Tag: "mollusks" at biology news
Scientists discover 5 new species of sea slugs from the Tropical Eastern Pacific
...an Malacological Bulletin. Nudibranchsa group of mollusks
lacking outer shellshave developed sophisticated chemical defense mechanisms, which is particularly important because promising industrial and medicinal products have been isolated from known species. New species may provide cures for diseases that ...
AGU Journal highlights -- February 23, 2007
...periments, the calcification rates of two types of mollusks
kept in closed laboratory environments declined linearly with increasing levels of carbon dioxide in the air. Such creatures grow their shells by a process of calcification, or deposition of calcium carbonate. Data from the third assessment of the In...
How many genes does it take to learn? Lessons from sea slugs
...ings are especially important for scientists using mollusks
in experimental systems, according to Edgar Walters, Ph.D., a professor of integrative biology and pharmacology at the University of Texas Medical School at Houston, who was not involved in the research. "Few animals other than Aplysia allow scien...
Ice-breaker Polarstern to explore uncharted seafloor
...rticles, as well as clusters of large clams. These mollusks
and their associated fauna probably depend on chemical energy from the Earth, rather than one driven by photosynthesis from the sun or from hot emissions rising from inside the planet. OUTREACH OPPORTUNITY: A MEDIA CONTACT OFFICER ONBOARD A major ...
Tropics source of much of world's biodiversity
...imals - oysters, clams, scallops and other bivalve mollusks
- about three-quarters of today's genera originated in the tropics and spread outward toward the poles, while only one-quarter originated at higher latitudes. Other plants and animals probably have an overwhelmingly tropical origin also, said coauth...
Scientist's persistence sheds light on marine science riddle
... www.data.acnatsci.org/wasp ) documents species of mollusks
in the Western Atlantic, from Greenland to Antarctica. Scientists have suggested several explanations for the evolution of body size in animals isolated on islands: reduced area, fewer predators, less competition, and resource limitation. "Only reso...
Ocean seep mollusks may share evolutionary history with other deep-sea creatures
The unusual mollusks
of oceanic cold seeps--strange clams, mussels and ...record is a full epoch earlier than that of marine mollusks
in general, according to Steffen Kiel and Crispin Little of the University of Leeds. These findings...
Mussels evolve quickly to defend against invasive crabs
... Freeman. "We wanted to know, how is it that these mollusks
can recognize a crab that is historically not present in North America?" Freeman exposed mussels native to the northern above mid-coast Maine and southern New England to both Carcinus and the Hemigrapsus. Both populations thickened their shells w...
A dichotomy in migration patterns found for sea turtles in east Atlantic
...nt-were larger, and they feed on thearthropods and mollusks
that are normally abundant in this food-richecosystem. In contrast, adults foraging in the open ocean are smaller, havea more limited capacity for diving, and most likely feed on a somewhatdifferent set of prey that includes small, floating plants an...
Study finds evolution doesn't always favor bigger animals
...regulate their internal body temperatures, such as mollusks
to turtles, also follow this rule. "It is a bit of a puzzle why Bergmann's Rule holds in cold-blooded animals like ostracodes," said Hunt. Hunt and Roy found that as ocean temperatures declined by some 10 degrees centigrade, from 40 million years a...
New techniques study the brain's chemistry, neuron by neuron
...l neuropeptides in a range of neuronal models from mollusks
to mammals. "We work with sea slugs, whose simple brains contain 10,000 neurons; we work with insects possessing one million neurons; and we work with mice having 100 million neurons," said Sweedler, who also is a researcher at the Beckman Institute ...
Discovering an ecosystem beneath a collapsed Antarctic ice shelf
...t have already begun to bury the delicate mats and mollusks
established within the underwater environment. He added that there may be a sense of urgency to investigate the unusual seafloor ecology below the Larsen shelf because of the likelihood of increased sediment deposition. In addition, he suggests that ...
500 million years of errors: Brachiopod shells record shadow of arms race in ancient oceans
...uncommon in modern seas that 25 percent or more of mollusks
are done in by voracious drilling killers such as ...tes, and there have also been extensive studies on mollusks
in the more recent fossil record, this is the first comprehensive study of predation on brachiopods ...
Highlights of chemical society national meeting in San Diego, March 13-17
..., oysters may boost libido For centuries, marine mollusks
such as clams, oysters and scallops have been thou...he chemical composition of tissues from a group of mollusks
commonly consumed in Mediterranean countries and found that they contain D-aspartic acid and NMDA (N...
Oceans more vulnerable to agricultural runoff than previously thought, study finds
... which release toxins in the water that can poison mollusks
and fish. Excessively large blooms can also overwhelm a marine ecosystem by depleting oxygen in the water. Scientists suspect that many harmful blooms are artificially fueled by fertilizer runoff from farms, which dump tons of excess nitrogen into ri...
Researchers discover direct link between agricultural runoff and massive algal blooms in the sea
... which release toxins in the water that can poison mollusks
and fish. Excessively large blooms can also overwhelm a marine ecosystem by creating oxygen-depleted "dead zones" in the ocean. Scientists have long suspected that many harmful blooms are fueled by fertilizer runoff from farming operations, which in ...
How the sea urchin grows new spines
... same strategy is used by immature sea urchins and mollusks
in the larval stage to build internal skeletons, t...de variety of spiny and shelled sea creatures like mollusks
and corals. In addition, the idea of growing single crystals by first creating the material in an am...
Are museum collections of ancient life representative?
...n terms of diversity and abundance compared to the mollusks
preserved as fossils in nature from these time periods. A bulk collection is "when you chop a cubic meter of sediment out of a river bank, for instance," Barbour Wood said. "The larger the sample, or more samples you collect, the more likely you are...