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Year Published: 1994

The role of nutrient reserves for clutch formation by Northern Pintails in Alaska

We analyzed carcass composition of female Northern Pintails (Anas acuta) in Alaska to assess the importance of nutrient reserves for formation of first clutches (n = 85) and renests (n = 39). Habitat (tundra vs. boreal forest), hen age (yearling vs. adult), and year (1990 vs. 1991) did not affect nutrient reserve use. During formation of first...

Esler, Daniel N.; Grand, James B.

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Year Published: 1993

Dynamics and distribution of black abalone populations at San Nicolas Island

Dense populations of black abalones (Haliotis cracherodii Leach) were monitored in permanent intertidal plots at nine sites on San Nicolas Island from 1981 through 1990. Densities were essentially constant at all four sites along the north shore of the island throughout the study period. Densities at five sites along the south shore were more...

Hochberg, F.G.; VanBlaricom, Glenn R.
Dynamics and distribution of black abalone populations at San Nicolas Island; 1993; Article; Conference publication; Third California Islands Symposium: Recent Advances in research on the California Islands; VanBlaricom, Glenn R.

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Year Published: 1993

Factors influencing depredation of artificial duck nests

Because artificial nests can facilitate controlled experiments of nest success, we used them to assess whether human visitation, nest density, vegetation structure, and proximity to habitat edge could affect depredation of duck nests on Yukon Flats National Wildlife Refuge, Alaska. More (P < 0.01) nests in a plot visited daily (100%) were...

Esler, Daniel N.; Grand, James B.

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Year Published: 1992

Breeding chronology of mottled ducks in a Texas coastal marsh

The relationship between breeding chronology of Mottled Ducks (Anas fulvigula fulvigula) and wetland conditions at San Bernard National Wildlife Refuge was examined over a 3-yr period. Median nest initiation dates varied by as much as 68 d among years. Initiation occurred earlier in 1985 and 1987 versus 1986 (P < 0.05). Nesting initiation was...

Grand, James B.

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Year Published: 1987

Aggressive encounters between tundra swans and greater white-fronted geese during brood rearing

Interspecific aggression in waterfowl (Anatidae) is relatively common (McKinney 1965; Kear 1972; Savard 1982, 1984), but interactions leading to mortality of one of the combatants are rarely-observed in the wild. A recent debate (Livezey and Humphrey 1985a, 1985b; Nuechterlein and Storer 1985a, 1985b; Murray 1985) has centered on the proximate and...

Ely, Craig R.; Budeau, David A.; Swain, Una G.