Population Ecology Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Term | Definition |
Population | All the individuals of a species that live together in an area |
Demography | The statistical study of populations, allows predictions to be made about how a population will change |
Three Key Features of Populations | 1. Size 2. Density 3. Dispersion |
Size | Number of individuals in an area |
Growth Rate | (birth rate + Immigration) - (death rate + emigration) =Rate of population growth How many individuals are born and move into an area vs how many die and move out of the area |
Density | measure of population per unit area or unit volume |
Population Density | # of individuals / unit of space |
Immigration | movement of individuals into a population |
Emigration | movement of individuals out of a population |
Density- dependent factors | Biotic factors in the environment that have an increasing effect as population size increases (disease, competition, parasites) |
Density- independent factors | Aboiotic factors in the environment that affect populations regardless of their density (temperature, weather) A cold snowy winter can decrease birth rates and increase death rates in the spring for deer |
Dispersion: spacing of organisms | Clumped (aggregated), Uniform, Random |
Population density | Number of individuals in a given area or volume; count all individuals in a population, estimate by sampling, mark-recapture method |
Idealizing models describe two kinds of population growth | 1. Exponential Growth 2. Logistic Growth |
Exponential Growth | A pattern of slow then rapid growth of a population. Growth curve resembles a J. |
Logistic Growth | A pattern of slow then rapid growth finish in a stable population at carrying capacity growth curve resembles an S. |
Carrying Capacity (K) | -The maximum population size that can be supported by the available resources. -There can only be as many organisms as the environmental resources can support |
Declining birth rate or increasing death rate are caused by | -Limited food supply -The buildup toxic wastes -Increased disease -Predation |
R Strategists | -Short life span -Small body size -Reproduce quickly -Have many young -Little parental care |
K Strategists | -Longest life span -Large body size -Reproduce slowly -Have few young -Provides parental care |
Age Distribution | -Distribution of males and females in each age group of population -Used to predict future population growth |
Species diversity | The more species and number of that species that occupy a habitat the more diverse the community is |
Ecological diversity | The more diverse an ecosystem is the more stable it is and the more it has to offer in resources |
Genetic diversity | The more diverse the genetics of a species the less likely it is to collapse in the face of hardship |
Habitat loss | -The single most common cause of species extinction -Reduces biodiversity |
Reasons for habitat loss | -Farming -Logging -Urbanization |
Ecological service | -Bees pollinate flowers -Roots hold soil -Predators prevent overgrazing |
Economic benefit | -Honey, fruit and other crops are valuable and depend on diversity of pollinators -Plants can be used for medical needs |
Human population growth | - J curves growth -Rate: 1.3% yearly -Growing rate is 80 million yearly |
Mutualism | Both species benefit |
Parasitism | One organisms benefits at the expense of another |
Commensalism | One species benefits while the other is not affected |
Climax community | A community goes through succession, then when it is stable at the very end it is the climax |
Climate change | The recent rise in earths surface temperatures |
Created by:
kieren1
Popular Biology sets