Here there is a mix of two distinct concepts: modularity and connectance. I'd suggest saying: "A module is a group of species that preferentially interact with each other instead of species outside the module. In Figure 1B, each module is represented by a distinct color.

Connectance measures the proportion of interactions taking place in a network out of the total amount of possible interactions. The low connectance observed means that not all possible interactions actually occur in the ecosystem."

Metaphorically, nestedness can be compared to a Russian doll, where the diet of specialist species (smaller dolls) fits within the diet of the more generalist species (larger dolls).

Local scales (specific sites) and regional scales (entire regions, like an island or an archipelago)

Correct to "The graph depicts the rewiring as a black bar, representing the portion of the interaction dissimilarity which was due to different interactions between the two sites despite both areas having the same species of plants and animals.

Replace by "When specialist species interact with one (or a few) of the same species that the generalists interact with, it generates a nested organization of the interactions. Metaphorically, nestedness can be compared to a Russian Doll, where the diet of specialist species (smaller dolls) fit within the diet of the more generalists species (larger dolls). In Figure 1A, the specialists species are depicted as very thin rectangles to represent the few interactions they have with other species, whereas the generalist species are bigger rectangles to encompass the many interactions they have with other species."

In ecology, dispersal has another meaning. Please replace by "dispersal"

Of all seeds found on bird poops, 93% are of introduced plant species

process of assisting the recovery of an ecosystem that has been degraded, damaged or destroyed

ability to establish new interactions with partner species present in the ecosystem