Recruitment, growth and mortality of an Antarctic hexactinellid sponge, Anoxycalyx joubini.
Polar ecosystems are sensitive to boots climate forcing, and we often lack baselines to evaluate changes.Here we report a nearly 50-year study in which a sudden shift in the population dynamics of an ecologically important, structure-forming hexactinellid sponge, Anoxycalyx joubini was observed.This is the largest Antarctic sponge, with individuals