Low algal growth despite high iron supply: A new study in Nature Geoscience uncovers a surprising link between West Antarctic Ice Sheet retreat and the growth of marine algae over the past 500,000 years. The team's findings suggest that global warming could potentially result in a reduced uptake of carbon dioxide in the Pacific sector of the Southern Ocean if the West Antarctic Ice Sheet, which is considered unstable, continues to shrink. 

Iron-rich sediments transported by icebergs from West Antarctica failed to support algae growth in the Southern Ocean, because the iron was highly “weathered” and not readily bioavailable to algae—thus reducing the ocean’s carbon dioxide uptake.

Detecting weak and low-frequency underwater sounds remains a major challenge for ocean monitoring, navigation, and marine exploration. 

A global study published in Frontiers of Biogeography reveals that zoantharians (marine hexacorals) are defying long-held views of marine biogeography. Despite the vast distance between the Atlantic and Indo-Pacific, research shows surprisingly narrow genetic and morphological divergence between zoantharians in these two oceans. As climate change impacts traditional stony corals, zoantharians are increasingly filling these ecological niches. A key highlight of this international research is the establishment of a global atlas for zoantharians to help us understand the future of marine ecosystems amid environmental change.

The highly abundant marine bacterial clade SAR11 has evolved to thrive with limited nutrient resources. However, when nutrient levels increase, SAR11 is often unable to cope. It continues to replicate DNA as it normally would when it divides, but the the cells never divide, causing them to enlarge and die.

Researchers from the Faculty of Sciences University of Lisbon collaborated on an international study that, for the first time, characterized the sounds emitted by the flying gurnard.

This study highlights an underwater world of sounds that can provide deeper insights into how marine ecosystems work.

The body conditions of polar bear (Ursus maritimus) populations around the Norwegian island of Svalbard have improved despite sea ice losses, according to research published in Scientific Reports...

New research from the Marine Biological Laboratory examines how a species of frog evolved a unique genetic system for determining sex. Published in PLOS Genetics, the study traces the evolutionary origins of the gene dm-w, which directs female development in Xenopus laevis frogs and descends from dmrt1, a gene involved in sexual differentiation in humans and many other vertebrates. By comparing gene function across species and sexes, the researchers show that duplicated versions of dmrt1 followed different evolutionary paths in males and females. This divergence allowed one gene copy to become nonessential in females, ultimately enabling the emergence of dm-w as a new master switch for sex determination. The work highlights how genetic function can shift dramatically depending on biological context and underscores the role of genetic “tipping points” in evolutionary change.

Researchers from Incheon National University have discovered that prolonged nutrient depletion can significantly increase toxin production in harmful marine algae even when growth appears stable. Although nutrient starvation reduced photosynthetic efficiency, toxin levels continued to rise, revealing a hidden risk phase of harmful algal blooms. The findings highlight the need for monitoring strategies that go beyond bloom size and consider cellular toxin dynamics to better protect seafood safety and public health.