Sentences with phrase «do predator populations»

As prey populations fall, so do predator populations.

Not exact matches

That did not happen: there is no geological record of a world - wide flood, there is not enough diversity to regenerate the population we currently, there is not enough water to cover the earth to the height of Everest, the logistics of retrieving and returning animals to the then - unknown Americas, Australia, etc. were staggeringly difficult, managing the animals on the Ark was impossible — a few humans keeping predators from their prey, cleaning the waste, etc., pretty much all life on earth would have been killed, etc. etc..

I mean, not every zebra of course have, [having] seen many lions eating zebras — but enough zebras do survive, so that their population continues on and that's pretty much the same down with human beings there, though of course in recent years it has gotten a little more challenging because we've become much more cunning and technologically empowered predators than we were before.

The problem is that we don't know how much damage the predators do during winter, when the lemming population grows fastest, as, unsurprisingly, researchers do most of their field studies in the summer.

«Monkeys are cute, but can devastate systems that don't have the proper predators or other ecological means to keep their populations in check,» said Jane Anderson, a doctoral student in wildlife ecology and the lead author on this study.

The many marine animals that depend on them would lose their food source, predator fish populations would fall and the effects would likely ripple throughout the entire food web, hurting organisms that don't even rely on those fish directly.

Not only do we kill other animals at much higher rates than other predators, but our ability to bring down larger adults can make it very difficult for some prey populations to recover.

More ominously, the scientists warn that, «If we do nothing, endocrine disruptors may not only impact on human health but all the ecosystems including those on which we depend — if we compromise soil productivity and sustainability of our agricultural systems or cause imbalance in marine and freshwater ecosystems through damage to populations of top predators, ultimately, we threaten our own survival.»

Studies show that the animals caught by predators are generally weaker and more diseased than those killed by manmade sources.6, 7 One study found that «birds killed by cats had significantly lower mass, fat scores, and pectoral muscle mass scores» than birds of the same species killed by cars or windows.8 These studies indicate that cats are catching what some biologists refer to as the «doomed surplus» 9 — animals who would not have lived, and so whose death does not affect overall population levels.

And if you put a few things together, like a fire regime that doesn't help cats, a population of dingoes that hinders cats and maybe minimal livestock grazing that also means there's plenty of cover on the ground for small mammals to get refuge from predators, then we could allow cats and small mammals to co-exist.

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

That is, the habitat does not govern population dynamics — the carrying capacity is never strained — because predators eat the prey down to a fraction of the carrying capacity.

«Habitat» set asides almost never affect wildlife populations, whereas manipulations of predator / prey relationships almost always do.

Raising high - energy, warm - blooded predators that can swim 40 miles an hour, like the bluefin tuna, just doesn't feel right for a global population headed toward nine billion people.

Peer - reviewed science does not support the claim that recreational hunting or trapping effectively reduces livestock - predator conflicts or boosts ungulate populations.

Assuming we can cause it to warm, increase the Hare population, what do the predators have to say about that?

«In a predator - prey cycle, such as mice and weasels or hares and lynx, the reason why populations go through periodic booms and busts has nothing to do with any external clocks,» he writes.»

It's unclear whether or not climate change has anything to do with the latest offensive, but scientists say that the increased jellyfish populations are indicative of changing ocean conditions: warmer water, and fewer predators due to overfishing.

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.