmium (Barcelos e Ramos et al, 2007;Hutchins et al, 2007Hutchins et al, , 2013Hutchins et al, , 2015Kranz et al, 2009Kranz et al, , 2010Levitan et al, 2010a,b;Eichner et al, 2014;Walworth et al, 2016a,b) and the unicellular Crocosphaera (Fu et al, 2008;Garcia et al, 2013a,b). However, there are a few studies showing that OA decreased N 2 fixation of the diazotroph (Hong et al, 2017;Luo et al, 2019). While there are disputes over the positive and negative effects of elevated CO 2 concentrations on N 2 fixation in Trichodesmium , it is generally agreed that severe iron (Fe) limitation cancels out (or even reverses) the positive effects of CO 2 on cyanobacterial diazotrophs (Fu et al, 2008;Shi et al, 2012;Walworth et al, 2016a;Hong et al, 2017).…”

Section: Interactions Between Oa Effects and Nitrogen Fixation And Wimentioning

confidence: 99%

Effects of Ocean Acidification on Marine Photosynthetic Organisms Under the Concurrent Influences of Warming, UV Radiation, and Deoxygenation

et al. 2019

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“…How will warming and circulation changes affect the biogeography of diazotrophs, e.g., to what extent may northward spreading of warmer-water diazotrophs and/or habitat contraction for potentially coldadapted diazotrophs alter community composition and BNF activity? D: Ocean acidification alters the carbonate system (Terhaar et al, 2020), stimulating some diazotrophs while suppressing others (Eichner et al, 2014;Luo et al, 2019). What group-specific responses of diazotrophs can be expected in the AO, e.g., will increased undersaturation of calcite selectively affect the diazotroph UCYN-A2 due to the coccolithophore host having a calcifying life-stage (Thompson et al, 2014;Cabello et al, 2020)?…”

Section: Cyanobacterial Diazotrophs May Be Of Higher Relative Abundanmentioning

confidence: 99%

Nitrogen Fixation in a Changing Arctic Ocean: An Overlooked Source of Nitrogen?

Friesen

Riemann

2020

Front. Microbiol.

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The Arctic Ocean is the smallest ocean on Earth, yet estimated to play a substantial role as a global carbon sink. As climate change is rapidly changing fundamental components of the Arctic, it is of local and global importance to understand and predict consequences for its carbon dynamics. Primary production in the Arctic Ocean is often nitrogen-limited, and this is predicted to increase in some regions. It is therefore of critical interest that biological nitrogen fixation, a process where some bacteria and archaea termed diazotrophs convert nitrogen gas to bioavailable ammonia, has now been detected in the Arctic Ocean. Several studies report diverse and active diazotrophs on various temporal and spatial scales across the Arctic Ocean. Their ecology and biogeochemical impact remain poorly known, and nitrogen fixation is so far absent from models of primary production in the Arctic Ocean. The composition of the diazotroph community appears distinct from other oceans – challenging paradigms of function and regulation of nitrogen fixation. There is evidence of both symbiotic cyanobacterial nitrogen fixation and heterotrophic diazotrophy, but large regions are not yet sampled, and the sparse quantitative data hamper conclusive insights. Hence, it remains to be determined to what extent nitrogen fixation represents a hitherto overlooked source of new nitrogen to consider when predicting future productivity of the Arctic Ocean. Here, we discuss current knowledge on diazotroph distribution, composition, and activity in pelagic and sea ice-associated environments of the Arctic Ocean. Based on this, we identify gaps and outline pertinent research questions in the context of a climate change-influenced Arctic Ocean – with the aim of guiding and encouraging future research on nitrogen fixation in this region.

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Reduced nitrogenase efficiency dominates response of the globally important nitrogen fixer Trichodesmium to ocean acidification

Cited by 37 publications

References 57 publications

Effects of Elevated pCO2 on the Survival and Growth of Portunus trituberculatus

Effects of Elevated pCO2 on the Survival and Growth of Portunus trituberculatus

Effects of Ocean Acidification on Marine Photosynthetic Organisms Under the Concurrent Influences of Warming, UV Radiation, and Deoxygenation

Nitrogen Fixation in a Changing Arctic Ocean: An Overlooked Source of Nitrogen?

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