Lecture 12hv - Lecture 12 Community Structure And...

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Lecture 12 Community Structure And Biodiversity
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Learning Objectives To acquire the definition and characteristics which define communities. To describe the various forms of species interactions. To gain knowledge of the forces behind community stability and instability. To describe the patterns of biodiversity.
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Learning Outcomes At the end of this lecture students will be able to: Define community and its characteristics which influence the community’s structure. Describe the forms of species interaction; mutualism, competition, predation and parasitism Describe the factors that lead to community stability of effect it. Describe the global patterns of biodiversity
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Definitions…. HABITAT : type of place where individuals of a species usually live have physical and chemical features such as temperature. COMMUNITY an association of all the populations of species that occupy the same habitat.
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5 factors that shape the structure of a community: 1. Interactions between climate and topography. ( determine the temperature, rainfall, type of soil and other conditions) 1. Availability of food & resources throughout the year. 1. 4. Interactions between various kinds of among species?? ( mutualism, competition and predation ) 5. Overall pattern of population sizes (Physical disturbance, immigration and extinction)
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These five factors… Determine the number of species at several feeding levels???? Influence population size.
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Niche Sum of all activities & relationships in which its individual engage to secure & use the resources required for their survival and reproduction. Every species in the community has its own NICHE.
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Forms of Species Interactions Is either direct or indirect association between each other. There are several types of interaction: Commensalism Mutualism Interspecific Competition Predation & Parasitism
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Types of interactions COMMENSALISM helps on species but does not effect the other much (birds nesting on the tree) MUTUALISM benefit the interacting species through exploitation. INTERSPECIFIC COMPETITION disadvantages flow both ways between species. benefit only 1species the predator/parasite; detrimental effects on host/prey.
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Close association between two or more species during part or all of the life cycle. Commensalisms, mutualism, predation and
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Lecture 12hv - Lecture 12 Community Structure And...

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