. The Biological bulletin. Biology; Zoology; Marine biology. HOST CHOICE IN A PEA CRAB 363 Einry choices <)/'Pinnixa chaetopterana Chaetopterus host-only experimenl from Amphitrite (() ihi Chamber cho ice Sex of test crab Hosts only Control P-value Male Female Total 7 6 13 7 4 11 Treatments were unconditioned control seawater and seawater con- ditioned with two Chaewplerus in tubes without any crab symbionts. P-values are from Chi-square tests with 1 an average Chaetopterus-vtsidQnl female would produce 8826 eggs per clutch. The results of the hosts-only experiments in
. The Biological bulletin. Biology; Zoology; Marine biology. HOST CHOICE IN A PEA CRAB 363 Einry choices <)/'Pinnixa chaetopterana Chaetopterus host-only experimenl from Amphitrite (() ihi Chamber cho ice Sex of test crab Hosts only Control P-value Male Female Total 7 6 13 7 4 11 Treatments were unconditioned control seawater and seawater con- ditioned with two Chaewplerus in tubes without any crab symbionts. P-values are from Chi-square tests with 1 an average Chaetopterus-vtsidQnl female would produce 8826 eggs per clutch. The results of the hosts-only experiments indicate that neither male nor female Pinnixa are attracted to odors emanating from Amphitrite or Chaetopterus in tubes without crabs (Tables II, III). The control and unoccupied Chaetopterus host treatments were therefore combined into a single category for statistical analysis in the host + competitor experiment. Results of the host + conspecific experiment show that male and female Pinnixa respond to odors from conspe- cifics resident in host tubes (Fig. 2). Crabs of both sexes significantly preferred the treatments in which conspecifics were present with the host. Crabs choosing this treatment were not significantly different in size from those choosing either of the other two treatments (ANOVA: = 2,38, MSE = , F = , P = ). Neither sex was sig- nificantly attracted to the hosts-alone treatment as com- pared to the control treatment (Fig. 2). The host + competitor experiment suggests that male and female Pinnixa respond somewhat differently to het- erospecific odor cues (Table IV). Male Pinnixa showed no discrimination between the three treatments, while fe- males show a strong tendency to avoid chambers con-. control wormsonly worms + crabs Treatment Chamber Chosen Figure 2. Percentages of Pinnixa chaetopterana responding to given treatments in the host + conspecifics experiment. Data are the averages of three trials. Error bars are one standard deviation. T
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