The effect of different organic-rich sewage concentration (0%, 20% and 60% diluted in
seawater) and absence or presence of mangrove trees on the survival, bioturbation activities
and burrow morphology of fiddler crabs species was assessed. After 6months, males of both
species always showed higher survival (∼ 80%) when compared to females (∼ 20%).
Crabs inhabiting pristine conditions achieved higher survival (67–87%) than those living in
sewage-exposed mesocosms (40–71%). At 60% sewage loading, fiddler crabs processed ...