are of current interest because of their high incidence in hatchery-grown trout (3, 6, 10, 15—18,21, 22) and because of indications that the cotton seed meal component of the hatchery diets contains the carcinogen (7, 21). The susceptibility of rainbow trout to dietary carcino gens could make that species useful as a detector of envir onmental carcinogens, but most rainbow trout popu lations ...

The genetic impacts of hybridization between native and introduced species are of considerable conservation concern, while the possibility of reticulate evolution affects our basic understanding of how species arise and shapes how we use genetic data to understand evolutionary diversification. By using mitochondrial NADH dehydrogenase subunit 2 (ND2) sequences and 467 amplified fragment-length ...

The ecomorphology of 10 insectivorous bat species at three study zones in western Madagascar was examined using 567 specimens and based on 6 external, 11 cranial, 12 dental, and 11 wing measurements. The three study sites are located along a cline representing 11.61 of latitude. The southern most site has notable differences in vegetational and climatic regimes than the two more northern sites....

The present study investigated GnRH forms within the brain of a representative of the order Cypriniformes, the white sucker, Catostomus commersoni, using HPLC, RIA, and immunocytochemistry. Several immunoreactive (ir) GnRH forms were identified in the brain of the white sucker by chromatography and radioimmunoassay, including ir-salmon GnRH, ir-lamprey GnRH-I and -III, and ir-chicken GnRH-II. R...