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Stable isotope and mercury analyses of the Galápagos Islands seabird community
Citation
ZARN, A.M., VALLE, C.A., BRASSO, R., FETZNER, W. & EMSLIE, S.D. 2020. Stable isotope and mercury analyses of the Galápagos Islands seabird community. Marine Ornithology 48: 71 - 80
Received 07 March 2019, accepted 06 November 2019
Date Published: 2020/04/15
Date Online: 2019/03/30
Key words: foraging, δ15N, δ13C, mercury, ENSO events, tropical seabirds, dietary shifts
Abstract
The Galápagos Islands seabird community is directly impacted by El Niño Southern Oscillation (ENSO) cycles, which makes understanding seabird foraging behavior in response to these events important for future conservation plans. In this study, we used stable isotope analysis (δ15N and δ13C) to investigate trophic status and foraging location in the seabird community before, during, and after the 2015-2016 El Niño event. Mercury (Hg) analysis was also performed to provide a more thorough understanding of the relationship between contaminant exposure and foraging behavior. We analyzed breast feathers collected across five years (2011, 2014-2017) from eight nesting seabird species (Sula sula, S. granti, S. nebouxii excisa, Fregata minor, F. magnificens, Oceanodroma tethys tethys, Creagrus furcatus, and Phaethon aethereus)for δ15N and δ13C isotopes and total Hg (ppm). These sampling periods occurred at different points in the ENSO cycle, which allowed shifts in foraging behavior to be monitored as environmental conditions changed. Our findings indicate that higher Hg contamination is positively correlated with La Niña. Additionally, as prey abundance decreased with the onset of El Niño in 2015, most species showed more negative δ13C values, which indicates a shift to more pelagic foraging. Furthermore, isotopic nitrogen values revealed that while foraging by most species decreased in trophic level during the 2015-2016 El Niño, some populations, mainly Sula species, increased in trophic level. Both responses indicate a change in diet, suggestive of flexible foraging behavior.
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