Small mammal communities in North American grasslands usually contain 10 to 15 species, including carnivores, insectivores, lagomorphs and rodents. The most diverse group, the rodents, has species that primarily eat insects,... more
Small mammal communities in North American grasslands usually contain 10 to 15 species, including carnivores, insectivores, lagomorphs and rodents. The most diverse group, the rodents, has species that primarily eat insects, monocotyledons, dicotyledons or seeds, as well as species that are omnivorous. Western grasslands have summer drought and many species found there, particularly heteromyid rodents, are also found in western deserts. The wetter eastern grasslands contain insectivores and rodents that also occur in eastern forest meadows The occurrence and relative abundance of particular species at any site depends upon at least three factors: vegetational characteristics (cover and food availability), abundance of predators and abundance of competing species. A literature review indicates that competitive effects have been particularly well documented among grassland rodents. These effects range from subtle habitat shifts to competitive exclusion and appear to be directly relate...
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... Palmer Research Center, University of Alaska, Palmer, Alaska 99645. ... The only other significant trends were increased abundance of Chrysanthemum bipin-natum, decreased abundance of Dryas inte-grifolia, and decreased abundance of... more
... Palmer Research Center, University of Alaska, Palmer, Alaska 99645. ... The only other significant trends were increased abundance of Chrysanthemum bipin-natum, decreased abundance of Dryas inte-grifolia, and decreased abundance of legumes near burrows on the active ...
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... HUNTLY, NJ, AT SMITH, AND BL IVINS. 1986. Foraging behavior of a refuging herbivore, thepika (Ochotona princeps: Lagomorpha), with comparisons of grazing and caching. J. Mamm., 67:139-148. ... McKEY, DB, J. S. GARTLAN, P. G. WATERMAN,... more
... HUNTLY, NJ, AT SMITH, AND BL IVINS. 1986. Foraging behavior of a refuging herbivore, thepika (Ochotona princeps: Lagomorpha), with comparisons of grazing and caching. J. Mamm., 67:139-148. ... McKEY, DB, J. S. GARTLAN, P. G. WATERMAN, AND GM CHOO. 1981. ...
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... during the winter of 1972-1973. The summer traplines were part of a longer study of lemming populations conducted from 1955 to 1973 (Batzli et al., 1983; Pitelka, 1973). Several people collected the winter samples, which ...
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Etude comparative des resultats obtenus par deux techniques differentes pour etudier l'espace occupe par des individus. Les deux techniques sont la capture et la radio-telemetrie. Cette etude se fait sur Microtus ochrogaster
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Page 1. INFLUENCE OF SUPPLEMENTAL FOOD ON LOCAL POPULATIONS OF PEROMYSCUS LEUCOPUS LONNIE P. HANSEN AND GEORGE 0. BATZLI ABSTRACT.-The influence of supplemental food on the movement ...
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... Arctic Alp. ... Observations on huemul groups were made with the aid of binoculars (7 X 35) or a spotting scope (16-36 X) at the Nevados de Chillian (36?50'S, 71?25'W) of Nuble Province and in Aysen Province, primarily along... more
... Arctic Alp. ... Observations on huemul groups were made with the aid of binoculars (7 X 35) or a spotting scope (16-36 X) at the Nevados de Chillian (36?50'S, 71?25'W) of Nuble Province and in Aysen Province, primarily along the Rio Claro (45?36'S, 72?14'W). All huemul sites ...
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ABSTRACT Intensive live-trapping over four summers revealed that neither population density nor season (early or late growing season) affected the home-range size of singing voles. Home-range size increased with body size for both sexes,... more
ABSTRACT Intensive live-trapping over four summers revealed that neither population density nor season (early or late growing season) affected the home-range size of singing voles. Home-range size increased with body size for both sexes, and males generally had larger home ranges than females (average areas of 1,250 and 450 m2 for adult males and females, respectively). Seasonal patterns of overlap for reproductive animals suggested that singing voles have a promiscuous mating system and that territorial behavior is flexible (males tended to be territorial early in the breeding season and females tended to be territorial late in the breeding season). The construction of haypiles in August provided winter forage with higher protein content and occurred primarily in the home ranges of immature animals, the only cohort found to survive over winter.
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Page 1. JOURNAL OF MAMMALOGY L0N0, 0. 1970. The polar bear (Ursus maritimus Phipps) in the Svalbard area. Norsk Polarinstitutt Skrifter 149:1-103. 1972. Do polar bears caught in Svalbard originate in Russian territory? Fauna, 25:69-76.... more
Page 1. JOURNAL OF MAMMALOGY L0N0, 0. 1970. The polar bear (Ursus maritimus Phipps) in the Svalbard area. Norsk Polarinstitutt Skrifter 149:1-103. 1972. Do polar bears caught in Svalbard originate in Russian territory? Fauna, 25:69-76. (In Norwegian). ...
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... northern Alaska Roy M. Peterson, Jr. ... 2.2. Radiotelemetry We captured lemmings by hand or live traps during July 1973, fitted them with radio transmitters in collars that weighed 2.5-3.0 g (4.1-5.5% of body weight) and released... more
... northern Alaska Roy M. Peterson, Jr. ... 2.2. Radiotelemetry We captured lemmings by hand or live traps during July 1973, fitted them with radio transmitters in collars that weighed 2.5-3.0 g (4.1-5.5% of body weight) and released them at their points of capture. ...
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... Press, Stanford, California, 506 pp. Mamm., 50:121. MASER, C., BR MATE, JF FRANKLIN, AND CT VERNER, J., AND AS Boss. 1980. California wild-DYRNESS. 1981. ... J. Mamm., 60:740-750. BRINKMAN, G. L., J. S. SHENK, R. G. CREECH, AND D. L.... more
... Press, Stanford, California, 506 pp. Mamm., 50:121. MASER, C., BR MATE, JF FRANKLIN, AND CT VERNER, J., AND AS Boss. 1980. California wild-DYRNESS. 1981. ... J. Mamm., 60:740-750. BRINKMAN, G. L., J. S. SHENK, R. G. CREECH, AND D. L. GARWOOD. 1974. ...
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... CHERRY, RH, AND L. VERNER. 1975. Sea-sonal acclimation to temperature in the prai-rie vole, Microtus ochrogaster. Amer. Mid-land Nat., 94:354-360. COADY, JW 1975. Bioenergetics of the brown lemming. Unpubl. Ph.D. dissert., Univ.... more
... CHERRY, RH, AND L. VERNER. 1975. Sea-sonal acclimation to temperature in the prai-rie vole, Microtus ochrogaster. Amer. Mid-land Nat., 94:354-360. COADY, JW 1975. Bioenergetics of the brown lemming. Unpubl. Ph.D. dissert., Univ. Alaska, Fairbanks, 117 pp. COLE, ...
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... Apparently, Labrador tea had chemical deterrents that reduce consumption by the microtine rodents in the field (Batzli and ... As has been shown for insects, mammalian herbivores have nutritional adaptations that differ among closely... more
... Apparently, Labrador tea had chemical deterrents that reduce consumption by the microtine rodents in the field (Batzli and ... As has been shown for insects, mammalian herbivores have nutritional adaptations that differ among closely related ... The herbivore-based trophic system. ...
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ABSTRACT Analyses of stomach contents and feces showed striking differences in the diets of the brown lemming (Lemmus sibiricus) and the collared lemming (Dicrostonyx groenlandicus) near Barrow, Alaska. Brown lemmings ate primarily... more
ABSTRACT Analyses of stomach contents and feces showed striking differences in the diets of the brown lemming (Lemmus sibiricus) and the collared lemming (Dicrostonyx groenlandicus) near Barrow, Alaska. Brown lemmings ate primarily grasses, sedges, and mosses, whereas collared lemmings ate primarily willow leaves and forbs. Brown lemming diets changed markedly with season and with habitat. Monocotyledons were always the most important food items; in winter and in drier habitats mosses became a more important component of the diet (up to 40%). Among the monocotyledons, brown lemmings consistently preferred tundra grass (Dupontia fisheri), consistently avoided a sedge (Carex aquatilis), and took a relatively constant amount of cottongrass sedge (Eriophorum spp.) no matter what its availability. Differing food habits of lemmings in different habitats may have important consequences for their growth, reproductive performance, and population dynamics.
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... Thus, our results for shorter distances between patches were consistent with previous work that found decreased movement of prairie voles as density increased (Abramsky and Tracy 1980, Gaines and Johnson 1982, Desy et al. ...
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... First, we observed feral cats (Felis silvestris) and fox snakes (Elaphe vulpina) in enclosures with predator access (+P), but never in ... Uro-cyon cinereoargenteus), long-tailed weasels (Mustela frenata), red-tailed hawks (Buteo... more
... First, we observed feral cats (Felis silvestris) and fox snakes (Elaphe vulpina) in enclosures with predator access (+P), but never in ... Uro-cyon cinereoargenteus), long-tailed weasels (Mustela frenata), red-tailed hawks (Buteo jamaicensis) and great-horned owls (Buto virginianus ...
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... It is not surprising, therefore, that many ecologists report a positive correlation between reproductive performance and trends in density of microtines (Krebs and Myers ... Then members of each group were mated with strangers;... more
... It is not surprising, therefore, that many ecologists report a positive correlation between reproductive performance and trends in density of microtines (Krebs and Myers ... Then members of each group were mated with strangers; females already with strange males were ...
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ABSTRACT To determine the role lemmings play in structuring plant communities and their contribution to the 'greening of the Arctic', we measured plant cover and biomass in 50 + year old lemming exclosures and... more
ABSTRACT To determine the role lemmings play in structuring plant communities and their contribution to the 'greening of the Arctic', we measured plant cover and biomass in 50 + year old lemming exclosures and control plots in the coastal tundra near Barrow, Alaska. The response of plant functional types to herbivore exclusion varied among land cover types. In general, the abundance of lichens and bryophytes increased with the exclusion of lemmings, whereas graminoids decreased, although the magnitude of these responses varied among land cover types. These results suggest that sustained lemming activity promotes a higher biomass of vascular plant functional types than would be expected without their presence and highlights the importance of considering herbivory when interpreting patterns of greening in the Arctic. In light of the rapid environmental change ongoing in the Arctic and the potential regional to global implications of this change, further exploration regarding the long-term influence of arvicoline rodents on ecosystem function (e.g. carbon and energy balance) should be considered a research priority.