Researchers find a widespread decline in dissolved oxygen levels in lakes, which is known to reshape ecosystems.

Phylogenomics data place the enigmatic plankton in the middle of the algal family tree, despite their apparent lack of plastids—an organelle characteristic of all other algae.

In yellow-green and purple versions of the reef-building Acropora tenuis, the genes that code for particular fluorescent and other colorful proteins become more active in the summer, protecting symbiotic algae from thermal stress and resisting bleaching.

Tests point to a toxic algal bloom that might have led to the unprecedented deaths of hundreds of African elephants in Botswana earlier this year, but the evidence isn’t conclusive.

The 1-billion-year-old impressions have features similar to modern algae and indicate that photosynthesizing plants evolved at least that long ago.

Biological production of this greenhouse gas, once thought to be the reserve of anaerobic microbes, occurs in these widespread, photosynthesizing cyanobacteria.

Anemones keep their algae populations in check.

A single-celled organism has an energy-producing enzyme with unique features.

An analysis suggests that DNA cribbed from soil microbes enabled plants’ ancestors to colonize a terrestrial environment.

The protist Rhodelphis limneticus bears little resemblance to its close genetic relative, red algae.

Selected Images of the Day from the-scientist.com

Diverse plots of corals appeared healthier than monocultures at the end of a 16-month study.

Green fluorescent protein lures algal symbionts to corals.

Scientists discover a third fungus that is widespread in lichens, but it’s not clear yet whether it’s a partner in the algal-fungal symbiosis or a bystander.

Algae on the reefs make a sound when they produce gas bubbles.

The genome of Ulva mutabilis is the first of a green seaweed to be sequenced.

A marine flatworm swarms in a circular fashion off the coast of Guernsey.

Can clay particles, ozone, or phages stop the algae bloom that is killing wildlife and posing a health risk to humans?

The British Phycological Society declares the winners of a photography contest for images of algae.