## Ecological MethodologyEcological Methodology, Second Edition provides a balance of material on animal and plant populations, and teaches students of ecology how to design efficient tests in order to obtain maximum precision with minimal work. |

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Page 212

circa 1/m2 Figure 6.1 The idea of stratification in estimating the size of a plant or

animal population. Stratification is made on the basis of population density.

**Stratum**A, density circa 10/m2**Stratum**B, density circa 5/m2**Stratum**C, densitycirca 1/m2 Figure 6.1 The idea of stratification in estimating the size of a plant or

animal population. Stratification is made on the basis of population density.

Page 213

sample systematically within a

then mean that it would be difficult to estimate how reliable such sampling is. So it

is recommended that you sample randomly within each

...

sample systematically within a

**stratum**. But the usual problems outlined abovethen mean that it would be difficult to estimate how reliable such sampling is. So it

is recommended that you sample randomly within each

**stratum**. Ecologists have...

Page 219

Box 6.3 OPTIMAL AND PROPORTIONAL ALLOCATION IN STRATIFIED

RANDOM SAMPLING Russell ( 1 972) sampled a clam population using stratified

random sampling and obtained the following data:

calculated as in ...

Box 6.3 OPTIMAL AND PROPORTIONAL ALLOCATION IN STRATIFIED

RANDOM SAMPLING Russell ( 1 972) sampled a clam population using stratified

random sampling and obtained the following data:

**Stratum**weights arecalculated as in ...

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Ecological Methodology Charles J. Krebs,CHARLES L. KREBS,Professor of Zoology Charles J Krebs No preview available - 1999 |

### Common terms and phrases

abundance aerial analysis aphids Appendix assumptions bias calculations capture Caughley Chapter clumped coefficient of variation confidence interval confidence limits defined density estimate distance ecological ecologists END-OF-FILE equal catchability equation estimate of population estimate population example Figure finite population FORMAT 2X,'ENTER formula frequency distribution index of dispersion level of precision line transect mark-recapture marked animals Morisita nearest neighbor negative binomial distribution niche breadth niche overlap normal distribution null hypothesis Number of animals Number of individuals number of quadrats number of samples number of species observed obtained parameters Petersen plot Poisson distribution population density population estimate probability problem Program proportion quadrat counts random points random sampling ratio READ regression resource sample size sample sizes sampling unit Seber second sample sequential sampling simple random sampling spatial pattern standard error statistical statistical population stratum study area survival rate Table techniques Total number transformation unmarked variable variance voles