Table 5. Trophic niche breadth of sea urchins without Sargassum effect (WSE) and under Sargassum effect (USE) at Mahahual, Xahuayxol and Xcalak calculated by SIBER analysis of muscle values.

SEAc, corrected standard ellipse area.

Niche breadth	Mahahual		Xahuayxol		Xcalak
	WSE	USE	WSE	USE	WSE	USE
SEA	0.62	0.71	1.79	2.97	2.32	2.32
SEAc	0.83	0.89	2.68	3.57	3.48	0.14