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Year Published: 1999

Historical land cover changes in the Great Lakes Region

Two different methods of reconstructing historical vegetation change, drawing on General Land Office (GLO) surveys and fossil pollen deposits, are demonstrated by using data from the Great Lakes region. Both types of data are incorporated into landscape-scale analyses and presented through geographic information systems. Results from the two...

Sisk, Thomas D.; Cole, K.L.; Davis, M.B.; Stearns, F.; Guntenspergen, G.; Walker, K.
Historical land cover changes in the Great Lakes Region; 1999; Federal Government Series; Perspectives on the land use history of North America: A context for understanding our changing environment; Cole, K.L.; Davis, M.B.; Stearns, F.; Guntenspergen, G.; Walker, K.

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Year Published: 1999

Effects of wind turbines on upland nesting birds in Conservation Reserve Program grasslands

Grassland passerines were surveyed during summer 1995 on the Buffalo Ridge Wind Resource Area in southwestern Minnesota to determine the relative influence of wind turbines on overall densities of upland nesting birds in Conservation Reserve Program (CRP) grasslands. Birds were surveyed along 40 m fixed width transects that were placed along wind...

Leddy, K.L.; Higgins, K.F.; Naugle, D.E.
Effects of wind turbines on upland nesting birds in Conservation Reserve Program grasslands; 1999; Article; Journal; Wilson Bulletin; Leddy, K. L.; Higgins, K. F.; Naugle, D. E.

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Year Published: 1998

Radiotelemetry to determine exposure and effects of organophosphorus insecticides on sage grouse

Brewer, Larry; Fagerstone, Kathleen; Blus, L.J.; Connelly, J.W.
Radiotelemetry to determine exposure and effects of organophosphorus insecticides on sage grouse; 1998; Book chapter; Radiotelemetry applications for wildlife toxicology field studies: Proceeding of the Pellston workshop on avian radiotelemetry in support of pesticide field studies, January 5-8, 1993; Blus, L.J.; Connelly, J.W.

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Year Published: 1998

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-...

Flint, Paul L.; Grand, James B.; Rockwell, Robert F.
A model of northern pintail productivity and population growth rate; 1998; Article; Journal; Journal of Wildlife Management; Flint, P. L.; Grand, J. B.; Rockwell, R. F.

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Year Published: 1997

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...

Grand, James B.; Flint, Paul L.; Heglund, Patricia J.

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Year Published: 1997

Proximate composition and energy density of some North Pacific forage fishes

Mature pelagic forage fish species (capelin, sand lance, squid) had greater lipid concentrations than juvenile age-classes of large demersal and pelagic fish species (walleye pollock, Pacific cod, Atka mackerel, greenling, prowfish, rockfish, sablefish). Myctophids preyed on by puffins have at least twice as much lipid per gram compared to mature...

van Pelt, Thomas I.; Piatt, John F.; Lance, Brian K.; Roby, Daniel D.

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Year Published: 1996

Nesting success of Northern Pintails on the coastal Yukon-Kuskokwim Delta, Alaska

We studied nesting chronology and success of Northern Pintails (Anas acuta) on the coastal Yukon-Kuskokwim Delta, Alaska during the summers of 1991-1993. We found a total of 795 nests during three annual searches of a 27.4 km2 area. Minimum nest density averaged 9.67 nests per km2. Nesting success varied among years and ranged from 43.12% in 1991...

Flint, Paul L.; Grand, James B.

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Year Published: 1996

Renesting ecology of northern pintails on the Yukon-Kuskokwim Delta, Alaska

We used radio telemetry to study renesting by wild, free-ranging Northern Pintails (Anas acuta) on the coastal Yukon-Kuskokwim Delta in 1994 and 1995. Fifty-six percent of females (n = 39) renested at least once. Propensity to renest declined among females that initiated later first nests. Renesting interval was not related to female weight, year...

Grand, James B.; Flint, Paul L.

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Year Published: 1996

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...

Grand, James B.; Flint, Paul L.

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Year Published: 1996

Variation in egg size of the northern pintail

Egg size is an important determinant of reproductive investment by birds. For many species, total investment in a clutch is limited by the size of stored reserves (Ankney and MacInnes 1978, Esler and Grand 1994a). Egg size determines the unit by which these stored reserves are partitioned. Individual females in most species of waterfowl show a...

Flint, Paul L.; Grand, James B.

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Year Published: 1995

Estimating number of species and relative abundances in stream-fish communities: effects of sampling effort and discontinuous spatial distributions

We sampled fishes and measured microhabitat in series of contiguous habitat units (riffles, runs, pools) in three Virginia streams. We used Monte Carlo simulations to construct hypothetical series of habitat units, then examined how number of species, similarity in relative abundances, and number of microhabitats accumulated with increasing number...

Angermeier, Paul L.; Smogor, Roy A.

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Year Published: 1995

Monitoring exposure of nestling songbirds to agricultural application of an organophosphorus insecticide using cholinesterase activity

In June 1992 we collected 53 blood plasma samples from nestling red‐winged blackbirds (Agelaius phoeniceus), house sparrows (Passer domesticus), and brown‐headed cowbirds (Molothrus ater) at five study sites in northwestern Minnesota to evaluate the feasibility of using plasma and brain cholinesterase (ChE) activity and reactivation as a means of...

McInnes, Pamela F.; Andersen, David E.; Hoff, Dale J.; Hooper, Michael J.; Kinkel, L.K.