Term
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Definition
| % growth / N (the # of years) |
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Term
| Mark and recapture calculations |
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Definition
| (total marked x total # captured) / total # marked and recaptured |
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Term
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Definition
| 1 member gains benefits at the expense of the host |
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Term
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Definition
| 1 of the partners is inhibited while the other is not affacted |
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Term
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Definition
| 1 organism benefits while the other is neither helped or hurt |
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Term
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Definition
| A concept used on how much land is necessary to support each person in terms of energy, foot, etc. |
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Term
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Definition
| A group of living organisms consisting of similar individuals capable of breeding |
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Term
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Definition
| A measurement of population per unit area or unit volume. |
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Term
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Definition
| A relationship between 2 species where both benefit |
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Term
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Definition
| A sample technique is used for study of the populations of mobile organisms, estimating population size from the # of marked individuals in samples. |
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Term
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Definition
| A shift from 0 population growth in which birth rates are high to 0 population growth characterized instead by low birth rate and death rates |
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Term
| Stage 4 (demographic transition) |
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Definition
| Birth and death rate slow. Population is steady but higher than stage 1. |
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Term
| Stage 2 (demographic transition) |
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Definition
| Birth rate is high, death rate is falling, population is growing rapidly but growth is not due to increased fertility |
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Term
| Logistic growth assumptions |
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Definition
| Carrying capacity is never exceeded, carrying capacity remains constant, population is assumed closed. |
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Term
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Definition
| Collection of all the organisms that live together in a particular area, living or non living |
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Term
| Stage 3 (demographic transition) |
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Definition
| Death rate continues to fall, birth rate starts to fall, population growth slows |
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Term
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Definition
| Distribution pattern that shows spatial relationship between members of a population within a habitat. Distributed in 3 patterns: uniform, random, or clumped |
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Term
| Uniform (dispersion type) |
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Definition
| Found very evenly throughout their habitat, usually invasive species |
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Term
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Definition
| Individuals compete for a limited resource like food, the larger the population the more competition. |
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Term
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Definition
| Individuals of 2 or more species live in direct contact with eachother |
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Term
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Definition
| Models determine age structure of population and is described in 4 stages. |
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Term
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Definition
| Occurs where there are unlimited resources and no competition so the population skyrockets |
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Term
| Exponential growth examples |
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Definition
| Organisms invading a new environment or an initial bacteria growth |
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Term
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Definition
| Plot of the # of individuals still alive at each age in the max. life span |
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Term
| Clumped (dispersion type) |
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Definition
| Populations found in tight clusters yet in-between these clusters few to no individuals are found. |
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Term
| Examples of logistic growth |
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Definition
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Term
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Definition
| Starts as exponential, but growth slows as resources become limited until carrying capacity is reached |
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Term
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Definition
| The consumption of living plant tissue by animals |
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Term
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Definition
| The max. population size that can be sustained for a long time in an environment (k) |
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Term
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Definition
| The strength of the effect depends on the density of the population usually have a greater effect the larger the population. Ex. food, habitat area |
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Term
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Definition
| The strength of the effect doe snot depend on population density. ex. weather, climate, floods |
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Term
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Definition
| The study of the interactions of organisms and their environment |
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Term
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Definition
| Usually mobile/immobile species that can live anywhere in a given habitat so they are randomly scattered across the ecosystem |
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Term
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Definition
| an interaction between species in which 1 species uses another as food |
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Term
| Stage 1 (demographic transition) |
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Definition
| birth and death rates are very high. Population is slow and fluctuates |
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Term
| Exponential Growth Equation |
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Definition
dN/dt=rN
or
the change in population as time changes = the growth rate times the population |
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Term
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Definition
| groups of individuals that belong to the same species and live in the same area |
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Term
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Definition
| number, rate, or capacity of offspring production |
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Term
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Definition
| r-selected, k-selected and the mixture of both is deemed life history strategies |
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Term
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Definition
| the concept that in certain (k-selected) populations, life history is centered around producing relatively few offspring that have a good chance of survival |
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Term
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Definition
| the concept that in certain (r-selected) populations, a high reproduction rate is the chief determined of life history |
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Term
| Exponential growth assumptions |
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Definition
| unlimited resources, continuous reproduction, unchanging environment. |
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