R. Keen

发表

Allozymic variability in toxicity‐testing strains of ceriodaphnia dubia and in natural populations of Ceriodaphnia

T. P. Snyder, Kristen M. Switzer, R. Keen, 1991 .

Changes in the Lake Superior Crustacean Zooplankton Community

J. H. Selgeby, J. Link, R. Keen, 2004 .

Prey of Deep-water Hydra in Lake Superior

J. Link, R. Keen, 1995 .

A Probabilistic Approach to the Dynamics of Natural Populations of the Chydoridae (Cladocera, Crustacea)

R. Keen, 1973 .

Survival Rates of Myotis leibii and Eptesicus fuscus in Southeastern Ontario

A. Kurta, R. Keen, H. B. Hitchcock, 1984 .

Survival and Longevity of the Little Brown Bat (Myotis lucifugus) in Southeastern Ontario

R. Keen, H. B. Hitchcock, 1980 .

Toxicity to Daphnia of the end products of wet oxidation of phenol and substituted phenols

C. R. Baillod, R. Keen, 1985 .

Vertical migration, hatching rates, and distribution of egg stages in freshwater zooplankton

R. Keen, 1981 .

Effects of fluctuating temperature on duration on egg development of Chydorus sphaericus (Cladocera, Crustacea)

R. Keen, 1979 .

Population dynamics of the chydorid cladocera of a Southern Michigan Marl Lake

R. Keen, 1976, Hydrobiologia.

Confidence intervals for birth and death rates estimated with the egg-ratio technique for natural populations of zooplankton

R. Nassar, R. Keen, 1981 .

Characterization of organic extracts from standard reference materials 1649, 'urban dust/organics,' and 1650, 'diesel particulate matter', using a microsuspension assay. A WHO/IPCS/CSCM study.

S. Bagley, R. Keen, S. L. Stoltz, 1992, Mutation research.