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Comparing the metallic elemental compositions of Kelp Gull Larus dominicanus eggs and eggshells from the Swartkops Estuary, Port Elizabeth, South Africa
North West University, South Africa.
North West University, South Africa.
Nelson Mandela University, South Africa.
North West University, South Africa.
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2019 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 221, p. 533-542Article in journal (Refereed) Published
Abstract [en]

Metals attributed to pollution may increase their concentrations above the geological background and pose toxic challenges towards humans and biota. We analysed sixteen Kelp Gull eggs and eggshells for 30 metallic elements from the Swartkops Estuary (SE), an important recreational, industrial, and ecological asset for Port Elizabeth, the region, and South Africa. Mean concentrations for eggshell and egg content for Hg was 0.02 and 0.4 mg/kg dm, Cr was 4 and 18 mg/kg dm (the highest yet recorded for any gull or tern egg), for Zn 2.1 and 62 mg/kg dm, for Sr 880 and 12 mg/kg dm, for V 170 and 1.3 mg/kg dm, and for Co 1.7 and 0.002 mg/kg dm, respectively. Zink, Se, and Hg, increased on a dry-mass basis from sediment via small fish to gull egg content, indicating bioaccumulation. No effect on eggshell thickness was seen. We also determined that eggshell concentrations cannot be used as a proxy for egg content concentrations. Mercury, Cr, V, Co, and Zn were elements we identified as potentially problematic that require source identification and mitigation. Further research into other high-trophic animals such as herons, egrets, cormorants, and otters in the SE system is proposed.

Place, publisher, year, edition, pages
2019. Vol. 221, p. 533-542
Keywords [en]
Ecotoxicology, heavy metals, gull egg physiology, Indian Ocean
National Category
Environmental Sciences Ecology Zoology Occupational Health and Environmental Health Other Chemistry Topics
Identifiers
URN: urn:nbn:se:liu:diva-153893DOI: 10.1016/j.chemosphere.2019.01.013ISI: 000460710700060PubMedID: 30660910OAI: oai:DiVA.org:liu-153893DiVA, id: diva2:1279922
Note

Funding agencies: National Research Foundation (NRF) [93977]

Available from: 2019-01-17 Created: 2019-01-17 Last updated: 2019-04-01

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The full text will be freely available from 2021-01-07 12:13
Available from 2021-01-07 12:13

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Kylin, Henrik

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