Complete and Sampled Counts

• Summary of Random Sampling types:

  Sample	Use	Advantages	Disadvantages
  SRS	small geographic area w/ not much variation, not many sample units	simple formulas	long travel time
  Stratified RS	distribution depends clearly on well defined attributes	more efficient estimates	its okay
  systematic sampling	anywhere, as long as first unit is randomly placed	best type, most efficient	problems with small samples

• Mark-recapture
  • mark resight: used for large animals or other animals that are not good to recapture
• Distance Sampling: plot and line samples; incomplete counts are corrected by visibility bias. Stand and look. Doesn't sound legit.
• Indicies: instead of counting the number of animals, count their "effects" (footprints, etc).
• Field methods for fish:
  • Pilot studies should be done first
  • Sampling should extensive, not intensively based
  • Fish distribution is different than for other animals--they are clumped tightly (they Hilborne and Walters, 1992)