. The Biological bulletin. Biology; Zoology; Marine biology. BIOLOGY OF OITHONA SIMILIS, GULF OF MAINE 169 and summer. Elsewhere in Canadian waters, however, it has been reported widespread offshore during the summer (Herdman, Thompson, and Scott, 1898; T. Scott, 1905; Pinhey, 1926).' In 1931-32 O. similis was taken to some extent throughout the Gulf of Maine and Bay of Fundy, the most noticeable changes in the quanti- tative distribution of the adult stock occurring with the vernal warming of the water. In April, 1932 it was most numerous (up to 5,423 per minute) in the western area of the Gu
. The Biological bulletin. Biology; Zoology; Marine biology. BIOLOGY OF OITHONA SIMILIS, GULF OF MAINE 169 and summer. Elsewhere in Canadian waters, however, it has been reported widespread offshore during the summer (Herdman, Thompson, and Scott, 1898; T. Scott, 1905; Pinhey, 1926).' In 1931-32 O. similis was taken to some extent throughout the Gulf of Maine and Bay of Fundy, the most noticeable changes in the quanti- tative distribution of the adult stock occurring with the vernal warming of the water. In April, 1932 it was most numerous (up to 5,423 per minute) in the western area of the Gulf with smaller and apparently more local centers of abundance in the Middle Channel, off Yarmouth, and off Halifax. In the outer basin of the Gulf it was almost totally absent in the hauls (Fig. 1).. + + K., zii- â¢â â â ; â f ⢠0 v, ...⢠X:y ^^Â¥ 1043^*^ + Fig. I. Distribution of adults of Oithotm similis in April, 1932. Number per minute of towing. The changes in distribution from April to May would suggest that Oithona tends to withdraw into deeper water in winter, and approaches the coast with rising temperatures in the spring. By the end of May the greatest number of adults (6,087 per minute) was found at the innermost station off Casco Bay where the surface temperature was ° C, although they were abundant throughout the western area (°° C.) and in the Bay of Fundy along the course of the entering drift. The richest hauls at this time were everywhere ob-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaste
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