Global patterns in oceanic planktonic metabolism

Regaudie-de-Gioux, Aurore; Duarte, Carlos M.

doi:10.4319/lo.2013.58.3.0977

Cited by 31 publications

(46 citation statements)

References 45 publications

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“…In our dataset, volumetric CR scaled as the 0.66 power of GPP overall (0.56, 0.77, and 0.98 powers in open sea, coral reef, and coastal ecosystems respectively; Table 5), in good agreement with previous estimates: 0.79 reported by Regaudie-de-Gioux and Duarte (2013), 0.50 by Duarte and Agustí (1998), and 0.62 by Robinson and Williams (2005). For the relationship between CR and NCP the scaling factors were all lower, confirming the pattern that CR increases more slowly with overall productivity than NCP (Duarte and Agustí, 1998).…”

Section: Environmental Determinants Of Metabolismsupporting

confidence: 80%

“…The scaling factors between CR and both GPP and NCP were highest in coastal ecosystems, and lowest in the open sea (Table 5; Figure 5). Overall, in our dataset the regression of GPP on Chl a explained 50% of the variance across all study regions (Table 6), in contrast to the study of Regaudie-de-Gioux and Duarte (2013) where only 30% of the variance (from mostly oceanic stations) was explained.…”

Section: Environmental Determinants Of Metabolismmentioning

confidence: 59%

“…Few measurements of plankton CR are available for the tropical ocean and from the southern hemisphere in general (Robinson and Williams, 2005;Regaudie-de-Gioux and Duarte, 2013). Our data greatly expand the information available for shelf seas but include only a few oceanic data points.…”

Section: Discussionmentioning

confidence: 87%

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Plankton Respiration, Production, and Trophic State in Tropical Coastal and Shelf Waters Adjacent to Northern Australia

et al. 2017

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In a changing ocean, tropical waters can be instructive as to the potential effects of climate induced changes on marine ecosystem structure and function. We describe the relationships between planktonic community respiration (CR), net community production (NCP), gross primary production (GPP), and environmental variables in 14 regions and three ecosystem types (coastal, coral reef, and open sea) from Australia, Papua New Guinea, and Indonesia. The data are compiled from separate studies conducted between 2002 and 2014 with the goal of better parameterizing the metabolic balance in tropical marine waters. Overall, these regions were strongly autotrophic (average GPP:CR ratio: 2.14 ± 0.98), though our dataset of 783 paired measurements did include some oceanic stations where heterotrophy (GPP:CR < 1) was predominant, and some coastal stations that were intermittently heterotrophic. Our statistical analysis suggested that temperature was the most important determinant of CR in coral reef and ocean ecosystems but less so in coastal ecosystems, where chlorophyll concentration was more important. In contrast, chlorophyll and sampling depth were more important in regulating GPP than temperature. The relationships between temperatures and metabolic rates showed that these were ecosystem-dependent, with coastal ecosystems showing less response to temperature than coral reef and open sea sites. The threshold of GPP to achieve metabolic balance fell in a range between 0.715 mmol O 2 m −3 d −1 in the Coral Sea to 10.052 mmol O 2 m −3 d −1 in mangrove waterways of Hinchinbrook Channel. These data allow regions in and around northern Australia to be ranked in terms of trophic state, ranging from the oligotrophic Scott Reef (GPP:CR = 0.84 ± 0.08) to productive surface waters of the Kimberley coast (GPP:CR = 5.21 ± 0.62). The measurement of pelagic metabolism shows potential as a quantitative tool to monitor the trophic state of coastal waters.

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Section: Environmental Determinants Of Metabolismsupporting

confidence: 80%

Section: Environmental Determinants Of Metabolismmentioning

confidence: 59%

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Plankton Respiration, Production, and Trophic State in Tropical Coastal and Shelf Waters Adjacent to Northern Australia

et al. 2017

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“…Moreover, warming does not occur in isolation but concurrently with other stresses, such as pollutant inputs (Duarte, 2014), where warming can amplify the sensitivity of organisms to other stresses. For instance, research in a Mediterranean Bay has shown that the probability of hypoxia increases with temperature (Vaquer-Sunyer et al, 2012), while warming also increases metabolic oxygen consumption (Regaudie-de-Gioux and Duarte, 2013) and raises the thresholds of oxygen concentration for hypoxia-induced stresses in marine organisms (Vaquer-Sunyer and Duarte, 2011). Hence, the geometric mean empirical activation energy of 1.58 ± 0.48 eV reported here for marine Mediterranean biota compounds the direct and indirect effects of warming and identifies a steeper response to warming than expected based on metabolic theory alone.…”

Section: Discussionmentioning

confidence: 99%

Footprints of climate change on Mediterranean Sea biota

et al. 2015

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The Mediterranean Sea ranks among the ocean regions warming fastest. There is evidence for impacts of climate change on marine Mediterranean organisms but a quantitative assessment is lacking. We compiled the impacts of warming reported in the literature to provide a quantitative assessment for the Mediterranean Sea. During the last three decades the summer surface temperature has increased 1.15 • C. Strong heat wave events have occurred in years 1994, 2003, and 2009. Impacts of warming are evident on growth, survival, fertility, migration and phenology of pelagic and benthic organisms, from phytoplankton to marine vegetation, invertebrates and vertebrates. Overall, 50% of biological impacts in the Mediterranean Sea occur at summer surface temperature anomaly 4.5 • ≤ C and at summer surface temperature of 27.5 • C. The activation energy (geometric mean 1.58 ± 0.48 eV), the slope of the Arrhenius equation describing the temperature-dependence of biological processes, for the response of Mediterranean marine biota to warming reveals that these responses in the Mediterranean are far steepest than possibly explained by the direct effect of warming alone. The observations are biased toward the northern and western sectors of the basin, likely underestimating the impacts of warming in areas where warming is particularly intense.

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“…The less than unity slope signifies that metabolic activity by microbial heterotrophs declines relative to that of autotrophic microbes as total metabolic demands increase. Similar relationships in which bacterioplankton biomass is 'dampened in amplitude but coherent in the direction of change' relative to chlorophyll a concentration have been described [49][50][51].…”

Section: (C) Effects Of Island Sizementioning

confidence: 66%

Energetic differences between bacterioplankton trophic groups and coral reef resistance

et al. 2016

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Coral reefs are among the most productive and diverse marine ecosystems on the Earth. They are also particularly sensitive to changing energetic requirements by different trophic levels. Microbialization specifically refers to the increase in the energetic metabolic demands of microbes relative to macrobes and is significantly correlated with increasing human influence on coral reefs. In this study, metabolic theory of ecology is used to quantify the relative contributions of two broad bacterioplankton groups, autotrophs and heterotrophs, to energy flux on 27 Pacific coral reef ecosystems experiencing human impact to varying degrees. The effective activation energy required for photosynthesis is lower than the average energy of activation for the biochemical reactions of the Krebs cycle, and changes in the proportional abundance of these two groups can greatly affect rates of energy and materials cycling. We show that reef-water communities with a higher proportional abundance of microbial autotrophs expend more metabolic energy per gram of microbial biomass. Increased energy and materials flux through fast energy channels (i.e. water-column associated microbial autotrophs) may dampen the detrimental effects of increased heterotrophic loads (e.g. coral disease) on coral reef systems experiencing anthropogenic disturbance.

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Global patterns in oceanic planktonic metabolism

Cited by 31 publications

References 45 publications

Plankton Respiration, Production, and Trophic State in Tropical Coastal and Shelf Waters Adjacent to Northern Australia

Plankton Respiration, Production, and Trophic State in Tropical Coastal and Shelf Waters Adjacent to Northern Australia

Footprints of climate change on Mediterranean Sea biota

Energetic differences between bacterioplankton trophic groups and coral reef resistance

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