The Arctic Prairies

Seton, Ernest Thompson; Miles, Enos A.; Chase, J. Smeaton; Packard, Winthrop; Spence, Lewis; Lindsay, Forbes; Anderson, Christopher

doi:10.2307/1778492

Cited by 7 publications

(13 citation statements)

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“…This was followed by a marked decline and second nadir in growth during the 1960s and 70s. A rapid Seton 1912). This stand is shown on the 1833 map by Back (Figure 7).…”

Section: Temperature and Radial Growth Of White And Black Sprucementioning

confidence: 93%

“…The location is approximately 63°12'N and 107°56'W, and spruce can be found in the region today. The final stands of spruce in this vicinity were noted by Back (1970), Tyrrell (1902), Hanbury (1904), and Seton (1912). His 1907 photograph ( Figure 10) is of particular historical importance as it shows the first dendrochronological sampling at the arctic treeline in North America.…”

Section: Analysis Of Historical Recordsmentioning

confidence: 95%

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Response of the Central Canadian Treeline to Recent Climatic Changes

MacDonald

Szeicz

Claricoates

et al. 1998

Annals of the Association of American Geographers

241

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Dendrochronology and the analysis of historical records from eighteenth, nineteenth, and early twentieth-century expeditions are used to reconstruct the response of the central Canadian treeline to recent climatic variations. Cold summer temperatures during the early to mid-nineteenth century contributed to low rates of growth and poor recruitment of white and black spruce at treeline. Despite the harsh conditions, however, individuals of both species were able to persist at sites that define their northern range limits today. After 1880, increases in regional and hemispheric temperature are associated with increased growth rates and recruitment by both white and black spruce. A drop in temperatures during the 1960s and 1970s corresponds with declines in growth rates and recruitment. Growth rates have responded positively to higher temperatures in the 1980s, yet despite this positive response to recent temperature increases, dendrochronological and historical evidence suggest that there has been no significant northward extension of spruce range limits or continuous forest. It is likely that future climate warming, caused by the anthropogenic increases in greenhouse gases, will initially produce increased growth and higher rates of recruitment in treeline stands. The extension of the boreal forest northward, however, could experience a significant lag relative to climate warming.

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“…This was followed by a marked decline and second nadir in growth during the 1960s and 70s. A rapid Seton 1912). This stand is shown on the 1833 map by Back (Figure 7).…”

Section: Temperature and Radial Growth Of White And Black Sprucementioning

confidence: 93%

Section: Analysis Of Historical Recordsmentioning

confidence: 95%

Response of the Central Canadian Treeline to Recent Climatic Changes

MacDonald

Szeicz

Claricoates

et al. 1998

Annals of the Association of American Geographers

241

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“…The consequence of a rapid increase in snowshoe hare numbers in boreal forests is severe winter browsing of preferred browse species (Seaton 1911, Aldous and Aldous 1944, Grange 1949, 1965, Dodds 1960, DeVos 1964, Fox 1978, Pease etal. 1979, such as S. alaxensis growing on floodplains in interior Alaska (Fig.…”

Section: Nutritional Quality Of Twigsmentioning

confidence: 99%

Interactions of Snowshoe Hare and Feltleaf Willow in Alaska

Bryant¹,

Wieland²,

Clausen³

et al. 1985

Ecology

102

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Evidence from experimental feeding trials and chemical analysis showed that, when severe winter browsing of adult—form Alaska feltleaf willow (Salix alaxensis) causes it to revert to juvenile—form stump sprouts, the twigs are unpalatable and of lower nutritional quality to the hares than are twigs of adult—form S. alaxensis plants. Further feeding choice trials demonstrated that the palatability of winter—dormant S. alaxensis to snowshoe hares is a function of the age of the sprout and its chemistry rather than the accessibility (height) or morphology of the twigs. The low nutritional quality of juvenile sprouts is partially caused by decreased dry matter and nitrogen digestibility, which may be related to increased lignin and phenolic content of the twigs. This browsing—induced resistance to future winter browsing by hares relaxes within 3 yr and within the height range of twigs normally available to snowshoe hares in winter. These results are compatible with hypothesis that the inducation and relaxation of resistance to browsing in the preferred winter food of snowshoe hares is a cause of the well—known 10—yr snowshoe hare cycle.

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“…Dutcher, in 1902, found the whole mountain top showing abundant old microtine sign, but was able in extended trapping to take only two specimens, which were taken from the krummholz. (Elton, 1924;Howell, 1923;Seton, 1920 (1913), must be equally well supplied by the krummholz. There is no reason to consider enemies more abundant; indeed there is some evidence, based on various carnivores which do not reach the upper stations, that they are less so.…”

Section: The Environmentmentioning

confidence: 99%

A comparison of the animal communities of coniferous and deciduous forests,

Blake¹

1927

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The Arctic Prairies

Cited by 7 publications

References 0 publications

Response of the Central Canadian Treeline to Recent Climatic Changes

Response of the Central Canadian Treeline to Recent Climatic Changes

Interactions of Snowshoe Hare and Feltleaf Willow in Alaska

A comparison of the animal communities of coniferous and deciduous forests,

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