LILLY THAYER BOT 437 SPRING 2009 Algal Community Succession.

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  • LILLY THAYERBOT 437SPRING 2009Algal Community Succession

  • Ecological Succession: Changes in the species composition.often predictable and usually follows an orderly stepwise pattern

    Primary Succession: No living organismslava flow or glacial ice-scour.

    Secondary Succession: Life, or potential lifewildfire, deforestation, or hurricane

  • Light, temp., day length, nutrients, previous species, etc.

  • Effect of Fertilization Short-term effects on algal colonization, abundance, and species composition of nitrogen and phosphorous fertilizers. (McClanahan, 2007)

    Past studies show increased:PhotosynthesisGrowth ratesBiomass

    Phosphorous most limiting?

  • Study 2 succession in natural habitatGlovers Reef, Belize

    Imitates pollution with fishingOnly small herbivorous fish

    Distinguish effects of N and P

  • Study Design4 treatments (N, P, N+P, Control)

    Plates of dead coralTests 2 succession

    Record small fish herbivory ratesExcluded large herbivorous fish and urchins

    Record algal biomass, plate cover, and diversity

  • ResultsNo significant fertilization effect on algal biomass (McClanahan, 2007)

  • ResultsControl treatment had more taxa than fertilized treatments (McClanahan, 2007)

    Pure P least diversity

    Turf algal cover Only type to respond to fertilizationLowest in pure PDid not increase with increasing NCo-limitation

    = Control = N + P = P = N

  • ConclusionEffect of high P similar to effect of high herbivoryGives competitive edge to cyanobacteria

    Taxa-specific responses to the two nutrients but nitrogen and phosphorous are co-limiting to turf algal cover (McClanahan, 2007)

    More diversity in mixed N and P treatments than pure

    Large imbalance in micronutrients ratios will reduce biodiversity more than just increased [N] (McClanahan, 2007)

  • Works CitedAguilara, Moiss; Navarrete, Sergio. 2007. Effects of Chiton granosus (Frembly, 1827) and other molluscan grazers on algal succession in wave exposed mid-intertidal rocky shores of central Chile. Journal of Experimental Marine Biology and Ecology. 349: 84-98.

    Bruce, Louise, et. al. 2009. The role of zooplankton in the ecological succession of plankton and benthic algae across a salinity gradient in the Shark Bay salt ponds. Hydrobiologia. 626: 111-128.Fricke, Anna, et.al. 2007. Natural succession of macroalgal-dominated epibenthic assemblages at different water depths and after transplantation from deep to shallow water on Spitsbergen. Polar Biology. 31: 1191-1203.Kraufvelin, Patrik, et. al. 2007. Winter colonisation and succession of filamentous macroalgae on artificial substrates and possible relationships to Fucus vesiculosus. Estuarine, Coastal and Shelf Science. 72: 665-674.McClanahan, T.R., et. al. 2007. Effect of nitrogen, phosphorous, and their interaction on coral reef algal succession in Glovers Reef, Belize. Marine Pollution Bulletin. 54: 1947-1957.Olabarria, C., et. al. 207. Succession of macrofauna on macroalgal wrack of an exposed Sandy beach: Effects of patch size and site. Marine Environmental Research. 63: 19-40. Petraitis, Peter; Dudgeon, Steve. 2005. Divergent succession and implications for alternative states on rocky intertidal shores. Journal of Experimental Marine Biology and Ecology. 326: 14-26.

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