Acidification of subsurface coastal waters enhanced by eutrophication

Cai, Wei‐Jun; Hu, Xinping; Huang, Wei‐Jen; Murrell, Michael C.; Lehrter, John C.; Lohrenz, Steven E.; Chou, Wei‐Lung; Zhai, Weidong; Hollibaugh, James T.; Wang, Yongchen; Zhao, Pingsan; Guo, Xianghui; Gundersen, K.; Dai, Minhan; Gong, Gwo‐Ching

doi:10.1038/ngeo1297

Cited by 1,024 publications

(855 citation statements)

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“…It has been reported that eutrophication problems in coastal regions lead to complex cross-linkages between ocean acidification and eutrophication (Cai et al, 2011). The occurrence of ocean acidification combined with other environmental stressors such as eutrophication can potentially produce synergistic or antagonistic effects on bacterioplankton that differ from those caused by ocean acidification alone.…”

Section: Introductionmentioning

confidence: 99%

Interactive network configuration maintains bacterioplankton community structure under elevated CO<sub>2</sub> in a eutrophic coastal mesocosm experiment

Lin¹,

Huang²,

Li³

et al. 2018

Biogeosciences

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Abstract. There is increasing concern about the effects of ocean acidification on marine biogeochemical and ecological processes and the organisms that drive them, including marine bacteria. Here, we examine the effects of elevated CO 2 on the bacterioplankton community during a mesocosm experiment using an artificial phytoplankton community in subtropical, eutrophic coastal waters of Xiamen, southern China. Through sequencing the bacterial 16S rRNA gene V3-V4 region, we found that the bacterioplankton community in this high-nutrient coastal environment was relatively resilient to changes in seawater carbonate chemistry. Based on comparative ecological network analysis, we found that elevated CO 2 hardly altered the network structure of high-abundance bacterioplankton taxa but appeared to reassemble the community network of low abundance taxa. This led to relatively high resilience of the whole bacterioplankton community to the elevated CO 2 level and associated chemical changes. We also observed that the Flavobacteria group, which plays an important role in the microbial carbon pump, showed higher relative abundance under the elevated CO 2 condition during the early stage of the phytoplankton bloom in the mesocosms. Our results provide new insights into how elevated CO 2 may influence bacterioplankton community structure.

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Section: Introductionmentioning

confidence: 99%

Interactive network configuration maintains bacterioplankton community structure under elevated CO<sub>2</sub> in a eutrophic coastal mesocosm experiment

Lin¹,

Huang²,

Li³

et al. 2018

Biogeosciences

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“…Hofmann et al 2011; Table 2), driven by the metabolic signal to seasonal and decadal oscillations with amplitudes >0.3 pH units (e.g. Borges and Gypens 2010;Provoost et al 2010;Barton et al 2012;Cai et al 2011;Hofmann et al 2011;Mercado and Gordillo 2011;Waldbusser et al 2011;Melzner et al 2013; Fig. 1).…”

Section: Regulation Of Seawater Ph In the Pre-disturbed Holocene Oceanmentioning

confidence: 99%

“…Borges and Gypens 2010;Provoost et al 2010;Cai et al 2011;Hofmann et al 2011). Hence, how the pH of coastal ecosystems in year 2100 will differ from current ones is difficult to predict due to lack of understanding of the average values and their variability in current environments and of the future trajectories of the multiple factors affecting coastal pH compared to the open ocean.…”

Section: Introductionmentioning

confidence: 99%

Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH

Duarte

Hendriks

Moore

et al. 2013

Estuaries and Coasts

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Ocean acidification due to anthropogenic CO 2 emissions is a dominant driver of long-term changes in pH in the open ocean, raising concern for the future of calcifying organisms, many of which are present in coastal habitats. However, changes in pH in coastal ecosystems result from a multitude of drivers, including impacts from watershed processes, nutrient inputs, and changes in ecosystem structure and metabolism. Interaction between ocean acidification due to anthropogenic CO 2 emissions and the dynamic regional to local drivers of coastal ecosystems have resulted in complex regulation of pH in coastal waters. Changes in the watershed can, for example, lead to changes in alkalinity and CO 2 fluxes that, together with metabolic processes and oceanic dynamics, yield high-magnitude decadal changes of up to 0.5 units in coastal pH. Metabolism results in strong diel to seasonal fluctuations in pH, with characteristic ranges of 0.3 pH units, with metabolically intense habitats exceeding this range on a daily basis. The intense variability and multiple, complex controls on pH implies that the concept of ocean acidification due to anthropogenic CO 2 emissions cannot be transposed to coastal ecosystems directly. Furthermore, in coastal ecosystems, the detection of trends towards acidification is not trivial and the attribution of these changes to anthropogenic CO 2 emissions is even more problematic. Coastal ecosystems may show acidification or basification, depending on the balance between the invasion of coastal waters by anthropogenic CO 2 , watershed export of alkalinity, organic matter and CO 2 , and changes in the balance between primary production, respiration and calcification rates in response to changes in nutrient inputs and losses of ecosystem components. Hence, we contend that ocean acidification from anthropogenic CO 2 is largely an open-ocean syndrome and that a concept of anthropogenic impacts on marine pH, which is applicable across the entire ocean, from coastal to open-ocean environments, provides a superior framework to consider the multiple components of the anthropogenic perturbation of marine pH trajectories. The concept of anthropogenic impacts on seawater pH acknowledges that a regional focus is necessary to predict future trajectories in the pH of coastal waters and points at opportunities to manage these trajectories locally to conserve coastal organisms vulnerable to ocean acidification.

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“…However, most marine species studied largely inhabit highly variable coastal environments, such as coral reefs, intertidal, sandy or rocky shores, upwelling zones, estuaries or fjords, salt marshes and so on, where pH/p CO2 levels vary far more dramatically over different temporal and spatial scales than in open ocean environments 12 . Such variability results from a number of natural and anthropogenic coastal processes such as river discharges, upwelling, ice melting, eutrophication, pollution and so on [13][14][15] . Indeed, many nearshore areas experience intense pH/p CO2 fluctuations, with levels of variability often being significantly higher than would be expected if driven solely …”

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confidence: 99%

Species-specific responses to ocean acidification should account for local adaptation and adaptive plasticity

et al. 2017

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Global stressors, such as ocean acidification, constitute a rapidly emerging and significant problem for marine organisms, ecosystem functioning and services. The coastal ecosystems of the Humboldt Current System (HCS) off Chile harbour a broad physical-chemical latitudinal and temporal gradient with considerable patchiness in local oceanographic conditions. This heterogeneity may, in turn, modulate the specific tolerances of organisms to climate stress in species with populations distributed along this environmental gradient. Negative response ratios are observed in species models (mussels, gastropods and planktonic copepods) exposed to changes in the partial pressure of CO 2 (p CO2 ) far from the average and extreme p CO2 levels experienced in their native habitats. This variability in response between populations reveals the potential role of local adaptation and/or adaptive phenotypic plasticity in increasing resilience of species to environmental change. The growing use of standard ocean acidification scenarios and treatment levels in experimental protocols brings with it a danger that inter-population differences are confounded by the varying environmental conditions naturally experienced by different populations. Here, we propose the use of a simple index taking into account the natural p CO2 variability, for a better interpretation of the potential consequences of ocean acidification on species inhabiting variable coastal ecosystems. Using scenarios that take into account the natural variability will allow understanding of the limits to plasticity across organismal traits, populations and species.

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Acidification of subsurface coastal waters enhanced by eutrophication

Cited by 1,024 publications

References 28 publications

Interactive network configuration maintains bacterioplankton community structure under elevated CO<sub>2</sub> in a eutrophic coastal mesocosm experiment

Interactive network configuration maintains bacterioplankton community structure under elevated CO<sub>2</sub> in a eutrophic coastal mesocosm experiment

Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH

Species-specific responses to ocean acidification should account for local adaptation and adaptive plasticity

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Acidification of subsurface coastal waters enhanced by eutrophication

Cited by 1,024 publications

References 28 publications

Interactive network configuration maintains bacterioplankton community structure under elevated CO&lt;sub&gt;2&lt;/sub&gt; in a eutrophic coastal mesocosm experiment

Interactive network configuration maintains bacterioplankton community structure under elevated CO&lt;sub&gt;2&lt;/sub&gt; in a eutrophic coastal mesocosm experiment

Is Ocean Acidification an Open-Ocean Syndrome? Understanding Anthropogenic Impacts on Seawater pH

Species-specific responses to ocean acidification should account for local adaptation and adaptive plasticity

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Interactive network configuration maintains bacterioplankton community structure under elevated CO<sub>2</sub> in a eutrophic coastal mesocosm experiment

Interactive network configuration maintains bacterioplankton community structure under elevated CO<sub>2</sub> in a eutrophic coastal mesocosm experiment