Sex allocation in California oaks: trade-offs or resource tracking?

Trade-offs in sex resource allocation are commonly inferred from a negative correlation between male and female reproduction. We found that for three California oak species, aboveground annual net productivity (ANP) differences among individuals were primarily correlated with water availability and...

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Veröffentlicht in:PloS one 2012-08, Vol.7 (8), p.e43492-e43492
Hauptverfasser: Knops, Johannes M H, Koenig, Walter D
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description Trade-offs in sex resource allocation are commonly inferred from a negative correlation between male and female reproduction. We found that for three California oak species, aboveground annual net productivity (ANP) differences among individuals were primarily correlated with water availability and soil fertility. Reproductive biomass increased with ANP, but the relative allocation to reproduction was constant, indicating that reproduction tracked productivity, which in turn tracked site quality. Although there was a negative correlation between male and female reproduction, this was not the result of a resource investment trade-off, but rather a byproduct of the positive correlation between female reproductive biomass and ANP combined with the greater overall resource allocation to female, compared to male, function. Thus, we reject the hypothesis of a trade-off between these key life-history components within individuals of these species. For long-lived individuals, a plastic resource tracking response to environmental fluctuations may be more adaptive than directly linking life-history traits through trade-offs.
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subjects Biological Evolution
Biology
Biomass
California
Correlation
Efficiency
Environment
Environmental aspects
Females
Hypotheses
Life history
Magnoliophyta
Males
Models, Genetic
Neurosciences
Oaks
Phenotype
Physiological aspects
Plant Physiological Phenomena
Plant reproduction
Plant sciences
Plastics
Productivity
Quercus
Quercus - genetics
Quercus lobata
Reproduction
Reproduction (biology)
Reproduction - physiology
Resource allocation
Seeds
Sex
Sexual reproduction
Soil
Soil fertility
Soil sciences
Soil water
Tracking
Tradeoffs
Trees
Water
Water availability
title Sex allocation in California oaks: trade-offs or resource tracking?
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