With or without upwelling the copepoda Paracalanus quasimodo is present in high abundance in Cabo Frio. What would happen if this species was lost in the region, would the second most abundant species (Temora turbinata) take its place? Both preferentially herbivorous and highly related to the phytoplankton peaks present all year round.
It's a possibility, since they both coexist but Paracalanus quasimodo seems to have a regulating role in the occurence of Temora turbinata (probably because the first one is a better competitor or there are a super little difference in their niches that favors the most abundant species, among other factors), however it will depend also in the absence of changes in Temora turbinata niche, mainly regarding predation interactions and resources... Assuming there won't be a natural predator for Temora turbinata (in case of the lost of Paracalanus quasimodo) and no changes in its resource amount, for exemple, this species may be expected to become the most abundant one. Despite that, I think that a (natural) factor strong enough to cause the lost of Paracalanus quasimodo may also cause the lost of Temora turbinata, since they're so alike :)
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