Lecture 3 Flashcards
What is a time constrained search?
An area is actively searched for a predetermined amount of time
What are some pros and cons of time constrained search?
Pro: no specialized gear, rapid, good for preliminary surveys
Cons: Hard to standardize effort, cannot reliably estimate density
What is an area constrained search?
A defined amount of area is actively searched, exhaustively
What are some pros and cons of area constrained search?
Pros: more repeatable
Cons: difficult to stay within defined area, more planning
What is the transect method?
A survery line of a prescribed length is selected, and observers use the line as a base from which to make observations
What are pros and cons of transects?
Pros: easier to stay within search area, easier to plan
What is quadrat sampling?
Search a predetermined number of randomly placed quadrats of equal size within a focal area
What are some pros and cons of quadrats?
pros: good for density estimates, catch per unit effort lower than time constrained searches
cons: need some gear
What are coverboard surveys?
deploy a pre determined number of artificial cover objects in an area and return to flip these objects periodically
What are pros and cons of coverboard surveys
Pros: best option for repeated surveys, good for area lacking flip cover, standardized effort, not destroying natural cover
cons: maybe funds, need to set up
What is the quadrat method?
search a predetermined number of randomly places quadrats of equal size within a focal area
What are pros and cons of quadrats
Pro: CPUE lower, good for abundance estimates
Cons: need some gear, more setup
What is coverboard surveys?
Deploy a predetermined number of artificial cover objects in an area and return to flip them periodically
What are pros and cons of coverboard surveys?
Pros: best for repeated surveys, good for areas lacking flip covers, standardized effort
cons: cost? setup/replacement
What size coverboards should you use?
5cm thickness and no smaller than 10x10
