. Bulletin. Natural history; Natural history. Moran: Phytoplankton 333 distribution of species was the common situation. CLUSTER ANALYSIS A cluster analysis technique using a modified Jaccard similarity index was applied to an extensive collection taken on 26 July 1976. The purpose was to test for any station- or depth-related distribution patterns among the phytoplankton within the main lake and bays (Fig. 6). The results were presented in the form of a computer-generated dendrogram (Fig. 7) which was divided into six clusters, designated A through F. The most striking feature of the
. Bulletin. Natural history; Natural history. Moran: Phytoplankton 333 distribution of species was the common situation. CLUSTER ANALYSIS A cluster analysis technique using a modified Jaccard similarity index was applied to an extensive collection taken on 26 July 1976. The purpose was to test for any station- or depth-related distribution patterns among the phytoplankton within the main lake and bays (Fig. 6). The results were presented in the form of a computer-generated dendrogram (Fig. 7) which was divided into six clusters, designated A through F. The most striking feature of the analysis is the high degree of similarity among all stations ( or higher) with 97 percent of the comparisons having a similarity index above No relationship between bay location and clustering was evident. The lake samples (designated by the prefix L in the station code) generally clustered with the cooling-loop stations (LOll through L151) in groups A, B, and C and the control-arm stations (L161 through L204) in groups C, D, and F. The lake samples taken from the lower depths (designated by the last number of the station code) were generally distributed through all of the cluster groups. Thus, while some patterns were displayed by the analysis, the overall level of similarity was quite high. The similarity of the bay and lake samples indicated that their waters were in intimate contact with one another. Using a similar cluster analysis on the zooplankton data, Waite (1977) found that the zooplankton clusters were separated primarily by season. Within BOIO , (BOOS L07I L075. Fig 6 —Stations sampled for phytoplankton cluster analysis, 26 July 1976. Lake stations are marked by an asterisk and the station code prefix L Bay stations are marked by a dot and the station code prefix B The first two integers of the station code are the sample number, and the third is the depth in meters at which the sample was Please note that these images are extracted from
Size: 1749px × 1428px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
