a. Which treatment had the highest settlement of larvae? b. Which treatment(s) h

Question

a. Which treatment had the highest settlement of larvae?
b. Which treatment(s) had the lowest settlement of larvae?
c. Based on figure 1a and 1b only, does the density of bacterial cells explain the differences in larval settlement observed among treatments? Explain
d. Which bacterial species seems to deter settlement? 4. Dahms et al (2004) conducted controlled laboratory experiments to determine the influence of bacterial and diatom films on settlement of larvae of the Bryozoan Bugula neritina. Figure la below shows the settlement response of larvae to substrata treated with filtered seawater (FSW), a natural biofilm (NBF), and 3 strains of bacteria (C10, s8, and C16). (8pts) a. Which treatment(s) had the highest settlement of larvae? b. Which treatment(s) had the lowest settlement of larvae? c. Based on Figure la and Ib only, does the density of bacterial cells explain the differences in larval settlement observed among the treatments? Explain your answer. d. Which bacterial species seems to deter settlement? Figure 1 80 60 40 20 FSW NBF C10 S8 16 30 20 FSW NBF C10 S8 C16

Explanation / Answer

Answer

1. NBF has the higher settlement of larvae.
2. S8 has the lower settlement of larvae.
3. No, the density not have any relation to larval settlement. In FSW the density of bacteria almost nil but the settlement it is upto 80%. Meanwhile the highest settlement by NBF has higher density of bacteria.
4. S8

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