Alan D. Foreman

bsky.app/profile/natg...

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Tightening the Sargassum belt - Nature Geoscience A belt of seaweed has formed across the tropical Atlantic nearly every year since 2011, despite reduction in its extent elsewhere. The causes of this growth are now coming into clearer focus.

⚒️ December editorial: Tightening the 𝘚𝘢𝘳𝘨𝘢𝘴𝘴𝘶𝘮 belt - on the content in this issue on the Great Atlantic 𝘚𝘢𝘳𝘨𝘢𝘴𝘴𝘶𝘮 Belt (in thread)

www.nature.com/articles/s41...

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Tightening the Sargassum belt - Nature Geoscience A belt of seaweed has formed across the tropical Atlantic nearly every year since 2011, despite reduction in its extent elsewhere. The causes of this growth are now coming into clearer focus.

Check out the new editorial in this month’s Nature Geoscience regarding our newest work on the causes of massive Sargassum blooms:

www.nature.com/articles/s41...

🧪🌊🪸

Cosmic dust reveals dynamic shifts in central Arctic sea-ice coverage over the past 30,000 years Arctic sea-ice loss affects biological productivity, sustenance in coastal communities, and geopolitics. Forecasting these impacts requires mechanistic understanding of how Arctic sea ice responds to ...

Huge paper for the Arctic Ocean published today in @science.org - a new 30,000 year history of Arctic Ocean sea-ice cover reconstructed from the accumulation of cosmic dust-derived helium-3! www.science.org/doi/10.1126/... (1/n)

The driver of Sargassum blooms in the Atlantic Ocean

See more details here:

www.mpic.de/5797784/sarg...

Equatorial upwelling of phosphorus drives Atlantic N2 fixation and Sargassum blooms - Nature Geoscience High near-surface nitrogen-fixation rates that promoted the recent growth of the Great Atlantic Sargassum Belt were tied to greater upwelling of phosphorus from the equatorial Atlantic, according to c...

Check out our latest work, led by Jon Jung, Ph.D. student in the @amglab.bsky.social at @mpic.de:

www.nature.com/articles/s41...

Here we show that the supply of excess phosphorous from accounts for the majority of observed Sargassum variability since 2011.

🌊 🧪 #Paleosky #CoralReefs

Next talk by Iliana Baums @ibaums.bsky.social on "Reconstructing historical population dynamics of corals"
@hifmb.de
@marumunibremen.bsky.social

Chris Voolstra @reefgenomics.bsky.social kicking off the 2nd day of the #SPP2299 "Meeting & Status Seminar 2025" with a Perspective Lecture on "The future of reefs and reefs of the future"

First Keynote at #SPP2299 "Meeting and Status Seminar 2025" by Andrea Grottoli @andreagrottoli.bsky.social on "Leveraging coral biology, technology, and research networks to save coral reefs" in Bremen

@marumunibremen.bsky.social

This paper sets the stage for paleo reconstructions of the Mediterranean N cycle - stay tuned for more from Tanja et al.

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Origins of the Nitrate 15N Depletion in the Mediterranean Sea Basin-wide depth profiles of nitrate δ15N and δ18O indicate a supply of low-δ15N N to the Mediterranean Sea Nitrate δ15N can be explained by modest rates of N2 fixation and/or anthropogenic N dep...

Another cool paper coming out of @amglab.bsky.social. Led by Tanja Wald, here we present basin-wide profiles of Mediterranean nitrate N/O isotopes, and show that this distribution can be explained by a combination of nitrogen fixation and anthropogenic nitrogen deposition: dx.doi.org/10.1029/2023...

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Nitrogen isotopes in tooth enamel record diet and trophic level enrichment: Results from a controlled feeding experiment Nitrogen isotope ratios (δ15N) are a well-established tool for investigating the dietary and trophic behavior of animals in terrestrial and marine foo…

www.sciencedirect.com/science/arti...

For more, check out this comprehensive work by @jenniferleichliter.bsky.social showing how well enamel records diet:

This study uses the methods we developed in the @amglab.bsky.social for measuring enamel-bound nitrogen isotopes to show that the geochemical makeup of Australopithecus teeth was not consistent with a meat-based diet.

Australopithecus at Sterkfontein did not consume substantial mammalian meat Incorporation of animal-based foods into early hominin diets has been hypothesized to be a major catalyst of many important evolutionary events, including brain expansion. However, direct evidence of ...

Check out this exciting application of N isotopes from colleagues Tina Lüdecke and Jen Leichliter (@jenniferleichliter.bsky.social) and others just out in Science: Australopithecus at Sterkfontein did not consume substantial mammalian meat www.science.org/doi/10.1126/...

New Paper Alert!
Check out a recently published study around on decadal oscillations in the world's largest oxygen-deficient zone. This research, by Nicolas Duprey from MPI for Chemistry, uses nitrogen isotopes in corals skeletons to understand natural climate variability of the Pacific ODZ.

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Severe cold-water bleaching of a deep-water reef underscores future challenges for Mesophotic Coral Ecosystems Elevated sea surface temperatures are causing an increase in coral bleaching events worldwide, and represent an existential threat to coral reefs. Ear…

Last, a set of observations detailing a massive cold-bleaching and mortality event of mesophotic reefs that we observed in 2023 onboard S/Y Acadia at Clipperton Atoll in the Eastern Tropical Pacific:

www.sciencedirect.com/science/arti...

Decadal oscillations in the ocean’s largest oxygen-deficient zone The impact of global warming on the ocean’s oxygen-deficient zones (ODZs) is uncertain, partly because of a lack of data on past changes. We report monthly resolved records of coral skeleton–bound nit...

Hot off the (e-)press, a study in Science led by Nic Duprey showing that the variability of the world's largest Oxygen Deficient Zone over the last 80 years is tightly linked to Pacific Decadal Variability: www.science.org/doi/10.1126/...

Coral photosymbiosis on Mid-Devonian reefs - Nature Nitrogen isotope evidence of Mid-Devonian photosymbiotic associations in certain types of corals suggests that autotrophic and heterotrophic corals co-existed on extinct reefs, as today, but in w...

We've had a couple cool things come out of the lab lately, and I wanted to share. First, check out this paper from Jon Jung et al. in Nature showing geochemical evidence for coral symbiosis on Devonian reefs: www.nature.com/articles/s41...