Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
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
Chapter 6 APES
| Term | Definition |
|---|---|
| Population | The individuals that belong to the same species and live in a species and live in a given area at a particular time. |
| Community | All of the population of organisms. |
| Population Ecology | The study of factors that cause populations to increase or decrease. |
| Population Size (N) | The total number of individuals within a defined area at a given time. |
| Population density | The number of individuals per unit area at a given time. |
| Population distribution | A description of how individuals are distributed with respect to one another. |
| Sex ratio | The ratio of males to females in a population. |
| Age Structure | A description of how many individuals fit into a particular age categories in a population. |
| Limiting Resource | A resource that a population cannot live without and that occurs in quantities lower than the population would require to increase in size. |
| Density-dependent factor | A factor that influences an individual's probability of survival and reproduction in a manner that depends on the size of the population. |
| Density-independent factor | A factor that has the same effect on an individuals probability of survival and the amount of reproduction at any population size. |
| Carrying capacity (K) | The total capacity for a population to be sustained. |
| Population growth models | Mathematical equations that can be used to predict population size at any moment in time. |
| Population growth rate | The number of offspring an individual can produce in a given time period, minus the deaths of the individual or its offspring during the same period. |
| Intrinsic growth rate (r) | The max. potential for growth of a population under ideal conditions with unlimited resources. |
| Exponential growth model | A growth model that estimates a population's future size after a period of time based on the intrinsic growth rate and the number of reproducing individuals currently in the population. |
| J-Curve | The curve of the exponential growth model when graphed. |
| Logistic growth model | A growth model that describes a population whose growth in initially exponential, but slows as the population approaches the carrying capacity of the environment. |
| S-Curve | The shape of the logistic growth model when graphed. |
| Overshoot & Die-off | When a population becomes larger than the environment's carrying capacity. |
| K-selected species | A species with a low intrinsic growth rate that causes the population to increase slowly until it reaches carrying capacity. |
| r-selected species | A species that has a high intrinsic growth rate, which often leads to population overshoots and die-offs. |
| Survivor-ship curves (I, II, III) | A graph that represents the distinct patterns of species survival as a function of age. |
| Metapopulation | A group of spatially distinct populations that are connected by occasional movements of individuals between them. |
| shifting agriculture | an agricultural method in which land is cleared and used for a few years until the soil is depleted of nutrients. |
| desertification | the transformation of arable, productive land to desert or unproductive land due to climate change or destructive land use |
| nomadic grazing | the feeding of herds of animals by moving them to seasonally productive feeding grounds, often over long distances |
| sustainable agriculture | agriculture that fulfills the need for food and fiber while enhancing the quality of the soil, minimizing the use of nonrenewable resources, and allowing economic viability for the farmer |
| intercropping | an agricultural method in which two or more crop species are planted in the same field at the same time to promote a synergistic interaction |
| crop rotation | an agricultural technique in which crop species in a field are rotated from season to season |
| agroforestry | an agricultural technique in which trees and vegetables are intercropped |
| contour plowing | an agricultural technique in which plowing and harvesting are done parallel to the topographic contours of the land |
| perennial vs annual plant | perennial plant: a plant that lives for multiple years annual plant: a plant that lives only one season |
| no-till agriculture | an agricultural method in which farmers do not turn the soil between seasons as a means of reducing topsoil erosion |
| Integrated Pest Management (IPM) | an agricultural practice that uses a variety of techniques designed to minimize pesticide inputs |
| organic agriculture | production of crops without the use of synthetic pesticides or fertilizers |
| Individual Transfer Quota (ITQ) | a fishery management program in which individual fishers are given total allowable catch of fish in a season that they can either catch or sell |
| aquaculture | farming aquatic organisms such as fish, shellfish, and seaweeds |
Created by:
fbenitez155