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#mesophotic

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Public
Or M. Bialik

The #mesophotic environment is often invoked as a refuge for corals and #reefs in a warming world. But mesophotic corals are not the same as shallow water ones, and might be much more sensitive to #warming at depth.
nature.com/articles/s41467-023

NatureMesophotic coral bleaching associated with changes in thermocline depth - Nature CommunicationsRising global temperatures cause widespread bleaching of shallow coral reefs but mesophotic reefs at depths over 30 metres are thought to be sheltered by cooler waters. Here, at sites in the Chagos Archipelago, the authors show bleaching of corals at depths of 90 metres, which might be due to warm surface waters being pushed deeper by the ocean’s response to the Indian Ocean Dipole.
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Or M. Bialik

New paper!
We usually think of #sediment getting finer as we move away from the shore. But, when biogenic and oceanographic factors come into play in the #mesophotic zone, the patterns could be quite different.
I'm really happy with how this paper came out. It's a very holistic view of how sedimentary #facies are actually distributed, with #seafloor photography, acoustic imaging, sampling, quantitative thin section analysis, and #multivariant statistics.
link.springer.com/article/10.1

Public
Or M. Bialik

#WeekendReading: Sherman et al., on the growth styles and rates of #mesophotic #reefs in the Caribbean.
link.springer.com/article/10.1

SpringerLinkStyles and rates of mesophotic reef accretion on a Caribbean insular slope - Coral ReefsStructural framework is fundamental to the concept of a coral-algal reef. However, our current understanding of reef framework is based largely upon studies of relatively shallow systems that formed at water depths of less than 30 m. There is comparatively limited information on deeper, mesophotic reef frameworks. Short drill cores collected at depths of ~ 50 m on the steep insular slope of southwest Puerto Rico allow for documentation of the composition and accretion rates of mesophotic reef framework. Framework is dominated by platy agariciid corals (Agaricia spp.) and autochthonous micrite (automicrite) with calcareous algae, corallines and peyssonnelids, forming a secondary component. Conspicuously, well-lithified automicrite constitutes a major structural and volumetric component of the framework. It is composed of magnesian calcite and displays irregular clotted, peloidal and fenestral fabrics, consistent with in situ formation. Radiocarbon ages of corals and automicrite indicate that they have formed recently (< 4 ka) and coevally in their current setting over a period of relative environmental stability. The steep slope gradient and associated dynamic oceanographic conditions may allow for extensive automicrite formation. Mesophotic reef accretion is occurring on the steep slope, though at slow rates of ~ 0.3 m ka−1.
Public
Or M. Bialik

New paper!

With me and colb. from expedition #SO292. From the Queensland Plateau, we present to you - a new type of ( #Mesophotic ) #Halimeda #bioherm, one that possibly got its shape by #storms.

link.springer.com/article/10.1

SpringerLinkA new type of Halimeda bioherm on the Queensland Plateau, NE Australia - Coral ReefsMorphology, internal structure, and in situ facies distribution of mesophotic Halimeda bioherms from the Queensland Plateau (NE Australia) are presented based on hydroacoustic and oceanographic data, seafloor observations, and discrete sediment sampling carried out during RV SONNE cruise SO292 in 2022. Halimeda buildups consist of cone-like mounds up to 500 m in diameter and 3–10 m high, with gentle slopes (2°–5° on the top of Tregrosse Bank). Bioherms occur in water depths of 10–70 m, with most bioherm between 50 and 65 m. Their internal structure consists of aggrading low-amplitude reflections at the core of the bioherm interfingering with high-amplitude reflections to the flanks. Surface facies distribution displays one to four facies belts, from distal to proximal: Halimeda rudstone, Halimeda rudstone with living plants, Halimeda rudstone with coralgal debris, and coralgal boundstone (when present, occupied the top of the bioherms). It is proposed that the alternation of two key processes contributes to the formation of these bioherms: (1) in situ accumulation of Halimeda debris and (2) episodic dismantling of the mesophotic coralgal boundstone at the centre of the bioherm by severe storms. These storms may dismantle the mesophotic reef and export coralgal rubble to the flanks. Flanks may be recolonized by Halimeda during fair-weather periods. Due to their different geomorphic expressions, complex internal structure, and surficial facies distribution, we suggest that the buildups of the Queensland Plateau represent a new Halimeda bioherm morphotype, distinct from previously described bioherms on the adjacent Great Barrier Reef and elsewhere globally.
Public
Lukas VFN 🇪🇺

Research team discovers more than 50 potentially new #DeepSea species in one of the most unexplored areas of the planet, underwater mountains of the Salas y Gómez Ridge phys.org/news/2024-04-team-pot

"they also found one of the deepest #mesophotic #corals in the world, extending the distribution of this Polynesian fauna by several hundred kilometers... & fields of #sponges and corals, habitats that are considered vulnerable and in need of protection"

underwater photo of a long skinny fish with beautiful deep blue iridescence
Public
Lukas VFN 🇪🇺

Deep parts of Great Barrier Reef insulated from #GlobalWarming, for now phys.org/news/2024-04-deep-gre

Climate change impacts on #mesophotic regions of the #GreatBarrierReef: Jennifer McWhorter et al. pnas.org/doi/10.1073/pnas.2303

"separation between warm buoyant surface water and cooler deeper water can insulate #reefs from surface #HeatWaves, but this protection will be lost if global #warming exceeds 3°C above pre-industrial levels."

Underwater photos taken before and after bleaching in the northern Great Barrier Reef
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Claudia Balt Campanini

Time to re-introduce myself, I am a #marine #biologist & scientific diver.

PRESENT: Enrolled as a #PhD student in the Marine Zoology Lab of Polytechnic University of Marche (UNIVPM, Italy) under the supervision of Prof. Carlo Cerrano, aiming 2 investigate benthic communities with a focus on #mesophotic & #monitoring

FUTURE: wannabe mesophotic reef research & tec diver

Check out my website to discover more: sites.google.com/view/claudia-

Claudia laughing on a boat while holding a Remotely-Operated Vehicle (ROV)
Public
Lukas VFN 🇪🇺

#ClimateCrisis: Scientists discover deepest known evidence of #coral reef bleaching phys.org/news/2023-10-scientis

#Mesophotic #CoralBleaching associated with changes in #thermocline depth: Clara Diaz et al. nature.com/articles/s41467-023

"This is a huge surprise. Deeper #corals had always been thought of as being resilient to #ocean #warming, because the waters they inhabit are cooler than at the surface and were believed to remain relatively stable. However, that is clearly not the case"

underwater photo of a deep-sea coral reef
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Claudia Balt Campanini

Fresh personal website, check it out!
Projects and pics🪸🧬🤿🥼

While searching for a job/PhD, I realized I'm more likely to contact researchers that have a personal/lab website where I can find more info on their research lines, open positions, etc. That's why I decided to create my own (next time I want to try to make it with #QuartoPub)

sites.google.com/view/claudia-

#research#jobhunt#diving
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