Terms : Hide Images
| 6728980140 | Population | a localized group of individuals of the same species that can interbreed, producing fertile offspring |  | 0 |
| 6728980141 | Community | all the organisms that inhabit a particular area; as assemblage of populations of different species living close enough together for potential interaction |  | 1 |
| 6728980142 | Ecosystem | all the organisms in a given area as well as the abiotic factors with which they interact |  | 2 |
| 6728980143 | Biotic | pertaining to the living organisms in the environment |  | 3 |
| 6728980144 | Abiotic | nonliving; referring to physical and chemical properties of an environment |  | 4 |
| 6728980145 | Biosphere | the entire portion of earth inhabited by life; the sum of all the planet's ecosystems |  | 5 |
| 6728980146 | Niche | the sum of a species' use of the biotic and abiotic resources in its environment | 6 | |
| 6728980147 | Clumped Distribution | individual aggregated patches, some organisms group together where food is abundant |  | 7 |
| 6728980148 | Uniform Distribution | evenly spaced, some organisms maintain evenly distributed spacing to avoid aggressive interactions between neighbors |  | 8 |
| 6728980149 | Random Distribution | unpredictable spacing, some plants grow in random groups if their seeds were windblown across an area |  | 9 |
| 6728980150 | Population Ecology | the study of populations in relation to their environment, including environmental influences on populations, on population density and distribution, age structure, and variations in population size | 10 | |
| 6728980151 | Birth Rate | rate of annual birth within a population | 11 | |
| 6728980152 | Death Rate | rate of annual death within a population | 12 | |
| 6728980153 | Sex Ratio | ratio of females to males within a population | 13 | |
| 6728980154 | Age Structure | the relative number of individuals of each age in a population | 14 | |
| 6728980155 | Immigration Rate | the rate of influx of new individuals INTO a population from other areas | 15 | |
| 6728980156 | Emigration Rate | the rate of movement of individuals OUT of a population | 16 | |
| 6728980157 | Carrying Capacity | the maximum population size that can be supported by the available resources, (symbolized by K) |  | 17 |
| 6728980158 | Density Dependent | any characteristic that varies according to an increase in population density | 18 | |
| 6728980159 | Exponential Growth | growth of a population in an ideal, unlimited environment, (represented by a J-Shaped curve when population size is plotted over time) |  | 19 |
| 6728980160 | Logistical Growth | population growth that levels off as population size approaches carrying capacity | 20 | |
| 6728980161 | K-Selected | stabilize around carrying capacity, have fewer offspring later in life, mature later, live longer and invest more parental care | 21 | |
| 6728980162 | R-Selected | reside in unstable environment, have many offspring early in life, mature earlier, shorter life span, no parental care | 22 | |
| 6728980163 | Survivorship Curve | the plot of the proportion or numbers in a cohort still alive at each age | 23 | |
| 6728980164 | Type I Surivorship Curve | low death rates during early/middle life then increase among older age groups (humans) | 24 | |
| 6728980165 | Type II Surviorship Curve | constant death rate over the organism's life span | 25 | |
| 6728980166 | Type III Surviorship Curve | very high death rates for the young and then declines for those few individuals that survive the early period (insects) | 26 | |
| 6728980167 | Symbiosis | an ecological relationship between organisms of two different species that live together in direct and intimate contact | 27 | |
| 6728980168 | Commensalism | a symbiotic relationship in which one organism benefits but the other is neither helped nor harmed | 28 | |
| 6728980169 | Mutualism | a symbiotic relationship in which both participants benefit | 29 | |
| 6728980170 | Parasitism | a symbiotic relationship in which one organism (the parasite) benefits at the expense of another (the host) by living either within or on its host | 30 | |
| 6728980171 | Intraspecific Competition | interactions between the same species competing for resources | 31 | |
| 6728980172 | Interspecific Competition | competition for resources between individuals of two or more species when resources are in short supply | 32 | |
| 6728980173 | Predation | an interaction between species in which one species (the predator) eats the other (the prey) | 33 | |
| 6728980174 | Aposematic Coloration | the bright coloration of animals with effective physical or chemical defenses that acts as a warning to predators | 34 | |
| 6728980175 | Batesian Mimicry | a type of mimicry in which a harmless species look like a species that is poisonous or harmful to predators | 35 | |
| 6728980176 | Cryptic Coloration | camouflage that makes a potential prey difficult to spot against its background | 36 | |
| 6728980177 | Mullerian Mimicry | a mutual mimicry by two unpalatable species | 37 | |
| 6728980178 | Pioneer Species | the first species to colonize previously disrupted or damaged ecosystems, beginning a chain of ecological succession that ultimately leads to a more biodiverse steady-state ecosystem | 38 | |
| 6728980179 | Climax Community | in a community of organisms in a specific area there is one state of equilibrium controlled solely by climate | 39 | |
| 6728980180 | Succession | the process by which the structure of a biological community evolves over time | 40 | |
| 6728980181 | Primary Succession | a type of ecological succession that occurs in an area where there were originally no organisms present and where soil has not yet formed | 41 | |
| 6728980182 | Secondary Succession | a type of succession that occurs where an existing community has been cleared by some disturbance that leaves the soil or substance intact | 42 | |
| 6728980183 | Photoautotrophs | an organism that harnesses light energy to drive the synthesis of organic compounds from Carbon Dioxide (CO2) | 43 | |
| 6728980184 | Chemoautotrophs | an organism that needs only CO2 as a carbon source but obtains energy by oxidizing inorganic substances | 44 | |
| 6728980185 | Herbivore | an animal that eats mainly plants or algae | 45 | |
| 6728980186 | Carnivore | an animal that mainly eats other animals | 46 | |
| 6728980187 | Detritivore | a consumer that derives its energy and nutrients from nonliving organic material such as corpses, fallen plant material, and the wastes of living organism (a decomposer) | 47 | |
| 6728980188 | Food Chain | the pathway along which food energy is transferred from trophic level to trophic level, beginning with producers | 48 | |
| 6728980189 | Food Web | the interconnected feeding relationships in an ecosystem | 49 | |
| 6728980190 | Trophic Levels | the positions organisms occupy in a food chain |  | 50 |
| 6728980191 | Secondary Consumer | a carnivore that eats herbivores | 51 | |
| 6728980192 | Primary Consumer | a herbivore; an organism that eats plants or other autotrophs | 52 | |
| 6728980193 | Biogeochemical Cycles | any of the various chemical cycles, which involve both biotic and abiotic components of ecosystems | 53 | |
| 6728980194 | Carbon Cycle | forming the framework of organic molecules, photosynthesis & cellular respiration circulate this nutrient | 54 | |
| 6728980195 | Phosphorus Cycle | cycling of this nutrient through geologic processes such as erosion and sedimentation | 55 | |
| 6728980196 | Nitrogen Cycle | this nutrient is converted to compounds that can be assimilated by plants then returned in gas form to the atmosphere; all processes rely on bacteria | 56 | |
| 6728980197 | Nitrogen Fixation | the conversion of atmospheric nitrogen to ammonia | 57 | |
| 6728980198 | Denitrification | process where bacteria use nitrates in their metabolism instead of oxygen releasing nitrogen gas then into the atmosphere | 58 | |
| 6728980199 | Water Cycle | this nutrient cycle involves evaporation from the earth & transpiration from plants and falls then by precipitation back down to the earth to begin the cycle again | 59 | |
| 6728980200 | Age Structure Diagrams | a visual representation of the relative number of individuals of each age in a population | 60 | |
| 6728980201 | Competitive Exclusion Principle | the concept that when populations of two similar species compete for the same limited resources, one population will use the resources more efficiently and have a reproductive advantage that will eventually lead to the elimination of the other population | 61 | |
| 6728980202 | Resource Partitioning | the division of environmental resources by coexisting species such that the niche of each species differs by one or more significant factors from the niches of all the coexisting species | 62 | |
| 6728980203 | Zero Population Growth (ZPG) | a period of stability in population size, when the per capita birth rate and death rate are equal | 63 | |
| 6728980204 | Gross Primary Productivity (GPP) | the total primary production of an ecosystem | 64 | |
| 6728980205 | Net Primary Productivity (NPP) | the gross primary production of an ecosystem minus the energy used by the producers for respiration | 65 | |
| 6728980206 | Keystone Species | a species that is not necessarily abundant in a community yet experts strong control on community structure by the nature of its ecological role or niche | 66 | |
| 6728980207 | Bottom-up Model | a model of community organization in which mineral nutrients influence community organization by controlling plant or phytoplankton numbers, which in turn control herbivores, which in turn control predator numbers | 67 | |
| 6728980208 | Top-down Model | a model of community organization in which predation influences community organization by controlling herbivore numbers, which in turn control plant or phytoplankton numbers, which in turn control nutrient levels; also called the trophic cascade model | 68 | |
| 6728980209 | Biological Magnification | a process in which retained substances become more concentrated at each high trophic level in a food chain | 69 | |
| 6728980210 | Decomposers | organisms that absorb nutrients from nonliving organic material such as corpses, fallen plant material, the wastes of living organisms and converts them into inorganic forms; a detritivore | 70 | |
| 6728980211 | Eutrophication | a process by which nutrients, particularly phosphorus and nitrogen, become highly concentrated in a body of water, leading to increased growth of organisms such as algae or cyanobacteria | 71 | |
| 6728980212 | Fundamental Niche | the niche potentially occupied by that species | 72 | |
| 6728980213 | Realized Niche | the portion of the fundamental niche that a species actually occupies in the environment | 73 | |
| 6728980214 | Invasive Species | a species often introduced by humans, that takes hold outside its native range | 74 | |
| 6728980215 | Altruism | behavior that increases fitness of another individual but decreases their own fitness | 75 | |
| 6728980216 | Kin selection | enhancing the reproductive success of one's relatives | 76 | |
| 6728980217 | Nitrification | ammonia is converted to nitrates and nitrites | 77 | |
| 6728980218 | Ammonification | decomposers convert organic nitrogen to ammonia | 78 | |
| 6728980219 | Classical conditioning | association between neutral stimulus and natural response (ex: dogs salivating to sound of bell ringing) | 79 | |
| 6728980220 | Operant conditioning | trial and error learning; making associations between behavior and a reward or punishment | 80 | |
| 6728980221 | Communication | tactile, visual, auditory and chemical means of relaying messages to other members of ones species | 81 | |
| 6728980222 | Taxis | directed movement towards or away from a stimulus | 82 | |
| 6728980223 | Kinesis | movement in response to a stimulus that is not directional | 83 | |
| 6728980224 | Fixed Action Pattern | a sequence of unlearned actions that are unchangable and often carried to completion | 84 | |
| 6728980225 | Density dependent factor | factor that affects population based on size (disease, predation etc) | 85 | |
| 6728980226 | Density independent factor | factor that affect population regardless of size (weather, humans etc) | 86 | |
| 6728980227 | Species diversity | variety of organisms in a community | 87 | |
| 6728980228 | Species richness | the number of different species in a community | 88 | |
| 6728980229 | Relative abundance | evenness of distribution of individuals among species in a community | 89 |
