. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DEFENSIVE SECRETIONS OF O. BOREALIS 401 8 o LJ 0) 4- o F o • Onchidella borealis A Collisella digitalis m Notoacmea scutum. 12 FIGURE 4. Cumulative number of Onchidella borealis, Collisella digitalis, and Notoacmaea scutum consumed by Leptasterias hexactis in laboratory (solid lines and points) and field (broken lines and open points) experiments in which prey were replaced as eaten. Error bars are standard deviations. In lab trials (n = 2), each bowl contained 10 individuals of each potential prey species. Field cages (n =
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DEFENSIVE SECRETIONS OF O. BOREALIS 401 8 o LJ 0) 4- o F o • Onchidella borealis A Collisella digitalis m Notoacmea scutum. 12 FIGURE 4. Cumulative number of Onchidella borealis, Collisella digitalis, and Notoacmaea scutum consumed by Leptasterias hexactis in laboratory (solid lines and points) and field (broken lines and open points) experiments in which prey were replaced as eaten. Error bars are standard deviations. In lab trials (n = 2), each bowl contained 10 individuals of each potential prey species. Field cages (n = 2) each con- tained three individuals of each prey species. never attacked O. borealis and seldom changed the direction of its movement in response to the snails. Predatory shelled snails, Searlesia dira and Thais lamellosa, showed no response to Onchidella borealis. Onchidella borealis were apparently paltatable to crabs (Hemigrapsus nudus)\ the crabs consumed dead snails readily in laboratory experiments. Live O. borealis were consumed less frequently, suggesting that the repugnatorial glands may reduce the predation pressure by crabs. However, our experiments with the crabs do not distin- guish between the actual effects of the repugnatorial glands and other factors associ- ated with live animals such as crawling behaviors, actively modified distributions. lOOi § 80- 60- 40- vv 22. H m w O borealis control Laboratory Field FIGURE 5. Percentage of Leptasterias hexactis remaining in holdfasts containing Onchidella borealis and no O. borealis in the laboratory and the field. Error bars are standard 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 Rattr
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
