Activity : Some Common Biotic Sampling Methods Flashcards
Populations and communities may be describes in terms of _____, _______, and ______
Density, frequency, and biomass
The total number of individuals in a given area
Abundance (N)
Number of individuals per unit or volume
Density (D)
Proportion of individuals of a species compared to total individuals of all species
Relative Species Diversity
Number of individuals of a given species from one location or time expressed as a proportion of the total number of individuals of that species for all locations more time sample
Relative Population Density
Number of samples containing a species, expressed as a proportion of total samples
Frequency
The frequency of the species divided by the sum of the frequencies of all species in the community
Relative Frequency of a Species
Weight of individuals in a population; expressed as dry weight for accuracy
Biomass
limited to live/freshly killed, taxonomically similar organisms
Dry mass
Number of individuals in a species
Species abundance
Number of species in a population
Species richness
Area of known size is randomly chosen and all individuals identified by ecological measurement
Plot Sampling
Method used in plot sampling
Quadrat method
the belt may be divided into intervals representing zones
Transect Sampling
Method used in transect sampling
Belt transect
What is used to sweep invertebrates and foliage of herbs?
Sturdy net
Sampling methods that removes a small portion of habitat e.g., substrate/water at one time
Grab Sampling
What is used in collecting samples in grab sampling?
Scoop nets, dredges
Used for plankton sampling
Tow Net/Dip Net
(WIND SPEED) Less water flowing through net
Too fast
(WIND SPEED) Many organisms escape net
Too slow
The number of opening within the cross metal threads of a net
Mesh size
Expressed as numbers per cubic meter of
water
Density of organisms
Distance toward multiplied by the area of the net opening
Volume of water
