logging in or signing up Lincoln Index anfield1 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 971 Category: Education License: All Rights Reserved Like it (3) Dislike it (0) Added: October 01, 2008 This Presentation is Public Favorites: 0 Presentation Description Estimating population size of mobile organisms Comments Posting comment... Premium member Presentation Transcript Biological Diversity : 2 factors are considered when measuring diversity: richness - the number of different kinds of species present. evenness – the similarity of the population sizes (relative abundance of species). Biological Diversity Slide 2: Both fields have the same richness (3 species) and the same total number of individuals (1000). However, Field 1 sample has more evenness than Field 2. Field 2 is less diverse than Field 1. Diversity : Diversity A community dominated by 1 or 2 species is less diverse than one in which several different species have a similar abundance. As species richness and evenness increase, so diversity increases. Calculating Diversity : Calculating Diversity The number of individuals of each species is counted e.g. by sampling random quadrats. (There is no need to identify the species, provided they can be distinguished from each other) Diversity index : Diversity index Where: D = diversity index N = total number of organisms of all species n = number of individuals of a particular species Diversity Index : Diversity Index The index is used to quantify the biodiversity of habitats. The diversity index takes into account the number of species present (richness) and the relative abundance of each species (evenness). Slide 7: Worked example: Calculating the Diversity index( D) for ground vegetation in a woodland. Mean values per quadrat Slide 8: Worked example: Calculating the Diversity index( D) for ground vegetation in a woodland. Mean values per quadrat Slide 9: Worked example: Calculating the Diversity index( D) for ground vegetation in a woodland. Mean values per quadrat Slide 10: The higher the value of D, the greater the diversity. What is Biodiversity? : What is Biodiversity? ‘Biodiversity is the full range of living things on earth and their surroundings and their heritage (genes)’. ‘Everything from genes to ecosystems’ ‘The millions of plants, animals, fungi and microbes that inhabit earth; the genes they contain; and the ecosystems they help build’ Biodiversity is reflected in: : Biodiversity is reflected in: Ecosystem Diversity - community composition and environmental conditions. Species Diversity - species richness (number of species) and relative abundance of each species (species evenness). Genetic Diversity - DNA comparisons. SPECIES RICHNESS : SPECIES RICHNESS How many species on earth? Only 1.5 million have been classified. Best estimate places number of species at 10 million. Birds, mammals and butterflies are mostly named and described by science. Global Distribution of Species Richness : Global Distribution of Species Richness Highest species richness is found in tropical forests. Mammals and butterflies are often used as indicators of species richness. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
Lincoln Index anfield1 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 971 Category: Education License: All Rights Reserved Like it (3) Dislike it (0) Added: October 01, 2008 This Presentation is Public Favorites: 0 Presentation Description Estimating population size of mobile organisms Comments Posting comment... Premium member Presentation Transcript Biological Diversity : 2 factors are considered when measuring diversity: richness - the number of different kinds of species present. evenness – the similarity of the population sizes (relative abundance of species). Biological Diversity Slide 2: Both fields have the same richness (3 species) and the same total number of individuals (1000). However, Field 1 sample has more evenness than Field 2. Field 2 is less diverse than Field 1. Diversity : Diversity A community dominated by 1 or 2 species is less diverse than one in which several different species have a similar abundance. As species richness and evenness increase, so diversity increases. Calculating Diversity : Calculating Diversity The number of individuals of each species is counted e.g. by sampling random quadrats. (There is no need to identify the species, provided they can be distinguished from each other) Diversity index : Diversity index Where: D = diversity index N = total number of organisms of all species n = number of individuals of a particular species Diversity Index : Diversity Index The index is used to quantify the biodiversity of habitats. The diversity index takes into account the number of species present (richness) and the relative abundance of each species (evenness). Slide 7: Worked example: Calculating the Diversity index( D) for ground vegetation in a woodland. Mean values per quadrat Slide 8: Worked example: Calculating the Diversity index( D) for ground vegetation in a woodland. Mean values per quadrat Slide 9: Worked example: Calculating the Diversity index( D) for ground vegetation in a woodland. Mean values per quadrat Slide 10: The higher the value of D, the greater the diversity. What is Biodiversity? : What is Biodiversity? ‘Biodiversity is the full range of living things on earth and their surroundings and their heritage (genes)’. ‘Everything from genes to ecosystems’ ‘The millions of plants, animals, fungi and microbes that inhabit earth; the genes they contain; and the ecosystems they help build’ Biodiversity is reflected in: : Biodiversity is reflected in: Ecosystem Diversity - community composition and environmental conditions. Species Diversity - species richness (number of species) and relative abundance of each species (species evenness). Genetic Diversity - DNA comparisons. SPECIES RICHNESS : SPECIES RICHNESS How many species on earth? Only 1.5 million have been classified. Best estimate places number of species at 10 million. Birds, mammals and butterflies are mostly named and described by science. Global Distribution of Species Richness : Global Distribution of Species Richness Highest species richness is found in tropical forests. Mammals and butterflies are often used as indicators of species richness.