Physiological responses to temperature and ocean acidification in tropical fleshy macroalgae with varying affinities for inorganic carbon

Ho, Maureen; McBroom, James; Bergstrom, Ellie; Díaz-Pulido, Guillermo

doi:10.1093/icesjms/fsaa195

Cited by 12 publications

(13 citation statements)

References 56 publications

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“…A more prominent heat stress effects on growth rates than on photosynthesis was also reported in other tropical species (Sinutok et al, 2012;Terada et al, 2016), including P. acuta, and T. hemprichii (George et al, 2018;Poquita-Du et al, 2020;Ho et al, 2021). This implies that the general notion that photosynthesis is one of the most sensitive physiological processes (Bhagooli et al, 2021) and that its response may precede the response at growth level may not entirely hold true for heat stress or could not be supported by the chlorophyll fluorescence parameters measured in the present study.…”

Section: Effects Of Warming On Overall Performance Of Shallow-water Marine Organismscontrasting

confidence: 59%

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

et al. 2021

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Tropical shallow-water habitats represent the marine environments with the greatest biodiversity; however, these habitats are the most vulnerable to climate warming. Corals, seagrasses, and macroalgae play a crucial role in the structure, functions, and processes of the coastal ecosystems. Understanding their growth and physiological responses to elevated temperature and interspecific sensitivity is a necessary step to predict the fate of future coastal community. Six species representatives, including Pocillopora acuta, Porites lutea, Halophila ovalis, Thalassia hemprichii, Padina boryana, and Ulva intestinalis, collected from Phuket, Thailand, were subjected to stress manipulation for 5 days. Corals were tested at 27, 29.5, 32, and 34.5°C, while seagrasses and macroalgae were tested at 27, 32, 37, and 42°C. After the stress period, the species were allowed to recover for 5 days at 27°C for corals and 32°C for seagrasses and macroalgae. Non-destructive evaluation of photosynthetic parameters (Fv/Fm, Fv/F0, ϕPSII and rapid light curves) was carried out on days 0, 3, 5, 6, 8, and 10. Chlorophyll contents and growth rates were quantified at the end of stress, and recovery periods. An integrated biomarker response (IBR) approach was adopted to integrate the candidate responses (Fv/Fm, chlorophyll content, and growth rate) and quantify the overall temperature effects. Elevated temperatures were found to affect photosynthesis, chlorophyll content, and growth rates of all species. Lethal effects were detected at 34.5°C in corals, whereas adverse but recoverable effects were detected at 32°C. Seagrasses and macroalgae displayed a rapid decline in photosynthesis and lethal effects at 42°C. In some species, sublethal stress manifested as slower growth and lower chlorophyll content at 37°C, while photosynthesis remained unaffected. Among all, T. hemprichii displayed the highest thermotolerance. IBR provided evidence that elevated temperature affected the overall performance of all tested species, depending on temperature level. Our findings show a sensitivity that differs among important groups of tropical marine organisms inhabiting the same shallow-water environments and highlights the importance of integrating biomarkers across biological levels to assess their vulnerability to climate warming.

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Section: Effects Of Warming On Overall Performance Of Shallow-water Marine Organismscontrasting

confidence: 59%

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

et al. 2021

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“…Climate change threats to coral reef ecosystems include warming and ocean acidification, both of which are predicted to significantly degrade coral reefs around the globe in the coming decades (IPCC, 2022). Field and labbased studies have focused on the response of individual noncoral sessile groups to changes in temperature and pH, including sponges (Bell et al, 2018), ascidians (Peck et al, 2015), crustose coralline algae (CCA) (Kroeker et al, 2013;Cornwall et al, 2020), bryozoans (Pecquet et al, 2017), soft corals (Lopes et al, 2018), and fleshy encrusting macroalgae (Diaz-Pulido and Barroń, 2020;Ho et al, 2021). With newly developed methods furthering our ability to record in situ biogeochemical fluxes across benthic reef communities (Roth et al, 2019), studies are now needed to determine how cryptobenthic communities as a whole respond to combined stressors.…”

Section: Introductionmentioning

confidence: 99%

Remote reef cryptobenthic diversity: Integrating autonomous reef monitoring structures and in situ environmental parameters

Steyaert

Lindhart²,

Khrizman³

et al. 2022

Front. Mar. Sci.

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Coral reef sessile organisms inhabiting cryptic spaces and cavities of the reef matrix perform vital and varied functional roles but are often understudied in comparison to those on exposed surfaces. Here, we assess the composition of cryptobenthic taxa from three remote tropical reef sites (Central Indian Ocean) alongside a suite of in situ environmental parameters to determine if, or how, significant patterns of diversity are shaped by local abiotic factors. To achieve this, we carried out a point-count analysis of autonomous reef monitoring structure (ARMS) plate images and employed in situ instrumentation to recover long-term (12 months) profiles of flow velocity, wave heights, temperature, dissolved oxygen, and salinity, and short-term (3 weeks) profiles of light and pH. We recovered distinct environmental profiles between sampling sites and observed that ocean-facing reefs experienced frequent but short-lived cooling internal wave events and that these were key in shaping in situ temperature variability. By comparing temperature and wave height profiles recovered using in situ loggers with ex situ models, we discovered that global satellite products either failed to recover site-specific profiles or both over- and underestimated actual in situ conditions. We found that site choice and recruitment plate face (top or bottom) significantly impacted the percentage cover of bryozoans, gastropods, soft and calcified tube worms, as well as crustose coralline algae (CCA) and fleshy red, brown, and green encrusting macroalgae on ARMS. We observed significant correlations between the abundance of bryozoans, CCA, and colonial tunicates with lower mean temperature and higher mean dissolved oxygen profiles observed across sites. Red and brown encrusting macroalgae abundance correlated significantly with medium-to-high flow velocities and wave height profiles, as well as higher pH and dissolved oxygen. This study provides the first insight into cryptobenthic communities in the Chagos Archipelago marine-protected area and adds to our limited understanding of tropical reef sessile communities and their associations with environmental parameters in this region. With climate change accelerating the decline of reef ecosystems, integrating analyses of cryptobenthic organisms and in situ physicochemical factors are needed to understand how reef communities, if any, may withstand the impacts of climate change.

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“…While the lack of macroalgae in the model may still be representative of reefs where herbivores are abundant, the outcome of competition under OA may be different on reefs that lack adequate herbivory. Indeed, some macroalgae can benefit from increases in CO 2 and/or HCO -3 under OA (Koch et al, 2013;Diaz-Pulido & Barrón, 2020;Ho et al, 2021), enhancing the competitive ability of macroalgae versus corals, and possibly increasing macroalgal dominance on reefs under OA (Anthony et al, 2011;Diaz-Pulido et al, 2011;Johnson et al, 2012). As such, it is important for future studies to build on the present approach with more sophisticated models (i.e., that may include macroalgal dynamics where applicable) that can be developed as suitable empirical data become available.…”

Section: Discussionmentioning

confidence: 99%

Scaling the effects of ocean acidification on coral growth and coral–coral competition on coral community recovery

Evensen

Bozec

Edmunds

et al. 2021

PeerJ

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Ocean acidification (OA) is negatively affecting calcification in a wide variety of marine organisms. These effects are acute for many tropical scleractinian corals under short-term experimental conditions, but it is unclear how these effects interact with ecological processes, such as competition for space, to impact coral communities over multiple years. This study sought to test the use of individual-based models (IBMs) as a tool to scale up the effects of OA recorded in short-term studies to community-scale impacts, combining data from field surveys and mesocosm experiments to parameterize an IBM of coral community recovery on the fore reef of Moorea, French Polynesia. Focusing on the dominant coral genera from the fore reef, Pocillopora, Acropora, Montipora and Porites, model efficacy first was evaluated through the comparison of simulated and empirical dynamics from 2010–2016, when the reef was recovering from sequential acute disturbances (a crown-of-thorns seastar outbreak followed by a cyclone) that reduced coral cover to ~0% by 2010. The model then was used to evaluate how the effects of OA (1,100–1,200 µatm pCO2) on coral growth and competition among corals affected recovery rates (as assessed by changes in % cover y−1) of each coral population between 2010–2016. The model indicated that recovery rates for the fore reef community was halved by OA over 7 years, with cover increasing at 11% y−1 under ambient conditions and 4.8% y−1 under OA conditions. However, when OA was implemented to affect coral growth and not competition among corals, coral community recovery increased to 7.2% y−1, highlighting mechanisms other than growth suppression (i.e., competition), through which OA can impact recovery. Our study reveals the potential for IBMs to assess the impacts of OA on coral communities at temporal and spatial scales beyond the capabilities of experimental studies, but this potential will not be realized unless empirical analyses address a wider variety of response variables representing ecological, physiological and functional domains.

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Physiological responses to temperature and ocean acidification in tropical fleshy macroalgae with varying affinities for inorganic carbon

Cited by 12 publications

References 56 publications

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

Remote reef cryptobenthic diversity: Integrating autonomous reef monitoring structures and in situ environmental parameters

Scaling the effects of ocean acidification on coral growth and coral–coral competition on coral community recovery

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