. The Biological bulletin. Biology; Zoology; Marine biology. DIURNAL MIGRATION OF PLANKTON 411 been introduced—particularly the use of five simultaneous closing nets —allow special dependence to be placed upon the differences found among the hauls within a single series. Observations General Vertical Distribution The following three species of copepods comprise the bulk of the catches made: Metridia lucens (Boeck), Centropages typicus (Kr0yer), and Calanus finmarchicus (Gunner). In most of the hauls made at Stations 1285 and 1286 and in a few of those at Station 1287, quite large quantities of
. The Biological bulletin. Biology; Zoology; Marine biology. DIURNAL MIGRATION OF PLANKTON 411 been introduced—particularly the use of five simultaneous closing nets —allow special dependence to be placed upon the differences found among the hauls within a single series. Observations General Vertical Distribution The following three species of copepods comprise the bulk of the catches made: Metridia lucens (Boeck), Centropages typicus (Kr0yer), and Calanus finmarchicus (Gunner). In most of the hauls made at Stations 1285 and 1286 and in a few of those at Station 1287, quite large quantities of siphonophore fragments were taken as well. A general view of the numbers of each species of copepod present and of the relative depth at which each lives may be obtained from Fig. 3. CENTROPAGES METRIDIA LUCENS TYPICUS CALANUS FINMARCHICUS <? 9 im: <j 9 im <? s cop v cop iv cop. Fig. 3. General view of the vertical distribution and the relative numbers of the three species of copepods studied. The diagram for the adult females of Metridia is plotted on one-half the scale of the others. The depth at which light intensities of 1000 microwatts, 100 microwatts, etc., occurred are indicated by the horizontal lines. (One microwatt may be taken as approximately equal to three meter-candles as used by Poole and Atkins, 1929.) The upper five hauls (A244 to A248) were made at 1439 o'clock, the lower five (Nos. A249 to A253) at 1515 o'clock on July 11, 1932, at Station 1287. The diagrams, constructed in the usual way (cf. Russell, 1925), repre- sent the copepod population down to 114 meters at Station 1287 early in the afternoon of July 11, 1932. This particular series has been selected as being the most complete and representative. The numerical data for all the series are presented in Tables I, II, and Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustr
Size: 2078px × 1203px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
