Orbital and Suborbital‐Scale Variations of Productivity and Sea Surface Conditions in the Gulf of Alaska During the Past 54,000 Years: Impact of Iron Fertilization by Icebergs and Meltwater

Romero, Oscar E; LeVay, Leah J.; McClymont, Erin L.; Müller, Juliane; Cowan, Ellen A.

doi:10.1029/2021pa004385

Cited by 13 publications

(10 citation statements)

References 75 publications

(214 reference statements)

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“…The regime of abundant micro‐nutrients and low macro‐nutrients known as LNHC characterizes the modern coastal Alaska (Weingartner, 2007). The source of micro‐nutrients during the Pliocene could be from two terrestrial sources: glacial flour and/or aeolian dust (Müller et al., 2018; Romero et al., 2022). Iron‐rich glacial flour is abundant in modern coastal Alaska estuaries for example, the Copper River (Crusius et al., 2011) and the continental margin (Lam & Bishop, 2008).…”

Section: Discussionmentioning

confidence: 99%

Plio‐Pleistocene Ocean Circulation Changes in the Gulf of Alaska and Its Impacts on the Carbon and Nitrogen Cycles and the Cordilleran Ice Sheet Development

Sánchez-Montes

Romero

Cowan

et al. 2022

Paleoceanog and Paleoclimatol

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Section: Discussionmentioning

confidence: 99%

Plio‐Pleistocene Ocean Circulation Changes in the Gulf of Alaska and Its Impacts on the Carbon and Nitrogen Cycles and the Cordilleran Ice Sheet Development

Sánchez-Montes

Romero

Cowan

et al. 2022

Paleoceanog and Paleoclimatol

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“…Seawater nutrient concentrations were not manipulated, and thus reflected what was delivered through source water inflow to the system during each experiment. Due to the complex controls of nutrient flux onto the Northeast Pacific shelves, there is little consensus on how seasonal nutrient supply in Sitka Sound may change in the future (Hermann et al, 2009; Hood & Scott, 2008; Jenckes et al, 2022; Romero et al, 2022). Therefore, we chose to assume that nutrient availability, like seasonal light availability, would not differ significantly in this region in the future.…”

Section: Methodsmentioning

confidence: 99%

Season influences interspecific responses of canopy‐forming kelps to future warming and acidification at high latitude

Bell,

Westphal,

O'Brien

et al. 2024

Ecosphere

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Variability in primary producers' responses to environmental change may buffer higher trophic levels against shifts in basal resource composition. Then again, in instances where there is a lack of functional redundancy because consumers rely on a few species to meet their energetic requirements at specific times of the year, altered community production dynamics may significantly impact food web resilience. In high‐latitude kelp forests, a complementary annual phenology of seaweed production supports coastal marine consumers' metabolic needs across large seasonal variations in their environment. Yet, marine consumers in these systems may face significant metabolic stress under the pronounced low pH conditions expected in future winters, particularly if they lack the resources to support their increased energetic demands. In this study, we investigate how the growth and nutritional value of three dominant, coexisting macroalgal species found in subpolar kelp forests will respond to ocean acidification and warming in future winter and summer seasons. We find that the three kelps Macrocystis pyrifera, Hedophyllum nigripes, and Neoagarum fimbriatum differ in their vulnerability to future environmental conditions, and that the seasonal environmental context of nutrient and light availability shapes these responses. Our results suggest that poleward fringe populations of M. pyrifera may be relatively resilient to anticipated ocean warming and acidification. In contrast, ocean warming conditions caused a decrease in the biomass and nutritional quality of both understory kelps. Considering the unique production phenology of H. nigripes, we emphasize that negative impacts on this species in future winters may be of consequence to consumer energetics in this system. This work highlights how interspecific variation in autotrophs' responses to global change can disrupt the diversity and phenological structure of energy supply available to higher trophic levels.

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“…The unusually high %C 37:4 observed in high-latitude oceans can be attributed to alkenone production by Group 2i during thawing of sea-ice which generally coincide with low surface salinity 3 . Cells and DNA sequences of Group 2i has been widely observed within sea ice 3 , and the correlation between occurrence of Group 2i and high %C 37:4 has been used to reconstruct past changes in sea ice in regions such as the Gulf of Alaska and the Fram Strait 3 , 15 , 16 . However, we have a limited understanding of the global distribution and ecology of Group 2i Isochrysidales in the natural environments.…”

Section: Introductionmentioning

confidence: 99%

Group 2i Isochrysidales thrive in marine and lacustrine systems with ice cover

Wang,

Huang,

Kartzinel

et al. 2024

Sci Rep

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Global warming is causing rapid changes to the cryosphere. Predicting the future trajectory of the cryosphere requires quantitative reconstruction of its past variations. A recently identified sea-ice-associated haptophyte, known as Group 2i Isochrysidales, has given rise to a new sea-ice proxy with its characteristic alkenone distributions. However, apart from the occurrence of Group 2i Isochrysidales in regions with sea ice, and the empirical relationship between C37:4 alkenone abundance and sea-ice concentration, little is known about the ecology of these haptophyte species. Here, we systematically mapped the spatial and temporal occurrence of known Group 2i Isochrysidales based on environmental DNA in both marine and lacustrine environments. Our results indicate Group 2i is widely distributed in icy marine and lacustrine environments in both Northern and Southern Hemisphere, but is absent in warm environments. Temporally, Group 2i is part of the sea-ice algae bloom during the cold seasons, in contrast to other Isochrysidales that bloom in open waters during warm seasons. Our results indicate that ice is a prerequisite for the occurrence of the psychrophilic Group 2i haptophytes in marine and lacustrine ecosystems and further affirms its value for past ice reconstructions.

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Orbital and Suborbital‐Scale Variations of Productivity and Sea Surface Conditions in the Gulf of Alaska During the Past 54,000 Years: Impact of Iron Fertilization by Icebergs and Meltwater

Cited by 13 publications

References 75 publications

Plio‐Pleistocene Ocean Circulation Changes in the Gulf of Alaska and Its Impacts on the Carbon and Nitrogen Cycles and the Cordilleran Ice Sheet Development

Plio‐Pleistocene Ocean Circulation Changes in the Gulf of Alaska and Its Impacts on the Carbon and Nitrogen Cycles and the Cordilleran Ice Sheet Development

Season influences interspecific responses of canopy‐forming kelps to future warming and acidification at high latitude

Group 2i Isochrysidales thrive in marine and lacustrine systems with ice cover

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