mercury, lead and lead isotope ratios in the teeth of moose (alces alces) from isle royale, u.s. upper midwest, from 1952 to 2002.assessing the effect of recent reductions in atmospheric pollution on metal concentrations in wildlife in north america has been difficult because of the sparse availability of historical samples with which to establish a "pre-regulation" baseline, and because many ecosystems may be affected by local point sources which could obscure broader-scale trends. here we report a recent 50 yr annual record of hg, pb and pb isotope ratios in the teeth of a resident population of moose (alces alces) in is ...200920449224
osteoporotic skull lesions in moose at isle royale national park.osteoporotic lesions were evaluated in the skulls of moose (alces alces) collected in isle royale national park, michigan (usa), from 1958 to 1994. circular lesions which penetrated the outer table of the skull were distributed over the frontal and nasal bones asymmetrically in both sexes. about 32% of skulls recovered had some porotic lesions with slightly greater prevalence among males.19968627919
increased osteoarthritis in moose from isle royale.over the past 30 yr, moose (alces alces) in isle royale national park (michigan, usa) exhibited a several-fold increase in the prevalence of osteoarthritis, or degenerative joint disease (djd). available evidence points to an environmental explanation for this change. greater physical activity among afflicted moose is not a likely contributing factor, nor is genetic change in the population. the possible introduction of an unspecified disease agent cannot be dismissed at this time. moose exhibit ...19883411702
the roles of predator maturation delay and functional response in determining the periodicity of predator-prey cycles.population cycles in small mammals have attracted the attention of several generations of theoretical and experimental biologists and continue to generate controversy. top-down and bottom-up trophic regulations are two recent competing hypotheses. the principal purpose of this paper is to explore the relative contributions of a variety of ecological factors to predator-prey population cycles. here we suggest that for some species - collared lemmings, snowshoe hares and moose in particular - matu ...200919563815
differences in urinary chemistry profiles of moose on isle royale during winter.during winters 1987-1988 (i) and 1988-1989 (ii), we assessed the physiological status of moose (alces alces) residing on the west and east ends of isle royale (michigan, usa) by collecting and chemically analyzing urine deposited in snow (snow-urine) from january to early march. samples were assayed for urea nitrogen (u), sodium (na), potassium (k), calcium (ca), phosphorus (p) and creatinine (c). throughout both winters, elevated urinary u:c ratios in snow-urine samples collected from east-end ...19911920659
prevalence of neutralizing antibody to jamestown canyon virus (california group) in populations of elk and moose in northern michigan and ontario, canada.blood samples were collected from free-ranging elk (cervus elaphus) harvested in michigan's northern lower peninsula, from moose (alces alces) relocated from ontario's algonquin provincial park to michigan's upper peninsula, and from moose from michigan's isle royale national park. sera were tested by serum dilution neutralization tests in vero cell culture for neutralizing antibody to california serogroup viruses, in particular jamestown canyon (jc), la crosse/snowshoe hare (lac/ssh), and trivi ...19863503129
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