INTERPRET THE DATA After examining Figure 40.13, you decide to study feeding relationships among sea otters, sea urchins, and kelp. You know that sea otters prey on sea urchins and that urchins eat kelp. At four coastal sites, you measure kelp abundance. Then you spend one day at each site and mark whether otters are present or absent every 5 minutes during the day. Graph kelp abundance (on the y-axis) versus otter density (on the x-axis), using the data below. Then formulate a hypothesis to explain the pattern you observed.
Site | Otter Density (# sightings per day) |
Kelp Abundance (% cover) |
1 | 98 | 75 |
2 | 18 | 15 |
3 | 85 | 60 |
4 | 36 | 25 |
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