Microtine cycle

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Web26 feb. 1971 · The number of Microtuseaten per month per carnivore varied from 109 to 40. Predation pressure, measured by the ratio number of voles per number of carnivores was most intense at the end of the crash. As the vole population declined, the carnivores ate relatively more gophers, harvest mice, rabbits, birds, and reptiles. WebIms, R. A. and Steen, H. 1990. Geographical synchrony in microtine population cycles: a theoretical evaluation of the role of nomadic avian predators. - Oikos 57: 381-387. A simple mathematical model is developed and analyzed to evaluate the hypothesis that regional synchrony in microtine population cycles is caused by nomadic avian predators.

Model of microtine cycles caused by lethal toxins in non …

WebLarge- and small-mammal distribution patterns and chronostratigraphic boundaries from the Late Pliocene to the Middle Pleistocene of the Italian peninsula Webhave synchronized microtine populations than regions with many such predators and that highly synchronized microtine populations have cycles with smaller amplitudes and … does nathan scott go to the nba

Negus: Population Dynamics of Microtine Rodents

Webmicrotine populations in boreal regions of Fennoscandia have been claimed as evidence that predation deepens and extends the low phase of the microtine population cycles. … WebWe tested the following four predictions of the hypothesis that small mustelids cause the low phase of the microtine cycle. (1) The densities of predators should lag well behind the … Web暨南大学,数字图书馆. 开馆时间：周一至周日7:00-22:30 周五 7:00-12:00; 我的图书馆 does nathan scott have a love child

Microtine Cycles: The Role of Habitat Heterogeneity - JSTOR

Population Cycles in Small Mammals - University of British Columbia

WebEXPERIMENTAL STUDIES OF COMPETITIO AMONN G FOUR SPECIE OS F VOLES by David Bruc Hawee s A., Universit oyf California, Berkeley, 19 A thesi submittes idn partial fulfilmen of t Web1 feb. 1988 · the microtine density cycle, and then decrease during . the next 2-3 yr. My model then predicts that the profitability of a . distraction display strategy for grouse hens will vary . during a ... facebook lasdWebTaxonomic decisions made by palaeontologists are often based on a few morphological features preserved in the fossil material. This practice may sometimes lead to the description of new species based on single specimens, which are, in fact, extreme or aberrant morphological variants of known taxa. Ancient DNA (aDNA) analysis of the Late … does nathan scott play in the nba

"WebMicrotine (short-tailed field mice or voles) species exhibit a regular periodicity in their cyclic behavior. A study of this subject is justified because of the damage to agriculture … " - Microtine cycle

Microtine cycle

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WebMay 15, 1937 Biology of Microtine Cycles 783 A wire circle 20 inches in diameter was dropped at 20-foot intervals, 100 counts being made for each investigated area. Monthly records thus secured substantiated the trapping records and indicate a sharp decrease in mouse numbers in many areas from the winter of 1935-36 to the summer of 1936 (table 1). WebTheory predicts that trophic interactions can produce cyclic dynamics of microtine rodents, but that in addition, social interactions are necessary to create the cyclicity. We tested the induced defence hypothesis as a component driving multi-annual cycles by analyzing data on Siberian lemming (Lemm...

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Web25 dec. 2001 · Summary 1. We assessed the impact of predation by hen harriers and peregrine falcons on a red grouse population in southern Scotland during 1992–98. Grouse density in April, July and October declined during this time, coincident with an increase in the numbers of breeding harriers and peregrines. 2. Weband population cycles. These popula-tion cycles vary from 5 years in some parts of North America to 10 years in others. Population levels can be impacted by food availability and accessibility. Both male and female muskrats become more aggressive during the breeding season to defend their territo-ries. Copulation usually takes place while ...

Webthe microtine population cycles, although predation has the strongest regulating effect when microtine densities are low relative to predator densities (Hestbeck 1987). As … Web1 jan. 2005 · Activities and Societies: Phi Beta Kappa, Cycling Team, ... to pair and recombine in male meiosis has been independently lost at least three times during the evolution of Microtine rodents.

WebThe objective of this thesis was to investigate the effects of mammalian grazers, such as microtine rodents and reindeer, (top-down effects) and nutrient availability (bottom- up effects) on the plant community of a tundra heath. I conducted a large-scale fertilization experiment and studied the imp... Full description WebBabesiosis is a zoonosis caused by tick-transmitted intraerythrocytic protozoa of the Phylum Apicomplexa.The disease mostly occurs in the USA, but cases have also been reported in several European countries, in Egypt, India, Japan, Korea, Taiwan, and South Africa.

Webis, we know that the so-called 'microtine cycle' is real (e.g. Stenseth and Ims 1993b). The causes underlying these periodic fluctuations continue to be debated, though (cf.

WebCauses and geographic patterns of microtine cycles. ISBN: 9519974148 Author: Henttonen, Heikki Corporate author: University of Helsinki. Dept. of zoology University of Helsinki. Department of zoology Publisher: Helsinki : Yliopistopaino, 1986. Description: 9 p. Thesis: Diss. doct. does national express ticket include luggageWebTranslations in context of "spécifique a été déterminée" in French-English from Reverso Context: La chaleur spécifique a été déterminée par des essais DSC à 140 ºC. does national car rental offer aarp discountWebIn herpetic stromal keratitis (HSK), herpes simplex virus type-1 DNA fragments and herpes simplex virus-immunoglobulin G immune complexes are present in corneas long after the infective virus has disappeared. does nathan scott die in one tree hillWebThis region is dominated by three microtine rodents; collared lemming (Dicrostonyx groenlandicus), North American brown lemming (Lemmus trimucronatus), and tundra vole (Microtus oeconomus), ... Methods: Participants performed a single-visit stationary cycling experiment comprised of 12 randomized trials of known vs unknown 10, 20, ... does national defense medal count for vraWebThe hypothesis that dispersal causes the cyclic fluctuations of small mammals is perhaps the oldest hypothesis in small mammal ecology, dating from the last century. If lemmings … does nat increase forwarding delaysWebDensities of microtine rodents in two habitat complexes in the tundra of Finnmarks-vidda, Norwegian Lapland, were studied during 1977-89 by means of snap trapping (Small … does nathan mackinnon have a girlfriendWebMicrotine cycles in northern Fennoscandia show a statistical periodicity, and are characterized by a high degree of interspecific synchrony among sympatric … does national express coaches have toilets