TRANSECT LINE Flashcards
(TRUE/FALSE) Sampling plants or animals with quadrats is not the only alternative to mark-recapture estimation of abundance.
TRUE
provide a third general class of methods
for estimating abundance in plant and animal populations, and in addition to mark-recapture and quadrat counts provide an important tool for the field ecologist.
PLOTLESS METHODS
POPULATION ESTIMATE N FORMULA
Population Estimate N = ((total study area)/(transect area)) x mean number of individuals per transect
where four sides of a specific proportion of an area of habitat are utilized to know the level of biodiversity in a certain environment as it is used to estimate population abundance, density, frequency, and distributions
QUADRAT SAMPLING
Ecologists capture animals and mark
them with tags, paint, markings, or bands.
MARK-RECAPTURE MODEL
Advantages of line transect sampling
-cost - efficient than aerial spatial sampling
- faster observations; time convenient
- larger areas of observation due
to machine efficiency
Disadvantages of line transect sampling
- further research in low visibility areas
- transect lines would not be straight as it will depend on the direction of the roads
- cannot be utilized in environments
that has low productivity and diversity
It is the preliminary survey conducted by researchers before the actual data collection
RECONNAISSANCE SURVEY
Which plant is the most tolerant to salty conditions?
Couch grass since it is most abundant near the beach. This means that it thrives in high salinity area and has developed advantageous traits tolerating salty conditions.
Which plant/s grows in areas where grazing animals excrete their waste?
Groundsels, yarrow, and nettles thrive farther from the beach because it indicates that they are not salinity-tolerant and dependent on high nutrients and soil moisture accumulated from animal feces.
IT IS OFTEN USED WHEN DIVERSITY IN A PARTICULAR ENVIRONMENT IS HIGH OR COMPLEX.
QUADRAT SAMPLING
UTILIZES AN ELONGATED PLOT EXCLUDING WIDTH THAT PORTRAYS A LINE AS THE LIMITATION IN SAMPLING WHEREAS IT IS TYPICALLY USED TO OBSERVE DIVERSITY OF A
SIMPLE OR LOW DIVERSITY ENVIRONMENT.
LINE TRANSECT SAMPLING
What benthic macroinvertebrates thrive in a GOOD WATER QUALITY environment?
Cadisfly, Mayfly, Stonefly, Water penny
What benthic macroinvertebrates are tolerant of FAIR WATER QUALITY environment?
Alderfly larva, Cranefly larva, Dragonfly nymph, Water snipefly larva
What benthic macroinvertebrates are VERY TOLERANT to poor water quality?
Blackfly larva, leeches, midge larva, Pouch snail
