. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 7 8 9 10 Snoil Size (mm) 12 10CM. 7 8 9 10 Snail Size (mm) 12 Figure 2. The influence of snail size (shell length) on handling times (A) and ingestion probabilities (B) in Physella virguta and Planorhella trivolvia, fed upon by Procambarus The error bars are standard errors of the mean. nificant effect on both dependent variables (the numbers of surviving snails above the waterline and the number of snails killed) (Fig. 3A. B, Table I). No significant effect of snail size was observed in P. virgata: all sizes o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 7 8 9 10 Snoil Size (mm) 12 10CM. 7 8 9 10 Snail Size (mm) 12 Figure 2. The influence of snail size (shell length) on handling times (A) and ingestion probabilities (B) in Physella virguta and Planorhella trivolvia, fed upon by Procambarus The error bars are standard errors of the mean. nificant effect on both dependent variables (the numbers of surviving snails above the waterline and the number of snails killed) (Fig. 3A. B, Table I). No significant effect of snail size was observed in P. virgata: all sizes of P. virgata were equally vulnerable and were equally likely to crawl above the waterline. In contrast, for P. trivolvis, both independent variables (predator presence, snail size) and the interaction between predator presence and snail size all were very significant (Fig. 4A, B, Table I). The significant size effect was due to the inverse relationship between size and both snail mortality and the number of surviving snails above the waterline. Smaller P. trivolvis were more likely than larger individuals to be eaten. In addition to being more vulnerable to P. simulans pre- dation, small (4-6 mm SL) P. trivolvis displayed the most prominent crawlout response, with most of the surviving snails above the waterline. Medium-sized specimens (6- 12 mm SL) of P. trivolvis were intermediate in vulnera- bility and were less likely than smaller animals to display the crawlout response. Larger (12-16 mm SL) specimens of P. trivolvis were least vulnerable and did not display an increase in crawlout response over that seen in pred- ator-free control aquaria. No significant level of mortality. 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 (W
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
