Modeling approach to regime shifts of primary production in shallow coastal ecosystems |
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Authors: | JM Zaldívar FS Bacelar S Dueri D Marinov P Viaroli E Hernández-García |
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Institution: | 1. European Commission, Joint Research Centre, Via E. Fermi 2749, 21020 Ispra (VA), Italy;2. IFISC, Instituto de Física Interdisciplinar y Sistemas Complejos (CSIC-UIB), Campus Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain;3. Department of Environmental Sciences, University of Parma, Viale G. P. Usberti 33/A, 43100 Parma, Italy |
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Abstract: | Pristine coastal shallow systems are usually dominated by extensive meadows of seagrass species, which are assumed to take advantage of nutrient supply from sediment. An increasing nutrient input is thought to favour phytoplankton, epiphytic microalgae, as well as opportunistic ephemeral macroalgae that coexist with seagrasses. The primary cause of shifts and succession in the macrophyte community is the increase of nutrient load to water; however, temperature plays also an important role. A competition model between rooted seagrass (Zostera marina), macroalgae (Ulva sp.), and phytoplankton has been developed to analyse the succession of primary producer communities in these systems. Successions of dominance states, with different resilience characteristics, are found when modifying the input of nutrients and the seasonal temperature and light intensity forcing. |
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Keywords: | Regime shifts Macrophytes Macroalgae |
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