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Filter Total Items: 3521

Genetic variation in male Yellow-headed Blackbirds from the northern Great Plains Genetic variation in male Yellow-headed Blackbirds from the northern Great Plains

Electrophoretic differences at 15 presumptive loci were used to assess allelic frequencies, heterozygosities, and polymorphism for male Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) collected in east-central Alberta, north-central North Dakota, and east-central South Dakota. Five loci were polymorphic and mean heterozygosities ranged from 0.119 to 0.133. Significant...
Authors
Daniel J. Twedt, William J. Bleier, George M. Linz

Comparison of algorithms for replacing missing data in discriminant analysis Comparison of algorithms for replacing missing data in discriminant analysis

We examined the impact of different methods for replacing missing data in discriminant analyses conducted on randomly generated samples from multivariate normal and non-normal distributions. The probabilities of correct classification were obtained for these discriminant analyses before and after randomly deleting data as well as after deleted data were replaced using: (1) variable means...
Authors
Daniel J. Twedt, D.S. Gill

Disappearing coastal wetlands Disappearing coastal wetlands

No abstract available.
Authors
James B. Johnston, Donald W. Field, Anthony J. Reyer

Acute toxicity testing of sediments Acute toxicity testing of sediments

No abstract available.
Authors
Pasquale F. Roscigno, Arthur V. Stiffey, W. David Burke, Diane K. Arwood

[Book review] Life History and Ecology of the Slider Turtle, by J. W. Gibbons [Book review] Life History and Ecology of the Slider Turtle, by J. W. Gibbons

Review of: Life History and Ecology of the Slider Turtle. J. W. Gibbons. Smithsonian, 2000. ISBN: 1560982136.
Authors
C.K. Dodd

Biological diversity of a temporary pond herpetofauna in north Florida sandhills Biological diversity of a temporary pond herpetofauna in north Florida sandhills

From 1985 through 1990, the herpetofauna of a temporary pond in an uplands longleaf pine sandhills community in north-central Florida was monitored. A drift fence completely encircled the pond. Animals were captured in pitfall traps and marked as they entered and exited the pond basin. I captured 16 155 individuals of 42 species (16 amphibians, 26 reptiles). The species richness...
Authors
C.K. Dodd
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