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Breeding eider ducks strongly influence subarctic coastal pond chemistry


Arctic freshwater ponds are typically pristine and oligotrophic, however seabird biovectors can markedly alter water quality via enrichment with marine-derived nutrients and bioaccumulated metals. These ornithogenic inputs can be the dominant factor structuring aquatic biota and the surrounding island flora. Here, we measured a suite of limnological water chemistry variables and sediment geochemistry from 21 freshwater ponds influenced by Common Eiders (Somateria mollissima) in Hudson Strait, near the northern communities of Cape Dorset (Nunavut) and Ivujivik (Quebec). Nest counts and sedimentary δ15N values were used as proxies of bird abundance. Nutrient-rich guano from the nesting eiders visibly promoted the growth of catchment vegetation. Elevated metal (Al, Cd, Zn), metalloid (Se), and nutrient concentrations (N, P) in the water of eider-affected sites were recorded (Sign test; p = 0.004), but the proximity of many sites to the coast meant that variables related to ocean spray (conductivity, Na+, Mg2+, Cl, Sr) confounded the effects of birds on pond water chemistry. In contrast, sediment geochemistry appeared to more clearly characterize sites according to the level of eider activity in their catchments by tracking Pb, Cd, N, and P sedimentary concentrations (Sign test; p = 0.02). These results have direct implications for reconstructing historical eider population trends using sediment archives, which is necessary to inform effective conservation management strategies.

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Thank you to Michael Janssen and Jake Russell-Mercier (Wildlife Research Division, ECCC) for logistical support. Thank you to the Aiviq Hunters and Trappers Organizations’ and Ivujivik Hunters and Trappers Association for their support in our research. We especially thank Xiaowa Wang for her careful attention to the water samples. This research was funded by Environment and Climate Change Canada, the W. Garfield Weston Foundation, the Natural Sciences and Engineering Research Council of Canada (NSERC), the Pew Charitable Trusts, the Nunavut General Monitoring Plan (NGMP), and ArcticNet Network Centres of Excellence Canada. Finally, thank you to two anonymous reviewers for their very helpful feedback and comments.

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Correspondence to Matthew P. Duda.

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Duda, M.P., Hargan, K.E., Michelutti, N. et al. Breeding eider ducks strongly influence subarctic coastal pond chemistry. Aquat Sci 80, 40 (2018).

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  • Ornitholimnology
  • Biovector
  • Common Eider
  • Arctic
  • Nutrients
  • Metals