Skip to main content
    • Aa
    • Aa

Sond cruise 1965: Factor and cluster analyses of the plankton results, a general summary

  • M. V Angel (a1) and M. J. R Fasham

1. The data for five planktonic taxa sampled during the SOND cruise (autumn 1965) by R.R.S. ‘Discovery’ in a day and a night series of horizontally towed nets have been analysed by factor and cluster analyses.

2. The factor analyses of hauls showed that there were five biologically distinct zones in the water column between the surface and 1000 m. The zones were more distinct in the day series than in the night.

3. Factor analyses of the individual taxa gave sensible groupings of species and the factor score plots gave ‘averaged’ depth distributions for each group.

4. Cluster analyses of the individual taxa gave results consistent with the factor analyses. Both methods gave groupings which fitted the zonation patterns of the hauls, except for the two zones between 100 and 460 m at night.

5. Only cluster analyses could be carried out on the total data matrices. Although satisfactory interpretation was only possible with the aid of the analyses of the individual taxa, the zonation and species groupings were again largely retained.

6. The zonation of the planktonic taxa is shown to be very similar to that described for nektonic species sampled on the same cruise.

7. The usefulness of these analytical methods is compared with the conclusions of other investigators. It is concluded that the rotation of the matrices to simple structure in the factor analysis gave a marked improvement in the ease of interpretation.

8. For this data, principal component analyses gave very similar results to the full factor analyses.

Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

J. P Barkham . & J. M. Norris , 1970. Multivariate procedures in an investigation of vegetation and soil relations of two beechwoods, Cotswold Hills. Ecology, 51, 630–9.

J. B. Carrol , 1953. An analytical solution for approximating simple structure in factor analysis. Psychometrika, 18, 2338.

R. M. Cassie , 1962. Frequency distribution in the ecology of plankton and other organisms. Journal of Animal Ecology, 31, 6582.

J. M. Colebrook , 1969. Variability in the plankton. In Progress in Oceanography (ed. M. Sears ), vol. 5, pp. 115–25. Oxford: Pergamon Press.

E. W. Fager & I. A. Mcgowan , 1963. Zooplankton species groups in the North Pacific. Science, 140, 453–60.

D. W. Goodall , 1954. Objective methods for the classification of vegetation. III. An essay in the use of factor analysis. Australian Journal of Botany, 2, 304–24.

L. Guttman , 1954. Some necessary conditions for common factor analysis. Psychometrika, 19, 149–61.

R. N Hughes . & M. L. H. Thomas , 1971 a. The classification and ordination of shallow-water benthic samples from Prince Edward Island, Canada. Journal of Experimental Marine Biology and Ecology, 7, 139.

R. N. Hughes & M. L. H. Thomas , 1971 b. Classification and ordination of benthic samples from Bedeque Bay and estuary Prince Edward Island, Canada. Marine Biology, 10, 227–35.

C. J. Jardine , N. Jardine & R. Sibson , 1967. The structure and construction of taxonomic hierarchies. Mathematical Biosciences, 1, 173–9.

N. Jardine & R. Sibson , 1968. The construction of hierarchic and non-hierarchic classifications. Computer Journal, 11, 177–84.

H. F. Kaiser , 1958. The varimax criterion for analytic rotation in factor analysis. Psychometrika, 23, 187200.

G. N. Lance & W. J. Williams , 1967. A general theory of classificatory sorting systems. 1. Hierarchical systems. Computer Journal, 9, 373–80.

L. Orloci , 1967. An agglomerative method for classification of plant communities. Journal of Ecology, 55, 193205.

H. S. J. Roe , 1972 a. The vertical distribution and diurnal migrations of calanoid copepods collected on the SOND cruise 1965. I. The total population and general discussion. Journal of the Marine Biological Association of the United Kingdom, 52, 277314.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of the Marine Biological Association of the United Kingdom
  • ISSN: 0025-3154
  • EISSN: 1469-7769
  • URL: /core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom
Please enter your name
Please enter a valid email address
Who would you like to send this to? *


Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 2 *
Loading metrics...

Abstract views

Total abstract views: 309 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 23rd June 2017. This data will be updated every 24 hours.