17 Ecology

17 Ecology - ECOLOGY TFTD: Ecology Ecology. Noun....

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ECOLOGY
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TFTD: Ecology Ecology. Noun . Etymology, Greek οικοσ (oikos) = dwelling, plus λογ οσ (logos) = discourse. 1: The study of relationships of organisms with each other and with their environment (it’s not just about recycling!)
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Definitions Population An interbreeding group of individuals of the same species, usually found in a discrete area
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Populations A population is isolated in space and/or time from other populations of the same species The delineation of a population is subjective, but important to define in terms of ecological research & pest management
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Population Characteristics Density : The number of individuals per unit of area or volume Distribution : The spatial arrangement of the individuals in a population
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Population Distribution Types of distributions seen in nature: - random - aggregated (clumped) - regular (uniform)
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Population Birth/Death Rates Birth rate (natality): The total number of eggs or the eggs per female laid per unit time = numbers added to a population Death rate (mortality): The death rate, or numbers dying per unit time = numbers removed from a population
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Population Age Structure Age structure (age distribution): The proportion of individuals in different age groups at a given time This is easy to conceptualize with insects as they have discrete stages (eggs, nymphs, larvae, pupae, adults)
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17 Ecology - ECOLOGY TFTD: Ecology Ecology. Noun....

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