Can the solar cycle and climate synchronize the snowshoe hare cycle in Canada Evidence from tree rings and ice coresReport as inadecuate




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population biology, Northwestern Minnesota, variability, 10-year, signals, records, oscillation, plant secondary compounds, irradiance, temperature

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Subject-Keyword: population biology Northwestern Minnesota variability 10-year signals records oscillation plant secondary compounds irradiance temperature

Type of item: Journal Article Published

Language: English

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Description: Dark marks in the rings of white spruce less than 50 yr old in Yukon, Canada, are correlated with the number of stems browsed by snowshoe hares. The frequency of these marks is positively correlated with the density of hares in the same region. The frequency of marks in trees germinating between 1751 and 1983 is positively correlated with the hare fur records of the Hudson Bay Company. Both tree marks and hare numbers are correlated with sunspot numbers, and there is a 10-yr periodicity in the correlograms. Phase analysis shows that tree marks and sunspot numbers have periods of nearly constant phase difference during the years 1751-1787, 1838-1870, and 1948 to the present, and these periods coincide with those of high sunspot maxima. The nearly constant phase relations between the annual net snow accumulation on Mount Logan and 1 tree mark ratios, 2 hare fur records before about 1895, and 3 sunspot number during periods of high amplitude in the cycles suggest there is a solar cycle-climate-hare population and tree mark link. We suggest four ways of testing this hypothesis

Date created: 1993

DOI: doi:10.7939-R3SJ19T5S

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Rights: Copyright 1993 by The University of Chicago.





Author: Sinclair, A.R. Gosline, J.M. Holdsworth, G. Krebs, C.J. Boutin, S. Smith, J.N. Boonstra, R. Dale, M.

Source: https://era.library.ualberta.ca/


Teaser



Vol.
141,No.
2 The American Naturalist February1993 CAN THE SOLAR CYCLE AND CLIMATE SYNCHRONIZE THE SNOWSHOE HARE CYCLE IN CANADA? EVIDENCE FROM TREE RINGS AND ICE CORES A.
R.
E.
SINCLAIR,J.
M.
GOSLINE, G.
HOLDSWORTH,*C.
J.
KREBS, S.
BOUTIN,t J.
N.
M.
SMITH,R.
BOONSTRA,tAND M.
DALEt ofZoology,University ofBritishColumbia,Vancouver,BritishColumbiaV6T 1Z4, Department S7N 3H5,Canada, ResearchInstitute, Canada; *NationalHydrology Saskatoon,Saskatchewan ofZoology,University ofAlberta, andArcticInstitute, ofCalgary;tDepartment University AlbertaT6G 2E9, Canada; tDivisionofLifeSciences,Scarborough Edmonton, College, ofToronto,WestHill,OntarioMIC 1A4,Canada University SubmittedNovember 12, 1990; Revised July22, 1991; Accepted February6, 1992 Abstract.-Darkmarksin theringsofwhitespruceless than50 yrold in Yukon,Canada,are withthenumber ofstemsbrowsedbysnowshoehares.Thefrequency correlated ofthesemarks withthedensity is positively correlated ofharesin thesameregion.Thefrequency ofmarksin treesgerminating between1751and 1983is positively withtheharefurrecordsof correlated the HudsonBay Company.Bothtreemarksand harenumbersare correlated withsunspot in thecorrelograms. and thereis a 10-yrperiodicity Phase analysisshowsthattree numbers, marksand sunspotnumbers haveperiodsofnearlyconstantphasedifference theyears during 1751-1787,1838-1870,and 1948to thepresent,and theseperiodscoincidewiththoseofhigh betweentheannualnetsnowaccumulation sunspotmaxima.Thenearlyconstant phaserelations onMountLoganand(1) treemarkratios,(2) harefurrecordsbeforeabout1895,and(3) sunspot number inthecyclessuggest during periodsofhighamplitude thereis a solarcycle-climate-hare and treemarklink.We suggestfourwaysoftesting thishypothesis. population to global weather High northern ecosystemsare likelyto react sensitively to cyclicalenvichanges.However,northern ecosystems mayalso be responding ronmental eventsinadditionto possibleglobalwarming (Kane andTeixeira1990; in aniFriis-Christensen and Larsen 1991...





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