New distribution records of Echinococcus multilocularis in the brown lemming from Barrow, Alaska, USA.

The Pomarine Jaeger as a Brown Lemming Predator in Northern Alaska

T HE population fluctuations of many arctic predators, both avian and mammalian, are associated with changes in the numbers of their major prey, the several species of arctic lemmings. Pitelka, Tomich, and Treichel (1955~) reported that the breeding densities of avian predators near Barrow, Alaska from 1951 to 1953 were correlated with lemming abundance. Th eir work confirmed that the Pomarine ...

Limited range of genetic variation in Echinococcus multilocularis.

DNA sequencing of 1.3 kb of rDNA containing both internal transcribed spacers (ITS1, ITS2) and adjoining rRNA coding regions in each of 11 Echinococcus multilocularis isolates from Germany, Japan, and Alaska resulted in identical nucleotide sequences except for a single polymorphic locus 54 bp upstream of the 3' end of the 18S coding region, separating Eurasian isolates from an Alaskan isolate....

Alternative models for cyclic lemming dynamics.

Many natural population growths and interactions are affected by seasonal changes, suggesting that these natural population dynamics should be modeled by nonautonomous differential equations instead of autonomous differential equations. Through a series of carefully derived models of the well documented high-amplitude, large-period fluctuations of lemming populations, we argue that when appropr...

Studies on the helminth fauna of Alaska. XXXI. Observations on the propagation of the larval Echinococcus multilocularis Leuckart, 1863, in vitro.

Distribution and prevalence of Echinococcus multilocularis in wild predators in Nebraska, Kansas, and Wyoming.

To further determine the distribution and prevalence of Echinococcus multilocularis in the central United States, 245 wild canids (125 red foxes, 120 coyotes) and 33 bobcats were collected from Nebraska, Kansas, and Wyoming and examined for this parasite. Animals examined included 11 red foxes from the western panhandle of Nebraska; 5 red foxes and 30 coyotes from southern Nebraska; 56 red foxe...