. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DJFMANJJASONDJF MONTHS FIGURE 2. Seasonal abundance of Hydractinia and species of hermit crabs from Bogue Sound, P. annul. = Pagurus annulipcs. P. brer. — P. brcz'idactylus, P. lony. = P. longicarpus, P. poll. = P. pollicaris. annnllpcs or P. brcz'idactylus but was frequently found on shells inhabited by P. longicarpus and P. pollicaris. Hermit crabs and Hydractinia shells were more abundant from November through February than from March through October (Fig. 2). From November, 1972, to February, 1973, numbers of hermit crab
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DJFMANJJASONDJF MONTHS FIGURE 2. Seasonal abundance of Hydractinia and species of hermit crabs from Bogue Sound, P. annul. = Pagurus annulipcs. P. brer. — P. brcz'idactylus, P. lony. = P. longicarpus, P. poll. = P. pollicaris. annnllpcs or P. brcz'idactylus but was frequently found on shells inhabited by P. longicarpus and P. pollicaris. Hermit crabs and Hydractinia shells were more abundant from November through February than from March through October (Fig. 2). From November, 1972, to February, 1973, numbers of hermit crabs increased markedly with P. longicarpus showing the greatest increase. Concurrent increases in Hydractinia shells occupied by P. longicarpus and P. pollicaris occurred during these months; however, no appreciable increase was evident in Hydractinia shells occupied by P. annulipcs or P. brevidactylus. Shell-selection experiments Two types of experiments were conducted to determine whether each hermit crab species exhibited shell preference behavior relating to the presence of Hydrac- tinia or the perisarcal remains of a dead Hydractinia colony. Experiments I and II ("two-choice" experiments) showed that shell preferences exist, while experi- ments III and IV ("single-choice" experiments) indicated the degree of rejection of a hydroid-covered or perisarc-covered shell. Experiment I: Hydractinia shell (HS) vs. plain shell (PS). In this experi- ment P. annulipcs and P. longicarpus rejected HS shells more often than expected on the basis of chance and P. pollicaris accepted HS shells more often than expected. 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
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
