8,095 results
- Earth
Sexual Hang-Up: Fish hormones change when oxygen is scarce
Oxygen deprivation—an escalating problem in freshwater ecosystems worldwide—tampers with sex hormones in carp and might underlie the decline in some fish and amphibian species.
- Earth
Methylmercury’s toxic toll
More than 60,000 children are born each year with neurodevelopmental impairments due to their prenatal exposure to methylmercury.
- Earth
Spawning Trouble: Synthetic estrogen hampers trout fertility
Exposure to a synthetic estrogen called ethynylestradiol, which is commonly found in birth control pills and enters the waterways through sewage effluent, reduces male trout’s fertility by half.
-
Dolphins bray when chasing down a fish
The first high-resolution analysis of which dolphin is making which sound suggests that hunters blurt out a low-frequency, donkeylike sound that may startle prey into freezing for an instant or attract other dolphins.
- Animals
Many fish run on empty
Many fish eat all the time, while some others spend their days going from brief feast to lengthy famine.
- Animals
Musical Pairs: Egg-deploying bird species divide for a song
A new genetic analysis bolsters the idea that musical taste, rather than geography, split Africa's indigobirds into multiple species.
- Health & Medicine
Counting Carbs
Although low-carbohydrate diets can be powerful weight-loss tools, many physicians now conclude they aren't for anyone who isn't under a doctor's watchful eye.
- Earth
Indonesian reefs fell prey to fires
The fires that swept through Indonesian rain forests late in 1997 apparently laid waste to some marine ecosystems, as well.
- Chemistry
Sensor sniffs out spoiled fish
A new electronic nose detects amine compounds produced when fish decay.
- Earth
What’s happening to German eelpout?
Reproductive anomalies in eel-like fish may represent good markers of exposure to hormones or pollutants that mimic them.
-
Protein Portal: Enzyme acts as door for the SARS virus
A protein that regulates blood pressure also serves as the cellular portal for the SARS virus.
- Earth
Mapping watersheds invites comparisons
Computerized maps of environmental features for 154 of the largest river watersheds will soon be available to the public, free of charge.
