population size and ecosystems 3.5 Flashcards
what is the definition of community
all the species living within a particular area
what’s an example of community
cows, humans, bacteria, trees that all live in an area
what’s the definition of ecology
study of the interactions between living organisms and their habitat
what’s an example of ecology
studying how adding a new species (japanese knot weed) affects the environment
what’s the definition of ecosystem
interactions between the living and non living factors in an area
what’s an example of ecosystem
how temp increasing effects water levels in a pond which affect plant population and then animal population
what’s the definition of environment
all external conditions affecting an organism
what is an example of environment
how temp/ oxygen levels will affect the organisms in a pond which
what’s the definition of habitat
the area an organism occupies
what’s an example of habitat
pond
what’s the definition of niche
the role and position a species has within its environment
what’s an example of niche
the hedgehog occupies a nocturnal, insectivorous niche in british woodlands
what’s the definition of population
the total number of a single species within a given area
what’s an example of population
number of cows in cowbridge
what is an abiotic environment
something that affects the non living part of an environment
what’s an example of abiotic environment
light, temperature, water
what is climatic factors
effects of the weather
what is a biotic environment
effects of the living community
what’s an example of biotic environment
predation, disease, competition
what is topographic factors
angle and aspect of slope
what’s an example of topographic factors
sheltered from wind or into wind
what’s edaphic factors
factors associated with the soil
whats an example of edaphic factors
texture, pH, temperature
what’s immigration
amount of movement INTO a population
what’s emigration
amount of movement OUT of a population
what’s birth rate
number of individuals being born into a population
what’s death rate
number of individuals dying within the population
what are factors that can increase a population size
- lots of sunlight
- lots of water
- little competition
- good temperature
- immigration
what are factors that can decrease a population size
- lack of sunlight
- lack of water
- lots of competition
- lots of predation
what is a density dependent factor
any factor that becomes more important the higher the population becomes
what’s an example of density dependent factor
food
water
what is a density independent factor
any factor that has the same influence regardless of the number organisms
what’s an example of a density independent factor
weather, natural disasters
what’s the name for a growth curve
sigmoidal growth curve
what’s carrying capacity
maximum number of organisms a habitat can contain
what is a predator
kills and eats other animals for food
