Long believed to be a single, globally distributed species drifting freely across the open ocean, the bluebottle – also known as the Portuguese man o’ war – has now been revealed to be a group of at least four distinct species, each with its own unique morphology, genetics, and distribution.

In a recent study, researchers have discovered that the genes related on extracellular matrix (ECM) and the Wnt signaling pathway characterize the independently acquired lip hypertrophy in cichlids of East African Great Lakes. Through advanced omics-based experiments and comparative histological analyses, they found that hypertrophied lips of cichlids had a larger proteoglycan-rich layer. This study provides vital insights into the evolutionary biology of lip hypertrophy in cichlids of East African Great Lakes.

Currently, the main method of combatting CoTS outbreaks is by manually culling each starfish one-by-one, which is highly inefficient, labor-intensive, and costly. But now, a team of researchers from the Australian Institute of Marine Science (AIMS), the University of the Sunshine Coast in Australia, and the Okinawa Institute of Science and Technology (OIST) in Japan have discovered that CoTS use their characteristic spines to ‘smell’ peptides and communicate with one another, even outside mating seasons. Building on this finding, the team has created a synthetic peptide that consistently attracts CoTS at very low concentrations and with no toxicity. The results are published in iScience. Their discovery could lead to the further development of potent pest-management peptides – dubbed Acanthaster attractins – that prompts the starfish to congregate at one spot, enabling the efficient removal of many CoTS in one sweep.

Researchers of the University of Groningen and the Carl von Ossietzky Universität Oldenburg studied population trends across 3,058 populations of various species throughout the entire Wadden Sea. Twenty-four per cent of the populations showed a significant decline in size, and this trend is occurring simultaneously across various groups. Only fourteen per cent of the populations showed an increase in size.

New research reveals the importance of winter sea ice in the year-to-year variability of the amount of atmospheric CO₂ absorbed by a region of the Southern Ocean.

In years when sea ice lasts longer in winter, the ocean will overall absorb 20% more CO₂ from the atmosphere than in years when sea ice forms late or disappears early. This is because sea ice protects the ocean from strong winter winds that drive mixing between the surface of the ocean and its deeper, carbon-rich layers.

The findings, based on data collected in a coastal system along the west Antarctic Peninsula, show that what happens in winter is crucial in explaining this variability in CO₂ uptake.

 

Physicists at the University of Liège (Belgium) have succeeded in sculpting the surface of water by exploiting surface tension. Using 3D printing of closely spaced spines, they have combined menisci to create programmed liquid reliefs, capable of guiding particles under the action of gravity alone. This is a promising advance for microscopic transport and sorting, as well as marine pollution control.