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Predation in Biological News

Geographic profiling applied to track hunting patterns of white sharks in South Africa

... VIRGINIA KEY, Fla. -- predation is one of the most fundamental and fascinating ... in False Bay. They were able to observe natural predation by great white sharks because attacks occur at ... researchers found that spatial patterns of shark predation at this site were nonrandom and that smaller ...

Salmon smolt survival similar in Columbia and Fraser rivers

... can include water temperature, contaminants, predation attempts, and availability of food, forcing fish ... led to the surprising discovery of the impact of predation from colonies of terns. In 2000, OSU introduced ... without dams, mortality can be a function of predation especially by fish, birds and seals or it can ...

New book further supports controversial theory of 'Man the Hunted'

... since the first book's publication, evidence of predation by eagles, cannibalism, cut and tooth marks, ... which sabertooth cat fangs fit, says Sussman. The predation rate on savannah antelope and certain ... social groups. Most ecologists agree that predation pressure is one of the major adaptive reasons for ...

Study reveals predation-evolution link

... by surveying the literature for incidents of predation in marine invertebrates, such as clams and their ... First Huntley and Kowalewski found that predation increased notably about 480 million years ago, ... There is a strong correlation between predation intensity and global marine biodiversity in the ...

Wolves find happy hunting grounds in Yellowstone National Park

... kill sites and concluded that spatial patterns of predation between wolves and elk are more strongly ... Prime-age adult elk are largely invulnerable to predation from wolves, which are highly selective and ... off escape routes)offer the greatest risk of wolf predation for elk. Also, deep snowy areas, which are much ...

Scientists find universal rules for food-web stability

... links are less likely to be stable, while a strong dependence of predation on predator density destabilizes the system. On the other hand, a strong dependence of predation on prey density has a stabilizing impact on food webs. Differences ...

Noise pollution negatively affects woodland bird communities, says CU-Boulder study

... black-chinned hummingbirds and of other species was due to lower levels of predation by a major nemesis of the birds -- the western scrub jay -- which was ... of noise and nested in quiet areas were subject to greater rate of nest predation than those in noisy areas, he said. Woodland birds that prefer noisy areas ...

Wolf reintroduction proposed in Scottish Highland test case

... the populations of grazing animals, but also their behavior. The threat of predation and attack can fundamentally change the movement and activities of grazing ... essentially the same animal as elk in the United States have not faced predation or fear such as that for 250 years. Deer densities in that country are now ...

As super-predators, humans reshape their prey at super-natural speeds

... the Proceedings of the National Academy of Sciences ( PNAS ). Human predation is accelerating the rate of observable trait changes by 300 percent above ... vast numbers and targeting large, reproductively mature individuals, human predation is quickly reshaping the wild populations that remain, leaving smaller ...

Researchers document rapid, dramatic 'reverse evolution' in the threespine stickleback fish

... reverse evolution in the sticklebacks is from the higher levels of trout predation after the sudden increase in water transparency, said Peichel, whose ... of the fish to quickly adapt to environmental changes such as increased predation by the cutthroat trout is due, Peichel believes, to their rich genetic ...

Sand dollar larvae use cloning to 'make change,' confound predators

... than it had been. The larvae responded to the general threat of predation rather than the immediate possibility of predator attack, said Dawn ... we would suggest that might be the trade off. But if they don't avoid predation in the first place they would never get to the sea floor," she said. ...

Hareless: Yellowstone's rabbits have vanished, study says

... at the University of Montana. It could be disease, extreme weather, predation or other factors, Dr. Berger said. Since the rabbits blipped off without ... prey species in the Greater Yellowstone Ecosystem may be causing elevated predation by coyotes on juvenile elk, pronghorn and other ungulates. Elsewhere, ...

Living with lions

... is a daily reality. Although loss of human life is rarely reported, lion predation can cost the herders close to 1000 US$ per family each year. Scientists ... are not a suitable alternative in this Islamic part of Cameroon. Lion predation is a common phenomenon in the area, and people have accommodated these ...

Humans unknowing midwives for pregnant moose

... Royal Societys journal Biology Letters, the study says that moose avoid predation of their calves by grizzly bears by moving closer to roads and other ... Yellowstone and elsewhere, moose mothers have apparently buffered against predation on offspring using roadside corridors, said Wildlife Conservation Society ...

Scary ancient spiders revealed in 3-D models, thanks to new imaging technique

... a picture of what was happening during this period early in the history of life on land. We think one creature could have responded to increasing predation from the amphibians by growing spikes, while the other responded by becoming an ambush predator, hiding away and only exposing itself when it had to ...

UBC researchers find first-ever 'wanderlust gene' in tiny bony fish

... we've identified may also shed light on why there's still a small but constant population of armour-less sticklebacks in the sea despite the high predation there. Sticklebacks with the mutant allele just like to go to new places." ...

Animal and plant communication at the ESA Annual Meeting

... be more adept at camouflaging themselves by finding the best places to hide or to blend in. Singer's experiment is the first to quantify bird predation on specialist and generalist herbivores, and he hopes it will spark further research. He says that the interactions among the three trophic levels ...

Bizarre walking bat has ancient heritage

... Dr Hand. "This study shows that, contrary to existing hypotheses, bats are not overwhelmingly absent from the ground because of competition from, or predation by, other mammals. "Unlike for birds, there is currently no evidence that any bat has evolved a reduced capacity for flight as a result of ...

US-Mexico border wall could threaten wildlife species

... "Putting in poles near the fence could allow the owls to swoop down from a perch, and planting brush to provide better cover could help them avoid predation by larger avian species and improve their chances for colonization." Maintaining or augmenting trees that are taller than the fence, and that are ...

Scientists 'rebuild' giant moa using ancient DNA

... says. A co-author of the study, Dr Jamie Wood from Landcare Research, says it is likely that the drab colouring was driven by selection to avoid predation by the extinct Haast's eagle, the largest and most powerful eagle in the world. The research team also demonstrated that it is possible to ...

'Jellyfish joyride' a threat to the oceans

... Trends in Ecology and Evolution , in time for World Oceans Day on 8 June. "Fish normally keep jellyfish in check through competition and predation but overfishing can destroy that balance," Dr Richardson says. "For example, off Namibia intense fishing has decimated sardine stocks and jellyfish ...

Fossil bone bed helps reconstruct life along California's ancient coastline

... the rarity of bones marked by shark bites, plus the occurrence of terrestrial animals such as tapirs and horses that must have washed out to sea, predation by sharks like Carcharocles megalodon seems unlikely to have been the major source of the bone bed, the authors wrote. Because of few young or ...

Midge keeps invasive mosquito in check, aiding native mosquitoes

... size differences between the mosquito species. The treehole mosquito is larger than the Asian tiger mosquito, which makes it less vulnerable to predation from the small but voracious predatory midge. Previous studies have found that the native mosquito larvae also adopt less "risky" behaviors than the ...

Snakes and how they helped our big brains evolve

... evolution. In "The Fruit, the Tree, and the Serpent: Why We See So Well" (Harvard University Press; April 30, 2009; $45.00), Isbell tells us that predation pressure from snakes is ultimately responsible for the superior vision and large brains of primatesand for a critical aspect of human evolution. ...

Male flower parts responsible for potent grapevine perfume: UBC research

... we think." The team also found that emission of perfume is light-dependent and is strongest at dawn, possibly to coincide with pollination and predation activities. ...

Male flower parts responsible for potent grapevine perfume: UBC research

... we think." The team also found that emission of perfume is light-dependent and is strongest at dawn, possibly to coincide with pollination and predation activities. ...

American carnivores evolved to avoid each other, new study suggests

... first plotted the known ranges of all of the American carnivores on one big digital map. Assuming that wherever ranges overlapped, competition and predation between those species was possible, they then compared those animals' behavioral characteristics, body sizes and coloration. By analyzing this huge ...

Invasives threaten salmon in Pacific Northwest

... of invasive species in each area ranged between 86 and 486, the majority being plants and fish. Sanderson and colleagues assembled reports of predation by six nonindigenous fish species: catfish, black and white crappie, largemouth bass, smallmouth bass, walleye, and yellow perch. Hundreds of ...

Lincoln Park Zoo awarded $1.5 million grant for new research institute

... the prevalence of raccoon roundworm with the goal of creating management strategies to mitigate risk to humans, as well as a study on avian nest predation with the goal of improving urban habitat for birds. Lincoln Park Zoo's Urban Wildlife Institute will also be enlisting local partners for ...

Climate change effects on imperiled Sierra frog examined

... issue of the journal " Herpetological Conservation and Biology " where they show how a combination of the shallow lakes drying up in summer and predation by introduced trout in larger lakes severely limits the amphibian's breeding habitat, and can cause its extinction. "Environmental factors that ...

Land iguanas under continuing threat on Galapagos archipelago

... the islands' native plants and animals have faced grave challenges, including severe pressures from introduced species, habitat destruction and predation by man himself. In some instances, this has led to reduced populations and even extinction. In the 20th century, conservation efforts began, but ...

Texas A&M anthropologist discovers long-lost primate in Indonesia

... between behavior and lunar cycles. Her most recent research project involves the relationship between group living and ecological pressures such as predation and the temporal distribution of resources. Gursky-Doyen, who began work on her dissertation in 1993 in the central part of Indonesia, says she is ...

Predatory bacterial swarm uses rippling motion to reach prey

... the ripple wavelength gets longer. Eventually, when there is no more prey, the rippling behavior dissipates. "The rippling appears to enhance predation by keeping more M. xanthus cells in the location of the prey cells," Kirby said. Finally, the UI study found that the bacteria use a ...

156th Acoustical Society of America Meeting, Nov. 10-14, 2008 in Miami

... appears not only to influence avian nesting patterns, thereby altering the avian community, but also to influence nest success through changes to predation ... http://asa.aip.org/web2/asa/abstracts/search.nov08/asa22.html . EXPRESSION OF EMOTIONS IN ENGLISH, GERMAN, HINDI, AND ARABIC ...

Florida's 'worm grunters' collect bait worms by inadvertently imitating mole sounds

... ground: a process that took anywhere from 10 minutes to over an hour. "This represents a major risk to the earthworms because they are vulnerable to predation and to dehydration," Catania observes. The next step was to determine how the native earthworms respond to the presence of moles. He built a small ...

Biological invasions increasing due to freshwater impoundments, says CU-Boulder study

... -- has spread through the Great Lakes region and into the Mississippi and Hudson Bay watersheds, impacting local fish populations through predation and competition. Johnson said. Climate-induced changes to water availability and increasing demand for water and flood control are expected to ...

ESA to feature wide range of UW-Madison presentations

... potential in central sands Wisconsin agroecosystems (Tuesday, Aug. 5 at 11:10 a.m.) COS 78-1, Influence of non-crop habitat on weed seed predation within potato crops (Thursday, Aug. 7 at 8:00 a.m.) COS 78-5, Applied plant ecology in an agricultural landscape: Linking potato production with ...

Leatherback turtles go with the flow

... turtle population in the Eastern Pacific has declined by 90% in the past two decades. Leatherbacks begin life as eggs on the beach and are subject to predation the minute they hatch and attempt to crawl to the ocean. From birth through adolescence, they are vulnerable to birds and other sea creatures. By the ...

River damming leads to dramatic decline in native fish numbers

... increased the ability of larvae to encounter the plankton that they feed on. Fish also rapidly outgrew their period of high-vulnerability to predation due to higher water temperatures," she declares. "Damming the Colorado River has brought about the replacement of streams and rivers with large, ...

Project succeeding to relocate Caspian terns

... and Wildlife Research Unit is being funded by a $2.1 million grant to OSU from the Corps and Bonneville Power Administration. The Corps' avian predation program aims to reduce the number of young salmon consumed by terns in the estuary and "substantially improve the survival of fish listed as ...
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