In many fish species, water temperature determines the sex of the fry.

Imagine returning to a favorite hiking trail 15 years after your first visit and discovering that many of the plants and animals that once lived there are gone.

At one time, kelp forests — which shelter fish, slow erosion, and sequester carbon — grew along a third of the world’s coastlines. 

A fish–microbe partnership may produce minerals that help shape the marine carbon cycle.

Maxing out at around 200 tons, the blue whale is not only the largest animal on the planet, it is also the largest animal ever to exist.

Whales were not always such massive creatures.

An irreversible shift in the chemical make-up of the Arctic Ocean driven by climate change is disrupting the region’s food chain, a study suggests.

Widespread loss of Arctic sea ice has led to a sharp fall in levels of a key nutrient, affecting populations of plankton, fish, seabirds and marine mammals, researchers say.

Their analysis reveals that exposure to sunlight of vast shallow regions of the ocean previously covered by ice fuels a process that breaks down the nutrient – nitrate – and removes it from seawater.

Read more at: University of Edinburgh

The polar research vessel RV Kronprins Haakon in Fram Strait, Arctic Ocean. (Photo Credit: Lawrence Hislop/Norwegian Polar Institute)

The risk of snakebites is increasing across the world as reptiles shift their habitats to cope with rising temperatures and growing human pressures, a study of venomous snakes has found.

A new study from Adelaide University has found that when ocean acidification makes reef habitat less complex, the fish living there gather in smaller shoals that offer less social protection.

Azara’s owl monkeys, a small primate species found in South America, are heavier today than those that lived a quarter-century ago, and evidence suggests that rising temperatures might have driven the weight gain, according to a Yale-led study of a wild population.