Oecologia

, Volume 162, Issue 4, pp 941–949

Nitrogen fluxes from treefrogs to tank epiphytic bromeliads: an isotopic and physiological approach

  • Gustavo Q. Romero
  • Fausto Nomura
  • Ana Z. Gonçalves
  • Natacha Y. N. Dias
  • Helenice Mercier
  • Elenice de C. Conforto
  • Denise de C. Rossa-Feres
Plant-Animal interactions - Original Paper

Abstract

Diverse invertebrate and vertebrate species live in association with plants of the large Neotropical family Bromeliaceae. Although previous studies have assumed that debris of associated organisms improves plant nutrition, so far little evidence supports this assumption. In this study we used isotopic (15N) and physiological methods to investigate if the treefrog Scinax hayii, which uses the tank epiphytic bromeliad Vriesea bituminosa as a diurnal shelter, contributes to host plant nutrition. In the field, bromeliads with frogs had higher stable N isotopic composition (δ15N) values than those without frogs. Similar results were obtained from a controlled greenhouse experiment. Linear mixing models showed that frog feces and dead termites used to simulate insects that eventually fall inside the bromeliad tank contributed, respectively, 27.7% (±0.07 SE) and 49.6% (±0.50 SE) of the total N of V. bituminosa. Net photosynthetic rate was higher in plants that received feces and termites than in controls; however, this effect was only detected in the rainy, but not in the dry season. These results demonstrate for the first time that vertebrates contribute to bromeliad nutrition, and that this benefit is seasonally restricted. Since amphibian–bromeliad associations occur in diverse habitats in South and Central America, this mechanism for deriving nutrients may be important in bromeliad systems throughout the Neotropics.

Keywords

Bromeliad-frog interactions Digestive mutualism Nutrient provisioning Tillandsioideae Scinax hayii 

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Gustavo Q. Romero
    • 1
  • Fausto Nomura
    • 2
  • Ana Z. Gonçalves
    • 3
  • Natacha Y. N. Dias
    • 4
  • Helenice Mercier
    • 5
  • Elenice de C. Conforto
    • 1
  • Denise de C. Rossa-Feres
    • 1
  1. 1.Departamento de Zoologia e Botânica, IBILCEUniversidade Estadual Paulista (UNESP)São José do Rio PretoBrazil
  2. 2.Departamento de Ecologia, ICBUniversidade Federal de Goiás (UFG)GoiâniaBrazil
  3. 3.Pós-Graduação em Ecologia, Instituto de BiologiaUniversidade Estadual de Campinas (UNICAMP)CampinasBrazil
  4. 4.Pós-Graduação em Biologia AnimalUniversidade Estadual Paulista (UNESP)São José do Rio PretoBrazil
  5. 5.Departamento de Botânica, Instituto de BiociênciasUniversidade de São Paulo (USP)São PauloBrazil

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