Ecosystems

, Volume 18, Issue 5, pp 914–931 | Cite as

Macrophyte Complexity Controls Nutrient Uptake in Lowland Streams

  • Peter S. Levi
  • Tenna Riis
  • Anette B. Alnøe
  • Marc Peipoch
  • Kamilla Maetzke
  • Christoffer Bruus
  • Annette Baattrup-Pedersen
Article

Abstract

Macrophytes act as ecosystem engineers in lowland stream ecosystems, enhancing habitat complexity and physical structure. Studies have demonstrated that macrophyte abundance and growth form can dictate the degree to which physical and biological stream characteristics are altered. However, few studies have investigated the influence of macrophytes and their species-specific variation in morphological complexity on functional processes, such as nutrient uptake. We injected 15N-labeled ammonium (15N-NH4+) into four macrophyte-rich lowland streams in Denmark to quantify the uptake of NH4+ by macrophytes, epiphytic biofilms, benthic biofilms, and suspended particulate organic matter in the water column. Overall, macrophytes and their epiphytic biofilms accounted for 71–98% of the reach-weighted uptake across the study streams. While macrophytes had the highest rates of NH4+ uptake among the compartments we measured, the epiphytic biofilms had the highest uptake efficiency, ranging from 0.06 to 0.6 mg N mg Nbiomass−1 d−1. Among all compartments, the uptake efficiency was inversely related to the carbon-to-nitrogen ratio. Macrophyte complexity, expressed as leaf perimeter-to-area ratio (P:A), varied among the five species found in the study streams. The uptake rates by macrophyte species with high leaf P:A were, on average, an order of magnitude higher than the rates for species with simple leaf morphology (430 vs. 49 mg N m−2 d−1). In summary, our results indicate that macrophytes regulate stream function both via direct uptake of NH4+ from the water column and by providing a substrate for epiphytic biofilms. Furthermore, the effect of leaf architecture on nutrient uptake rates provides evidence that physical complexity can enhance ecosystem function.

Keywords

submerged aquatic vegetation epiphyton 15N-NH4+ stable isotope nitrogen ecosystem function habitat complexity heterogeneity 

Supplementary material

10021_2015_9872_MOESM1_ESM.docx (16 kb)
Supplementary material 1 (DOCX 16 kb)

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Peter S. Levi
    • 1
    • 2
  • Tenna Riis
    • 1
  • Anette B. Alnøe
    • 1
  • Marc Peipoch
    • 3
    • 4
  • Kamilla Maetzke
    • 1
  • Christoffer Bruus
    • 1
  • Annette Baattrup-Pedersen
    • 1
  1. 1.Department of BioscienceAarhus UniversityAarhusDenmark
  2. 2.Center for LimnologyUniversity of Wisconsin-MadisonMadisonUSA
  3. 3.Centre d’Estudis-Avancats de Blanes (CEAB-CSIC)BlanesSpain
  4. 4.Montana Institute on Ecosystems, Division of Biological SciencesUniversity of MontanaMissoulaUSA

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