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Protocol for Acute and Chronic Ecotoxicity Testing of the Turquoise Killifish Nothobranchius furzeri
09:43

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Published on: April 24, 2018

Invasive aquarium fish transform ecosystem nutrient dynamics.

Krista A Capps1, Alexander S Flecker

  • 1Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, USA. kac98@cornell.edu

Proceedings. Biological Sciences
|August 23, 2013
PubMed
Summary
This summary is machine-generated.

Invasive aquarium fish can alter ecosystems. This study shows phosphorus-rich catfish significantly changed nutrient dynamics in a Mexican river, highlighting species-specific stoichiometry for invasion risk assessment.

Keywords:
Loricariidaeaquarium tradeinvasive speciesnutrient remineralizationphosphorus

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Area of Science:

  • Ecology
  • Aquatic Ecology
  • Invasive Species Biology

Background:

  • The global trade in ornamental aquatic species introduces non-native fishes, posing risks to novel ecosystems.
  • Invasive aquarium species can disrupt ecosystem functions, yet risk assessment is limited for most.
  • Ecological stoichiometry offers a framework to predict invasion impacts on ecosystem processes.

Purpose of the Study:

  • To utilize ecological stoichiometry to identify aquarium invaders with the potential to alter ecosystem processes.
  • To investigate the impact of an invasive, phosphorus (P)-rich catfish on stream nutrient dynamics in southern Mexico.

Main Methods:

  • Assessed the ecological stoichiometry of an invasive catfish population.
  • Quantified changes in nutrient storage and remineralization rates in the invaded river.
  • Compared elemental dynamics (phosphorus and nitrogen) between native and invasive species.

Main Results:

  • The invasive P-rich catfish population exhibited explosive growth, significantly altering stream nutrient dynamics.
  • Invasive fish acted as net sinks for phosphorus and net remineralizers of nitrogen.
  • Observed elemental changes varied, with P-rich fish uniquely impacting P and N cycles.

Conclusions:

  • Species-specific stoichiometry is crucial for understanding how invasive species alter nutrient dynamics.
  • Invasive species with unique elemental compositions can substantially modify ecosystem functions.
  • Incorporating body stoichiometry into risk analyses can improve predictions of invasion impacts on ecosystems.