Chapter 4, Estimating Density: Quadrat Counts

Chapter 4 Estimating density : Quadrat Counts (Version 5, 27 January 2017) Page Quadrat SIZE AND SHAPE .. 137 Wiegert's Method ..141 Hendricks' Method ..146 When Should You Ignore these Recommendations ? ..148 STATISTICAL DISTRIBUTIONS .. 149 Poisson Distribution ..151 Negative Binomial Distribution ..160 LINE INTERCEPT METHOD .. 178 AERIAL SURVEYS OF WILDLIFE 182 Correcting for Bias in Aerial Surveys ..186 Sampling in Aerial Surveys ..189 SUMMARY .. 200 SELECTED 201 QUESTIONS AND PROBLEMS .. 192 Counts of plants or animals on areas of known size are among the oldest techniques in ecology. Counts are simple to comprehend and can be used in a great variety of ways on organisms as diverse as trees, shrubs, barnacles, kangaroos, and sea-birds. The basic requirements of all these techniques are only two: (1) that the area (or volume) counted is known so that density is determined directly, and (2) that the organisms are relatively immobile during the counting period so none are missed.

CHAPTER 4 . ESTIMATING DENSITY: QUADRAT COUNTS (Version 5, 27 January 2017) Page. ... Chapter 4 Page 141 . of quadrats. In both methods it is essential that data from all quadrats be standardized to a single unit area – for example, per square meter. This conversion is simple for

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