LILLY THAYER BOT 437 SPRING 2009 Algal Community Succession.
Post on 17-Jan-2016
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.