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Titolo:
A METHOD TO ADJUST SIMULTANEOUSLY FOR SPATIAL MICROSITE AND COMPETITION EFFECTS
Autore:
MAGNUSSEN S;
Indirizzi:
ENVIRONM CANADA,CANADIAN FORESTRY SERV,PETAWAWA NATL FORESTRY INST CHALK RIVER K0J 1J0 ONTARIO CANADA
Titolo Testata:
Canadian journal of forest research
fascicolo: 5, volume: 24, anno: 1994,
pagine: 985 - 995
SICI:
0045-5067(1994)24:5<985:AMTASF>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVEN-AGED MONOCULTURES; PLANT MONOCULTURES; FIELD TRIALS; JACK PINE; PLOTS; COVARIANCES; EFFICIENCY; VARIANCES; SELECTION; GENETICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
S. Magnussen, "A METHOD TO ADJUST SIMULTANEOUSLY FOR SPATIAL MICROSITE AND COMPETITION EFFECTS", Canadian journal of forest research, 24(5), 1994, pp. 985-995

Abstract

A patchy microsite mosaic gives rise to positive spatial correlationsamong first-order neighbors in field trials. Competition for a resource in short supply tends to enhance size differences among first-orderneighbors. Simulation studies demonstrated that positive spatial autocorrelations will seriously inflate family variance components and, thus, the individual narrow sense heritability in sib trials with multiunit plots in randomized complete block designs. Moderate levels of competition between first-order neighbors had the effect of lowering thisinflation. Results from simulated single-tree plot designs were neverbiased. In the absence of strong competition, this design type is clearly preferable. An effective method for adjusting results obtained from multiunit plot designs is presented. Adjusted values of family variances and heritabilities were within 6% of the true values in two of three simulations. Adjustments are based on an iterative nearest neighbor (NN) regression on family values and a NN adjustment of ANOVA residuals. An application of the NN adjustments to height and diameter datain a jack pine (Pinus banksiana Lamb.) sib test lowered heritabilities of height to the expected level and indicated similar levels of genetic control of the two traits.

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Documento generato il 05/12/20 alle ore 00:46:42