Bio Lab 10 Flashcards
Ecology
Interactions between organisms and their environment
What is this view
Skin out
What to community ecologists study
Assemblage of directly or indirectly interacting populations living in a habitat and how interactions affect structure and organization of community
Population
Group of individuals of one species in an area
Competition
One organisms deprives another of a resource causing it to grow more slowly leve fewer offspring and die more quickly
Predation
Interaction in which one organism kills another organism and eats it completely
Grazing
Organism takes part of prey
Detritivory
Consumption of dead organic matter essential to nutrient cycling
Parasitism is similar to but different in that
Predation
Symbiosis
How are communities described
Diversity (variety of diff. Organisms) abundance
Number of different species is
Species richness
Most biooogically meaningful measurement is either
Number of individuals or total biomass
Sampling methods
Estimate number of species and abundance
Sessile
Transact lines directly under transfer or within quadrant
Aquatic environment mobile
Swine net, bait traps, swim in specified area for certain amount of time recording
Terrestrial
Pitfall traps
What must they consider when setting traps
Number of traps and best spatial arrangement and how to avoid bias
What do they plot
Species accumulation curves
Accumulation rate of newly discovered species
Y axis v x axis
Total number of species represented
Cumulative number of samples
Why does it rise steeply at first then gradually
Many species found in initial sample
Slowly as rare species
When curve levels off and addition of new doesn’t result in
Additional species collected enough
Why are abiotic factors important
Why different habitat suitable for different species
What other two things besides temperature and rainfall
Determine
Soil characteristics and light intensity
Determine which plants live
Plants may do what
Shade out
Provide camouflage
Production depends on soil as primary producers
