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Spatial variation of plastic debris on important turtle nesting beaches of the remote Chagos Archipelago, Indian Ocean

V. Hoare, N. Atchison Balmond, G.C. Hays, R. Jones, H. Koldewey, J.-O. Laloë, E. Levy, F. Llewellyn, H. Morrall, Nicole Esteban Orcid Logo

Marine Pollution Bulletin, Volume: 181, Start page: 113868

Swansea University Author: Nicole Esteban Orcid Logo

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DOI (Published version): 10.1016/j.marpolbul.2022.113868

Abstract

We report Anthropogenic Marine Debris (AMD) in Chagos Archipelago in the Indian Ocean, globally amongst the most isolated island groups. AMD on 14 island beaches in five atolls were surveyed in 2019 using two techniques: Marine Debris Tracker (MDT) along littoral vegetation and photoquadrats in open...

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Published in: Marine Pollution Bulletin
ISSN: 0025-326X
Published: Elsevier BV 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa60396
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Abstract: We report Anthropogenic Marine Debris (AMD) in Chagos Archipelago in the Indian Ocean, globally amongst the most isolated island groups. AMD on 14 island beaches in five atolls were surveyed in 2019 using two techniques: Marine Debris Tracker (MDT) along littoral vegetation and photoquadrats in open beach. Over 60 % of AMD in both beach zones was composed of plastics, especially bottles and fragments (mean = 44.9 %, 27.2 %, range = 16.5–73.2 %, 4.8–55.9 % respectively in vegetation; mean = 28.7 %, 31.5 %, range = 17.7–40.7 %, 11.6–60.0 % respectively in open beach). The density of plastic debris in littoral vegetation (MDT data: 1995 bottles, 3328 fragments per 100 m2) was 10-fold greater than in open beach (photoquadrat data: 184 bottles, 106 fragments per 100 m2). Significant latitudinal variation in vegetation AMD occurred (8-fold greater in southern atolls, p = 0.006). AMD varied within island zones: most debris observed on oceanside beaches (oceanside vs lagoon, W = 365, p < 0.001; ocean vs island tip, W = 107, p = 0.034). Standardisation of surveys using the open-source MDT App is recommended. Debris accumulation hotspots overlapped with sea turtle nesting habitat, guiding future beach clean-up prioritisation.
Item Description: Data availability:Data will be made available on request.
Keywords: Marine pollution; Coastal management; Marine turtle conservation; Coral reef atoll; Litter management; Beach clean
College: Faculty of Science and Engineering
Funders: Bertarelli Foundation; BPMS-2017-4; DEFRA; Darwin Plus grant DPLUS090
Start Page: 113868

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