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Patterns of Annual Seed Production by Northern Hemisphere Trees: A Global Perspective.
MedLine Citation:
PMID:  10657177     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We tested whether annual seed production (masting or mast fruiting) in Northern Hemisphere trees is an evolved strategy or a consequence of resource tracking by comparing masting patterns with those of annual rainfall and mean summer temperatures, two environmental variables likely to correlate with available resources. There were generally significant negative autocorrelations between the seed crop in year x and year x+1 (year x+2 in species of Quercus requiring 2 yr to mature acorns), as expected if resources are depleted in mast years in part by switching resources from growth to reproduction. Spatial autocorrelation in annual seed production generally declined with distance but was statistically significant over large geographic areas. Variability in annual seed production was relatively high and inversely correlated with latitude and generally not bimodally distributed. Patterns of spatial autocorrelation in annual rainfall and summer temperatures are generally similar to those exhibited by annual seed production, and relative variability in annual rainfall is also inversely correlated with latitude. However, these environmental variables exhibit distinctly different patterns of temporal autocorrelation, are much less variable, and are more normally distributed than annual seed production. Combined with the inverse relationship between growth and reproduction previously documented, these results support the hypothesis that variability in annual seed production is an evolved strategy and that annual seed production is more or less normally distributed rather than an all-or-none phenomenon.
Authors:
Koenig; Knops
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Publication Detail:
Type:  JOURNAL ARTICLE    
Journal Detail:
Title:  The American naturalist     Volume:  155     ISSN:  1537-5323     ISO Abbreviation:  Am. Nat.     Publication Date:  2000 Jan 
Date Detail:
Created Date:  2000-02-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984688R     Medline TA:  Am Nat     Country:  -    
Other Details:
Languages:  ENG     Pagination:  59-69     Citation Subset:  -    
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