Table 3.

ANOSIM analysis and feeding groups responsible for average dissimilarities (A.D.) between the initial assemblage (I), the control one and those exposed to hydroxychloquine (HCQ1, HCQ2 and HCQ3) based on similarity percentages (SIMPER) analysis. More abundant (+); less abundant (−). Feeding groups accounting for about 50% of the overall dissimilarity between treatment pairs are ranked in order of importance of their contribution to this dissimilarity. Selective deposit-feeders (1A); non-selective deposit-feeders (1B); epistrate-feeders (2A), omnivores-carnivores (2B).

Comparisons	I vs. C	C vs. HCQ1	C vs. HCQ2	C vs. HCQ3
R statistics	−0.037	0.963	1	1
A.D. (%)	6.45	16.63	50.44	50.53
Feedfing groups	1A 29.36% (+) 1B 27.69% (+)	2B 46.23% (+) 2A 25.64% (−)	2B 35.41% (+) 2A 30.63% (−)	2A 33.02% (−) 2B 32.96% (+)