. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ACTIVITY AS FUNCTION OF LATITUDE 175 At minimal temperatures (bottom, three curves) the absolute rate of pump- ing increases with increasing weight, until a certain point and then declines with increasing weight. This decline in absolute pumping rate with increasing weight is slower in higher latitudes. The fact that at their local minimal temperatures the northern animals can grow larger and yet remain as active as a much smaller animal 180 160 140 120 orlOO I o •~. 280 60 40 20. 10 20 30 40 50 WT. or SOFT PARTS IN GRAMS 60
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ACTIVITY AS FUNCTION OF LATITUDE 175 At minimal temperatures (bottom, three curves) the absolute rate of pump- ing increases with increasing weight, until a certain point and then declines with increasing weight. This decline in absolute pumping rate with increasing weight is slower in higher latitudes. The fact that at their local minimal temperatures the northern animals can grow larger and yet remain as active as a much smaller animal 180 160 140 120 orlOO I o •~. 280 60 40 20. 10 20 30 40 50 WT. or SOFT PARTS IN GRAMS 60 70 FIGURE 3. Weight-specific rate of pumping of Mytilus californianus from different latitudes at approximately minimal temperatures at these latitudes. A Los Angeles at 10° C.; • Fort Ross at 9° C.; O Friday Harbor at 5° C. Variation of rate in either direction not greater than ^Vn, where n is from a southern locality at its own minimal temperature, correlates well with the known larger size of animals from higher latitudes. The weight-specific rate of pumping of the mussels from different latitudes ap- pear identical at the minimal temperatures encountered at the respective latitudes (Fig. 3) (according to best available sources—Scripps Institute of Oceanography and U. S. Coast and Geodetic Survey), except that the decline in rate of activity per gram in larger animals is slower in samples from the higher 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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