On the Reliability of Plankon-net

概要

論文の詳細を見る
The present author can recommend to employ the plankton-net for quantitative purposes, though with a certain limitation, according to the following considerations:- (1) It is not the right way to compare the quantitative gears of plankton merely based on the total catch without any regards to the composition of catch. Every gear has clearly its own limitation, as collection is generally selective according to kinds and sizes of plankton. (2) The gear, which shows the lowest Pearson's coefficient of variation concerning both total catch and composition, is most applicable. (3) Calculated from the results with net the coefficients are less than 30% for total catch and less than 15% for composition on an average. In this way, the results with net can be considered nearly true. In fact, these values are to a considerable extent diminishable. so far collection and computation are more carefully performed. (4) The total number of plankton individuals N and the percentages of plankton animal r correlate as N=Cr-k, C and k being constants. The existence of a correalation between N and r verifies the validity of net-collection on the other hand. (5) The correlation between N and r can be established widely in several sea areas around Japan. When the correlation cannot be established, it may be assumed that there occur plankton groups of different origins.
社団法人日本水産学会の論文