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Friday, November 20, 2020 | History

2 edition of Phenetic variation in the snowshoe hare, Lepus americanus:. found in the catalog.

Phenetic variation in the snowshoe hare, Lepus americanus:.

David W. Nagorsen

Phenetic variation in the snowshoe hare, Lepus americanus:.

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Published .
Written in English


The Physical Object
Pagination177 leaves
Number of Pages177
ID Numbers
Open LibraryOL14751841M

The Canada lynx relies largely on snowshoe hares (Lepus americanus) which make up % of its diet. Canada lynx take an average of about 1 hare every three days to 3 hares every two days, the kill rate varying with prey abundance.


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Phenetic variation in the snowshoe hare, Lepus americanus:. by David W. Nagorsen Download PDF EPUB FB2

Full Text; PDF ( K) PDF-Plus ( K) Latitudinal variation in snowshoe hare (Lepus americanus) body mass: a test of Bergmann’s ruleLaura C. Gigliotti, a Nathan D. Berg, b Rudy Boonstra, c Shawn M. Cleveland, d Duane R. Diefenbach, e Eric M. Gese, f Jacob S. Ivan, g Knut Kielland, h Charles J.

Krebs, i Alexander V. Kumar, j L. Scott Mills, j k Jonathan N. Pauli, l H. Brian Underwood, m Cited by: 1. A Morphometric Study of Geographic Variation in the Snowshoe Hare (Lepus americanus) (Canadian Journal of Zoology, Vol no.

3) [D. Nagorsen] on *FREE* shipping on qualifying offers. Pgs. - Author: D. Nagorsen. Latitudinal variation in snowshoe hare (Lepus americanus) body mass: a test of Bergmann’s rule Laura C. Gigliotti, Nathan D. Berg, Rudy Boonstra, Shawn M. Cleveland, Duane R. Diefenbach. We investigated whether snowshoe hares (Lepus americanus Erxleben, ) follow Bergmann’s rule by investigating differences in body mass using data from six published studies and from data of individual hares captured from 10 populations across North America covering 26° of north latitude.

We also explored alternative hypotheses related Cited by: 1. Full Text; PDF ( K) PDF-Plus ( K) Citing articles; Geographic variation in winter adaptations of snowshoe hares (Lepus americanus)L.C.

Gigliotti,* a D.R. Diefenbach, b M.J. Sheriff c a Pennsylvania Cooperative Fish and Wildlife Research Unit, The Pennsylvania State University, University Park, PAUSA. b U.S. Geological Survey, Pennsylvania Cooperative Fish and Wildlife Research Cited by: 9.

We found significant geographic variation in bobcat body size, with about 44% of the variation in males and 47% of the variation in females accounted for by comparison among the localities. We also found that variation in body size was associated with Bergmann's rule, as indicated by significant multiple regression of body size of males (R 2.

We compared winter pelage characteristics and heat production of snowshoe hares (Lepus americanus Erxleben, ) on the southern edge of their range, in Pennsylvania (USA), to a northern population, in the Yukon (Canada), to investigate how hares might respond to changing environmental conditions.

We also investigated how hares in Pennsylvania. In a highdensity snowshoe hare (Lepus americanus) population in the Kluane boreal forest region, Krebs et al. ( Krebs et al. (, used m 2 ( × cm) rectangular pellet plots. The cyclic changes in abundance of the snowshoe hare (Lepus Lepus americanus:. book Erxleben, ) and the Canadian lynx (Lynx canadensis Kerr, ) are well known (1–4).These 9- to year fluctuations are commonly discussed in ecology texts (e.g., refs.

5 and 6) as examples of coupled predator–prey cycles (7–13). Even though the biodiversity of the boreal forest is low (), it is still a too. We calibrated snowshoe hare (Lepus americanus) numbers with pellet counts in Minnesota, USA, to understand the relationship between hare numbers and pellets in the central portion of the hare range.

The snowshoe hare (Lepus americanus), a key prey species of the boreal forest of North America (Krebs, Boonstra, Boutin, & Sinclair, ), exhibits seasonal colour moults in the majority of its. Snowshoe Hare. Lepus americanus. Status: Not Listed. Classification: Mammal.

Description. Snowshoe hares have an interesting adaptation that helps protect them against predators. Depending on the season, their fur can be a different color. During the winter, snowshoe hares are white, which helps them blend in with the snow.

When the seasons. 1. Introduction. The cyclic dynamics of snowshoe hare (Lepus americanus) populations throughout much of North America's boreal forest is probably one of the better documented among mammals species, although many populations of snowshoe hare fluctuate irregularly or are stationary (see Keith, and Schaffer, for references).The snowshoe hare is usually considered to be a.

The rise and fall in numbers of snowshoe hares and Canada lynx was observed more than two hundred years ago by trappers working for Hudson’s Bay Company, which was once heavily involved in the fur the early 20th century, records of the number of lynx and hare pelts traded by Hudson’s Bay were analyzed by biologist Charles Gordon Hewitt.

To assess the effects of clearcutting on snowshoe hare (Lepus americanus) relative abundance, we surveyed pellets in 1 m 2 circular plots and, vegetation and browse surveys in m 2 circular plots among four different aged clearcut (30, 20, 10, 5 years post-harvest) and mature forests (> years old) in central Labrador, were modelled at three grain sizes: transect (.

Snowshoe hares, Lepus americanus, are the dominant prey species in the boreal forest and they undergo regular, predator-driven population cycles every 8–11 us research has found that hare stress physiology is highly sensitive to both within-year (seasonal/litter group) and across-year (cycle phase) variation in predation risk and that maternal–offspring stress profiles are.

We determined the optimum transect length and spacing for detecting snowshoe hare (Lepus americanus) from snow-track surveys in a fixed area. We also. A white ball of fur is easy to spot against a stark brown backdrop. That’s what makes it so easy for predators to spot snowshoe hares (Lepus americanus) when snow comes late or leaves earlier than expected.“They’re so obvious, like lightbulbs jumping around on dark snowless forest floor,” said Marketa Zimova, a Ph.D.

student at North Carolina State University and lead author of a study. a series of studies on the snowshoe hare cycle in Alberta, beginning his career with an early book on cycles (Keith, ).

Lloyd Keith was convinced that the hare cycle was driven by two factors, food shortage in winter, which depressed reproduction, and predation in the decline phase.

Two population oscillations dominate terrestrial community dynamics in northern Canada. In the boreal forest, the snowshoe hare (Lepus americanus) fluctuates in cycles with an 8–10 year periodicity and in tundra regions lemmings typically fluctuate in cycles with a 3–4 year periodicity.I review 60 years of research that has uncovered many of the causes of these population cycles, outline.

Snowshoe hares (Lepus americanus) are an ecologically important herbivore because they modify vegetation through browsing and serve as a prey resource for multiple implemented a multiscale approach to characterize habitat relationships for snowshoe hares across the mixed conifer landscape of the northern Rocky Mountains, objectives were to (1) assess the relationship.

Snowshoe hares sampled in three distinct watersheds within the Humber River catchment provided data to examine geographic variation in prevalence of viral antibodies on a more restricted geographic scale. The SSHV seropositivity values for snowshoe hares live-trapped in these watersheds differed significantly (G =P.

Koehler, G.M. Population and habitat characteristics of lynx and snowshoe hares in north central Washington. Canadian Journal of Zoology Koehler, G.M.

Snowshoe hare, Lepus americanus, use of forest successional stages and population changes during in north-central Washington. Canadian Field-Naturalist.

Get this from a library. Survival and activity patterns of snowshoe hares (Lepus americanus) in interior Alaska. [Dashiell S Feierabend] -- Snowshoe hare (Lepus americanus) survival depends on the interaction of habitat characteristics with numerous biological and environmental variables.

In boreal regions where considerable habitat. Canada lynx (Lynx canadensis) specialize on snowshoe hares (Lepus americanus) and exhibit cyclic fluctuations in abundance that lag 1–2 years behind those of snowshoe hares.

Declining hare densities spur demographic changes in lynx, but it is unclear whether a corresponding increase in diet breadth occurs: (1) broadly across a lynx population. sampling program. We chose the snowshoe hare (Lepus americanus) as 1 species for study. It is numerically the most important small game an-imal in the province (Van Nostrand ) and also deposits fecal pellets that can be counted rapidly to provide reliable information on habi-tat use and population levels (AdamsBook-hout Latitudinal variation in snowshoe hare (Lepus americanus) body mass: A test of Bergmann’s Rule.

Canadian Journal of Zoology 98(1): doi: /cjz   When life is good, populations of showshoe hares (Lepus americanus) can roughly double every year. But the hare's predators—lynx, foxes, coyotes—also increase in numbers as their food multiplies.

Then the hare population crashes: nearly every animal becomes a meal. Predators also lose numbers as their food disappears. Snowshoe hares (Lepus americanus Erxleben) are a common and important prey animal in boreal forests and are the primary prey for the US federally threatened Canada lynx (Lynx canadensis Kerr), so understanding hare dynamics in post-fire landscapes is critical for managing lynx.

We collected habitat and fecal pellet data from sites across. The long ears and hind legs distinguish the Black-tailed Jack Rabbit from the three species of Montana cottontails (Sylvilagus floridanus, S. audubonii, and S.

nuttallii), as well as the Pygmy Rabbit (Brachylagus idahoensis) (Foresman b).Both the White-tailed Jack Rabbit (Lepus townsendii) and the Snowshoe Hare (Lepus americanus) lack the black coloration on the tail.

The snowshoe hare (Lepus americanus) is a foundational prey species in the boreal forests of North America (Krebs et al. ) that faces drastically different weather conditions, food availability, and predation pressure throughout the response to changing environmental challenges, hares shift their seasonal ranges to habitats with denser cover when more predators are.

Pronunciation of snowshoe hare with 2 audio pronunciations, 3 synonyms, 9 translations and more for snowshoe hare. International Phonetic Alphabet (IPA) and Phonetic spelling. Hyphenate: s-now-shoe hare snowshoe hare. snowshoe rabbit,varying hare,Lepus americanus. Wild Sylvilagus as well as hares (Lepus californicus and Lepus americanus) have antibodies to WEE (Bowers et al., ; Yuill et al., ).

Infection studies of Oryctolagus cuniculus with strains of WEE isolated from South America and North America demonstrated virus strain variation in clinical signs and mortality (Bianchi et al., ).

heightened resource competition with lynx, mainly for the lynx’s main prey, snowshoe hares (Lepus americanus). We studied the seasonal variation of coyote diets and the dietary overlap between coyotes and lynx in a km 2 high-elevation study area in northwestern Wyoming. The snowshoe hare (Lepus americanus) is a keystone prey species of the boreal forest (Krebs, ) and experiences regular population cycles that occur over year periods (Krebs et al., ).

Individual behaviour and population dynamics of hares are shaped heavily by predation, which can account for 85%% of mortalities in certain. Synchrony in the snowshoe hare (Lepus americanus) cycle in northwestern North America. Canadian Journal of Zoology. MAFFEI, L., E. CULLAR AND A.

NOSS. The snowshoe hare (Lepus americanus) is the most widespread North American hare, occurring throughout most of Canada and northern United States and southward along the Rocky Mountains. In the northern Canadian tundra, snowshoe hares are replaced by the larger Arctic hare (L.

arcticus) preferring more opened habitats. Here, we explicitly examine whether fire size affects relative abundances of a keystone herbivore, snowshoe hare (Lepus americanus Erxleben, ), in regenerating stands of the same age.

We surveyed vegetation and fecal pellets of snowshoe hares in nine year-old wildfires, specifically, three fires in three size categories—small (80 to.

The snowshoe hare (Lepus americanus) has the largest geographic range of any North American leporid (Hall ; Nelson ).Its distribution is broadly associated with boreal and subalpine forests, which span more than 65° of latitude from the northern Canadian Arctic southward through the Appalachian, Rocky, and Sierra Nevada mountains ().The extreme southern extent of its distribution is.

The Canada lynx (Lynx canadensis) is a medium-sized North American cat that ranges across Alaska, Canada and many of the contiguous United is characterized by its long, dense fur, triangular ears with black tufts at the tips, and broad, snowshoe-like r to the bobcat (L.

rufus), the hindlimbs are longer than the forelimbs, so that the back slopes downward to the front. Population ecology - Population ecology - Logistic population growth: The geometric or exponential growth of all populations is eventually curtailed by food availability, competition for other resources, predation, disease, or some other ecological factor.

If growth is limited by resources such as food, the exponential growth of the population begins to slow as competition for those resources.SNOWSHOE HARE (Lepus americanus) HABITAT USE INFORMATION General The snowshoe hare (Lepus americanus) is indigenous to boreal forests throughout North America (Dolbeer and Clark ).

Snowshoe hares consume herbaceous vegetation during the growing season and change to a woody diet in the fall and winter (Baker et al.

; Dodds ). Young.Occurrence of rodents peaked in the summer (%) while lagomorphs, mainly snowshoe hare, peaked in the fall (%) and spring (%). Percent occurrence of snowshoe hare was highest during the fall (% of all fall occurrences) and least during the winter (% of all winter prey occurrence).