Global warming offsets the ecophysiological stress of ocean acidification on temperate crustose coralline algae

Kim, Ju-Hyoung; Kim, Nahyun; Moon, Hanbi; Lee, Sukyeon; Jeong, So Young; Díaz-Pulido, Guillermo; Edwards, Matthew S.; Kang, J. W.; Kang, Eun Ju; Oh, Hyun-Ju; Hwang, Jae-Dong; Kim, Il-Nam

doi:10.1016/j.marpolbul.2020.111324

Cited by 31 publications

(33 citation statements)

References 51 publications

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“…2018, Kim et al. 2020). Therefore, differences in rhodolith microhabitat complexity (or density) due to changes in size and branching densities can greatly influence whole rhodolith photosynthesis.…”

Section: Discussionmentioning

confidence: 98%

“…2018, Kim et al. 2020). Quantifying specific thallus‐related differences in photosynthesis and respiration, and the effects of these microinvertebrates and detritus is instrumental to understanding how rhodolith ecophysiology may change as thalli grow larger or become reduced in size by disturbance, and ultimately how they may be affected by future ocean conditions.…”

Section: Figmentioning

confidence: 98%

“…Nevertheless, photosynthesis and calcification in calcifying algae, in particular, play an important role in regulation of seawater carbonate chemistry (Kim et al. 2020) and in dissolved oxygen (DO), and induce dynamic fluctuations of inorganic carbon (DIC) in the coastal zone (Edwards et al. 2020).…”

Section: Figmentioning

confidence: 99%

“…Generally, changes in all components of DIC and total alkalinity ( A T ) are regulated, in part, by photosynthesis and calcification, respectively (Kim et al. 2018, 2020). These dynamics in seawater carbonate chemistry and DO, which are controlled by rhodolith metabolism, can have a great influence on the ecosystem‐level patterns (Cyronak et al.…”

Section: Figmentioning

confidence: 99%

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Variation in Photosynthetic Performance Relative to Thallus Microhabitat Heterogeneity in Lithothamnion australe (Rhodophyta, Corallinales) Rhodoliths

Kim

Steller

Edwards

2020

Journal of Phycology

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Rhodoliths are free‐living, coralline algae that create heterogeneous structure over sedimentary habitats. These fragile ecosystems are threatened by anthropogenic disturbances that reduce their size and three‐dimensional structural complexity. We investigated how physical disturbance from boat moorings affects photosynthetic performance in the rhodolith Lithothamnion australe. Photosynthetic parameters were measured for intact rhodoliths and crushed rhodolith fragments of two sizes (ca. 1 and 2 cm diameter), while chlorophyll fluorescence was measured at the surface of rhodoliths of these two sizes, between the interior branches of the larger rhodoliths, and at the surface of 52 various sized (0.4–3.5 cm diameter) rhodoliths. Gross productivity and net productivity were 15% and 36% higher, respectively, in the smaller L. australe, while respiration was 10% higher in the larger individuals. Thallus crushing reduced gross productivity by 20% and 41%, and net productivity by 9% and 14% in the smaller and larger rhodoliths, respectively. It also reduced respiration by 33% and 60% in the smaller and larger rhodoliths, respectively. Fluorescence parameters were all greater at the surface of the larger L. australe than the smaller individuals, and greater at the surface than in the interior parts of the larger individuals. Across a range of rhodolith sizes, surface fluorescence parameters were at their maxima in 1.54 to 2.32 cm diameter individuals. These results show that L. australe’s complex structure creates heterogeneity in photosynthesis and respiration between their surface and interior parts and among rhodolith sizes. This information can help predict how rhodoliths may respond to disturbance and environmental stressors.

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Section: Discussionmentioning

confidence: 98%

Section: Figmentioning

confidence: 98%

Section: Figmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

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Variation in Photosynthetic Performance Relative to Thallus Microhabitat Heterogeneity in Lithothamnion australe (Rhodophyta, Corallinales) Rhodoliths

Kim

Steller

Edwards

2020

Journal of Phycology

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“…The only other visible autotrophs in these deforested areas were crustose coralline algae, which together with microalgae can elevate production following deforestation due to increased irradiances (Miller et al 2012). However, measuring productivity by crustose coralline algae requires different approaches (e.g., Kim et al 2020), and we were unable to include these in our model. Thus, while we recognize that compensatory production may make up for some of this lost production, we limit our inference to the lost contribution of fleshy macroalgae following deforestation.…”

Section: Discussionmentioning

confidence: 99%

Species-specific biomass drives macroalgal benthic primary production on temperate rocky reefs

Spector¹,

Edwards²

2020

ALGAE

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Temperate rocky reefs dominated by the giant kelp, Macrocystis pyrifera, support diverse assemblages of benthic macroalgae that provide a suite of ecosystem services, including high rates of primary production in aquatic ecosystems. These forests and the benthic macroalgae that inhabit them are facing both short-term losses and long-term declines throughout much of their range in the eastern Pacific Ocean. Here, we quantified patterns of benthic macroalgal biomass and irradiance on rocky reefs that had intact kelp forests and nearby reefs where the benthic macroalgae had been lost due to deforestation at three sites along the California, USA and Baja California, MEX coasts during the springs and summers of 2017 and 2018. We then modeled how the loss of macroalgae from these reefs impacted net benthic productivity using species-specific, mass-dependent rates of photosynthesis and respiration that we measured in the laboratory. Our results show that the macroalgal assemblages at these sites were dominated by a few species of stipitate kelps and fleshy red algae whose relative abundances were spatially and temporally variable, and which exhibited variable rates of photosynthesis and respiration. Together, our model estimates that the dominant macroalgae on these reefs contribute 15 to 4,300 mg C m-2 d-1 to net benthic primary production, and that this is driven primarily by a few dominant taxa that have large biomasses and high rates of photosynthesis and / or respiration. Consequently, we propose that the loss of these macroalgae results in the loss of an important contribution to primary production and overall ecosystem function.

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Future Responses of Marine Primary Producers to Environmental Changes

Gao¹,

Zhao²,

Beardall³

2022

Blue Planet, Red and Green Photosynthesis

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Global warming offsets the ecophysiological stress of ocean acidification on temperate crustose coralline algae

Cited by 31 publications

References 51 publications

Variation in Photosynthetic Performance Relative to Thallus Microhabitat Heterogeneity in Lithothamnion australe (Rhodophyta, Corallinales) Rhodoliths

Variation in Photosynthetic Performance Relative to Thallus Microhabitat Heterogeneity in Lithothamnion australe (Rhodophyta, Corallinales) Rhodoliths

Species-specific biomass drives macroalgal benthic primary production on temperate rocky reefs

Future Responses of Marine Primary Producers to Environmental Changes

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