. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SNAIL RESPONSE TO CRAB EFFLUENTS 367 Table III Stti/islical tests of the effects of five factors on the response r/Nucella lamellosa to the effluent from five crustaceans f-values for snarls turning towards and away from effluent source vs.: (e) Direction snail (a) Year of (b) Seawater (c) Snail (d) Snail turned with Effluent source experiment tray size locality respect to itself Cancer productus ' Hemigrapsus nudus ND ND Pugettia producta
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SNAIL RESPONSE TO CRAB EFFLUENTS 367 Table III Stti/islical tests of the effects of five factors on the response r/Nucella lamellosa to the effluent from five crustaceans f-values for snarls turning towards and away from effluent source vs.: (e) Direction snail (a) Year of (b) Seawater (c) Snail (d) Snail turned with Effluent source experiment tray size locality respect to itself Cancer productus ' Hemigrapsus nudus ND ND Pugettia producta Lopholnhodes mandtii ND ND Da/anus glandula ND Data were pooled from all trials with a given effluent source, f-values, from 2x2 contingency tables, indicate the significance of the relationship between the listed variable's states and N. lamellosa responses (towards or away from effluent source). See Table I for variable states except column e (to apertural lip, or to columella). See Figure 3 for sample sizes and means for snail locality. The remaining means from these many analyses are not presented in the interest of economy, but may be obtained from the authors on request. ' = 2 (as for Table I). ND = no data. snails that turned aperturally when the effluent sources were P. producta, L. mandtii, and B. glandula were not significantly different from expected. Thus, incorporating the bias introduced by starting orientation had no effect on the results. Differences between populations of snails Nucella lamellosa from Grappler Inlet, the Ross Islets, and lab-acclimatized snails from Grappler Inlet, all ex- hibited a statistically significant avoidance of C. productus effluent (Fig. 3, Table II). Those from the Ross Islets ex- hibited as strong a response as those from Grappler Inlet. The proportion of lab-acclimatized snails that avoided C. productus was larger than that of freshly collected snails but was less signific
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
