Local blackbird populations cause most of the damage to sunflower crops in North Dakota. Precise estimates of blackbird breeding populations are necessary before management practices designed to ...

A new telephone survey experiment finds that, despite major structural differences, an opinion poll drawn from a commercial voter file can produce results similar to those from a sample based on ...

This is a preview. Log in through your library . Abstract Although mark-resight methods can often be a less expensive and less invasive means for estimating abundance in long-term population ...