BIO 104 - Population Biology
BIO 104 - Population Biology BIO 104
Popular in Biology for the 21st Century
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This 3 page Class Notes was uploaded by Olivia Orlando on Friday November 27, 2015. The Class Notes belongs to BIO 104 at Grand Valley State University taught by in Fall 2015. Since its upload, it has received 9 views. For similar materials see Biology for the 21st Century in Biology at Grand Valley State University.
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Date Created: 11/27/15
Biology 104 Population Biology Chapter 21 Population Biology Lecture Book Populations members of the same species living together Communities different species living together Ecosystems communities all those species living together plus the nonliving environment Earth relatively closed system to everything except energy limited resources V If 1 lm I y Energy Heat or light Reproductive success is a key to populations key goal of nature to reproduce guarantees the success of the future generation Carrying Capacity has to deal with limited resources how many resources do you have to sustain a population Inbreeding close relatives mating because they don t have a choice very small population or due to genetic drift low genetic diversity Organisms interacting reasons 1 Food predator prey herbivory 2 Abiotic resources water climate issues is the study of the interactions between organisms and between organisms and their nonliving environment is a group of organisms of the same species living and interacting in a particular area A are interacting populations of different species in a defined habitat An ecosystem is all the living organisms in an area and the nonliving components of the environment with which they interact Three Population Patterns 1 individuals are equally likely to be anywhere within the area 2 high density clumps separated by areas of low abundance 3 individuals maximize space between them by being uniformly spaced is the way that organisms are distributed in geographic space which depends on resources and interactions with other members of the population is the difference between the birth rate and the death rate of a given population also known as the rate of natural increase higher birthrate less death rate population grows is the movement of individuals into a population is the movement of individuals out of a population Two general types of population growth 1 the unrestricted growth of a population increasing at a constant growth rate 2 a pattern of growth that starts off fast and then levels off as the population reaches the carrying capacity of the environment is the physical environment where an organism lives and to which it is adapted is the maximum population size that a given environment or habitat can support given its food supply places an upper limit on the size of any population no natural population can grow exponentially forever without eventually reaching a point at which resource scarcity and other factors limit population growth is the number of organisms per unit area is a factor whose in uence on population size and growth depends on the number and crowding of individuals in the population example predation refers to the living components of an environment predators food disease is a factor that can in uence population size and growth regardless of the numbers and crowding within a population Example if the weather is extremely cold it can kill the members of a species that are not fit to survive in artic conditions refers to the nonliving components of an environment precipitation fire temperature Populations in a community are interconnected the fate of one often in uencing the fate of the others References Works Cited Shuster Michele Janet Vigna Matthew Tontonoz and Gunjan SinhaBiology for a Changing World with Physiology New York City WH Freeman 2014 Print
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