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Submitted by amdicicco on Tue, 12/04/2018 - 10:22

Ulva lactuca is an early colonist who has an effect on the later arriving Gigartina conaliculata. Figure 1 shows us that it is a facilitation relationship. Facilitation as a successional mechanism says that the early arriving species will make it less suitable for other early arrival species, but more suitable for late arriving species. This is seen in Figure 1 because when Ulva is present the number of Gigartina is much higher than it is when Ulva is removed.