Terms : Hide Images
| 5229085497 | Population | A group of individuals that belong to the same species and live in the same area | 0 | |
| 5229085498 | Community | A group of interdependent organisms inhabiting the same region and interacting with each other | 1 | |
| 5229085499 | Population growth | The change in number of individuals within a population | 2 | |
| 5229085500 | Equilibrium | A state of balance among the components of a system | 3 | |
| 5229085501 | Population growth rate | The change in population numbers divided by the time over which that change occurs. | 4 | |
| 5229085502 | Exponential increase | The growth produced when a base population increases by a given percentage (as opposed to a given amount) each year. An exponential increase is characterized by doubling again and again, each doubling occurring in the same period of time. It produces a J-shaped curve. | 5 | |
| 5229085503 | Population explosion | The exponential increase observed to occur in a population when conditions are such that a large percentage of the offspring are able to survive and reproduce in turn. A population explosion frequently leads to over exploitation and eventual collapse of the ecosystem. | 6 | |
| 5229085505 | J-curve | The shape of a population growth graph when the population is growing exponentially. |  | 7 |
| 5229085506 | carrying capacity (K) | Largest number of individuals of a particular species that a particular environment can support | 8 | |
| 5229085507 | Logistic growth | A pattern of growth of a population that results in an S-shaped curve plotted over time, such that the population levels off at the carrying capacity (K). | 9 | |
| 5229085508 | S-curve | The shape of a population growth graph when the population growth slows and approaches carrying capacity. |  | 10 |
| 5229085509 | Biotic potential | The maximum rate at which a population could increase under ideal conditions | 11 | |
| 5229085510 | Recruitment | The maturation and successful entry of young into an adult breeding population. | 12 | |
| 5229085511 | Environmental resistance | All the limiting factors that tend to reduce population growth rates and set the maximum allowable population size or carrying capacity of an ecosystem | 13 | |
| 5229085513 | Reproductive strategies | A life history property of a species that involves a balance between reproduction and death. | 14 | |
| 5229085514 | r-strategists | A reproductive strategy of a species that involves producing large numbers of young (a high reproductive rate) and survival of smaller numbers over time. Also called opportunistic species. | 15 | |
| 5229085515 | K-strategists | A reproductive strategy for a species whereby there is a low reproductive rate but good survival of young due to care and protection by adults. Also called equilibrium species. | 16 | |
| 5229085517 | Population density | Number of individuals per unit area | 17 | |
| 5229085518 | Density-dependent factor | Factor that limits a population more as population density increases. Includes competition, predation, and disease | 18 | |
| 5229085519 | Density-independent factor | Factors that limit populations but are unrelated to population density. Includes catastrophic events and natural disaters | 19 | |
| 5229085532 | Parasites | An organism that lives in or on another organism, deriving nourishment at the expense of its host, usually without killing it | 20 | |
| 5229085534 | Pathogens | Microbes that cause disease | 21 | |
| 5229085536 | Territory | An area that is occupied and defended by an animal or group of animals. | 22 | |
| 5229085537 | Fitness | Ability of an organism to survive and reproduce in its environment. | 23 | |
| 5229085538 | Natural selection | A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits. | 24 | |
| 5229085541 | Selective pressures | Forces in the environment that influence reproductive success in individuals | 25 | |
| 5229085543 | Biological evolution | Non-random changes in genotype or allele frequencies across generations | 26 | |
| 5229085545 | Reproductive isolation | Separation of species or populations so that they cannot interbreed and produce fertile offspring | 27 | |
| 5229085546 | Plate tectonics | The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle. | 28 | |
| 5229085547 | Tectonic plates | An irregular section of the lithosphere that floats on the earth's mantle | 29 | |
| 5229085548 | tsunami | A long high sea wave usually caused by an earthquake. | 30 | |
| 5229355724 | Ecology | the study of how organisms interact with one another and with their environments | 31 | |
| 5229355734 | Population size | the number of individual organisms present in a population at a given time | 32 | |
| 5229355735 | Population density | the number of individuals in a population per unit of area | 33 | |
| 5229355736 | Population distribution | how organisms are arranged in an area; sometimes called population dispersion | 34 | |
| 5229355737 | Population equilibrium | A state of balance between births and deaths in a population | 35 | |
| 5229355738 | Population explosion | The exponential increase observed to occur in a population when conditions are such that a large percentage of the offspring are able to survive and reproduce in turn. A population explosion frequently leads to over exploitation and eventual collapse of the ecosystem. | 36 | |
| 5229355739 | Sex ratio | the proportion of males to females in a population | 37 | |
| 5229355740 | Survivorship curve | a graph showing the likelihood of survival within a group or population by age | 38 | |
| 5229355741 | Immigration | the movement of individuals to a given area | 39 | |
| 5229355742 | Emigration | the movement of individuals away from a given area | 40 | |
| 5229355743 | Migration | the seasonal movement of organisms into and out of an area | 41 | |
| 5229355744 | Exponential growth | the pattern of population growth in which a population increases by a fixed percentage each year | 42 | |
| 5229355745 | Limiting factor | a characteristic of the environment that restricts population growth | 43 | |
| 5229355746 | Carrying capacity | the largest population a given environment can support | 44 | |
| 5229355747 | Logistic growth | the pattern of population growth in which exponential growth is slowed and finally stopped by limiting factors | 45 | |
| 5229355751 | Symbiosis | The intimate living together or association of two kinds of organisms | 46 | |
| 5229355752 | Mutualism | A close relationship between two organisms from which both derive a benefit | 47 | |
| 5229355753 | Commensalism | A relation between two species in which one is benefited and the other is not affected | 48 | |
| 5229355754 | Amensalism | An interaction between species whereby one species is harmed, while the other is unaffected. | 49 | |
| 5229355755 | Parasitism | A relation between two species in which one is benefited and the other is harmed | 50 | |
| 5229355758 | Keystone species | A species whose role is essential for the survival of many other species in an ecosystem. | 51 | |
| 5229355759 | INTERspecific competition | Competition for resources between members of two or more species | 52 | |
| 5229355760 | INTRAspecific competition | Competition for resources between members of the same species | 53 | |
| 5229355762 | Predator | An animal that feeds on another living organism, either plant or animal | 54 | |
| 5229355763 | Prey | An organism that is fed on by a predator | 55 | |
| 5229355764 | Carnivore | An animal that feeds more or less on exclusively on other animals | 56 | |
| 5229355765 | Herbivore | An organism such as a rabbit or a deer that feeds primarily on green plants or plant products such as seeds or nuts. (Synonym: primary consumer.) | 57 | |
| 5229355766 | Host | In feeding relationships, particularly parasitism, refers to the organism that is being fed upon or affected by the parasite. | 58 | |
| 5229355767 | Reproductive Isolation | One of the processes of speciation, involving anything that keeps individuals or subpopulations from interbreeding. | 59 | |
| 5229355768 | Critical number | The minimum number of organisms necessary for a species to survive | 60 | |
| 5229355769 | Threatened | A species that could become endangered in the near future | 61 | |
| 5229355770 | Endangered | A species whose numbers are so small that the species is at risk of extinction | 62 | |
| 5229355771 | Predation | An interaction in which one organism captures and feeds on another organism | 63 | |
| 5229355772 | Dynamic Equilibrium | A state of balance between continuing processes. | 64 |
