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Albatross-borne loggers show feeding on deep-sea squids: implications for the study of squid distributions

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/73339

Title: Albatross-borne loggers show feeding on deep-sea squids: implications for the study of squid distributions
Authors: Nishizawa, Bungo Browse this author
Sugawara, Takanori Browse this author
Young, Lindsay C. Browse this author
Vanderwerf, Eric A. Browse this author
Yoda, Ken Browse this author
Watanuki, Yutaka Browse this author →KAKEN DB
Keywords: Phoebastria immutabilis
GPS-logger
Camera-logger
Taningia danae
Onykia robusta
Hawaiian Islands
Area-restricted search
Issue Date: 29-Mar-2018
Publisher: Inter-Research
Journal Title: Marine ecology progress series
Volume: 592
Start Page: 257
End Page: 265
Publisher DOI: 10.3354/meps12482
Abstract: How surface-feeding albatrosses feed on deep-sea squids has long been a mystery. We investigated foraging behavior during daylight hours of 20 Laysan albatrosses Phoebastria immutabilis breeding in Hawaii using GPS- and camera-loggers. The birds traveled to the North Pacific Transition Zone up to 600 km north of their breeding site. The camera images showed that Laysan albatrosses fed on large (~ 1 m body length), intact floating dead squids (6 events) and floating fragmented squids (10 events) over deep oceanic water (>2000 m) while they flew in a straight path without sinuous searching. Feeding events on squids were not observed during trips when fishing vessels were photographed and seemed to be distributed randomly and sparsely. Thus, this study suggests that Laysan albatrosses found large, presumably post-spawning, squids opportunistically while they were traveling during daylight hours. Although we did not find cetaceans in our surface pictures, we could not rule out the possibility that birds fed on squids, especially fragmented specimens, in the regurgitates of cetaceans at depth. This study demonstrates the usefulness of combining animal-borne GPS- and camera-loggers on wide-ranging top predators for studying the distribution of little known deep-sea squids and their importance in the diet of marine top predators.
Type: article (author version)
URI: http://hdl.handle.net/2115/73339
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 西澤 文吾

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