Estimation of sample zooplankton abundance from Folsom splitter sub-samples

Procedures are described for estimating the abundance of each zooplanklon species in a sample after counting at least two sub-samples from a Folsom splitter. A multinomiai model is assumed for the splitting process. The method may be summarized as follows: two sub-samples, balanced with respect to t...

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Bibliographic Details
Published in:Journal of plankton research 1984, Vol.6 (5), p.721-731
Main Authors: Griffiths, F.B., Brown, G.H., Reid, D.D., Parker, R.R.
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Brackish
Freshwater
Fundamental and applied biological sciences. Psychology
Marine
Sea water ecosystems
Synecology
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Summary:Procedures are described for estimating the abundance of each zooplanklon species in a sample after counting at least two sub-samples from a Folsom splitter. A multinomiai model is assumed for the splitting process. The method may be summarized as follows: two sub-samples, balanced with respect to the left — right splits, are counted. The counts for each species are tested for homogeneity using a x2 test. If the counts are homogeneous, an estimator is given which permits the estimation of the number of animals in the sample, and the variance of this estimate. If the subsample counts are heterogeneous, it is assumed that clumping has occurred. A procedure is described in which additional sub-samples are counted to locate the clump, and estimators of abundance (and variance estimators) are derived. If the splitter bias is
ISSN:0142-7873
1464-3774
DOI:10.1093/plankt/6.5.721