Species-specific consequences of ocean acidification for the calcareous tropical green algae Halimeda

Price, Nichole N.; Hamilton, Scott L.; Tootell, Jesse S.; Smith, Jennifer E.

doi:10.3354/meps09309

Cited by 100 publications

(86 citation statements)

References 58 publications

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“…Although morphologically similar to H. incrassata, primary inter-utricle spaces in H. monile were heavily cemented with micro-anhedral crystals and aragonite needles were virtually absent. The present study revealed ultra-and micro-structural distinctions among species that have been suggested to cause mixed responses of Halimeda species to OA (Price et al 2011, Comeau et al 2013, Campbell et al 2014. Species of the Opuntia lineage have been shown in several multi-species investigations to be more susceptible to OA relative to species of other lineages, including Halimeda and Rhipsalis.…”

Section: Discussionmentioning

confidence: 87%

“…Species of the Opuntia lineage have been shown in several multi-species investigations to be more susceptible to OA relative to species of other lineages, including Halimeda and Rhipsalis. For example, Price et al (2011) found that H. opuntia (Opuntia lineage) exhibited a more negative calcification response to elevated pCO 2 when compared to H. taenicola, a less calcified species of the Halimeda lineage with larger utricles. Campbell et al (2014Campbell et al ( , 2015 also found that exposure to elevated pCO 2 led to significant reductions in net calcification for H. opuntia, in contrast to H. incrassata, a less calcified species of the Rhipsalis lineage whose net calcification rates were unaffected.…”

Section: Discussionmentioning

confidence: 99%

“…Filament morphology has been proposed to be a factor contributing to species-specific responses within the tropical calcifying macroalgal genus Halimeda to ocean acidification (OA) (Price et al 2011, Comeau et al 2013, Campbell et al 2014. Halimeda thalli are composed of coenocytic (multi-nucleate) filaments that swell at their termini, resulting in the adherence of filament tips ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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Primary utricle structure of six Halimeda species and potential relevance for ocean acidification tolerance

et al. 2017

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Abstract:Variations in utricle morphology may be responsible for different tolerances to ocean acidification (OA) within the macroalgal genus Halimeda, an important sediment producer on reefs. However, differences in species' utricle morphology and their relationship to calcification and crystal formation have not been well articulated. In the present study, we characterized the utricle morphologies of six Halimeda species. Primary utricle ultrastructure was quantitatively and qualitatively compared to tissue inorganic content and crystal microstructure. Morphologies differed across species and several morphometric relationships were revealed. Primary utricle size (r 2 = 0.70) and diffusion pathway length (r 2 = 0.87) had inverse relationships with inorganic content based on regression analyses, and corresponded to crystal microstructure form. Species with large utricles and long diffusion pathways contained more narrow (~ 0.15 μm) aragonite needles and minimal micro-anhedral crystal formations. In contrast, species with small utricles and short diffusion pathways elucidated aggregates of micro-anhedral crystals and wider aragonite needles (~ 0.30 μm). Species' utricle characteristics generally corresponded to specific evolutionary lineages. Thus, characteristics of Halimeda utricle morphology may control long-term adaptive responses to OA, an idea articulated in the broader literature.

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Primary utricle structure of six Halimeda species and potential relevance for ocean acidification tolerance

et al. 2017

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“…also arrived at varying conclusions, with some suggesting that growth and calcification of several Halimeda spp. may be impacted under future CO 2 conditions (Price et al 2011;Ries et al 2009;Sinutok et al 2011), while others suggest that several others are unlikely to be impacted by OA alone (Comeau et al 2013;Hofmann et al 2014;N. Vogel et al pers.…”

Section: Discussionmentioning

confidence: 99%

“…were absent at mean X ar 2.5 (HallSpencer et al 2008). Laboratory experiments revealed mixed responses of OA on Halimeda spp., with some species being negatively impacted, while others are not (Hofmann et al 2014;Koch et al 2013;Price et al 2011;Ries et al 2009;Sinutok et al 2011;N. Vogel et al pers.…”

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confidence: 99%

Calcareous green alga H alimeda tolerates ocean acidification conditions at tropical carbon dioxide seeps

et al. 2015

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We investigated ecological, physiological, and skeletal characteristics of the calcifying green alga Halimeda grown at CO 2 seeps (pH total 7.8) and compared them to those at control reefs with ambient CO 2 conditions (pH total 8.1). Six species of Halimeda were recorded at both the high CO 2 and control sites. For the two most abundant species Halimeda digitata and Halimeda opuntia we determined in situ light and dark oxygen fluxes and calcification rates, carbon contents and stable isotope signatures. In both species, rates of calcification in the light increased at the high CO 2 site compared to controls (131% and 41%, respectively). In the dark, calcification was not affected by elevated CO 2 in H. digitata, whereas it was reduced by 167% in H. opuntia, suggesting nocturnal decalcification. Calculated net calcification of both species was similar between seep and control sites, i.e., the observed increased calcification in light compensated for reduced dark calcification. However, inorganic carbon content increased (22%) in H. digitata and decreased (28%) in H. opuntia at the seep site compared to controls. Significantly, lighter carbon isotope signatures of H. digitata and H. opuntia phylloids at high CO 2 (1.01& [parts per thousand] and 1.94&, respectively) indicate increased photosynthetic uptake of CO 2 over HCO 3 2 potentially reducing dissolved inorganic carbon limitation at the seep site. Moreover, H. digitata and H. opuntia specimens transplanted for 14 d from the control to the seep site exhibited similar d 13 C signatures as specimens grown there. These results suggest that the Halimeda spp. investigated can acclimatize and will likely still be capable to grow and calcify in P CO 2 conditions exceeding most pessimistic future CO 2 projections.

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Influence of post‐Tehuano oceanographic processes in the dynamics of the CO₂ system in the Gulf of Tehuantepec, Mexico

et al. 2015

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This investigation reports, for the first time, results of CO2 system variables in the Gulf of Tehuantepec, located in the Mexican tropical Pacific. We quantified the post‐Tehuano concentration of dissolved inorganic carbon (DIC) and pH (April 2013). These values were used to calculate pCO2, aragonite saturation (ΩAr), and air‐sea CO2 fluxes (FCO2). The intense vertical stratification was found to contribute to the biogeochemical processes in surface waters (<70 m). However, in post‐Tehuano conditions, high pCO2 (∼1000 µatm) and DIC concentrations (2200 µmol kg−1), as well as low ΩAr (∼1.1) and pH (∼7.5), remain in surface waters for a few days after Tehuano winds have weakened. We identified four oceanographic areas: (a) a highly mixed region due to previous Tehuano events; (b) coastal upwelling in the western region; (c) mesoscale eddies; (d) a poleward surface coastal current. The first three promoted the influence of Subtropical Subsurface Water in the chemistry of surface waters, whereas the coastal current contributed to the horizontal advection of DIC. The calculated CO2 fluxes ranged from −2.3 mmol m−2 d−1 in areas with stratified waters to over 25 mmol m−2 d−1 for mixed areas. Positive values indicate an ocean‐to‐atmosphere flux. Our findings suggest that the Gulf of Tehuantepec is a major source of CO2 into the atmosphere.

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Species-specific consequences of ocean acidification for the calcareous tropical green algae Halimeda

Cited by 100 publications

References 58 publications

Primary utricle structure of six Halimeda species and potential relevance for ocean acidification tolerance

Primary utricle structure of six Halimeda species and potential relevance for ocean acidification tolerance

Calcareous green alga H alimeda tolerates ocean acidification conditions at tropical carbon dioxide seeps

Influence of post‐Tehuano oceanographic processes in the dynamics of the CO₂ system in the Gulf of Tehuantepec, Mexico

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Species-specific consequences of ocean acidification for the calcareous tropical green algae Halimeda

Cited by 100 publications

References 58 publications

Primary utricle structure of six Halimeda species and potential relevance for ocean acidification tolerance

Primary utricle structure of six Halimeda species and potential relevance for ocean acidification tolerance

Calcareous green alga H alimeda tolerates ocean acidification conditions at tropical carbon dioxide seeps

Influence of post‐Tehuano oceanographic processes in the dynamics of the CO2 system in the Gulf of Tehuantepec, Mexico

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Influence of post‐Tehuano oceanographic processes in the dynamics of the CO₂ system in the Gulf of Tehuantepec, Mexico