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But that is not true in every case in some

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But that is NOT true in every case, in some environment, taking away just one importantcomponent can undermine the entire ecosystem. Take coral reefs for instance, many organisms in areef are dependent on the coral, it provides key microhabitat, shelter, and breeding ground forthousands of species of fish, crustaceans, and mollusks. Corals also form interdependentrelationships with fungiFigure 1.1 Three levels of biodiversitySource: Source: -biodiversity-53714954
18Here are some enrichment activities for yOUto work on tomaster and strengthen the basic concepts yOUhave learnedfrom this lesson.and bacteria. The coral itself is a loom that allows the tangled net of biodiversity to be woven, thatmakes coral a keystone organism, one that many others depend on for survival.So, what happens when destructive fishing practices, pollution and ocean acidification weakencoral or even kill it altogether? ---- Exactly what you might think, the lost of these keystone speciesleads its dependents at a lost too, threatening the entire fabric of the reef. Ecosystem, Species andGenetic diversity together form the complex tangled web of biodiversity that is vital for the survival oforganisms on earth.We humans are into this biodiversity too. When just a few strands are lost, our own well beingis threatened. Cut too many links and we risk unraveling it all. What the future brings isunpredictable, but biodiversity can give us insurancepolicy, Earth’s own safety net to safeguard oursurvival. “Biodiversity IndicesSpecies Richnessrefers to the number of species in a particular place. Species Evenness refers tothe extent to which individuals are distributed evenly among species.Relative Abundancerefers to the number of individuals in a species divided by the total number ofall species.Simpson’s Indexcombines measures of species richness and species evenness.Activity 7.1 Which Ecosystem is More Diverse?Objective:Measure the richness, evenness, and relative abundance of species in a community.Calculating Biodiversity IndicesEcologists use biodiversity indices to determine if a community or ecosystem is diverse; speciesrichness, relative abundance, Shannon-Weiner Index, species evenness, and Simpson Index.Ecologists will use more than one index to calculate the level of diversity. In this activity, we will usespecies richness and relative abundance.Example Community 1:Species Richness = 4Relative Abundance of Species A = 5/20 = 25%Relative Abundance of Species B = 5/20 = 25%Relative Abundance of Species C = 5/20 = 25%Relative Abundance of Species D = 5/20 = 25%Community 2:Species Richness = 4Relative Abundance of Species A = 16/20 = 8Relative Abundance of Species B = 1/20 = 5Relative Abundance of Species C = 1/20 = 5Relative Abundance of Species D = 2/20 = 10

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