IngentaConnect A phyletic perspective on the allometry of plant biomass-partitio...

Abstract:

Contents

• Summary 27

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Introduction 28

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Statistical considerations 30

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Phyletic considerations and the null hypothesis 31

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Observable biomass-partitioning patterns 32

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Two intraspecific digressions 34

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The functional equivalence hypothesis 35

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Plato's cave 38

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Conclusions 38

• Acknowledgements 39

• References 39 Summary

Biomass-partitioning patterns influence the functioning of aquatic and terrestrial vegetation at all levels, ranging from individual growth and reproduction to the flow of mass and energy through entire communities. For this reason, leaf, stem and root dry biomass-partitioning patterns across taxonomically and ecologically diverse seed plants (spermatophytes) have been intensively investigated, both empirically and theoretically. By contrast, phyletically disparate plants (e.g. green and brown algal macrophytes, mosses and pteridophytes) have not been examined to determine whether the partitioning of their body parts into `leaf', `stem' and `root' analogs accords with that of spermatophytes. In this review, the biomass-partitioning patterns of siphonous and brown algal macrophytes, mosses and pteridophytes were compared allometrically with those of spermatophytes and were shown to be largely in statistical accordance (thus lending support to the hypothesis that a single scaling relationship exists across eukaryotic photoautotrophs). This concordance is argued to support the hypothesis of functional equivalence across analogous, but developmentally different, body parts, a feature that permits the use of simpler biological model systems with which to derive analytical explanations for the biomass-partitioning patterns reported for more complex seed plants.

New Phytologist (2006) 171: 27- 40

doi: 10.1111/j.1469-8137.2006.01760.x

A phyletic perspective on the allometry of plant biomass-partitioning patterns and functionally equivalent organ-categories