Table 1. Results from a Tukey’s HSD pairwise multiple comparisons test of mean potential microplastic (PMP) abundance across sponge species in R (R Development Core Team, 2019).

The six sponge species are Aplysina cauliformis, Amphimedon compressa, Callyspongia vaginalis, Ircinia campana, Mycale laevis and Niphates erecta and significant differences (p < 0.05) are boldfaced.

Pairwise comparison	Adjusted p-value
A. cauliformis - A. compressa	0.1269
A. cauliformis - C. vaginalis	0.9701
A. cauliformis - I. campana	0.9291
A. cauliformis - M. laevis	0.0360
A. cauliformis - N. erecta	0.8863
A. compressa - C. vaginalis	0.0365
A. compressa - I. campana	0.4709
A. compressa - M. laevis	0.9687
A. compressa - N. erecta	0.5416
C. vaginalis - I. campana	0.5608
C. vaginalis - M. laevis	0.0101
C. vaginalis - N. erecta	0.4893
I. campana - M. laevis	0.1661
I. campana - N. erecta	0.9999
M. laevis - N. erecta	0.2016