Sentences with phrase «controlled predator populations»

Not exact matches

Predator prey relationship, and death is how nature controls population

Although insecticides are used to some extent, their use is mitigated through the introduction of predator insects to control the populations of insects that could damage fruit.

Biological pest control on organic farms, for example, relies on maintaining healthy populations of pest predators and parasitoids.

Though wolves are on the upswing in these regions, their populations are likely too isolated to control the pervasive coyote and other small predators.

But the pattern suggests that these natural population controls could be a defining feature of top predators, the authors argue online this month in Oikos.

Gatenby calls this strategy an evolutionary double bind, and he explains it like this: imagine trying to control a population of rats by introducing predators, such as hawks, that can pick them off from the sky.

Its problems have not gone away, and the population is now inbred, but a combination of measures including a captive breeding programme, habitat restoration and predator control are building up numbers.

It may be that in some areas, the most important drivers of tick abundance are the factors that control small mammal populations, including their food supply and predators, Kilpatrick said.

And unlike other successful invaders, like tiger shrimp, lionfish have no natural predators to keep populations under control.

Birds play an important role in a wide variety of ecosystems as both predator and prey, in controlling insect populations, pollinating and seed dispersal for many plants, and in releasing nutrients on to land and sea in the form of guano.

Darwin Vest, who considered pesticides an irresponsible way to control spiders, examined the question of what predators might naturally control hobo populations.

The Black - footed Ferret has been listed as an endangered species since 1967; more than a half century of misguided predator control campaigns and efforts to eradicate prairie dogs from farm and ranch land decimated the population.

During the first half of the 20th century, misguided predator control campaigns and efforts to eradicate prairie dogs from farm and ranch land decimated the population.

Specification points covered are: Paper 2 Topic 1 (4.5 - homeostasis and response) 4.5.1 - Homeostasis (B5.1 lesson) 4.5.3.2 - Control of blood glucose concentration (B5.1 lesson) 4.5.2.1 - Structure and function (B5.2 lesson) Required practical 7 - plan and carry out an investigation into the effect of a factor on human reaction time (B5.2 lesson) 4.5.3.1 - Human endocrine system (B5.6 lesson) 4.5.3.4 - Hormones in human reproduction (B5.10 lesson) 4.5.3.5 - Contraception (B5.11 lesson) 4.5.3.6 - The use of hormones to treat infertility (HT only)(B5.12 lesson) 4.5.3.7 - Negative feedback (HT only)(B5.13 lesson) Paper 2 topic 2 (4.6 - Inheritance, variation and evolution) 4.6.1.1 - sexual and asexual reproduction (B6.1 lesson) 4.6.1.2 - Meiosis (B6.1 lesson) 4.6.1.4 - DNA and the genome (B6.3 lesson) 4.6.1.6 - Genetic inheritance (B6.5 lesson) 4.6.1.7 - Inherited disorders (B6.6 lesson) 4.6.1.8 - Sex determination (B6.5 lesson) 4.6.2.1 - Variation (B6.9 lesson) 4.6.2.2 - Evolution (B6.10 lesson) 4.6.2.3 - Selective breeding (B6.11 lesson) 4.6.2.4 - Genetic engineering (B6.11 lesson) 4.6.3.4 - Evidence for evolution (B6.16 lesson) 4.6.3.5 - Fossils (B6.16 lesson) 4.6.3.6 - Extinction (B6.16 lesson) 4.6.3.7 - Resistant bacteria (B6.17 lesson) 4.6.4.1 - classification of living organisms (B6.18 lesson) Paper 2 topic 3 (4.7 - Ecology 4.7.1.1 - Communities (B7.1 lesson) 4.7.1.2 - Abiotic factors (B7.1 lesson) 4.7.1.3 - Biotic factors (B7.1 lesson) 4.7.1.4 — Adaptations (B7.2 lesson) 4.7.2.1 - Levels of organisation (feeding relationships + predator - prey cycles)(B7.3 lesson) 4.7.2.1 - Levels of organisation (required practical 9 - population sizes)(B7.4 lesson) 4.7.2.2 - How materials are cycled (B7.5 lesson) 4.7.3.1 - Biodiversity (B7.7 lesson) 4.7.3.6 - Maintaining Biodiversity (B7.7 lesson) 4.7.3.2 - Waste management (B7.9 lesson) 4.7.3.3 - Land use (B7.9 lesson) 4.7.3.4 - Deforestation (B7.9 lesson) 4.7.3.5 - Global warming (B7.9 lesson)

By «regulating» smaller predators like foxes, raccoons, skunks, badgers, and opossums through competition and direct killing, they have a significant positive impact on rodent control and water fowl / songbird populations.

This coincided with an upsurge in the coyote population in the American West and a movement to use guardian dogs for predator control instead of poison and other methods that had not been effective.

2 as predators coyotes keep rhodent populations under control - in equilibrium if you will.They cull out the weak and sick, hard on individuals but so good for the herd (see esp.

However, when they are introduced to a new community, they may no longer have natural predators or controls on their population growth.

These studies suggest that ecosystems suffer when predators do not help control populations, and the consequences are vast.

Using a native predator to control the population of an invasive species is key, as it avoids the pitfalls inherent in introducing a foreign species — the very pitfalls that led to the cane toad outbreak in the first place.

Some massive outbreaks of destructive insects are controlled because the population of their predators increases (due to an abundant supply of food).

Most introduced species are not able to do so, but a small percentage can, benefiting from the lack of natural controls like predators, competition, and climate fluctuations that would otherwise keep their populations in check.

They occur in high numbers and their own predators, such as feral cats, do not have much effect on controlling possum population size.