THE DICTYATE OOCYTE OF MICROTUS MONTANUS

Chemical triggering of reproduction in Microtus montanus.

In a replicated experiment, nonbreeding winter populations of Microtus montanus were given supplements of rolled oats coated with 6-methoxybenzoxazolinone, a naturally occurring plant derivative. After 3 weeks of this feeding regime, samples from the populations demonstrated a high incidence of pregnancy in females and testicular hypertrophy in males. Control populations receiving rolled oats c...

Effect of limited mating on the corpora lutea in montane voles, Microtus montanus.

Discrimination Between Microtus Longicaudus and Microtus Montanus Using Cranial Morphology, External Measurements, DNA Sequencing, and Discriminate Function Analysis

Montane and Long-tailed voles (Microtus montanus and Microtus longicaudus) are notoriously difficult to distinguish through external characteristics and measurements in the field, particularly among juveniles. Being able to accurate identify these species is important, due to their central role in ecosystems (as keystone species) and as indicator species of climate change (due to their high sen...

Electron-microscopic localization of Trypanosoma brucei gambiense transmitted by Glossina morsitans centralis in Microtus montanus.

In Microtus montanus infected with T. b. gambiense, electron microscopic examination of lymph nodes, spleen, liver, heart, choroid plexus and brain demonstrated extravascular populations of trypanosomes distributed throughout interstitial spaces, accompanied by a moderate cellular infiltration of plasma cells. The trypanosomes exhibited numerous profiles; some were dividing, others were in diff...

Ontogeny of Deer Mice (Peromyscus maniculatus) and Montane Voles (Microtus montanus) as Owl Prey

—Frequencies of size classes of deer-mice (Peromyscus maniculatus) femora and humeri from a sample of what are believed to be barn-owl (Tyto alba) pellets collected from Columbia County, southeastern Washington, indicate that most prey were of intermediate age. Behaviors of individuals in this age class indicate that they are more susceptible to predation than older (adult) and younger individu...