Effects of research activities on nest predation in Arctic-nesting geese

Article Abstract:

Assessment of the effects of nest visits and research markers show no evidence that these affect nest success among the black brant and lesser snow geese at Anderson River Delta, Northwest Territories. The clutch size of intensely visited nests did not differ from control nests for both brant and snow goose except in late incubation, nor was there any difference in proportion in hatched nests between those nests with markers and without. Avian predators that follow ornithologists on nest visits can be avoided by conducting visits at night instead of daytime.

Research, Management, Predator control, Ecological research, Game protection, Geese

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Predation at Intermountain West fish hatcheries

Article Abstract:

The Intermountain West fish hatcheries have recorded significant stock losses due to predation. Bird species responsible for reduction of fish stocks are great blue herons, black-crowned night herons, ospreys and California gulls, while mammalian predators include feral cats, raccoons and striped skunks. Predation losses in the hatcheries has been estimated to range from 0.6% to 7% of annual production.

Economic aspects, Animal feeding and feeds, Fish hatcheries

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Vigilance, predation risk and the Allee effect in desert bighorn sheep

Article Abstract:

The Allee effect (inverse density dependence) in desert bighorn sheep in New Mexico is studied. The use of vigilance as a correlate of predation risk for assessing seasonal and class-specific vulnerability to predation is suggested.

Behavior, Study and teaching, Bighorn sheep

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