Question

4. Sampling methods for population ecology (a) Please explain the following sampling methods: Census Area-or volume-based surveys Mark-recapture method Line-transect survey Which method can produce the most accurate population data? This note is prepared by

Answer 1

Area- or volume based survey: A typical technique for deciding volumes from cross segments is that of normal end regions. It accept that the volume between progressive cross segments is the normal of their end territories increased by the separation between them. This is communicated in the formula: V (Ft.3 ) = [A1 (FT2 ) + A2 (Ft2 )]/2 X L (Ft) In which V is the volume in cubic feet, A1 and A2 are the end territories in square feet of progressive areas and L is the length in feet between the segments. (The end territories will be isolated by 2 to concoct the normal end region). This equation is useful when A1 approaches A2 in both zone and setup, yet is possibly estimated when the cross segments have various territories. It is commonly acknowledged as close enough for figuring earthwork volumes.

Line transect survey: A line transect is completed by unrolling the transect line along the angle distinguished. The species contacting the line may be recorded along the entire length of the line (continuous sampling). On the other hand, the nearness, or nonappearance of species at each stamped point is recorded (systematic sampling).

Mark recapture method: The Mark-Recapture technique is used to appraise the size of a populace where it is unfeasible to tally each person. The essential thought is that you capture a modest number of individuals, put a harmless mark on them, and discharge them once more into the populace.

which method can produce the most accurate population data: mark-recapture method. The precision of this mark-recapture method lays on various suppositions being met. The assumptions include - Births can still happen and an exact estimation can even now be made if an equivalent number of unmarked individuals leaved.