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Crabs in Biological News

Evolution: Crabs go deep to avoid hot water

... all over the world, around 100 species of king crabs live largely undiscovered. The fraction that we ... its body. At temperatures of around 1- 4C, these crabs thrive in some of the colder waters on Earth; ... in the cooler water towards the poles are king crabs found near the water surface though temperatures ...

Crabs' memory of pain confirmed by Queen's academic

... University Belfast academic has shown that crabs not only suffer pain but that they retain a ... study, which looked at the reactions of hermit crabs to small electric shocks, was carried out by ... used in food industries are treated. Hermit crabs have no shell of their own so inhabit other ...

Crab claws pack strengthening bromide-rich biomaterial

... also is present on the walking legs of Dungeness crabs (Cancer magister), a dining delicacy in the Pacific Northwest. "The types of crabs that use this trick for their claw tips rely on ... a researcher in the UO physics department. "These crabs include many ...

Honest crabs, power to the hungry, nice mice and clever meerkats: News from the American Naturalist

... chances are it's not bluffing. Using hermit crabs as subjects, Laidre tested previous mathematical ... 40 percent of the time. Laidre used dummy hermit crabs to invade the personal space of live crabs. Contrary to the models, the crabs nearly always backed up their threats with an ...

Decline of shorebird linked to bait use of horseshoe crabs

... concluded that the increased harvest of horseshoe crabs led to a reduction in the food supply for red ... tradition in Delaware Bay of harvesting horseshoe crabs for use as bait in various fisheries. In the years from 1992 to 1997, reported harvest of crabs grew 20 fold from about 100,000 individuals ...

Global warming threatens Antarctic sea life

... shallow marine waters of Antarctica. Predatory crabs are poised to return to warming Antarctic waters ... about to change. "Populations of predatory king crabs are already living in deeper, slightly warmer ... dropped about 41 million years ago and crabs and fish were frozen out, the slow-moving ...

Fiddler crabs reveal honesty is not always the best policy

... ecologists has discovered that some male fiddler crabs "lie" about their fighting ability by growing ... , the study is the first direct evidence that crabs "bluff" about their fighting ability. The ... - they are just two centimetres across - fiddler crabs are ideal for studying dishonesty in signalling. ...

Turning freshwater farm ponds into crab farms

... is leading to a new kind of crab harvest blue crabs grown and harvested from freshwater ponds, ... worry, researchers say, because the pond-raised crabs look and taste just like their ocean-raised ... blue crabs. "We started out by catching small crabs in the wild and stocking them into farm ponds ...

Shell-breaking crabs lived 20 million years earlier than thought

... has helped rewrite the evolutionary history of crabs and the shelled mollusks upon which they preyed. ... of a big crab with an oversized right claw. Such crabs with claws of different sizes were not known to ... it. The fossil re-opens the question of the role crabs played in the well-documented restructuring of ...

New 150 million-year-old crab species discovered

... Romania. Previously unexamined, these ancient crabs from the Prosopidae family existed more than 150 ... period. Studying primitive and extant crabs helps determine various aspects of biodiversity ... countries as a source of food. In addition, crabs have been remarkably resistant against ....

Tropical crab invades Georgia oyster reefs -- but the long-term impact can't be predicted

... long-term impact will be. Unlike native crabs that eat baby oysters, mussels and fish, the ... that is changing the rate at which fish and other crabs are feeding on the native species. The impact of the crabs is important because oysters are a foundation ...

First finding of a metabolite in 1 sex only

... have discovered a chemical compound in male blue crabs that is not present in females -- the first time ... an unusual signal in the gill tissue of male blue crabs that was absent in females. NMR can be ... The researchers tested gill tissue from crabs harvested in six different years from the ...

Resilin springs simplify the control of crustacean limb movements

... open access journal BMC Biology , of the movements of the mouthparts of crabs and crayfish. Malcolm Burrows from the University of Cambridge, UK ... of resilin, an elastic protein found in many insects and crustaceans, in crabs and crayfish caught in Norfolk and Cambridge, UK, and in Washington, USA. ...

Climate change causing significant shift in composition of coastal fish communities

... progressively from vertebrate species (fish) to invertebrates (lobsters, crabs and squid) and from benthic or demersal species those that feed on the ... top." Collie noted that the increase in the numbers of lobsters and crabs is a result of their taking advantage of the benthic habitat abandoned by ...

Rare albino ratfish has eerie, silvery sheen

... and conservation. Pietsch says ratfish seek meals of sea-bottom worms, crabs and clams by burrowing their snub snouts into the mud and using special ... muscles. Powerful jaws and grinding teeth able to crack the shells of crabs and clams require caution by researchers and fishermen who handle them. ...

Smithsonian identifies invasive crab species in Panama Canal expansion area

... and reproducing in Panama. The researchers report that Harris mud crabs are reproducing in the small, man-made lake designated to become the third ... males, egg-bearing females and juveniles. While individual Harris mud crabs were reported from Panama in 1969, this is the first report of an ...

Smithsonian identifies invasive crab species in Panama Canal expansion area

... and reproducing in Panama. The researchers report that Harris mud crabs are reproducing in the small, man-made lake designated to become the third ... males, egg-bearing females and juveniles. While individual Harris mud crabs were reported from Panama in 1969, this is the first report of an ...

U-M researcher and colleagues predict large 2009 Gulf of Mexico 'dead zone'

... same process occurs in the Chesapeake Bay, where nutrients in the Susquehanna River trigger the event. In both the Gulf and the Bay, fish, shrimp and crabs are forced to leave the hypoxic zone. Animals that cannot move perish. The annual hypoxia forecasts helps coastal managers, policy makers, and the ...

Crustacean shell with polyester creates mixed-fiber material for nerve repair

... Now researchers at the University of Washington are using the same principle for biomedical applications. Mixing chitosan, found in the shells of crabs and shrimp, with an industrial polyester creates a promising new material for the tiny tubes that support repair of a severed nerve, and could serve ...

Penn biologists demonstrate that size matters... in snail shells

... Stouter and thicker shells have been reported for N. lapillus and several other species following the introduction of predatory Carcinus maenas crabs early in the 20th century. Indeed, researchers hypothesize that when the snails are exposed to crab cues, shells of small snails first thicken and ...

Origin of claws seen in 390-million-year-old fossil

... New Haven, Conn. A missing link in the evolution of the front claw of living scorpions and horseshoe crabs was identified with the discovery of a 390 million-year-old fossil by researchers at Yale and the University of Bonn, Germany. The specimen, named ...

Scientists discover 'hot spot' for toxic HABS off Washington coastline

... of this toxic alga and determine why it produces a deadly biotoxin. This naturally-produced biotoxin, domoic acid, can accumulate in shellfish, crabs and some fish. By attacking the nervous system it can cause adverse health effects or even death in birds, marine mammals and humans who consume ...

'Hot spot' for toxic harmful algal blooms discovered off Washington coast

... this toxic alga, and to determine why it produces a deadly biotoxin. This naturally-produced biotoxin, domoic acid, can accumulate in shellfish, crabs and some fish. By attacking the nervous system it can cause adverse health effects or death in birds, marine mammals and humans who consume ...

Dramatic expansion of dead zones in the oceans

... global warming would leave ocean dwellers gasping for breath. Dead zones are low-oxygen areas in the ocean where higher life forms such as fish, crabs and clams are not able to live. In shallow coastal regions, these zones can be caused by runoff of excess fertilizers from farming. A team of Danish ...

Ocean fish farming harms wild fish, study says

... areas with sea-cage farm fish. "Sea lice are an important example of disease transfer in ocean fish farming," explains Frazer. "Sea lice are tiny crabs that attach to marine fishes, eating their skin and sometimes deeper tissue. Skin is important to fish because they need to keep their tissues less ...

Brown scientist finds coastal dead zones may benefit some species

... in healthier waters. He thinks it's because the predators return as oxygen levels in the water rise, and those hunters primarily sea stars, fish and crabs feast on the clams. That means quahogs could fare worse if Narragansett Bay's waters got cleaner. Yet Altieri is not advocating that hypoxic ...

480-million-year-old fossil sheds light on 150-year-old paleontological mystery

... of life. Different authors suggested relationships to groups as varied as mollusks (clams and snails), barnacles (crustaceans including shrimps, crabs and crayfish), echinoderms (starfish and sea urchins) and annelid worms (aquatic bristle worms and garden earthworms). This inch-long specimen ...

390-million-year-old scorpion fossil -- biggest bug known

... Conn. The gigantic fossil claw of an 390 million-year-old sea scorpion, recently found in Germany, shows that ancient arthropods spiders, insects, crabs and the like were surprisingly larger than their modern-day counterparts. Imagine an eight-foot-long scorpion, said O. Erik Tetlie , ...

Ancient whale fall from California's Ao Nuevo Island one of youngest, most complete known

... in the 1980s, are whale carcasses that fall to the deep-ocean floor where, like an oasis in the desert, they attract a specialized group of clams, crabs and worms that feed for up to decades on the oil-rich bones and tissues. Some scientists think these random, deep-ocean oases are stepping stones ...

Ancient whale fall from California's Año Nuevo Island one of youngest, most complete known

... in the 1980s, are whale carcasses that fall to the deep-ocean floor where, like an oasis in the desert, they attract a specialized group of clams, crabs and worms that feed for up to decades on the oil-rich bones and tissues. Some scientists think these random, deep-ocean oases are stepping stones ...

'New continent' and species discovered in Atlantic study

... and corals encrust rocky cliffs, whereas areas of soft sediment are populated by starfish, brittle-stars, sea cucumbers and burrowing worms. Fishes, crabs and shrimps forage over the ridge exploiting whatever they can find. Trawls, traps and corers have brought back thousands of specimens for study back ...

Microbes compete with animals for food by making it stink

... microbes could produce chemicals that prevented crabs or fishes from using these resources, then those ... of texture, they fed stone crabs, lesser blue crabs and striped hermit crabs noodle-like test foods made from pureed forms of ...

Mussels evolve quickly to defend against invasive crabs

... development in the arms race between these crabs and these mollusks." crabs prey on blue mussels by crushing their shells. ... the scientists say, mussels are prey to many crabs as well as other marine species. "When ...

Exotic crab poised for widespread UK invasion

... UK estuaries in several years time. Mitten crabs are unwelcome because they prey on protected UK ... to control the population. Chinese mitten crabs are already present in some of our waterways, ... study details how the UK colonisation of mitten crabs has increased on a large scale in recent years. ...

Biologist Discovers What May Be World’s ‘Pickiest?Mates

... crenulata may check out 100 or more male fiddler crabs and their burrows before finally deciding on a ... said in her paper. But female California fiddler crabs are much pickier, she discovered in her study, ... and six minute search. Why are female fiddler crabs so picky? The survival of their offspring, ...

Smithsonian scientists discover new marine species in eastern Pacific

... they live between grains of sand to 6-foot-long specimens that eat entire crabs and sea hares. During the expedition, Norenburg discovered ... which aims to determine the relationships among all families of crabs and shrimps. Even soft corals, a relatively well-studied group, yielded ...

Marine 'dead zone' off Oregon is spreading

... National Marine Sanctuary indicate. There have been reports of dead crabs stretching from the central Oregon coast to the central Washington coast. ... extent. Some crabbers in the central Washington coast reported all dead crabs in pots at depths of about 45-90 feet, north of the Moclips River. Large ...

Horseshoe crab decline threatens shorebird species

... on horseshoe crab eggs resulting from the largest spawning of horseshoe crabs found on the East Coast of the United States. Researchers from Virginia ... However, due to horseshoe crab's popularity as bait used by fishermen, the crabs appear to be in serious decline. At the same time, there has been a great ...

Ocean temperature predicts spread of marine species

... if we want to attempt to manage or conserve it." Using data from 72 marine species, including cod, herring, American lobster, horseshoe crabs and clams, O'Connor and her colleagues developed a model that predicts how far larvae travel at a certain temperature. The predictions appear to hold ...
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(Date:8/29/2014)... available in German . ... the natural nitrogen cycle on Earth and in biological ... thought to depend on nitrite as their source of ... Daims, a microbiologist at the University of Vienna, has ... an alternative source of energy. The oxidation of hydrogen ...
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