INBREEDING IN PINUS RADIATA. II: TIME COURSE OF INBREEDING DEPRESSION AND EFFECT ON GROWTH CURVE. Wu, H., Matheson, A. C., & Spencer, D. New Zealand journal of forestry science, 1998. ![INBREEDING IN PINUS RADIATA. II: TIME COURSE OF INBREEDING DEPRESSION AND EFFECT ON GROWTH CURVE [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex Changes in the effects of inbreeding on sectional area at breast height (1.3 m) each year from ages 1 to 13 were studied in Pinus radiata D.Don of five different inbreeding levels: F = 0, outcrosses; F = 0.125, resulting from half-sib matings; F = 0.25, resulting from full-sib matings; F = 0.5, resulting from selfing; and F = 0.75, resulting from two generations of selfing. The experimental material was derived from eight founder clones. Inbreeding had a significant impact on both cumulative and annual increments in sectional area from age 3, i.e., 2 years after outplanting when most trees had reached 1.3 m in height. At age 4, trees with the highest inbreeding levels (F = 0.5 and 0.75) had significantly less sectional area increment than those with lower inbreeding levels (F = 0, 0.125, 0.25). From age 11 on, trees had differentiated into three groups: outcrosses (F = 0) were best, sib matings (F = 0.125 and 0.25) were intermediate, and selfs (F = 0.5 and 0.75) were worst for cumulative and yearly increment of sectional area. An apparent bimodal time trend in inbreeding depression (ID) of annual increment was observed, being highest at the initial stage of stand development, disappearing at about the time of crown closure in the outcrossed population, and reappearing later. This bimodal trend was believed to be associated with the different times at which crown closure began for the different inbreeding levels, and indicates that inbreeding depression is a dynamic process associated with stage of stand development, spacing, and design of field layout. In fitted Gompertz growth curves, all parameters were affected by inbreeding, including maximum growth rate, time to reach maximum growth rate, and the maximum sectional area achievable. There were significant differences in response to inbreeding among pedigrees.
@article{wu_inbreeding_1998,
title = {{INBREEDING} {IN} {PINUS} {RADIATA}. {II}: {TIME} {COURSE} {OF} {INBREEDING} {DEPRESSION} {AND} {EFFECT} {ON} {GROWTH} {CURVE}},
shorttitle = {{INBREEDING} {IN} {PINUS} {RADIATA}. {II}},
url = {https://www.semanticscholar.org/paper/INBREEDING-IN-PINUS-RADIATA.-II%3A-TIME-COURSE-OF-AND-Wu-Matheson/b06a022fa94bf2d8947e226f626ecebd67470af6},
abstract = {Changes in the effects of inbreeding on sectional area at breast height (1.3 m) each year from ages 1 to 13 were studied in Pinus radiata D.Don of five different inbreeding levels: F = 0, outcrosses; F = 0.125, resulting from half-sib matings; F = 0.25, resulting from full-sib matings; F = 0.5, resulting from selfing; and F = 0.75, resulting from two generations of selfing. The experimental material was derived from eight founder clones. Inbreeding had a significant impact on both cumulative and annual increments in sectional area from age 3, i.e., 2 years after outplanting when most trees had reached 1.3 m in height. At age 4, trees with the highest inbreeding levels (F = 0.5 and 0.75) had significantly less sectional area increment than those with lower inbreeding levels (F = 0, 0.125, 0.25). From age 11 on, trees had differentiated into three groups: outcrosses (F = 0) were best, sib matings (F = 0.125 and 0.25) were intermediate, and selfs (F = 0.5 and 0.75) were worst for cumulative and yearly increment of sectional area. An apparent bimodal time trend in inbreeding depression (ID) of annual increment was observed, being highest at the initial stage of stand development, disappearing at about the time of crown closure in the outcrossed population, and reappearing later. This bimodal trend was believed to be associated with the different times at which crown closure began for the different inbreeding levels, and indicates that inbreeding depression is a dynamic process associated with stage of stand development, spacing, and design of field layout. In fitted Gompertz growth curves, all parameters were affected by inbreeding, including maximum growth rate, time to reach maximum growth rate, and the maximum sectional area achievable. There were significant differences in response to inbreeding among pedigrees.},
urldate = {2026-09-08},
journal = {New Zealand journal of forestry science},
author = {Wu, H. and Matheson, A. C. and Spencer, D.},
year = {1998},
}
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The experimental material was derived from eight founder clones. Inbreeding had a significant impact on both cumulative and annual increments in sectional area from age 3, i.e., 2 years after outplanting when most trees had reached 1.3 m in height. At age 4, trees with the highest inbreeding levels (F = 0.5 and 0.75) had significantly less sectional area increment than those with lower inbreeding levels (F = 0, 0.125, 0.25). From age 11 on, trees had differentiated into three groups: outcrosses (F = 0) were best, sib matings (F = 0.125 and 0.25) were intermediate, and selfs (F = 0.5 and 0.75) were worst for cumulative and yearly increment of sectional area. An apparent bimodal time trend in inbreeding depression (ID) of annual increment was observed, being highest at the initial stage of stand development, disappearing at about the time of crown closure in the outcrossed population, and reappearing later. This bimodal trend was believed to be associated with the different times at which crown closure began for the different inbreeding levels, and indicates that inbreeding depression is a dynamic process associated with stage of stand development, spacing, and design of field layout. In fitted Gompertz growth curves, all parameters were affected by inbreeding, including maximum growth rate, time to reach maximum growth rate, and the maximum sectional area achievable. There were significant differences in response to inbreeding among pedigrees.","urldate":"2026-09-08","journal":"New Zealand journal of forestry science","author":[{"propositions":[],"lastnames":["Wu"],"firstnames":["H."],"suffixes":[]},{"propositions":[],"lastnames":["Matheson"],"firstnames":["A.","C."],"suffixes":[]},{"propositions":[],"lastnames":["Spencer"],"firstnames":["D."],"suffixes":[]}],"year":"1998","bibtex":"@article{wu_inbreeding_1998,\n\ttitle = {{INBREEDING} {IN} {PINUS} {RADIATA}. {II}: {TIME} {COURSE} {OF} {INBREEDING} {DEPRESSION} {AND} {EFFECT} {ON} {GROWTH} {CURVE}},\n\tshorttitle = {{INBREEDING} {IN} {PINUS} {RADIATA}. {II}},\n\turl = {https://www.semanticscholar.org/paper/INBREEDING-IN-PINUS-RADIATA.-II%3A-TIME-COURSE-OF-AND-Wu-Matheson/b06a022fa94bf2d8947e226f626ecebd67470af6},\n\tabstract = {Changes in the effects of inbreeding on sectional area at breast height (1.3 m) each year from ages 1 to 13 were studied in Pinus radiata D.Don of five different inbreeding levels: F = 0, outcrosses; F = 0.125, resulting from half-sib matings; F = 0.25, resulting from full-sib matings; F = 0.5, resulting from selfing; and F = 0.75, resulting from two generations of selfing. The experimental material was derived from eight founder clones. Inbreeding had a significant impact on both cumulative and annual increments in sectional area from age 3, i.e., 2 years after outplanting when most trees had reached 1.3 m in height. At age 4, trees with the highest inbreeding levels (F = 0.5 and 0.75) had significantly less sectional area increment than those with lower inbreeding levels (F = 0, 0.125, 0.25). From age 11 on, trees had differentiated into three groups: outcrosses (F = 0) were best, sib matings (F = 0.125 and 0.25) were intermediate, and selfs (F = 0.5 and 0.75) were worst for cumulative and yearly increment of sectional area. An apparent bimodal time trend in inbreeding depression (ID) of annual increment was observed, being highest at the initial stage of stand development, disappearing at about the time of crown closure in the outcrossed population, and reappearing later. This bimodal trend was believed to be associated with the different times at which crown closure began for the different inbreeding levels, and indicates that inbreeding depression is a dynamic process associated with stage of stand development, spacing, and design of field layout. In fitted Gompertz growth curves, all parameters were affected by inbreeding, including maximum growth rate, time to reach maximum growth rate, and the maximum sectional area achievable. There were significant differences in response to inbreeding among pedigrees.},\n\turldate = {2026-09-08},\n\tjournal = {New Zealand journal of forestry science},\n\tauthor = {Wu, H. and Matheson, A. C. and Spencer, D.},\n\tyear = {1998},\n}\n\n\n\n","author_short":["Wu, H.","Matheson, A. 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