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Quantifying impacts of plastic debris on marine wildlife identifies ecological breakpoints

Marn, Nina; Jusup, Marko; Kooijman, Sebastiaan A. L. M.; Klanjšček, Tin (2020) Quantifying impacts of plastic debris on marine wildlife identifies ecological breakpoints. Ecology Letters, 23 (10). pp. 1479-1487. ISSN 1461-023X

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Quantifying sublethal effects of plastics ingestion on marine wildlife is difficult, but key to understanding the ontogeny and population dynamics of affected species. We developed a method that overcomes the difficulties by modelling individual ontogeny under reduced energy intake and expenditure caused by debris ingestion. The predicted ontogeny is combined with a population dynamics model to identify ecological breakpoints: cessation of reproduction or negative population growth. Exemplifying this approach on loggerhead turtles, we find that between 3% and 25% of plastics in digestive contents causes a 2.5–20% reduction in perceived food abundance and total available energy, resulting in a 10–15% lower condition index and 10% to 88% lower total seasonal reproductive output compared to unaffected turtles. The reported plastics ingestion is insufficient to impede sexual maturation, but population declines are possible. The method is readily applicable to other species impacted by debris ingestion.

Item Type: Article
Uncontrolled Keywords: Physiological energetics ; Conservation ; Sea turtles ; Stressors ; Debris ingestion
NATURAL SCIENCES > Interdisciplinary Natural Sciences
Divisions: Division for Marine and Enviromental Research
Project titleProject leaderProject codeProject type
Prilagodba uzgoja bijele ribe klimatskim promjenama-AqADAPTTin KlanjščekIP-2018-01-3150HRZZ
Depositing User: Nina Marn
Date Deposited: 17 Nov 2021 08:47
DOI: 10.1111/ele.13574

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