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. 2020 Apr 20;27(18):22380–22389. doi: 10.1007/s11356-020-08790-5

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© The Author(s) 2020

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Fig. 2 — Lepidostoma basale cases. a Typical field-collected original case. b Portable case built from sand under laboratory conditions (treatment: ‘only sand’). c Portable case built from sand and black PVC particles under laboratory conditions (treatment: ‘PVC hc’). d Portable case built from sand and blue PET particles under laboratory conditions (treatment: ‘PET lc’)