Q7. Based on the results above, you study the settlement patterns of the three s

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Q7. Based on the results above, you study the settlement patterns of the three species. You establish transects on each of your experimental rock-faces (which are evenly distributed among the upper, middle and lower intertidal zones) and remove all barnacles. Each day, you count the number of individuals of each species present in each transect, then remove them. You do this for 30 days. Based on your results inthe table below what can you conclude? Average and range of settlement rate (individuals/day in three intertidal zones Species Zone 0 Upper Intertidal 30 (20-25) 31 (20-35) Middle Intertidal 30 (21-36) 32 (20-36) 30 (20-35) Lower Intertidal 28 (19-36) 29 (18-34) 31 (23-35) O Competition between Species A and B is more likely than differences in physical adaptations to explain the distributions of those two species in the upper and middle intertidal zone. Differences in physical adaptations are likely more important than competition in explaining the distributions of Species A and B in the upper and middle intertidal zones. Species A and B outcompete Species C in the upper intertidal zone Species C is better adapted to the physical environment of the lower intert zone than are the other two species

Explanation / Answer

No.7:
when no water reached any barnacles for several days, desiccation became a real threat to the barnacles’ survival. During this time, species C suffered a high mortality rate . At the same time, species A and B suffered a less mortatlity compared to species A. Clearly, species C is not as resistant to desiccation as species A and B and could not survive in the upper intertidal zone where species A and B occurs.While the potential distribution (the fundamental niche, of Species A and B extends over the entire intertidal zone, their actual distribution (the realized niche) is restricted to the upper zone. In a natural environment, one species can actually outcompete another and affect its distribution within a habitat

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