Equivalence of Three Allocation Currencies as Estimates of Reproductive Allocation and Somatic Cost of Reproduction in Pinguicula vulgaris

M. Méndez; P. S. Karlsson

doi:10.1055/s-2007-964965

Plant Biology, Table of Contents

Plant Biol (Stuttg) 2007; 9(4): 462-468
DOI: 10.1055/s-2007-964965

Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Equivalence of Three Allocation Currencies as Estimates of Reproductive Allocation and Somatic Cost of Reproduction in Pinguicula vulgaris

M. Méndez¹ ^, ² ^, ³ , P. S. Karlsson¹ ^, ⁴ ^, ⁵

¹Department of Plant Ecology - Evolutionary Biology Center, Uppsala University, Villavägen 14, 752 36 Uppsala, Sweden
²Botanical Institute, Stockholm University, Lilla Frescativägen 5, 106 91 Stockholm, Sweden
³Present address: Área de Biodiversidad y Conservación, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, c/Tulipán s/n, 28933 Móstoles, Spain
⁴Abisko Scientific Research Station, Royal Academy of Science, 981 07 Abisko, Sweden
⁵Present address: Swedish Research Council, 111 56 Stockholm, Sweden

Abstract

Which is the most appropriate currency (biomass, energy, water, or some mineral nutrient) for expressing resource allocation in plants has been repeatedly discussed. Researchers need to assess to which extent interindividual, interpopulational, or interspecific comparisons of resource allocation could be affected by the allocation currency chosen. The “currency issue” is relevant to at least three related aspects of resource allocation to reproduction: (a) reproductive allocation (RA), (b) size-dependence of reproductive allocation, and (c) somatic cost of reproduction (SCR). Empirical tests have mostly dealt with the first aspect only. We examined the equivalence of estimates for the three aspects above across three different allocation currencies (dry mass, N, P) in 11 populations of Pinguicula vulgaris. For RA we studied the equivalence of allocation currencies at three scales: among individuals of the same population, between populations of the same species, and among species. Equivalence of currencies in the ranking of RA for individuals within populations was high (R_s ≥ 0.43) and did not strongly decrease when comparing populations or species. Excepting for size-dependence of RA, ranking of RA, or SCR between populations was equivalent for biomass and N, but not for P. Our study gives two positive guidelines for empirical plant reproductive ecologists facing the “currency issue”: (1) become increasingly concerned about the “currency issue” as you increase the scale of your comparison from individuals to populations to species, and (2) avoid estimating allocation in redundant currencies (biomass and N in our case) and choose preferentially “complementary” currencies that provide a broader view of allocation patterns (biomass and P in our case).

Key words

Allocation currency - intraspecific comparison - Pinguicula vulgaris - reproductive allocation - size-dependence - somatic cost of reproduction

Full Text

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M. Méndez

Área de Biodiversidad y Conservación
Escuela Superior de Ciencias Experimentales y Tecnología
Universidad Rey Juan Carlos

c/Tulipán s/n

28933 Móstoles

Spain

Email: marcos.mendez@urjc.es

Editor: H. de Kroon