Populations And Communities Flashcards
What is a population?
Group of individuals of the same species living in a shared place at a specific point in time.
What do populations beneifit from?
Same ressources.
What does studying a population do?
Gives an insight on how species evolve and if they’re thriving or declining.
What is population size?
Represents the number of people it comtains.
How can the population size decrease or increase?
Death, birth, immigration, emmigration.
What are the methods of counting?
Sample area, mark-recapture.
What is population density?
The number of individuals per unit of area or volume.
What does the population density depend on?
Water, food, climate, parasites, disease, natrual and human disasters.
What is population distribuation?
The way in which indiciduals are distributed within their habitat.
What are the patterns?
Clumped, Uniform and random
What is clumped, uniform and random?
Clumped: Specices found in groups.
Uniform: Species found in equally spaced sections.
Random: Species found with no predictable pattern.
What is an ecological factor?
Aspects pf a habitat that can affect the organisms living there.
What is Abiotic? ( non-living )
A physical or chemical aspect of the environment.
What is Biotic? ( living )
An action of the living organism in a habitat.
Examples of abiotic?
Temperature, soil, precipitation, amount of light, depth, terrain, natural disasters.
Examples of biotic?
Predation, amount of food, human interference, birth/death rate, disease, competition.
What is the limiting ecological factor?
The cause of the density of the population decrease and explain the presence or absence of individuals in a habitat
What are biological cycles?
Species repeatedly experience periods of growth and decline in their population size
What is biodiversity?
Variety of species living in a community.
what are the 4 Interactions between individuals in a community?
Competition, predation, mutualism, and commensalism.
What is competition?
An interaction between living organisms that are looking for access to the same resources in their habitat.
What is intraspecific?
Competition between animals of the same species.
what is interspecific?
Competition between animals of different species.
What is mutualism?
Interaction between two living organisms that benefits both.
