The boom-bust dynamic of the invader Boccardia proboscidea mediated by sewage discharge: the response of the intertidal epilithic community in the Southwest Atlantic

LLANOS EN; SARACHO BOTTERO MA; JAUBET ML; GARAFFO GV; HINES E; CUELLO GV; ELÍAS R

MARINE POLLUTION BULLETIN

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2021

0025-326X

Biological invasions produce an invader population boom but areoften followed by an invader population bust. The decrease of the invaderabundance ends with the coexistence of native species and the invader orwith repeated boom and bust events. In the Southwest Atlantic, thepolychaete Boccardia proboscidea invaded the coasts influenced bydomestic discharges. We studied the change in the intertidal benthiccommunity during the boom-bust dynamic of the B. proboscidea invasion.During the boom, the invader polychaete was dominant. Species richness,diversity, and evenness indices decrease in the boom phase. During thebust of the B. proboscidea invasion, the decrease of organic matterallowed B. rodriguezii to coexist with B. proboscidea. Beta diversitycomparing boom with the bust phase showed a greater nesting (nestednesscomponent); reflecting a process of species loss. We found that bothboom and bust phases of the polychaete B. proboscidea invasion weremediated by sewage.