TABLE 3 |.

Microplastic content in feces from 8 pinniped species and 1 odontocete species (in grey).

Location	Species	n	No of microplastics	Size	Shape	Color	Polymer type	Ref
Atlantic Ocean (Cornish Seal sanctuary and Massachusetts)	Halichoerus Grypus ^	31 from 4 resident seals	48% of scats contained microplastics. Ranging 0 to 4 particles/scat.a	Fragments size from 0.4 × 0.3 mm to 5.5 × 0.4 mm. Fibers from 0.6 to 3.5 mm	Fragments (69%) and fibers (31%)	Black (27%), transparent and red (23% both), blue (15%), and orange (12%)	EP (27%), PP (27%), PE (12%). Other polymers were also found	Nelms et al.(2018)
	Phoca vitulina vitulina	32	2 fragments in 32 scats	Size ranged 1.2 to 3.5 mm	Fragments	Tan, red, purple and white	Alkyd resin (1), celophane (2), EPDM rubber(1)	Hudak et al.(2019)
	Halichoerus grypus atlantica	129	2 fragments in 129 scats
Pacific Ocean (Australia, Alaska, California, Peru, Chile)	Arctocephalus tropicalis Arctocephalus gazella	145	164 plastic items in total. Mean 1.13 particle/scat*	Mean length 4.1 mm. Mean width 1.9 mm. Range 2 mm to 5 mm	Most were fragments with irregular shapes	White, brown, blue green and yellow were most common	PE 93%, PP 4% Other polymers were found	Erisksson and Burton (2003)
	Callorhinus ursinus	44	398 fragments and 186 fibers in total. 9.05 fragments/scat and 4.22 fibers/scat	82% of microplastics below 1 mm and 72% fibers below 2 mm	Fragments and fibers. Fibers were also present in the laboratory blanks and sediment samples	Fragments were white. Fibers were black, white, purple, blue, red, yellow and clear	Fragments were low density PE. Only two fragments tested and fibers were NA.	Donohue et al.(2019)
	Arctocephalus australis	50	8.84 ± 11.01 fibers/scat and 1.5 ± 5.78 fragments/scat*	NA	Fibers more abundant. Fragments were also present	Most abundant. color was blue and white	81.5% of fragments or fibers were anthropogenic in origin. 51.5% were cotton and 30% were polymers (PET and PA), the rest did not match any spectra	Perez-Venegas et al. (2020)
	Arctocephalus philippii	40	29.75 ± 49.1 fibers/scat and 1.5 ± 6.36 fragments/scat*
	Otaria byronia	14	75.57 ± 81.46 fibers/scat and 1.28 ± 4.8 fragments/scat*
		12	23.08 ± 16.18 fibers/scat and 1.25 ± 3.1 fragments/scat*
		10	29.2 ± 26 fibers/ scat and 0.4 ± 1.26 fragments/scat*
	Arctocephalus australis	79	23.97 ± 34 fibers/scat and 0.16 ± 1.46 fragments/scat*
	Arctocephalus australis	51	Microfibers in 67% of examined samples. Ranging from 0 to 180/scat	>0.1 mm	Microfibers	Blue (45%), white (24%), black(16%), red (15%)	NA	Perez-Venegas et al. (2018)
Arctic Ocean (Canada)	Delphinapterus leucas a	2	2 and 0 items	Range was 0–5 mm. Most were <1 mm	Fragments (51%) and fibres (49%)	NA	Most abundant 44% PES (85% fibres). Others: PVC, PO, PA, acrylic, PP, PS, PE.	Moore et al.(2020)

^*calculated from data in the paper.

^{^}Seals from Cornish Seal Sanctuary, UK ^a results are outcomes from GI tract and feces content

^asubsample analyzed. Abbreviations: Polyethylene PE, Ethylene propylene EP, Polyester PET, Polypropylene PP, Polystyrene PS, Polyamide (nylon) PA, Polyvinyl chloride PVC, poly(ethylene:prolypene:diene) EPDM, Polyolefin PO.