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Population Dynamics
Environmental Science Unit 7
28
Environmental Studies
9th Grade
03/28/2020

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Term
commensalism
Definition
is a class of relationships between two organisms where one organism benefits from the other without affecting it.
Term
Habitat
Definition
Consists of food, water, shelter, and space in a suitable arrangement.
Term
Herbivore
Definition
is a form of predation in which an organism consumes principally autotrophs[ such as plants, algae, and photosynthesizing bacteria.
Term
Mutualism
Definition
is the way two organisms of different species exist in a relationship in which each individual benefits from the activity of the other.
Term
Niche
Definition
The role played by an organism in an ecosystem; its food preferences, requirements for shelter, special behaviors, and the timing of its activities (e.g., nocturnal, diurnal), interaction with other organisms and its habitat.
Term
Parasitism
Definition
a non-mutual symbiotic relationship between species, where one species, the parasite, benefits at the expense of the other, the host.
Term
Preditor
Definition
Animals that live by capturing and feeding on other animals
Term
Prey
Definition
Animal hunted or caught for food.
Term
Age structure
Definition
the number or proportion of individuals in each age group.
Term
Age structure diagram
Definition
is a graphical illustration that shows the distribution of various age groups in a population (typically that of a country or region of the world), which forms the shape of a pyramid when the population is growing.
Term
Population
Definition
a study of populations of organisms, especially the regulation of population size
Term
Population density
Definition
measurement of population per unit area or unit volume; it is a quantity of type number density. It is frequently applied to living organisms, and particularly to humans.
Term
Population distribution
Definition
the manner in which the population of a living organism is spatially arranged. (Spread Out or Densely Poplutated)
Term
Population size
Definition
the number of breeding individuals
Term
Sex ratio
Definition
the ratio of males to females in a population
Term
Biotic potential
Definition
the maximum reproductive capacity of a population under the best environmental conditions.
Term
Carrying capacity
Definition
the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment.
Term
Density-dependent factor
Definition
anything limiting the size of a population whose effect is dependent on the number of individuals in the population
Term
Density-independent factor
Definition
anything limiting the size of a population whose effect is not dependent on the number of individuals in the population.
Term
Emigration
Definition
when someone leaves one's native country with the intent to move somewhere else
Term
Exponential growth
Definition
The growth in the value of a quantity, in which the rate of growth is proportional to the instantaneous value of the quantity; for example, when the value has doubled, the rate of increase will also have doubled. The rate may be positive or negative.
Term
Immigration
Definition
the movement of people into a country to which they are not native in order to settle there, especially as permanent residents or future citizens
Term
Migration
Definition
The movement of animals into or out of a population or habitat
Term
Survivorship curve
Definition
is a graph showing the number or proportion of individuals surviving to each age for a given species or group
Term
Invasive species
Definition
a plant or animal that is not native to a specific location (an introduced species); and has a tendency to spread, which is believed to cause damage to the environment, human economy and/or human health
Term
Pioneer species
Definition
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
Term
Primary succession
Definition
one of two types of the biological and ecological succession of plant life, occurring in an environment in which new substrate devoid of vegetation and other organisms usually lacking soil, such as a lava flow or area left from retreated glacier, is deposited. In other words, it is the gradual growth of an ecosystem over a longer period. Secondary succession - is one of the two types of ecological succession of plant life
Term
Succession
Definition
the observed process of change in the species structure of an ecological community over time.
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