【摘 要】
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Seabirds have substantial influence on geochemical circulation of elements, serving as a link for substance exchange between their foraging area and colonies.In this study, we investigated the element
【机 构】
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Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Techno
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Seabirds have substantial influence on geochemical circulation of elements, serving as a link for substance exchange between their foraging area and colonies.In this study, we investigated the elemental and carbon isotopic composition of five penguin-affected sediment profiles excavated from Ross Island and Beaufort Island in the Ross Sea region, East Antarctica.Among the three main constituents of the sediments (including soil, guano and algae), guano was the main source of organic matter and nutrients, causing selective enrichment of several elements in each of the sediment profiles.In the 22 measured elements, S, Se, As, P, Cu, Zn, and Cd were identified as penguin bio-elements in the Ross Sea region through statistical analysis and comparison with local end-member environmental media such as weathered soil, fresh guano and fresh algae.Carbon isotopic composition in the ornithogenic soils showed a mixing feature of guano and algae.Using a 2-member isotope mixing equation, we were able to reconstruct the historical change of guano input and algal bio-mass.Compared with research in other parts of the Antarctic, Arctic, and South China Sea, we found apparent overlap of avian bio-elements including Se, As, Cu, Zn, Cd, and P in our study.Information on the composition and behavior of bio-elements in seabird guano on a global scale, and the role that bio-vectors play in the geochemical circulation between land and sea will facilitate future research on avian ecology and palaeoclimatic reconstruction.
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