Search Results for Grand, Barry.

Decoy trapping and rocket-netting for northern pintails in spring.

2024-06-02T02:56:11Z

Grand, James Barry.
Content Time Period 1994.
Book

Productivity of nesting spectacled eiders on the lower Kashunuk River, Alaska.

2024-06-02T02:56:11Z

Grand, James B. (James Barry)
Content Time Period 1997.
Book

The Role of nutrient reserves for clutch formation by northern pintails in Alaska.

2024-06-02T02:56:11Z

Esler, Daniel.
Content Time Period 1994.
Book

Incubation behavior of spectacled eiders on the Yukon-Kuskokwim Delta, Alaska.

2024-06-02T02:56:11Z

Flint, Paul L.
Content Time Period 1999.
Book

Population dynamics of long-tailed ducks breeding on the Yukon-Kuskokwim Delta, Alaska.

2024-06-02T02:56:11Z

Schamber, Jason L.
Population estimates for long-tailed ducks in North America have declined by nearly 50% over the past 30 years. Life history and population dynamics of theis species are difficult to ascertain, becasue the birds nest at low densities across a broad range of habitat types. Between 1991 and 2004, we collected information on productivity and survival of long-tailed ducks at three locations on the Yukon-Kuskokwim Delta. Clutch size averaged 7.1 eggs, and nesting success averaged 30%. Duckling survival to 30 days old averaged 10% but was highly variable among years, ranging from 0% to 25%. Apparent annual survival of adult females based on mark-recapture of nesting females was estimated at 74%. We combined these estimates of survival and productivity into a matrix-based population model, which predicted an annual population decline of 19%. Elasticities indicated that population growth rate was most sensitive to changes in adult female survival. Further, the relatively high sensitivity of population growth rate to duckling survival suggests that low duckling survival may be a bottleneck to productivity in some years. THese data represent the first attempt to synthesize a population model for this species. Although our analyses were hampered by the small sample sizes inherent in studying a dispersed nesting species, our model provides a basis for management actions and can be enhanced as additional data become available.
Book

An Army of watchers.

2024-06-02T02:56:11Z

Hester, Nolan.
Content Time Period 1992
Book

Drama in an untamed ecosystem.

2024-06-02T02:56:11Z

Begley, Sharon.
Content Time Period 1999.
Book

Eyeballing eiders.

2024-06-02T02:56:11Z

Dunkel, Tom.
Content Time Period 1997.
Book

In search of spectacled eiders.

2024-06-02T02:56:11Z

O'Harra, Doug.
Content Time Period 1995
Book