The amount of biological or living diversity per unit area. Sampling is a balance of ease and accuracy. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Learn. There are different meanings of biodiversity, and it can be a measure of the range of habitats, from a small local habitat to the Earth. Estimate the percentage cover of each species – this is the proportion of the area within the quadrat which it occupies. It is calculated by the formula: (g) outline the significance of both high and low values of Simpson’s Index of Diversity. A-level Biology) | Teaching Resources. Topic 2: Cells. absolute population size of a particular species relative to the population sizes of other species within the community, how often a form of a gene appears in a gene pool. Created by. Biodiversity (Edexcel Int. Both of these factors vary greatly, depending on where and when you are looking, therefore biodiversity isn't constant. Simpson’s index of diversity is a measure of the diversity of a habitat. Browse more Topics under Biodiversity And Conservation. STUDY. Practical Skills. (d) describe how random samples can be taken when measuring biodiversity. The habitat tends to be stable and able to withstand changes. This is a PowerPoint presentation for Topic 3 in the Edexcel Biology B A Level course that starts in 2015. You can then multiply up the numbers of individuals of each species found, on order to estimate the number in the whole habitat. Each habitat will be occupied by a range of organisms. One estimate includes: About Us | Contact Us | Privacy Policy | Terms and Conditions | Sitemap, GCSE, IGCSE, A-Level, and IB Biology Resources & Revision for all exam boards, Unit 2: Body Systems, Genetics, Microorganisms and Health, Unit 1: Cells, Living Processes and Biodiversity, Biology 1: Adaptation, Evolution and Body Maintenance, Biology 2: Cells and Metabolism, Digestion and Respiration, Biodiversity, 1. Belt Transect – placing a quadrat against the line, recording its contents, then placing the next quadrat immediately touching the first one, repeating this along the transect. Total number of different species. 4,000 bacteria, 70,000 fungi, 80,000 protocista, 300,000 plants, 130,000 invertebrates and 40,000 vertebrates, 2 million species in the world – 100,000 in the UK. It is basically the variety of species expressed at the genetic level by each individual in a species. A healthy ecosystem has a rich level of biodiversity.The less inhabitable an ecosystem, the less life it can support. Quadrats are square frames used to define the size of the ample area. Revision for AQA Biology AS and A Level Papers, ... Genetics, Biodiversity and Classification. A-level Biology) This lesson describes biodiversity and explains how it can be calculated within a species, a habitat and how it can be compared between habitats. In order to measure the biodiversity of a habitat, you need to observe all the species present. Important environmental benefits, such as clean air to breathe, clean water to drink, and fertile soil in which to grow crops, that ecosystems provide. Sampling involves taking a small portion of the habitat and studying the area carefully. The term habitat refers to the range of physical, biological and environmental factors in which a species can live in. The quadrat is placed randomly and the abundance is measures. The term habitat refers to the range of physical, biological and environmental factors in which a species can live in. Importance of Genetic Biodiversity: Individuals within a species often have very little variation within their DNA, as all members of the same species share DNA. Biodiversity can vary spatially Biodiversity (b) explain how biodiversity may be considered at different levels; habitat, species and genetic. PLAY. MrExham. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Small changes to the environment would only affect one species. Biodiversity, also called biological diversity, the variety of life found in a place on Earth or, often, the total variety of life on Earth. The amount of biological or living diversity per unit area. If the species is only a small part of the habitat, the total number of individual affected is a small proportion of the total number present. Topic 1: Biological Molecules. The detailed PowerPoint and accompanying resources have been designed to cover points 4.16, 4.17 & 4.18 in unit 2 of the Edexcel International A-level Biology specification and the … A-Level Paper 1. Characteristics and Classification of Living Organisms, 20. Spell. Protecting and preserving natural resources and the environment, The preservation of components of biological diversity outside their natural habitats, Protection of species in their natural surroundings. Start studying A-level Biology BIODIVERSITY. A small change to the environment that affects one of those species could damage or destroy the whole habitat. This A-Level Biology section of Revision Science explains biodiversity classification including examples. Biodiversity can also be a measure of species biodiversity, and this can be measured using species richness and evenness. You lower the frame into the quadrat and record any plant touching the needles. Count the number of individuals of each species. To improve the accuracy of the estimation, repeated samples are taken and also the sample size must be large. Such a small change could be a disease or predator, or even something that humans have done nearby. Conservation of Biodiversity; Genetic Diversity. Therefore the effect on the whole habitat is small. Line Transect – recording each organism which is touching the line at suitable, regular intervals. Genetic Biodiversity. Flashcards. Start studying A-level Biology BIODIVERSITY. You could: (f) use Simpson’s Index of Diversity (D) to calculate the biodiversity of a habitat, using the formula. Having a low biodiversity isn’t necessarily an issue. Revision for AQA Biology AS and A Level Papers, including summary notes, worksheets and past exam questions for each topic. There are different meanings of biodiversity, and it can be a measure of the range of habitats, from a small local habitat to the Earth. The range of genetic material present in a gene pool or population of a species. (c) explain the importance of sampling in measuring the biodiversity of a habitat. A point quadrat may be used. (b) explain how biodiversity may be considered at different levels; habitat, species and genetic. For example the range of habitats in the UK include sand dunes, woodlands, meadows, streams and many more. This is a frame holding a number of long needles or pointers. Terms in this set (11) Species richness. Match. It includes the concepts of species diversity, habitat diversity and genetic diversity. Topic 3: Exchange of Substances. This is a free sample, the full PowerPoint presenta… Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. It’s important to choose the right size of the quadrat (normally 50cm or 1m quadrats are used) depending on the size of the area. Test. (h) discuss current estimates of global diversity. Write. The term 'biodiversity' refers to two aspects of organisms in a given environment: 1) The number of species, sometimes called 'species richness' 2) The number of organisms within each species. Menu. For example, a single organism ecosystem was recently discovered deep in a South African gold mine, where only one type of bacteria – Desulforudis audaxviator – is able to survive.
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