Oecologia

, Volume 167, Issue 3, pp 835–845 | Cite as

Bromeliad growth and stoichiometry: responses to atmospheric nutrient supply in fog-dependent ecosystems of the hyper-arid Atacama Desert, Chile

  • Angélica L. González
  • José Miguel Fariña
  • Raquel Pinto
  • Cecilia Pérez
  • Kathleen C. Weathers
  • Juan J. Armesto
  • Pablo A. Marquet
Ecosystem ecology - Original Paper

Abstract

Carbon, nitrogen, and phosphorus (C, N, P) stoichiometry influences the growth of plants and nutrient cycling within ecosystems. Indeed, elemental ratios are used as an index for functional differences between plants and their responses to natural or anthropogenic variations in nutrient supply. We investigated the variation in growth and elemental content of the rootless terrestrial bromeliad Tillandsia landbeckii, which obtains its moisture, and likely its nutrients, from coastal fogs in the Atacama Desert. We assessed (1) how fog nutrient supply influences plant growth and stoichiometry and (2) the response of plant growth and stoichiometry to variations in nutrient supply by using reciprocal transplants. We hypothesized that T. landbeckii should exhibit physiological and biochemical plastic responses commensurate with nutrient supply from atmospheric deposition. In the case of the Atacama Desert, nutrient supply from fog is variable over space and time, which suggests a relatively high variation in the growth and elemental content of atmospheric bromeliads. We found that the nutrient content of T. landbeckii showed high spatio-temporal variability, driven partially by fog nutrient deposition but also by plant growth rates. Reciprocal transplant experiments showed that transplanted individuals converged to similar nutrient content, growth rates, and leaf production of resident plants at each site, reflecting local nutrient availability. Although plant nutrient content did not exactly match the relative supply of N and P, our results suggest that atmospheric nutrient supply is a dominant driver of plant growth and stoichiometry. In fact, our results indicate that N uptake by T. landbeckii plants depends more on N supplied by fog, whereas P uptake is mainly regulated by within-plant nutrient demand for growth. Overall, these findings indicate that variation in fog nutrient supply exerts a strong control over growth and nutrient dynamics of atmospheric plants, which are ubiquitous across fog-dominated ecosystems.

Keywords

Atmospheric deposition Ephiphytes Growth rate Nitrogen Nutrient ratios Nutrient supply Phosphorus 

Supplementary material

442_2011_2032_MOESM1_ESM.pdf (128 kb)
Supplementary material 1 (PDF 128 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Angélica L. González
    • 1
    • 2
  • José Miguel Fariña
    • 1
    • 4
  • Raquel Pinto
    • 5
  • Cecilia Pérez
    • 1
    • 2
  • Kathleen C. Weathers
    • 6
  • Juan J. Armesto
    • 1
    • 2
  • Pablo A. Marquet
    • 1
    • 2
    • 3
  1. 1.Departamento de Ecología, Center for Advanced Studies in Ecology and Biodiversity (CASEB)Pontificia Universidad Católica de ChileSantiagoChile
  2. 2.Institute of Ecology and Biodiversity (IEB)SantiagoChile
  3. 3.The Santa Fe InstituteSanta FeUSA
  4. 4.Department of Ecology and Evolutionary BiologyBrown UniversityProvidenceUSA
  5. 5.Universidad Arturo PratIquiqueChile
  6. 6.Cary Institute of Ecosystem StudiesMillbrookUSA

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