The movements of P. leucopus in small island populations were studied by means of nightly smoked-paper tracking supple- mented by occasional livetrapping. The mice left enough track records on nights when trapped to show that they often do not enter...
The exploration of new objects and new environments by Peromyscus leucopus was observed in laboratory pens and inferred from the number of smoked paper track records obtained from track shelters (milk cartons or tin cans) in the field. The exploration...
In 14 cohabiting fish species in a small freshwater lake, mouth and body structures combine with food specializations and habitat preferences to greatly restrict interspecific competition within the fauna.The species differ quantitatively in a large number of structures and, individually...
A description is given of a rare soil disease, called "barren ring", which occurs in some old, deserted pastures. It is an expanding ring-shaped area of diameter up to 17 meters in which the vegetation is killed. Regeneration of normal...
Movements of island populations of deer mice were studied by smoked paper tracking supplemented by live trapping. Some mice tracked regularly, others rarely. Some stations were tracked much more than others. The number of track records per night varied greatly...
Lake Opinicon in southeastern Ontario contains 57 islands.In 1963 deer mice were found on 20 of these, in populations of one to 50. Fewer islands had mice in 1964,but two of these had much higher populations than in 1963. Mice...
Colonies of mice, Peromyscus leucopus, often began to breed soon after being introduced to previously uninhabited islands in midsummer, although natural populations were not breeding at this season. This breeding began when population densities were higher than those of...
The sediments deposited beneath the thermocline in certain lakes are finely banded with alternating dark and light bands. Most workers have assumed this banding to be an annual phenomenon, with the light bands representing summer deposits and the dark bands...
Principles of fluid mechanics are used to interpret the structures in high-grade metamorphic rocks which behaved like viscous fluids and thus were deformed by nonuniform laminar flow. The structures investigated are in a typical Grenville assemblage of gneisses, marbles, and...
During 1960 and 1961 we studied periodically flooded wetlands dominated by the trees Larix laricina, Thuja accidentalis, and Ulmus americana along transects from lake margins to the upland in the Rideau Lakes Region of Ontario. This vegetation shows distinct belts...
We wished to determine if such a vegetational continuum could be derived not only from a non-spatial correlation of stands but instead from plant presence and importance measured along definite environmental gradients. We wanted to find, through a quantitative study...
An incidence of 31.8 percent infection with botflies (Cuterebra sp.) was found in a population of deer mice (Peromyscus leucopus noveboracensis) trapped near the Queen's University Biological Station, Chaffey's Locks, Ontario, during July and August 1958. No...
Quantitative data are presented on ninhydrin-reacting substances in hydrolysates and extracts of Recent sediments, sedimentary rocks, and fossils, as determined by column chromatography. The recovery of amino acids added in small amounts to a concentrated calcium chloride solution was found...
A semi‐quantitative method is described for the determination of free sugars in lake sediments. The method involves extraction with 70% ethanol, deionization with ion exchange resins, and separation and estimation of the sugars on paper chromatograms. The following sugars were...
Measures of physiological response of northern largemouth bass to various temperatures were taken to ascertain the degree of adaptation of the bass to its environment. These measures include hemoglobin, red-cell count, arterial blood oxygen, oxygen capacity, and lactic acid. The amount...
A modification of the Livingstone piston sampler is described. The sampler employs the piston feature of the Livingstone device in conjunction with the rod and locking mechanism of the Davis borer. The sampler is used in different ways for loose...
Populations of the adult insects which emerged from Lake Opinicon, Ontario, were sampled by emergence traps from July 1-11, 1951. The average daily emergence per square meter of lake surface was 136 insects which had a fresh weight of 69.2...
