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Category :
Languages : en
Pages : 22
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Overall, the nesting population of Great Basin Canada geese (Branta canadensis moffitti) on the Hanford Site in southcentral Washington State is doing well and appears to be increasing. The average annual total nests for the period 1981 through 1990 was 215 nests, which is slightly above the average reported for the period 1950 through 1970. The nesting population has shifted its nucleus from upriver islands (1--10) to the lower river islands (11--20) with over 70% of the present-day nesting occurring on Islands 17, 18, 19, 20. The annual percent-successful nests from 1981 through 1990 was 80%. This is above the 71% reported for 1950 to 1970, but is below the 82% reported for 1971 to 1980. Average annual clutch size for 1981 to 1990 was 6.05, which is above the 1971-to-1980 average of 5.6 and the 1950-to-70 average of 5.5. Next desertions for 1981 to 1990 averaged 8%. This rate is well below the 14% reported for 1950 to 1970. Predators were responsible for an annual predation rate of 9% from 1981 to 1990. This is below the 1950-to-1970 annual average predation rate of 14%. Flooding losses to nests were low during the 1980s, except for 1989 and 1990 when 6% and 9% of the total nests, respectively, were destroyed by flooding. 9 refs., 4 figs., 1 tab.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
Overall, the nesting population of Great Basin Canada geese (Branta canadensis moffitti) on the Hanford Site in southcentral Washington State is doing well and appears to be increasing. The average annual total nests for the period 1981 through 1990 was 215 nests, which is slightly above the average reported for the period 1950 through 1970. The nesting population has shifted its nucleus from upriver islands (1--10) to the lower river islands (11--20) with over 70% of the present-day nesting occurring on Islands 17, 18, 19, 20. The annual percent-successful nests from 1981 through 1990 was 80%. This is above the 71% reported for 1950 to 1970, but is below the 82% reported for 1971 to 1980. Average annual clutch size for 1981 to 1990 was 6.05, which is above the 1971-to-1980 average of 5.6 and the 1950-to-70 average of 5.5. Next desertions for 1981 to 1990 averaged 8%. This rate is well below the 14% reported for 1950 to 1970. Predators were responsible for an annual predation rate of 9% from 1981 to 1990. This is below the 1950-to-1970 annual average predation rate of 14%. Flooding losses to nests were low during the 1980s, except for 1989 and 1990 when 6% and 9% of the total nests, respectively, were destroyed by flooding. 9 refs., 4 figs., 1 tab.
Author: Richard L. Knight
Publisher:
ISBN:
Category : Canada goose
Languages : en
Pages : 230
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![Ecology of Great Basin Canada Goose Broods in Southcentral Washington [microform] PDF](https://books.google.com/books/content/images/frontcover/gSUmNAEACAAJ?fife=w80-h100)
Author: Eberhardt, Lester E. (Lester Earl)
Publisher: Ann Arbor, Mich. : University Microfilms International
ISBN:
Category : Canada goose
Languages : en
Pages : 186
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The ecology of female Great Basin Canada geese (Branta canadensis moffitti) and their broods was studied during the rearing seasons of 1983 and 1984 on the Columbia River in southcentral Washington. The movements and activities of 41 adult female geese, marked with radio-transmitters, and their broods were monitored. Adult female geese used an average of 8.8 ± 4.4 (1 SD) km of the Columbia River to raise their broods to fledging. Movement rates of broods were not significantly influenced by age of goslings or weather patterns. Broods were relatively inactive at night and most mobile during late-morning hours. During the prefledging period, feeding was the predominate activity of broods and adult females, involving approximately 54% and 45% of the daylight hours, respectively. The activity budgets of both adult females and their broods changed dramatically at fledging. Time spent in inactive states and preening increased, while movement and feeding activity decreased. Broods preferred terrestrial habitats within 5 m of the shoreline over aquatic habitats. A shoreline pasture that was fertilized and grazed by cattle was an important foraging habitat to local broods, but did not attract broods from surrounding areas. Broods that utilized this pasture spent less time moving and were inactive more than broods that utilized only native habitats. These differences may be related to the increased amount of time required for broods in native habitats to search for adequate foraging sites. However, the total time spent feeding and growth rates of broods in the two types of habitat did not appear to differ, suggesting that the quality and quantity of native forages were sufficient to meet nutritional needs of broods. Broods appeared to be most susceptible to human disturbance during the first few weeks following hatching, but older broods were relatively tolerant of repeated human disturbance. Fifteen (55.6%) of the 27 adult females, for which the fate of the brood could be determined, fledged at least one gosling. Daily survival rates of goslings, based on the Mayfield method, were significantly lower during the first 14 days of life (0.971), as compared to the rest of the 70-day rearing season (0.995). The overall estimated survival rate for goslings during the rearing season was 0.491 ± 0.008 (2 SE), which was considerably lower than that previously recorded for this species. The reasons for the apparent low survival are unknown, but may partially reflect the increased ability of radio-telemetry techniques, compared to other more commonly used techniques, to detect gosling mortality. The significance of the apparent low survival rate is also unknown; however, the resident nesting population was increasing during the study period.
Author:
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ISBN:
Category : Canada goose
Languages : en
Pages : 200
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Author: Alec Rickard
Publisher: Elsevier
ISBN: 0444599533
Category : Science
Languages : en
Pages : 285
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Owing to man-made intervention, the shrub-steppe now represents a rapidly disappearing landscape in the arid regions of North America. This book represents a systems-level study of ecological variables affecting water balance, and responses to perturbation. The study focused on a very large, protected, landscape unit, comprising a natural ``watershed'' area located in the semi-arid western United States. Long-term and concurrent data sets were established with a view towards establishing system-level responses to manipulative interventions, and natural perturbations like wildfire. These data sets were established for micrometeorology, climatology, mineral cycling in soils, nutrient and mineral pathways in springs and streams, vegetational dynamics, and population changes on the site. In synthesizing nearly twenty years of data, the more interesting ecosystem level responses concerned vegetational recovery and water balance. For instance, the synthesis uniquely demonstrates the interaction of biotic and non-biotic factors and their integrated effect on regional water balance. However, special attention was also paid to species diversity and the genetic resource pool represented at this site.This book will be of primary interest as a reference resource to land managers and wildlife specialists, and as a research study for scientists interested in systems-level ecology. Conservation-minded citizens who take more than a cursory interest in ecology will also find it interesting.
Author:
Publisher:
ISBN:
Category : Wildlife conservation
Languages : en
Pages : 432
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Author: Robert L. Jarvis
Publisher:
ISBN:
Category : Birds
Languages : en
Pages : 362
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Author:
Publisher: U of Minnesota Press
ISBN: 9781452900162
Category : Electronic books
Languages : en
Pages : 812
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Author: I. J. Ball
Publisher:
ISBN:
Category : Birds
Languages : en
Pages : 84
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Author: United States. Congress. Senate. Committee on Energy and Natural Resources. Subcommittee on Public Lands, National Parks, and Forests
Publisher:
ISBN:
Category : Wild and scenic rivers
Languages : en
Pages : 268
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