Compensation of ocean acidification effects in Arctic phytoplankton assemblages

Hoppe, Clara Jule Marie; Wolf, Klara; Schuback, Nina; Tortell, Philippe D.; Rost, Björn

doi:10.1038/s41558-018-0142-9

Cited by 65 publications

(65 citation statements)

References 58 publications

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“…In this study, two of three strains from each of the two isolation backgrounds of the preceding natural community incubation grew faster in the treatment most resembling their origin (i.e., strains A, B, C from the present-day vs. strains X, Y, Z from future conditions; Figure 1b). Still, since six strains are a small sample size compared to the natural standing diversity and as the responses are not uniform, this cannot clearly support or falsify the idea of intraspecific sorting in the community incubation as hypothesized in Hoppe, Wolf, et al (2018). This is only partly consistent with expected strain sorting according to abiotic conditions within the natural community incubation prior to isolation.…”

Section: Wide and Diverse Temperature And Co 2 Niches Within The Samentioning

confidence: 79%

“…This is only partly consistent with expected strain sorting according to abiotic conditions within the natural community incubation prior to isolation. Still, since six strains are a small sample size compared to the natural standing diversity and as the responses are not uniform, this cannot clearly support or falsify the idea of intraspecific sorting in the community incubation as hypothesized in Hoppe, Wolf, et al (2018).…”

Section: Wide and Diverse Temperature And Co 2 Niches Within The Samentioning

confidence: 90%

“…The community incubation was conducted in April 2016 by applying combined pCO 2 and temperature treatments under controlled light and nutrient conditions in a laboratory. The details of this experiment can be found in Hoppe, Wolf, Schuback, Tortell, and Rost (2018), where the experiment is referred to as KFb.…”

Section: Strain Origin and Isolationmentioning

confidence: 99%

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Company matters: The presence of other genotypes alters traits and intraspecific selection in an Arctic diatom under climate change

Wolf

Romanelli

Rost

et al. 2019

Global Change Biology

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Arctic phytoplankton and their response to future conditions shape one of the most rapidly changing ecosystems on the planet. We tested how much the phenotypic responses of strains from the same Arctic diatom population diverge and whether the physiology and intraspecific composition of multistrain populations differs from expectations based on single strain traits. To this end, we conducted incubation experiments with the diatom Thalassiosira hyalina under present‐day and future temperature and pCO2 treatments. Six fresh isolates from the same Svalbard population were incubated as mono‐ and multistrain cultures. For the first time, we were able to closely follow intraspecific selection within an artificial population using microsatellites and allele‐specific quantitative PCR. Our results showed not only that there is substantial variation in how strains of the same species cope with the tested environments but also that changes in genotype composition, production rates, and cellular quotas in the multistrain cultures are not predictable from monoculture performance. Nevertheless, the physiological responses as well as strain composition of the artificial populations were highly reproducible within each environment. Interestingly, we only detected significant strain sorting in those populations exposed to the future treatment. This study illustrates that the genetic composition of populations can change on very short timescales through selection from the intraspecific standing stock, indicating the potential for rapid population level adaptation to climate change. We further show that individuals adjust their phenotype not only in response to their physicochemical but also to their biological surroundings. Such intraspecific interactions need to be understood in order to realistically predict ecosystem responses to global change.

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Section: Wide and Diverse Temperature And Co 2 Niches Within The Samentioning

confidence: 79%

Section: Wide and Diverse Temperature And Co 2 Niches Within The Samentioning

confidence: 90%

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Company matters: The presence of other genotypes alters traits and intraspecific selection in an Arctic diatom under climate change

Wolf

Romanelli

Rost

et al. 2019

Global Change Biology

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“…It is expected that the decrease in pH in the surface of the ocean will be as great as 0.2 to 0.4 units by the end of this century (Caldeira & Wickett, ; Stocker, ). Over the last decade, relatively extensive laboratory and field investigations of marine primary producers (e.g., Trichodesmium, picoplankton, and diatoms) and calcifying organisms (e.g., corals, molluscs, and coccolithophores) have shown the sensitivity of many ecologically and biogeochemically important organisms to high p CO 2 levels (Beaufort et al, ; Hall‐Spencer et al, ; Hoegh‐Guldberg et al, ; Hofmann et al, ; Hong et al, ; Hoppe et al, ; Hutchins et al, ; Newbold et al, ; Riebesell et al, ; Rodolfo‐Metalpa et al, ; Shi et al, ; Tatters et al, ).…”

Section: Introductionmentioning

confidence: 99%

Ocean Acidification Regulates the Activity, Community Structure, and Functional Potential of Heterotrophic Bacterioplankton in an Oligotrophic Gyre

et al. 2019

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Ocean acidification (OA), a consequence of increased global carbon dioxide (CO 2 ) emissions, is considered a major threat to marine ecosystems. Its effects on bacterioplankton activity, diversity, and community composition have received considerable attention. However, the direct impact of OA on heterotrophic bacterioplankton is often masked by the significant response of phytoplankton due to the close coupling of heterotrophic bacterioplankton and autotrophs. Here we investigated the responses of a heterotrophic bacterioplankton assemblage to high pCO 2 (790-ppm) treatment in warm tropical western Pacific waters by conducting a microcosm experiment in dark for 12 days. Heterotrophic bacterioplankton abundance and production were enhanced by OA over the first 6 days of incubation, while the diversity and species richness were negatively affected. Bacterioplankton community composition in the high pCO 2 treatment changed faster than that in the control. The molecular ecological network analysis showed that the elevated CO 2 changed the overall connections among the bacterial community and resulted in a simple network under high CO 2 condition. Species-specific responses to OA were observed and could be attributed to the different life strategies and to the ability of a given species to adapt to environmental conditions. In addition, high-throughput functional gene array analysis revealed that genes related to carbon and nitrogen cycling were positively affected by acidification. Together, our findings suggest that OA has direct effects on heterotrophic bacterioplankton in a low-latitude warm ocean and may therefore affect global biogeochemical cycles.

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“…Early work on ocean acidification suggested the ballast effect is at risk from ocean acidification weakening phytoplankton calcification rates (Riebesell et al, 2000); however, these concerns have since been reduced by studies demon-strating net increases in calcification and primary production with increasing pCO 2 (Iglesias-Rodriguez et al, 2008), adaptability of phytoplankton calcifiers to acidified conditions (Lohbeck et al, 2012;Liu et al, 2018), adaptability of primary producer assemblages to acidification (Hoppe et al, 2018), and field evidence of historical increases in calcification over the past 200 years (Iglesias-Rodriguez et al, 2008). Looking into the geological record, coccolithophores were more robust (Bolton et al, 2016) and more ubiquitous in warmer, more acidic oceans of the past (Hannisdal et al, 2012).…”

mentioning

confidence: 99%

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Kvale¹

2019

Preprint

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Phytoplankton calcifiers contribute to global carbon cycling through their dual formation of calcium carbonate and particulate organic carbon (POC). The carbonate might provide an efficient export pathway for the associated POC to the deep ocean, reducing the particles' exposure to biological degradation in the upper ocean and increasing the particle settling rate. Previous work has suggested ballasting of POC by carbonate might increase in a warming climate, in spite of increasing carbonate dissolution rates, because calcifiers benefit from the widespread nutrient limitation arising from stratification. We compare the biogeochemical responses of three models containing (1) a single mixed phytoplankton class, (2) additional explicit small phytoplankton and calcifiers, and (3) additional explicit small phytoplankton and calcifiers with a prognostic carbonate ballast model, to two rapid changes in atmospheric CO 2 . The first CO 2 scenario represents a rapid (151-year) transition from a stable icehouse climate (283.9 ppm) into a greenhouse climate (1263 ppm); the second represents a symmetric rapid transition from a stable greenhouse climate into an icehouse climate. We identify a slope change in the global net primary production response with a transition point at about 3.5 • C global mean sea surface temperature change in all models, driven by a combination of physical and biological changes. We also find that in both warming and cooling scenarios, the application of a prognostic carbonate ballast model moderates changes in carbon export production, suboxic volume, and nitrate sources and sinks, reducing the long-term model response to about one-third that of the cal-

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Compensation of ocean acidification effects in Arctic phytoplankton assemblages

Cited by 65 publications

References 58 publications

Company matters: The presence of other genotypes alters traits and intraspecific selection in an Arctic diatom under climate change

Company matters: The presence of other genotypes alters traits and intraspecific selection in an Arctic diatom under climate change

Ocean Acidification Regulates the Activity, Community Structure, and Functional Potential of Heterotrophic Bacterioplankton in an Oligotrophic Gyre

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