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Ecology Quiz #2
Terms in this set (36)
selection of life history traits that are sensitive to population density
species that isn't necessarily abundant in a community yet exerts strong control on the community structure by nature of its ecological role
modification of behavior based on specific experiences
traits that affect an organism's schedule of reproduction and survival
age specific summary of survival patterns of a population
A factor present in an environment that controls a process, particularly growth, abundance or distribution of a population of organisms in an ecosystem
population growth that levels off when a population size approaches carrying capacity
mark and recapture
method to estimate size of population. capture, mark, release. recapture and count number of marked
regular long distance change in location
The death rate; The ratio of the total number of deaths to the total population.
symbiotic relationship where both participants benefit
net primary productivity
gross primary production of an ecosystem minus the energy used by the producers for respiration
process by which nitrogen, either from atmosphere for decomposed organic material, is converted by soil bacteria to compounds assimilated by plants. The incorporated is taken by other organisms and released, acted on by bacteria, and made available again to nonliving environment
the cycle of biological and chemical elements and compounds in specific patterns through substances in an ecosystem; the uptake, use, release, and storage of nutrients by plants and their environments
organism that feeds on cell contents, tissue, or body fluids of another species while in or on the host
An organism, typically a plant, obtaining energy from sunlight as its source of energy to convert inorganic materials into organic materials for use in cellular functions such as biosynthesis and respiration
group pf individuals in the same species that live in the same area that interbreed producing fertile offspring
increase, over a specific period of time, in the number of individuals living in a country or region.
the number of organisms in a population
The change in the environment caused by natural or artificial input of harmful contaminants into the environment, and may cause instability, disruption or harmful effects to the ecosystem.
organism that preys on other organisms
herbivore; organism that eats plants or other autotrophs
A square or rectangular plot of land used to mark off at random a physical area to isolate a sample and determine the percentage of vegetation and animals occurring within the marked area.
rate of increase
speed at which the population of a species increases over time
the ability of an ecosystem to maintain its normal patterns of nutrient cycling and biomass production after being subjected to damage caused by an ecological disturbance.
selection for life history traits that maximize reproductive success in uncrowded environments
An organism (especially a plant or plant-like) that feeds, absorbs or grows on decaying organic matter.
carnivore that eats herbivores
number of relative abundance of species in a biological community
a plot of the number of members of a cohort that are still alive at each age
ecological relationship between organisms of two different species that live together in direct or intimate contact
10 percent rule
when energy is passed in an ecosystem from one trophic level to the next, only ten percent of the energy will be passed on
species that is considered likely to become endangered in the foreseeable future
percentage of production transferred from one trophic level to the next
A position in a food chain or Ecological Pyramid occupied by a group of organisms with similar feeding mode
increasing number of people living in urban areas or cities