Increasing breeding success of an Endangered penguin: artificial nests or culling predatory gulls?

Do artificial nests simulate nest success of greater sage-grouse?

Artificial nests have been used to study factors affecting nest success because researchers can manipulate them more than natural bird nests. Many researchers have questioned the validity of generalizing the results from artificial nests onto naturally occurring nests. Other studies have assessed the validity of artificial nest studies by simultaneously comparing overall depredation or daily su...

Suitability of artificial nests.

Evaluation of environmental factors to predict breeding success of Black-tailed Gulls

Article history: Received 15 February 2005 Received in revised form 9 April 2005 Accepted 12 April 2006 This study demonstrated prediction of breeding success of Black-tailed Gulls in relation to the selected environmental factors through evaluation of relative importance in determining breeding success. The data were obtained from the 258 selected and 120 non-selected sites for breeding of the...

Livestock grazing and trampling of birds’ nests: an experiment using artificial nests

The purpose of this study is to experimentally determine the differences between four grazing treatments on the trampling of nests. Additionally, we examine to what extent the trampling probability of nests is higher close to a source of fresh water. We compare the trampling of artificial nests in five different grazing treatments in an experimental design. We use buried clay pigeon targets as ...

Reproductive Declines in an Endangered Seabird: Cause for Concern or Signs of Conservation Success?

Collection and analysis of demographic data play a critical role in monitoring and management of endangered taxa. I analyzed long-term clutch size and fledgling productivity data for California least tern (Sternula antillarum browni), a federally endangered subspecies that has recently become a candidate for down-listing. While the breeding population grew from approximately 1,253 to 7,241 pair...