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Plastic debris increases circadian temperature extremes in beach sediments

Lavers, JL ORCID: 0000-0001-7596-6588, Rivers-Auty, J ORCID: 0000-0001-5321-2347 and Bond, AL 2021 , 'Plastic debris increases circadian temperature extremes in beach sediments' , Journal of Hazardous Materials, vol. 416 , pp. 1-7 , doi: 10.1016/j.jhazmat.2021.126140.

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Plastic pollution is the focus of substantial scientific and public interest, leading many to believe the issue is well documented and managed, with effective mitigation in place. However, many aspects are poorly understood, including fundamental questions relating to the scope and severity of impacts (e.g., demographic consequences at the population level). Plastics accumulate in significant quantities on beaches globally, yet the consequences for these terrestrial environments are largely unknown. Using real world, in situ measurements of circadian thermal fluctuations of beach sediment on Henderson Island and Cocos (Keeling) Islands, we demonstrate that plastics increase circadian temperature extremes. Particular plastic levels were associated with increases in daily maximum temperatures of 2.45ºC and decreases of daily minimum by -1.50ºC at 5 cm depth below the accumulated plastic. Mass of surface plastic was high on both islands (Henderson: 571 ± 197 g/m2; Cocos: 3164 ± 1989 g/m2), but did not affect thermal conductivity, specific heat capacity, thermal diffusivity, or moisture content of beach sediments. Therefore, we suggest plastic effects sediment temperatures by altering thermal inputs and outputs (e.g., infrared radiation absorption). The resulting circadian temperature fluctuations have potentially significant implications for terrestrial ectotherms, many of which have narrow thermal tolerance limits and are functionally important in beach habitats.

Item Type: Article
Authors/Creators:Lavers, JL and Rivers-Auty, J and Bond, AL
Keywords: marine debris, plastic pollution, remote island, sediment properties, temperature gradient, South Pacific, Indian Ocean
Journal or Publication Title: Journal of Hazardous Materials
Publisher: Elsevier Science Bv
ISSN: 0304-3894
DOI / ID Number: 10.1016/j.jhazmat.2021.126140
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Copyright 2021 Elsevier B.V. All rights reserved.

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