Table 1 Characteristics of MPs found in invasive crayfish from the scientific literature (ordered by year of publication).

From: Microplastics and invasive crayfish: emerging interactions and ecological implications from three coexisting species in a subalpine lake

Species

MPs abundance

MPs size

MPs shape

MPs color

MPs polymer

Identification method

Study site

Reference

P. clarkii

2.5 ± 0.6 items/ind.

< 1 mm

Fibers

White

PE, (PP)

µ-FTIR

Rice-Fish Co-culture, Shanghai, China

Lv et al., 201937

P. clarkii

0.17 ± 0.07–0.92 ± 0.19 items/ind.

50–100 μm

Fibers, fragments

Red, transparent, (Blue)

PE, PP: PE

µ-FTIR

Pond and Rice-Crayfish Co-culture, Hubei, China

Zhang et al., 202159

P. clarkii

0.86 ± 0.76 items/ind.; 0.06 ± 0.06 items/g (2021),

0.66 ± 0.76 items/ind.; 0.045 ± 0.06 items/g (2022)

134–1505 μm

Fibers, (fragments)

Black, white, (blue, light blue)

PP, PET

µ-FTIR

Lake Candia, Piedmont, Italy

Pastorino et al., 202319

P. leniusculus

16.1 ± 6.9 items/ind.; 23.0 ± 11.4 items/g

<5 mm (not specified)

Fibers, (fragments, films)

White, (black, blue, red, green, yellow, purple)

EP, PE, PEST

µ-FTIR

Watercourses within the Yorkshire Dales National Park, North Yorkshire, England

Dent et al., 202338

P. leniusculus

1–2 items/ind.

70–450 μm

Fibers, (fragments, films)

Black, (blue, red, pink, transparent)

PTFE, (PP, PE, PMMA, Cellophane, PA)

µ-FTIR

Wieprza River and its tributary, Poland

Dobrzycka-Krahel et al., 202460

F. cristavarius

0.4–2 items/g

1095 ± 391.2 μm

Fragments, (fibers)

White, (black)

PA, PVC, PP

µRaman

Stroubles Creek and Toms Creek, southwest Virginia, USA

Gray et al., 202458

F. limosus

0.37 ± 0.31 items/ind.; 6.13 ± 4.01 items/g

180–2450 μm

Fibers, (films)

Black, (orange, transparent, blue, Green)

PAK (PEST, PU)

µ-FTIR

Lake Maggiore, Piedmont, Italy

This study

P. clarkii

0.07 ± 0.06 items/ind.; 0.91 ± 0.79 items/g

220–610 μm

Fibers

Blue, pink

PAK, PEST

µ-FTIR

Lake Maggiore, Piedmont, Italy

This study

P. leniusculus

0.20 ± 0.10 items/ind.; 2.41 ± 1.07 items/g

160–1100 μm

Fibers, fragments

Blue, (light blue, black, Transparent, Yellow)

PEST (PE, PVC)

µ-FTIR

Lake Maggiore, Piedmont, Italy

This study

  1. Average abundance of microplastics ± stdev, size, shape, color, polymer, and study sites are reported (values in parentheses represent the least abundant).
  2. P. clarkii = Procambarus clarkii; P. leniusculus = Pacifastacus leniusculus; F. cristavarius = Faxonius cristavarius; F. limosus = Faxonius limosus. EP = epoxy resin; PA = polyamide; PAK = polyacrylate; PE = polyethylene; PEST = polyester; PET = polyethylene terephthalate; PP = polypropylene; PPMA = polymethyl methacrylate; PP: PE = poly (propylene-ethylene) copolymer; PTFE = polytetrafluoroethylene; PU = polyurethane; PVC = polyvinyl chloride.
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