. The Biological bulletin. Biology; Zoology; Marine biology. 14 CAROLYN BECKMAN AND ROBERT MENZIES of Limnoria damage are extensive in the area, more often than not the burrows are empty and finding infested wood is sometimes a difficult job. North of Cape Cod, at Eastport, Maine, for example, the sea water temperature reaches 10° C. for only three months of the year. In such a situation we would not expect Limnoria tripunctata and to our knowledge the only species found there is Limnoria lignorum. On the Pacific Coast of North America the species is not known as far north as Friday Harbor, Wa
. The Biological bulletin. Biology; Zoology; Marine biology. 14 CAROLYN BECKMAN AND ROBERT MENZIES of Limnoria damage are extensive in the area, more often than not the burrows are empty and finding infested wood is sometimes a difficult job. North of Cape Cod, at Eastport, Maine, for example, the sea water temperature reaches 10° C. for only three months of the year. In such a situation we would not expect Limnoria tripunctata and to our knowledge the only species found there is Limnoria lignorum. On the Pacific Coast of North America the species is not known as far north as Friday Harbor, Washington. Here the mean temperature of the surface sea water rises to 10-11° C. for only three months out of the year. During the re-. Figure 2. Geographical distribution, mean monthly surface sea water temperatures plotted at approximate longitude and reproductive temperature limits (the horizontal lines connected by the sloping block) : The shaded areas represent the period of time that the temperature is within the reproductive range of the species. The minimum reproductive temperature, 14° C, is estimated from the average of the three experiments to be at this temperature. At this point one young would be produced for each adult. maining months it is lower than 10° C. This would give the species three months to feed, and no period of time suitable for reproduction. Southward, the species is also absent at Crescent City, California. Here temperatures rise above 10° C. for ten months of the year. The maximum temperature is 13° C. and this occurs for only two months of the year; 15° C. is not reached seasonally. The species occurs along the Pacific Coast from San Francisco, California, to Mazatlan, Mexico, and probably as far south as Panama. At San Ouentin, San Francisco Bay, lethal temperatures do not occur seasonally and temperatures favor-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - co
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