Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Plant growth rates and seed size
T2 - a re-evaluation
AU - Turnbull, Lindsay A.
AU - Philipson, Christopher D.
AU - Purves, Drew W.
AU - Atkinson, Rebecca L.
AU - Cunniff, Jennifer
AU - Goodenough, Anne
AU - Hautier, Yann
AU - Houghton, Jennie
AU - Marthews, Toby R.
AU - Osborne, Colin P.
AU - Paul-Victor, Cloé
AU - Rose, Karen E.
AU - Saner, Philippe
AU - Taylor, Samuel H.
AU - Woodward, F. Ian
AU - Hector, Andy
AU - Rees, Mark
PY - 2012/6
Y1 - 2012/6
N2 - Small-seeded plant species are often reported to have high relative growth rate or RGR. However, because RGR declines as plants grow larger, small-seeded species could achieve higher RGR simply by virtue of their small size. In contrast, size-standardized growth rate or SGR factors out these size effects. Differences in SGR can thus only be due to differences in morphology, allocation, or physiology. We used nonlinear regression to calculate SGR for comparison with RGR for 10 groups of species spanning a wide range of life forms. We found that RGR was negatively correlated with seed mass in nearly all groups, but the relationship between SGR and seed mass was highly variable. We conclude that smallseeded species only sometimes possess additional adaptations for rapid growth over and above their general size advantage.
AB - Small-seeded plant species are often reported to have high relative growth rate or RGR. However, because RGR declines as plants grow larger, small-seeded species could achieve higher RGR simply by virtue of their small size. In contrast, size-standardized growth rate or SGR factors out these size effects. Differences in SGR can thus only be due to differences in morphology, allocation, or physiology. We used nonlinear regression to calculate SGR for comparison with RGR for 10 groups of species spanning a wide range of life forms. We found that RGR was negatively correlated with seed mass in nearly all groups, but the relationship between SGR and seed mass was highly variable. We conclude that smallseeded species only sometimes possess additional adaptations for rapid growth over and above their general size advantage.
KW - Life-history trade-offs
KW - Nonlinear regression
KW - Relative growth rate (RGR)
KW - Size-standardized growth rate (SGR)
U2 - 10.1890/11-0261.1
DO - 10.1890/11-0261.1
M3 - Journal article
C2 - 22834369
AN - SCOPUS:84862291042
VL - 93
SP - 1283
EP - 1289
JO - Ecology
JF - Ecology
SN - 0012-9658
IS - 6
ER -