Biology Lecture Test #2

Biology Lecture Test #2 - Territoriality defense of an area...

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Territoriality- defense of an area where important resources are located. (Ex. fire ants, birds) Mates, food and nesting sites may be defended in territories. Social Behavior Some animals live solitary lives and only congregate with others of the same species during breeding season. Others live in herds or flocks. Some animals exhibit eusocial behavior Several species of insects form complex societies. Ex. termites, ants, bees, and wasps. This is known as eusociality. It is characterized by: 1. several adults living together in groups 2. overlapping generations, parents and offspring living together in the same colony. 3. cooperation in next building and brood care 4. reproductive dominance, including the presence of sterile castes The complex organization of insect societies is dominated by one or a few egg-laying females, which are referred to as queens. This overlapping of generations, which is not common among insects, and extensive parental care are necessary for eusociality. In bee societies, an individual will become a sterile worker or fertile reproductive depending on the type of food it receives as a developing larva. The development of sexual forms can be inhibited by substances produced by the queen and few to the larvae. Ch. 26 Population Growth and Regulation Ecology is the study of interrelationships between living things and their environment. The environment is the abiotic part (nonliving, soil, water, weather) and the biotic part, which includes all the living things. An ecosystem is all of the nonliving things and organisms within a defined area of an environment. Within an ecosystem are populations of different organisms that make up a community.
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A population is all of the members of a species of organism that interbreed within a certain geographical area. Births, deaths, and migrations can alter population size. Immigration- organisms join a population. Emigration- organisms leave a population. Populations grow when the number of births and immigrations exceeds the number of deaths and emigrations. Biotic potential is the maximum rate at which a population could increase if conditions were ideal. Limits to biotic potential include available food, space, predation, parasitism, competition, natural disasters. The growth rate (r) of a population is a measure of the change in population size per unit of time: Birth rate (b) – death rate (D) = growth rate (r) Ch. 27 Community Interactions A community includes all of the interacting populations within an ecosystem. A community’s interacting web of life tends to maintain a balance between the resources and the numbers of the individuals consuming them.
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This note was uploaded on 06/11/2008 for the course BIOL 11031 taught by Professor Brickman during the Spring '08 term at UGA.

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Biology Lecture Test #2 - Territoriality defense of an area...

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