Alien corals in a Brazilian seaport and perspectives for improving marine bioinvasion detection and management in commercial ports

Abstract

Two invasive coral species, Tubastraea coccinea and T. tagusensis, were identified on underwater artificial structures during a routine inspection at the Port of São Sebastião in southwestern Brazil in 2019. Both species were previously recorded in natural and artificial substrata in the region since 2008, including marine protected areas, but never found in the Port area. Tubastraea spp. are highly invasive species that outcompete native and endemic species, trigger seascapes changes, and modify ecosystem functions. Although it is uncertain if the São Sebastião Port was the primary source of these bioinvasion, ports' activity might enhance secondary dispersion, collaborating to spread the invasive species. This finding triggered a request by the Brazilian Institute of Environment (IBAMA) to the implementation of a specific plan to control the Tubastraea invasion attached to the invasive species monitoring program, which was one of the conditions to renew the operation license of the São Sebastião Port in 2020. Here, we recommend that commercial seaports consider including biota monitoring programs focusing on detecting marine non-indigenous species. Furthermore, we provided some subjects that should be incorporated in monitoring programs and highlight the need for evaluation of underwater artificial structures additionally to adjacent rocky shores. If a potentially invasive species is detected, a specific plan to control the invaders should be developed, as well as strategies to control invasive species dispersion. The monitoring program should be planned under the guidance of environmental agencies and incorporate the scientific community and general society, stimulating partnerships and discussions focusing on better understanding biological invasions in seaports and improving their management.