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Number of projects found: 1092

Extra-pair paternity in the black-capped chickadee

1994

Studies of the mating strategies of birds are increasingly shifting their focus to the role that females take in controlling copulation (Hunter et al. 1993, Petrie 1992, Birkhead and Moller 1993). In some avian species, females appear able to control...

Genetic evidence for cuckoldry in bluegill Lepomis macrochirus

1994

In colonies of bluegill, some males provide parental care for broods in nests, whereas other males steal fertilizations and do not provide parental care. Using experimental pond populations of bluegill of known genotype (determined through protein electrophoresis), we demonstrate that...

Development of song in hand-reared black-capped chickadees

1993

Black-capped Chickadees (Parus atricapillus) sing a two-note tonal song that has stereotyped frequency parameters (glissando and frequency interval). We hand-reared and tutored pairs of nestlings in acoustic isolation to determine the extent that learning is involved in the production of...

Evolutionary processes in aquatic plant populations

1993

Here we ask whether the population structure, reproductive systems, gene flow and patterns of genetic differentiation in aquatic plant populations is best attempted using demographic and genetic techniques for estimating effective population size.

Pentachlorophenol and reduced food intake of bluegill

1993

During the final 10 d of a 22-d subchronic exposure of bluegills Lepomis macrochirus to a penta chlorophenol (PCP) concentration of 173 Mg/L, bluegill growth rate significantly decreased by 75% when compared with untreated controls, and food intake declined significantly...