High occurrence of jellyfish predation by black-browed and Campbell albatross identified by DNA metabarcoding
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© 2017 John Wiley & Sons Ltd Gelatinous zooplankton are a large component of the animal biomass in all marine environments, but are considered to be uncommon in the diet of most marine top predators. However, the diets of key predator groups like seabirds have conventionally been assessed from stomach content analyses, which cannot detect most gelatinous prey. As marine top predators are used to identify changes in the overall species composition of marine ecosystems, such biases in dietary assessment may impact our detection of important ecosystem regime shifts. We investigated albatross diet using DNA metabarcoding of scats to assess the prevalence of gelatinous zooplankton consumption by two albatross species, one of which is used as an indicator species for ecosystem monitoring. Black-browed and Campbell albatross scats were collected from eight breeding colonies covering the circumpolar range of these birds over two consecutive breeding seasons. Fish was the main dietary item at most sites; however, cnidarian DNA, primarily from scyphozoan jellyfish, was present in 42% of samples overall and up to 80% of samples at some sites. Jellyfish was detected during all breeding stages and consumed by adults and chicks. Trawl fishery catches of jellyfish near the Falkland Islands indicate a similar frequency of jellyfish occurrence in albatross diets in years of high and low jellyfish availability, suggesting jellyfish consumption may be selective rather than opportunistic. Warmer oceans and overfishing of finfish are predicted to favour jellyfish population increases, and we demonstrate here that dietary DNA metabarcoding enables measurements of the contribution of gelatinous zooplankton to the diet of marine predators.
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McInnes, J.; Raymond, B.; Phillips, R.; Jarman, Simon; Lea, M.; Alderman, R. (2016)© 2016 International Council for the Exploration of the Sea 2016. All rights reserved. Many seabird populations are threatened by interactions with commercial fisheries, and climate change. Understanding their prey ...
Young, J.; Hunt, B.; Cook, T.; Llopiz, J.; Hazen, E.; Pethybridge, H.; Ceccarelli, D.; Lorrain, A.; Olson, R.; Allain, V.; Menkes, C.; Patterson, T.; Nicol, S.; Lehodey, P.; Kloser, Rudy; Arrizabalaga, H.; Anela Choy, C. (2015)© 2014 Elsevier Ltd.We review present understanding of the spatial and temporal diet variability (trophodynamics) of a range of pelagic marine top predators, at both early and adult life history stages. We begin with a ...
DNA metabarcoding as a marine conservation and management tool: A circumpolar examination of fishery discards in the diet of threatened albatrossesMcInnes, J.; Jarman, Simon; Lea, M.; Raymond, B.; Deagle, B.; Phillips, R.; Catry, P.; Stanworth, A.; Weimerskirch, H.; Kusch, A.; Gras, M.; Cherel, Y.; Maschette, D.; Alderman, R. (2017)© 2017 McInnes, Jarman, Lea, Raymond, Deagle, Phillips, Catry, Stanworth, Weimerskirch, Kusch, Gras, Cherel, Maschette and Alderman Almost all of the world's fisheries overlap spatially and temporally with foraging seabirds, ...