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Allowing macroalgae growth forms to emerge: Use of an agent-based model to understand the growth and spread of macroalgae in Florida coral reefs, with emphasis on Halimeda tuna

Author

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  • Yñiguez, Aletta T.
  • McManus, John W.
  • DeAngelis, Donald L.

Abstract

The growth patterns of macroalgae in three-dimensional space can provide important information regarding the environments in which they live, and insights into changes that may occur when those environments change due to anthropogenic and/or natural causes. To decipher these patterns and their attendant mechanisms and influencing factors, a spatially explicit model has been developed. The model SPREAD (SPatially-explicit Reef Algae Dynamics), which incorporates the key morphogenetic characteristics of clonality and morphological plasticity, is used to investigate the influences of light, temperature, nutrients and disturbance on the growth and spatial occupancy of dominant macroalgae in the Florida Reef Tract. The model species, Halimeda and Dictyota spp., are modular organisms, with an “individual” being made up of repeating structures. These species can also propagate asexually through clonal fragmentation. These traits lead to potentially indefinite growth and plastic morphology that can respond to environmental conditions in various ways. The growth of an individual is modeled as the iteration of discrete macroalgal modules whose dynamics are affected by the light, temperature, and nutrient regimes. Fragmentation is included as a source of asexual reproduction and/or mortality. Model outputs are the same metrics that are obtained in the field, thus allowing for easy comparison. The performance of SPREAD was tested through sensitivity analysis and comparison with independent field data from four study sites in the Florida Reef Tract. Halimeda tuna was selected for initial model comparisons because the relatively untangled growth form permits detailed characterization in the field. Differences in the growth patterns of H. tuna were observed among these reefs. SPREAD was able to closely reproduce these variations, and indicate the potential importance of light and nutrient variations in producing these patterns.

Suggested Citation

  • Yñiguez, Aletta T. & McManus, John W. & DeAngelis, Donald L., 2008. "Allowing macroalgae growth forms to emerge: Use of an agent-based model to understand the growth and spread of macroalgae in Florida coral reefs, with emphasis on Halimeda tuna," Ecological Modelling, Elsevier, vol. 216(1), pages 60-74.
  • Handle: RePEc:eee:ecomod:v:216:y:2008:i:1:p:60-74
    DOI: 10.1016/j.ecolmodel.2008.04.016
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    Citations

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    Cited by:

    1. Yñiguez, Aletta T. & McManus, John W. & Collado-Vides, Ligia, 2015. "Consequences of morphological plasticity and fragmentation on space occupation of coral reef macroalgae," Ecological Modelling, Elsevier, vol. 309, pages 128-142.
    2. Yurek, Simeon & Eaton, Mitchell J. & Lavaud, Romain & Laney, R. Wilson & DeAngelis, Donald L. & Pine, William E. & La Peyre, Megan & Martin, Julien & Frederick, Peter & Wang, Hongqing & Lowe, Michael , 2021. "Modeling structural mechanics of oyster reef self-organization including environmental constraints and community interactions," Ecological Modelling, Elsevier, vol. 440(C).
    3. Canal-Vergés, Paula & Potthoff, Michael & Hansen, Flemming Thorbjørn & Holmboe, Nikolaj & Rasmussen, Erik Kock & Flindt, Mogens R., 2014. "Eelgrass re-establishment in shallow estuaries is affected by drifting macroalgae – Evaluated by agent-based modeling," Ecological Modelling, Elsevier, vol. 272(C), pages 116-128.
    4. Oborny, B. & Mony, C. & Herben, T., 2012. "From virtual plants to real communities: A review of modelling clonal growth," Ecological Modelling, Elsevier, vol. 234(C), pages 3-19.
    5. Glynn, Peter J & Glynn, Peter W & Maté, Juan & Riegl, Bernhard, 2020. "Agent-based model of Eastern Pacific damselfish and sea urchin interactions shows increased coral reef erosion under post-ENSO conditions," Ecological Modelling, Elsevier, vol. 423(C).

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