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A Statistical Study of Variation In The Catch of Plankton Nets

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Statement of the Problem.—In a previous communication, Winsor and
Walford (1936) analyzed the results of repeated vertical hauls of different
types of plankton nets, making use of data available in the literature. They
concluded that the observed rcsidts could be accounted for reasonably well
on the assumptions that (a) the organisms were randomly distributed in
the medium and (b) that the volume of medium effectively sampled varied
from haul to haul. From this result it follows that as the total catch is
increased (as by increasing the net size) the reliability of a population esti
mate is ultimately limited by variation in volume sampled; and that where
such conditions hold, it is useless to attempt greater accuracy by increasing
either the total catch or the fraction counted much beyond the point where
100 organisms of the kind in question are counted.

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Detail Information

Series Title

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Call Number

577.77 Win a

Publisher

University of california : SEARS FOUNDATION: JOURNAL OF MARINE RESEARCH., 1940

Collation

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Language

English

ISBN/ISSN

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Classification

577.77

Content Type

text

Media Type

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Edition

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Subject(s)

Aquatic ecology
Pengambilan sampel (Statistik)

Specific Detail Info

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Statement of Responsibility

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