Ecosystems

, Volume 18, Issue 8, pp 1455–1471 | Cite as

Effect of Chronic Versus Pulse Perturbations on a Marine Ecosystem: Integration of Functional Responses Across Organization Levels

  • Fernando Tuya
  • Séfora Betancor
  • María A. Viera-Rodríguez
  • Rayco Guedes
  • Rodrigo Riera
  • Ricardo Haroun
  • Fernando Espino
Article

Abstract

Human impacts accelerate the intensity and frequency of perturbations on ecosystems; approaches that integrate responses across organization levels are, however, lacking, particularly in the ocean. We experimentally simulated the frequency of fertilization (‘chronic’ versus ‘pulse’ events) in orthogonal combinations of two intensities (‘large’ versus ‘moderate’ fertilization) to determine physiological and biological responses by the seagrass Cymodocea nodosa and associated flora (epiphytes and green seaweeds, specifically Caulerpa prolifera), as well as functional changes (community primary and secondary productivity) at the ecosystem level. We predicted that the absence of recovery time from chronic perturbation would more severely affect responses at population and ecosystem levels relative to discrete events (pulses). Nutrient enrichment increased the biomass of C. prolifera irrespective of its frequency, whereas seagrass biomass and shoot density particularly decreased under a chronic scenario. These demographic responses were connected with varying photo-physiological performance of both C. nodosa and C. prolifera. Fertilization, regardless of its intensity and frequency, decreased the maximum photosynthetic rate of C. nodosa, concomitant with increased pigments, particularly under chronic fertilization, and decreased photoprotective (phenols) compounds. In contrast, fertilization boosted the maximum photochemical yield of C. prolifera, in addition to an increase in pigments and photoprotective compounds. Community primary and secondary productivity, however, did not vary under fertilization of varying intensity and frequency. In summary, fertilization precipitated population-level changes in physiological and biological attributes of vegetation. However, fertilization effects did not entirely cascade into ecosystem-level processes, that is, ecosystem productivity, which suggests a functional compensation (that is, increased algal performance to offset losses of seagrass production) during the initial stages of fertilization.

Keywords

nutrients ecosystem perturbation frequency of perturbation marine vegetation temporal variability marine angiosperms green macroalgae Atlantic Ocean 

Supplementary material

10021_2015_9911_MOESM1_ESM.docx (278 kb)
Supplementary material 1 (DOCX 277 kb)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Fernando Tuya
    • 1
  • Séfora Betancor
    • 1
  • María A. Viera-Rodríguez
    • 1
  • Rayco Guedes
    • 2
  • Rodrigo Riera
    • 3
    • 4
  • Ricardo Haroun
    • 1
  • Fernando Espino
    • 1
  1. 1.Grupo en Biodiversidad y Conservación, ECOAQUAUniversidad de Las Palmas de Gran CanariaLas PalmasSpain
  2. 2.Departamento de QuímicaUniversidad de Las Palmas de Gran CanariaLas PalmasSpain
  3. 3.Centro de Investigaciones Medioambientales del Atlántico (CIMA SL)S/C de TenerifeSpain
  4. 4.Instituto de PesquisasJardim Botanico do Rio de JaneiroRio de JaneiroBrazil

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