. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 46 PAUL A. DEHNEL o x LJ cn O O 0,7 0,5 02. MYTILUS CALIFOR Nl ANUS SHELL LENGTH SO. CALIF. 1954 SO. CALIF. 1954 FT. ALASKA 1952 FT. 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 TIME IN DAYS FIGURE 1. A comparison of the rate of growth in length of shell in populations of Mytilns californianus from Mount Edgecumbe, Alaska at one intertidal level, and Big Rock, California at two intertidal levels. Each point represents the mean k value for a sample of fifty or more individuals. The in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 46 PAUL A. DEHNEL o x LJ cn O O 0,7 0,5 02. MYTILUS CALIFOR Nl ANUS SHELL LENGTH SO. CALIF. 1954 SO. CALIF. 1954 FT. ALASKA 1952 FT. 0 15 30 45 60 75 90 105 120 135 150 165 180 195 210 TIME IN DAYS FIGURE 1. A comparison of the rate of growth in length of shell in populations of Mytilns californianus from Mount Edgecumbe, Alaska at one intertidal level, and Big Rock, California at two intertidal levels. Each point represents the mean k value for a sample of fifty or more individuals. The initial value is plotted on the day at which the second measurement was made. instantaneous relative growth rates of the length, width and height of the shell were plotted as a function of time (Figs. 1, 2, 3). The initial value is plotted on the day at which the second measurement was made. The means of the initial length, width and height of the shell are about 25% greater for the southern California mussels sampled than for northern ones. Pre- sumably, similar size in latitudinally separated populations of a given species indi- cates different chronological ages, the northern ones being older (Wimpenny, 1941). Hence, samples of the northern and southern populations under consideration should be approximately the same age. A small initial size was chosen, as growth rates are more rapid in young animals. RESULTS Growth rate in latitudinally separated populations When the instantaneous relative growth rate of the length of the shell is plotted as a function of time (days), it is seen that the rate of linear size increase of this. 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; Lilli
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
