Sentences with phrase «predation at»

Hawkins» research methods and analysis are so problematic that the suggestion of a causal relationship between the presence of cats and the absence of birds (native or otherwise) is highly inappropriate (indeed, Hawkins scarcely investigates predation at all).

The number of animals with tough shells and exoskeletons exploded around 540 million years ago in the early Cambrian, probably in response to a rise in predation at the time.

Not exact matches

Due to this dynamic, striving to maximize market share at the expense of one's rivals makes predation highly rational; indeed, it would be irrational for a business not to frontload losses in order to capture the market.

First, firms may raise prices years after the original predation, or raise prices on unrelated goods, in ways difficult to prove at trial.

What at stake is not merely the logical possibility of a particular, limited situation, such as higher values without predation, or animals who need no food.

At first glance, the claim that coyote trapping does not diminish livestock predation appears significant.

So I guess at the end of the day the best way to protect against online predation is to have an ongoing dialog with your children so that they understand that they can not share too much information and that in fact they have their privacy settings set in such a way that nobody can access any of their online profiles unless they are known to them and they are a real friend.

U.S. Attorney Preet Bharara, his assistants and the FBI did a high service in revealing which species of crimes Silver was committing — at a time when everyone in Albany knew to a moral certainty that the speaker was betraying the public trust and rigging the game to hide his predations.

Not only are native males wasting their time trying to mate with a different species, they are also at high risk of predation for their efforts.

«If that is true, then if we look at older fossil assemblages — say 1 to 1.6 billion years old — the fossilized eukaryote will show no evidence of predation,» Porter said.

In the United States in 2004, researchers estimated annual losses due to coyote predation on sheep and cattle at $ 40 million.

«We're likely looking at a population in transition, and the healthiest transition would almost certainly involve restoring wolf predation to Isle Royale.»

Many ecologists consider three main factors at play: predation, disease and climate change.

«The oyster larvae are probably at risk both for predation and starvation on their way across Skagerrak, and they may have problems surviving the long journey.

They found that species that have evolved noxious sprays as a defense, such as skunks, tend to be nocturnal and subject to predation by other mammals, whereas socially vigilant species, such as mongooses, tend to be diurnal and at risk of predation by birds of prey.

«Their stay is an unusual opportunity to look at predation and how it might affect populations of the marine mammals they eat.»

Homosexual mating is at least as risky as the heterosexual kind, expending sperm, wasting time that could go toward other activities, and boosting the risk of injury, disease, and predation.

Both of these important food sources are at risk — sugar pines are vulnerable to white pine blister rust, a fungal pathogen, while oaks are currently at risk from fire exclusion, mule deer predation and potentially a pathogen causing sudden oak death.

As such, at the farthest spot — in the Arctic — predation was 1/8 that at the equator, the team reports today in Science.

«The Laboratory of Behavioral Ecology and Evolution, together with collaborators from other disciplines at Seoul National University, is focusing now at the spotted lanternflies» display behaviour that helps these insects to avoid predation,» comment Piotr Jablonski and Sang - Im Lee, the co-authors of the study.

Pegging the trend toward giant sizes to the Plio - Pleistocene ruled out other hypotheses such as the threat of predation by the huge shark megalodon — which had already been around for millions of years before the whales» growth spurt — or the advent of filter feeding, which had been around for more than 15 million years at that point.

«The strength of life - history analyses for resolving the extinction debate rests in the knowledge that the age of final weaning is a life - history landmark that is expected to change differently in response to predation and climate - related nutritional stress,» said Cherney, who will speak during the Romer Prize Session at the paleontology meeting.

«This paper ties it all together and shows a very clear relationship between the disappearance of sea ice and increasing predation intensity on seabirds,» says Andrew Derocher, a polar bear specialist and Arctic ecologist at the University of Alberta in Edmonton, Canada.

As their hunting behavior shifts from ice to land, the polar bears «have progressively arrived earlier and earlier to have access to more eggs,» says biologist Børge Moe, another principal author of the study who works at the Norwegian Institute for Nature Research in Kongsfjorden, where seabird egg predation is just beginning to increase.

For example, species at risk of predation tend to sleep less.

Finally, if the macaques have had an evolutionarily significant effect on prey biology, we would expect to find that shellfish on Koram, which are exposed to increased predation pressure, mature at a younger age (and smaller size) than shellfish on NomSao island.

This behavior could make puff adders vulnerable to predation,» says Professor Graham Alexander, who heads the Alexander Herp Laboratory at Wits.

«Strong predation on a massive, heavily - armored dinosaur illustrates just how dangerous the dinosaur predators of the Cretaceous must have been,» says Caleb Brown, a scientist at the Royal Tyrrell Museum.

First, we conducted growth trials at five temperatures crossed with two levels of predation risk (fish predator present versus absent) and measured growth rates, consumption rates, assimilation efficiencies, and production efficiencies of 107 individual damselflies.

Owners who understand that predation is natural for dogs can prevent problems by supervising dogs with other pets and children, at least until they understand the attitudes and behavior of each particular dog in each circumstance.

This Australian study looked at predation rates among owned cats over a two - year period when wearing the Birdbesafe collar cover.

At a larger scale, this method would more accurately assess the seasonal variation in predation rates, individual hunting behavior throughout the year and the actual impact of cat predation on prey populations (Tschanz et al., 2011).

Something else often left out of the debate: predation — even at high levels — does not automatically lead to population declines.

«Predation by foxes and feral cats is the key driver of extinctions, so we need to change what we've previously done and look at if the dingo can help,» said Dr Thomas Newsome of the University of Sydney, the report's lead author.

The use of poison baits can reduce cat density, but even low levels of cat predation can exterminate threatened mammal populations, such as when cats killed at least seven bilbies reintroduced outside the Arid Recovery reserve in South Australia.

If we just add a feral population of at least that many, making it two - thirds of a million — if each cat killed just three birds per year, you can see that the predation is around two million each year.»

Rabbits kept in outdoor hutches are at risk of illness or death from exposure, parasite infestation, and predation.

Furthermore, the question of whether cats are bad for birds at the population level involves a lot more than simple predation numbers.

In journal article after journal article, and book after book, I found cat - predation studies that were flawed by small sample size, samples that were not shown to be typical, unjustified generalizations, a failure to account for confounding factors, and a tendency to assume that predation of individual birds necessarily resulted in damage to bird populations at the species level.

Clearly, these two are eager to talk about domestic cats (see, for example, Clinchy's comments in ScienceNOW and Zanette's in the Winnipeg Free Press), even when their work has nothing at all to do with them (or, given the absurd methods employed, real - world predation in general).

So, what Baker et al. are suggesting is that predation by cats may be extensive enough to deplete populations of certain bird species at their study site, such that at least some of the birds observed there were immigrants from nearby habitat.

More recently, Dauphiné and Cooper use the inflated predation rate suggested by Lepczyk et al. (along with rates proposed by other researchers) to arrive at their «billion birds» figure.

Like Cole Hawkins» dissertation, «Landowners and Cat Predation» is, at best, an interesting pilot study for subsequent work.

Barratt has shown that the actual predation rate, at this level, is less than half the rate predicted by cat owners.

If, after two years at the study site, Hawkins was unable to get a better handle on the presence of the cats, how can he be so sure of their behavior when it comes to predation?

(Washington, D.C., April 18, 2013) A new study from British scientists has documented for the first time, significant new impacts to birds from outdoor cats, reporting that even brief appearances of cats near avian nest sites leads to at least a doubling in lethal nest predation of eggs and young birds by third - party animals, as well as behavioral changes in parent birds that lead to an approximately 33 percent reduction in the amount of food brought to nestlings following a predation threat.

Numerous studies have demonstrated that predation success varies widely among domestic cats: some catch lots of prey while others catch very few — or none at all.

In their recently released book, The American Bird Conservancy Guide to Bird Conservation, ABC changes tack a bit — using what the authors call «conservative» estimates of the outdoor cat population and annual predation rates, for example, to arrive at their figure of «532 million birds killed annually by outdoor cats.»

Predation on Birds Righthand puts the figure for annual bird deaths attributed to feral cats at «around 480 million.»

Contrary to popular belief, cats have low success at bird predation.