. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SAGITTA ELEGANS ON GEORGES BANK 221 The present investigation, based as it is on a much larger number of hauls on Georges Bank itself, not only tends to confirm the general suggestions of Redfield and Beale, but also provides strong evidence on the degree of permanence of the bank water. On the other hand, scrutiny of all the present data indicates that ecological factors other than simple transportation and accumulation play important roles in determining the distribution and abundance of the plankton. Redfield and Beale th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SAGITTA ELEGANS ON GEORGES BANK 221 The present investigation, based as it is on a much larger number of hauls on Georges Bank itself, not only tends to confirm the general suggestions of Redfield and Beale, but also provides strong evidence on the degree of permanence of the bank water. On the other hand, scrutiny of all the present data indicates that ecological factors other than simple transportation and accumulation play important roles in determining the distribution and abundance of the plankton. Redfield and Beale themselves point out that the central area of the Gulf of Maine supports a rich endemic population of Crustacea in spite of the fact that. FIGURE 10. Comparison of the horizontal distribution of certain species of plankton in September 1939 (cruise 89). Distribution of Sagitta elegans is compared with that of S. serrato- dentata, S. enflata, Pseudocalanus minutus, and Calanns finmarchiciis. Values shown are average numbers per cubic meter (per 10 cubic meters for 5. elegans) for the whole water column for all stages of each species. Plankton Sampler hauls. Occurrence records for 5. serratodentata and S. elegans are from the 75 cm. silk net hauls. The boundary of the Mixed Area is indicated by the heavy broken line. The symbol "X" represents a value of less than one individual per unit volume. these animals are presumably subject to the same dislocating action of the currents as was invoked to explain the scarcity of S. elegans in that area. The agreement of the distribution of 5. elegans and of certain other species of plankton with the disposition of the water masses on Georges Bank during the present survey is well illustrated by the comparison for the cruise of September 1939, presented in Figure 10. Allusion has been made above to the close con- formity of the main abundance of Sagitta elegans to the limits of the Mixed Area. Please note that these images are extrac
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
