Paul Flint, Ph.D. (Former Employee)
Science and Products
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Filter Total Items: 133
Effect of lead poisoning on spectacled eider survival rates
Spectacled eider (Somateria fischeri) populations on the Yukon-Kuskokwim Delta (Y-K Delta), Alaska, declined rapidly through the 1980s, and low adult female survival was suggested as the likely cause of the decline. We used mark-resighting techniques to study annual survival rates of adult female spectacled eiders at 2 sites on the Y-K Delta during 1993-96. Our data suggest survival rates may diff
Authors
J. Barry Grand, Paul L. Flint, Margaret R. Petersen, Christine L. Moran
A model of northern pintail productivity and population growth rate
Our objective was to synthesize individual components of reproductive ecology into a single estimate of productivity and to assess the relative effects of survival and productivity on population dynamics. We used information on nesting ecology, renesting potential, and duckling survival of northern pintails (Anas acuta) collected on the Yukon-Kuskokwim Delta (Y-K Delta), Alaska, 1991-95, to model
Authors
Paul L. Flint, J. Barry Grand, Robert F. Rockwell
Blood lead concentrations of spectacled eiders near the Kashunuk River, Yukon Delta National Wildlife Refuge, Alaska
We collected, 342 blood samples from spectacled eiders (Somateria fischeri) on their breeding grounds in western Alaska from late May through to early August 1993–1995. Lead concentrations of ≥0.50 p.p.m. wet weight were found in the blood of 20% of the adult female eiders, 2% of the adult males and 6% of the ducklings. Lead was detected (≥0.02 p.p.m.) more frequently in the blood of adult females
Authors
J. Christian Franson, Margaret R. Petersen, Lynn H. Creekmore, Paul L. Flint, Milton R. Smith
Survival of spectacled eider adult females and ducklings during brood rearing
We studied survival of adult female and duckling spectacled eiders (Somateria fischeri) during brood rearing on the Yukon-Kuskokwim Delta, Alaska from 1993 to 1995. Duckling survival to 30 days of age averaged 34% with a 95% confidence interval from 25 to 47%. Half (49%) of radiomarked adult females had lost all their ducklings by 30 days after hatch. Most (74%) duckling mortality occurred in the
Authors
Paul L. Flint, J. Barry Grand
Habitat use by nesting and brood rearing northern pintails on the Yukon-Kuskokwim Delta, Alaska
We studied habitat use by nesting and brood-rearing northern pintails (Anas acuta) on the coastal Yukon-Kuskokwim (Y-K) Delta, 1991-93. We used a digital habitat map constructed from color infrared aerial photos to assign habitat types to nest and brood locations and estimate habitat availability. Sixty-nine percent of females nested on slough banks in highly saline, tidally influenced habitats wh
Authors
J. Barry Grand, Paul L. Flint, Patricia J. Heglund
Variation in incubation periods and egg metabolism in mallards: Intrinsic mechanisms to promote hatch synchrony
We investigated factors affecting incubation time and metabolic rates of Mallard (Anas platyrhynchos) eggs incubated under constant environmental conditions. Time required to reach the star-pipped stage of hatch varied significantly among females, but not with laying sequence or egg size. Metabolic rate of eggs varied positively with position in the laying sequence and tended to vary among females
Authors
Margaret C. MacCluskie, Paul L. Flint, James S. Sedinger
Exposure of Spectacled Eiders and other diving ducks to lead in western Alaska
Lead poisoning, resulting from ingestion of spent shot, has been identified as a cause of mortality in Spectacled Eiders (Somateria fischeri) on the Yukon–Kuskokwim Delta, Alaska. We examined lead-exposure rates of adult and juvenile Spectacled Eiders and other diving ducks, using atomic absorption spectrophotometry of blood samples. Additionally, we X-rayed birds in the field to identify ingested
Authors
Paul L. Flint, Margaret R. Petersen, J. Barry Grand
Persistence rates and detection probabilities of oiled king eider carcasses on St Paul Island, Alaska
Following an oil spill off St Paul Island, Alaska in February 1996, persistence rates and detection probabilities of oiled king eider (Somateria spectabilis) carcasses were estimated using the Cormack-Jolly-Seber model. Carcass persistence rates varied by day, beach type and sex, while detection probabilities varied by day and beach type. Scavenging, wave action and weather influenced carcass pers
Authors
A. C. Fowler, Paul L. Flint
Effects of spring environment on nesting phenology and clutch size of Black Brant
We studied the effects of timing of spring snowmelt on nesting phenology, nest site selection, and clutch size of Black Brant (Branta bernicla nigricans) breeding at the Tutakoke river colony, Yukon-Kuskokwim Delta, Alaska. In late springs, brant nested later: however, time between peak arrival at Tutakoke and nest initiation (6 to 12 days) was similar in early and late springs. Nest initiation wa
Authors
M. S. Lindberg, J.S. Sedinger, Paul L. Flint
Productivity of nesting spectacled eiders on the lower Kashunuk River, Alaska
We studied the chronology and success of nesting Spectacled Eiders (Somateria fischeri) along the lower Kashunuk River on the Yukon-Kuskokwim Delta from 1991-1995. Nest initiation dates ranged from 16 May-22 June. Median nest initiation dates were correlated with the break-up of ice on the Kashunuk River. Clutch sizes declined seasonally, and mean clutch size varied among years ranging from 4.8-5.
Authors
J.B. Grand, Paul L. Flint
Survival of northern pintail ducklings on the Yukon-Kuskokwim Delta, Alaska
We studied survival rates of Northern Pintail (Anas acuta; hereafter pintail) broods and ducklings along the lower Kashunuk River on the Yukon-Kuskokwim Delta, Alaska. Survival rates were determined for 770 ducklings in 111 broods. Brood sizes at hatch were smaller in 1993 versus 1991 and 1992. Duckling survival rates were lower than those reported in previous studies and differed among years. Sur
Authors
J. Barry Grand, Paul L. Flint
Allocation of limited reserves to a clutch: A model explaining the lack of a relationship between clutch size and egg size
Lack (1967, 1968) proposed that clutch size in waterfowl is limited by the nutrients available to females when producing eggs. He suggested that if nutrients available for clutch formation are limited, then species producing small eggs would, on average, lay more eggs than species with large eggs. Rohwer (1988) argues that this model should also apply within species. Thus, the nutrition-limitation
Authors
Paul L. Flint, J. Barry Grand, James S. Sedinger
Science and Products
Filter Total Items: 17
No Result Found
Filter Total Items: 133
Effect of lead poisoning on spectacled eider survival rates
Spectacled eider (Somateria fischeri) populations on the Yukon-Kuskokwim Delta (Y-K Delta), Alaska, declined rapidly through the 1980s, and low adult female survival was suggested as the likely cause of the decline. We used mark-resighting techniques to study annual survival rates of adult female spectacled eiders at 2 sites on the Y-K Delta during 1993-96. Our data suggest survival rates may diff
Authors
J. Barry Grand, Paul L. Flint, Margaret R. Petersen, Christine L. Moran
A model of northern pintail productivity and population growth rate
Our objective was to synthesize individual components of reproductive ecology into a single estimate of productivity and to assess the relative effects of survival and productivity on population dynamics. We used information on nesting ecology, renesting potential, and duckling survival of northern pintails (Anas acuta) collected on the Yukon-Kuskokwim Delta (Y-K Delta), Alaska, 1991-95, to model
Authors
Paul L. Flint, J. Barry Grand, Robert F. Rockwell
Blood lead concentrations of spectacled eiders near the Kashunuk River, Yukon Delta National Wildlife Refuge, Alaska
We collected, 342 blood samples from spectacled eiders (Somateria fischeri) on their breeding grounds in western Alaska from late May through to early August 1993–1995. Lead concentrations of ≥0.50 p.p.m. wet weight were found in the blood of 20% of the adult female eiders, 2% of the adult males and 6% of the ducklings. Lead was detected (≥0.02 p.p.m.) more frequently in the blood of adult females
Authors
J. Christian Franson, Margaret R. Petersen, Lynn H. Creekmore, Paul L. Flint, Milton R. Smith
Survival of spectacled eider adult females and ducklings during brood rearing
We studied survival of adult female and duckling spectacled eiders (Somateria fischeri) during brood rearing on the Yukon-Kuskokwim Delta, Alaska from 1993 to 1995. Duckling survival to 30 days of age averaged 34% with a 95% confidence interval from 25 to 47%. Half (49%) of radiomarked adult females had lost all their ducklings by 30 days after hatch. Most (74%) duckling mortality occurred in the
Authors
Paul L. Flint, J. Barry Grand
Habitat use by nesting and brood rearing northern pintails on the Yukon-Kuskokwim Delta, Alaska
We studied habitat use by nesting and brood-rearing northern pintails (Anas acuta) on the coastal Yukon-Kuskokwim (Y-K) Delta, 1991-93. We used a digital habitat map constructed from color infrared aerial photos to assign habitat types to nest and brood locations and estimate habitat availability. Sixty-nine percent of females nested on slough banks in highly saline, tidally influenced habitats wh
Authors
J. Barry Grand, Paul L. Flint, Patricia J. Heglund
Variation in incubation periods and egg metabolism in mallards: Intrinsic mechanisms to promote hatch synchrony
We investigated factors affecting incubation time and metabolic rates of Mallard (Anas platyrhynchos) eggs incubated under constant environmental conditions. Time required to reach the star-pipped stage of hatch varied significantly among females, but not with laying sequence or egg size. Metabolic rate of eggs varied positively with position in the laying sequence and tended to vary among females
Authors
Margaret C. MacCluskie, Paul L. Flint, James S. Sedinger
Exposure of Spectacled Eiders and other diving ducks to lead in western Alaska
Lead poisoning, resulting from ingestion of spent shot, has been identified as a cause of mortality in Spectacled Eiders (Somateria fischeri) on the Yukon–Kuskokwim Delta, Alaska. We examined lead-exposure rates of adult and juvenile Spectacled Eiders and other diving ducks, using atomic absorption spectrophotometry of blood samples. Additionally, we X-rayed birds in the field to identify ingested
Authors
Paul L. Flint, Margaret R. Petersen, J. Barry Grand
Persistence rates and detection probabilities of oiled king eider carcasses on St Paul Island, Alaska
Following an oil spill off St Paul Island, Alaska in February 1996, persistence rates and detection probabilities of oiled king eider (Somateria spectabilis) carcasses were estimated using the Cormack-Jolly-Seber model. Carcass persistence rates varied by day, beach type and sex, while detection probabilities varied by day and beach type. Scavenging, wave action and weather influenced carcass pers
Authors
A. C. Fowler, Paul L. Flint
Effects of spring environment on nesting phenology and clutch size of Black Brant
We studied the effects of timing of spring snowmelt on nesting phenology, nest site selection, and clutch size of Black Brant (Branta bernicla nigricans) breeding at the Tutakoke river colony, Yukon-Kuskokwim Delta, Alaska. In late springs, brant nested later: however, time between peak arrival at Tutakoke and nest initiation (6 to 12 days) was similar in early and late springs. Nest initiation wa
Authors
M. S. Lindberg, J.S. Sedinger, Paul L. Flint
Productivity of nesting spectacled eiders on the lower Kashunuk River, Alaska
We studied the chronology and success of nesting Spectacled Eiders (Somateria fischeri) along the lower Kashunuk River on the Yukon-Kuskokwim Delta from 1991-1995. Nest initiation dates ranged from 16 May-22 June. Median nest initiation dates were correlated with the break-up of ice on the Kashunuk River. Clutch sizes declined seasonally, and mean clutch size varied among years ranging from 4.8-5.
Authors
J.B. Grand, Paul L. Flint
Survival of northern pintail ducklings on the Yukon-Kuskokwim Delta, Alaska
We studied survival rates of Northern Pintail (Anas acuta; hereafter pintail) broods and ducklings along the lower Kashunuk River on the Yukon-Kuskokwim Delta, Alaska. Survival rates were determined for 770 ducklings in 111 broods. Brood sizes at hatch were smaller in 1993 versus 1991 and 1992. Duckling survival rates were lower than those reported in previous studies and differed among years. Sur
Authors
J. Barry Grand, Paul L. Flint
Allocation of limited reserves to a clutch: A model explaining the lack of a relationship between clutch size and egg size
Lack (1967, 1968) proposed that clutch size in waterfowl is limited by the nutrients available to females when producing eggs. He suggested that if nutrients available for clutch formation are limited, then species producing small eggs would, on average, lay more eggs than species with large eggs. Rohwer (1988) argues that this model should also apply within species. Thus, the nutrition-limitation
Authors
Paul L. Flint, J. Barry Grand, James S. Sedinger
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