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Structuring pelagic trophic networks from the biomass size spectra

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  • Cózar, Andrés
  • García, Carlos M.
  • Gálvez, José A.
  • Echevarría, Fidel

Abstract

The selection and establishment of the structure (number and compartments, aggregation criteria, and trophic links) of the food webs is a critical task in trophic modelling. The present work proposes a systematic method to structure trophic networks in pelagic food webs. The biomass-size spectrum (BSS) is a well-established approach to analyze the structure of pelagic communities, and the body size is especially related to the ecological role of the organisms in the pelagic environment. To structure food webs, this work uses detailed arrangements of the community in size classes with increasing widths (like Sheldon-type BSS) as first aggregation criteria, and BSS theory as a framework to integrate the available knowledge about feeding selectivity in order to obtain a method to identify the trophic links between compartments. Diet composition matrices were estimated through the combination of a probability of encounter for each food type and a specific probability of ingestion related to the food size selectivity and other food quality characteristics (e.g., morphology and nutritional quality). The feasibility of this approach has been illustrated through data of size-structured communities extracted from the literature including different planktonic predator guilds (nanoflagellates, cladoceran-dominated zooplankton and copepod-dominated zooplankton) in a high mountain lake (La Caldera, Spain), two subtropical wetland lakes (meso-oligotrophic Laguna Galarza and eutrophic Laguna Iberá, Argentina) and a marine microcosm (Alborán Sea, Mediterranean). The identification of “who eats whom” and “by how much” also allows for more accurate analyses of the trophic control in the BSS. Extensive analyses of the balance between top-down and bottom-up controls were developed for the feeding interactions of the study cases.

Suggested Citation

  • Cózar, Andrés & García, Carlos M. & Gálvez, José A. & Echevarría, Fidel, 2008. "Structuring pelagic trophic networks from the biomass size spectra," Ecological Modelling, Elsevier, vol. 215(4), pages 314-324.
  • Handle: RePEc:eee:ecomod:v:215:y:2008:i:4:p:314-324
    DOI: 10.1016/j.ecolmodel.2008.02.038
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    References listed on IDEAS

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    1. Fath, Brian D., 2007. "Structural food web regimes," Ecological Modelling, Elsevier, vol. 208(2), pages 391-394.
    2. Fath, Brian D. & Scharler, Ursula M. & Ulanowicz, Robert E. & Hannon, Bruce, 2007. "Ecological network analysis: network construction," Ecological Modelling, Elsevier, vol. 208(1), pages 49-55.
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