Sentences with phrase «higher breeding population»

Studies in Scotland and Wales both suggest that killing foxes leads to a slightly higher breeding population the next year, probably because more foxes move in to contest the vacant area than were there in the first place.

Not exact matches

Using high school level science, explain to us how 4 breeding pair of humans, with 5 members sharing much of the same genetic material, can provide enough genetic diversity for the population to continue.

High lemming populations improve breeding success, and irruptions typically consist mostly of hatch - year birds (ones born this year).

Lemmings bred fastest at high altitudes thanks to longer - lasting snow — but rising temperatures could see these snow - covered areas shrink, fragmenting lemming populations, says Ims.

From highs of tens of millions of bison, the breeding population dropped to hundreds at most.

With only 90,000 breeding individuals sparsely distributed across 15 states in the U.S., the Swainson's warbler is a species of high conservation concern that, for decades, has left conservationists with little confidence that its populations would ever be fully secure.

They borrowed an analytical technique used in agricultural breeding (but never before applied to the study of wild populations) to determine that squirrel babies born earlier in the spring thrive and reproduce at a higher rate than squirrels born later.

In 1991, with only 100 field crickets remaining in a single population in West Sussex, researchers at the London Zoo embarked on the sort of captive breeding program usually reserved for higher - profile or furrier animals.

These diverse populations, combined with high - powered computation, should allow breeding predictions for a variety of incremental improvements in traits like drought tolerance, nitrogen use and aluminum tolerance.

The same thing happened in Colonial India [i]: a bounty was offered on cobras because they were attacking people, which caused people to breed cobras for more bounties, and ultimately resulted in a higher cobra population when the bounty system was abandoned and the breeders released their now worthless snakes.

Most dogs have wolfiness scores of 1 % or less, although we occasionally find populations and breeds with higher scores and even some especially unique individuals with scores of 5 % or more.

The greatest improvement, however, can be expected in breeds with low population, high heritability, and strong breed clubs concerned about genetic defects; likewise the greatest decline in joint quality can be expected in breeds experiencing the fastest growth in popularity and indiscriminate breeding.

High - risk animals include dogs and cats less than six months old, bully breeds of dogs (as these breeds account for a significant portion of the intake population at Young - Williams) and «community» or feral cats.

With so many dogs from so many places in one area, and the demand for pulling dogs high, (including from the mail service which was trying to support the population explosion), it is not surprising that this region became a melting pot of sled dog breeds.

The National Canine Research Council states that despite a lack of concrete evidence linking specific breeds to a higher rate of dog bites, as well as an outright lack of success in reducing the number of dog - bite related injuries, BSL is incredibly expensive for the communities affected by it, draining resources that could otherwise be used to promote more humane and effective forms of population control and in turn, reduce overcrowding in shelters.

This is still much too high but does reflect a pretty standard number when compared to other breed population spikes that we've seen in the past.

Unfortunately in the Oakland area we have a high population of pit bulls and their chances in shelters are lower than that of other breeds.

The Italian greyhound is a relatively rare breed with a high degree of relatedness within the population so it would not be terribly surprising to find some individuals carrying more than one form of PRA.

The presence of breed predispositions and the relatively high occurrence within the population suggests a genetic influence for canine distichiasis.

The number of breeding offspring from higher - risk parents should be limited, so that you avoid the possibility of multiplying a defective gene in the breeding population.

Main conclusion: «In the population studied, younger dogs, dogs of certain breeds and dogs that lived within a 73 km radius area had a significantly higher risk of angiostrongylosis.

As an aside, we may note that the interbreeding between Miniature Bull Terriers and Bull Terriers to save the former breed whilst a DNA test was developed for Primary Lens Luxation, has resulted in such increased genetic diversity in Miniatures that their effective population size is now high enough to be officially described as sustainable.

According to The Kennel Club Bull Terriers have an effective breed population of only 41.9, which means that it is at high risk of suffering detrimental effects of inbreeding.

Because the incidence of PLL is very high in some breeds, breeders should be cautious in eliminating carriers from the breeding population too quickly and thereby removing desirable traits and / or introducing unknown recessive defects into the population.

Los Angeles produces an extra high population of Chihuahuas and other «purse dogs» because the increased exposure created by Hollywood has produced a demand for these breeds.

The expected level of inbreeding assumes that breeding is random; the higher observed level indicates that the animals being bred together that are more closely related than the population average.

Exceptions might include a very high - frequency disease (CEA in Collies), a breed with a very low population or extremely tight gene pool, or a dog from very rare bloodlines.

California recently enacted a similar proposal, which is also working to end the practice of high - volume commercial breeding, which has led to the mistreatment of animals and increased shelter populations.

However, depending on the breed population structure in countries outside North America, the frequency of the mutation might be higher or lower.

It is seen in both purebred and mix - breed dogs, but some breeds, like the Aussie, have a much higher incidence than is seen in dogs as a whole, due to the restricted gene pool typical of any purebred population.

But in a country with a tiny breed population or where the population has a limited founder base and a high frequency of the HSF4 mutation, the national clubs in those places may need to develop a multi-generational plan for slowly reducing the frequency of the mutation.

Among the general dog population the incidence of cancer in older dogs may be no higher than other breeds, however early - onset cancers do seem to be more prevalent in Flat - Coats.

In addition, by eliminating some animals from breeding, a reduction in the effective population size will occur, thus risking higher levels of inbreeding, potential founder effects and genetic bottlenecks.

This is particularly important in rare breeds with a small or decreasing population size and for breeds predisposed to a high number of inherited disorders.

When a breed population carries a high frequency for a known detrimental allele at a specific genetic locus, it may be possible to crossbreed with an animal free of the detrimental allele and then backcross to the original lineage, monitoring the presence of the desired allele using genetic testing.

The whole period Ne was independent of census population size (as judged by mean annual registrations); some very numerous breeds had a small whole period Ne (e.g. English Springer Spaniel, mean annual registrations = 10,885.7, Ne = 45) while some much rarer breeds had a relatively high whole period Ne (e.g. Sealyham Terrier, mean annual registrations = 87.1, Ne = 111).

This indicates admixture between the Taymyr wolf population and the ancestral dog population of these 4 high - latitude breeds.

Naturally the populations of mosquitos are highest in the Southern states where there are a lot of the boggy areas where mosquitos breed.

The proportion of mixed - breed and subclassifications of purebred dogs for each of those conditions was determined to distinguish what specific backgrounds may contribute to the inherited conditions seen with higher prevalence in the purebred population or if in fact, purebreds as a whole were more at risk than the mixed - breed dogs.

The conditions of atopy / allergic dermatitis, hypothyroidism, and IVDD were more pervasive across the purebred population with many groups having higher prevalence than the mixed - breed population.

It is known that many individual breeds show a higher than expected frequency of some disorders [7 — 10] suggesting that the higher prevalence of those disorders may be restricted to discrete subsets of the purebred dog population.

Disorder counts, prevalence % (prev), and 95 % confidence interval (low and high) for inherited disorders between purebred dog categories and the mixed - breed dog population diagnosed over a 15 - year period

In comparing the purebred dog population to the mixed - breed dog population for ten inherited conditions found at a higher frequency in purebred dogs, the current data indicate that risk for certain inherited disorders can be apportioned to specific purebred populations.

Analyzing the prevalence of the conditions in subdivisions of the purebred population based upon the American Kennel Club classification of breed group or by relatedness at a DNA sequence level revealed that three conditions, atopy / allergic dermatitis, hypothyroidism, and intervertebral disk disease, were common across the purebred population with many of the purebred groups showing higher risk than the mixed - breed population.

For aortic stenosis, GDV, early onset cataracts, dilated cardiomyopathy, elbow dysplasia, epilepsy, and portosystemic shunt, most purebred groups were not statistically distinct from the mixed - breed population with higher prevalence in purebreds restricted to distinct subsets of purebred dogs.

This survey should provide an updated list of breeding sites, a good estimate of the size of the population, and data about survival rate of different age classes: together with the high resolution data from our intensive study of Sea Lion Island this new information should provide the parameters needed to determine the current status of the population and forecast its future.

More recent reports of high pup production (up to 5000 pups) and increase in colonies size seem unlikely: given the scarce breeding outside of Sea Lion Island, we think that the whole population size may be significantly smaller.

They breed strictly amongst their isolated community and at high rates, with no regard to population control.

Higher temperatures expand mosquitoes» populations and breeding ranges, and make it more probable that they will transmit disease from one person to the next.

To understand the population declines in high - elevation meadows on the Tahoe National Forest, I surveyed birds at several low - elevation breeding sites and examined the climate data from foothill weather stations.