Sentences with phrase «cat densities estimated»

Not exact matches

Densities of cats were highly variable over time, showing strong annual fluctuations over 14 years of records Three independent estimates of peak density were made, varying between 1.5 and 2.8 km — 2.

In North America Coleman and Temple (1996) developed estimates of cat densities in Wisconsin and associated mortality of 8 — 217 million birds per year.

But, for instance, the densities of rats in Baltimore alleys prowled by feral cats is «remarkably stable,» according to research conducted in 2004 which compared rat and cat estimates from a half century earlier.

Estimates of cat population densities range from 0.03 to 4.7 cats per square kilometre in relatively unmodified and pastoral landscapes, and from 0.7 to 800 cats per square kilometre in highly modified landscapes, such as rubbish dumps.

Mean predation rates within each square each season were multiplied by cat density to estimate the total number killed, and summed across seasons to estimate the number killed annually.

We've been able to come up with good estimates of their density across the landscape, and we've been able to find out how some of the tools that we have at our disposal like fire management and removal of feral herbivores, how those tools affect the hunting abilities of cats.

Filled areas represent bands of different cat densities, on the basis of the number of captures in different trap lines (see text for procedure used to estimate area sampled for determination of densities).