Phytoplankton species richness, evenness, and production in relation to nutrient availability and imbalance

We used natural phytoplankton communities from four coastal regions to test diversity‐functioning relationships, relations of N2‐fixing cyanobacteria to nutrient imbalance, and the importance of metacommunity dynamics. Resource availability was measured as total nitrogen and phosphorus. Resource imbalance was determined as (1) the ratio of dissolved inorganic nitrogen to total phosphorus and (2) an experimentally verified indicator quantified by modelling responses in 14C‐based primary production to nutrient additions. Resource availability explained variance in biomass, productivity, and species richness, as expected by the Species Energy Theory, but not evenness. Linear mixed‐effects models confirmed the overall relation between productivity and resource availability, whereas other resource availability relations showed also notable clustering by region. The Resource Ratio Theory predicting that diversity increases with the number of limiting resources was not supported. Nutrient imbalance had a weak effect on the biomass of N2‐fixing cyanobacteria, but not their share of total phytoplankton biomass. Contrary to many previous studies on biodiversity‐ecosystem functioning relationships, we found a highly significant inverse relationship between evenness and biomass. This indicates that species‐rich natural phytoplankton communities form the basis for opportunistic species to temporarily monopolize resources and create blooms. The result was consistent across regions, although their community composition differed. Metacommunity dynamics were important, since distance between the regions explained higher percentage of the variability than local resources together. As the species able to monopolize resources vary widely in their role for aquatic food webs and environmental consequences (e.g., food quality, toxicity), species‐level trait data is essential to understand better diversity‐productivity relationships.

• Publication year

  2017

• Venue

  Limnology and Oceanography

• Publication date

  2017-07-01

• Fields of study

  Biology, Environmental Science

• Identifiers
  DOI 10.1002/lno.10506
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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