8,314 results
8,314 results for: Fish
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18938
In grad school, I read and learned from Ernst Mayr’s Populations, Species, and Evolution (1963, 1970, Harvard University Press). I think that “Alarming butterflies and go-getter fish” extremely simplifies Mayr’s position on speciation. The article says that Mayr focuses solely on geographic separation, “allopathic speciation.” This ignores the fact that Mayr discussed a variety of […]
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18943
“Salmon hatcheries can deplete wild stocks” ignores a basic fact. Hatchery stocks came from wild stocks. Their DNA is the same. There is an abundance of underused habitat in our northwest rivers. Some hatchery salmon would use these habitats if they were left alone. Instead, hatchery fish are clubbed to death to prevent their mixing […]
- Animals
How the ghost shark lost its stomach
The lack of a digestive organ in fish and other animals is linked to genetics.
- Microbes
Gut bacteria respect diets, not borders
Malawian and Guahibo gut microbiomes resembled those of herbivorous mammals, while American guts were more similar to carnivores’.
- Animals
Dog-paddle science debunks notion of underwater trot
From Newfoundlands to Yorkshire terriers, canines swim with similar, distinctive gait.
- Earth
Creativity offers insights into the past and future
With the long-term future of many fisheries in doubt and severe drought once again hitting the Southwest, coming up with new insights into the past and future on land and sea may be crucial to protecting some of our most precious resources.
- Animals
Swimming dolphins don’t need to cheat
Dolphins swimming through bubbles burst old notion of underpowered muscles.
- Life
Pigment pas de deux puts stripes on zebrafish
Interactions between color-producing cells generate patterns on fish fins.
- Archaeology
Stone Age fishing spear found on Southeast Asian island
Notched piece of bone found near Indonesia illustrates surprisingly complex tool making 35,000 years ago.
- Humans
Letters from the May 27, 2006, issue of Science News
Dig it or don’t I am rather surprised at all the attention this find is getting (“Out of the Shadows: Not all early mammals were shy and retiring,” SN: 3/18/06, p. 173). Some would think that these mammals caused the downfall of the dinosaurs, but the fossil record suggests a very different scenario. There is […]
- Health & Medicine
New tests screen for lethal prion disease
Urine and nasal swabs can detect small amounts of the abnormal prions that cause Creutzfeldt-Jakob disease.
- Oceans
Mercury at ocean surface may have tripled since preindustrial times
Questions remain over dangers of toxic metal in environment.
