Prey Resources used for Producing Egg Yolks in Four Species of Seabirds: Insight from Stable-Isotope Ratios

Motohiro Ito; Kentaro Kazama; Yasuaki Niizuma; Hiroshi Minami; Yuzan Tanaka; Yutaka Watanuki

doi:10.2326/osj.11.113

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Motohiro Ito,^1,* Kentaro Kazama,² Yasuaki Niizuma,² Hiroshi Minami,³ Yuzan Tanaka,⁴ Yutaka Watanuki⁴

¹1National Institute of Polar Research, 10-3Midori-cho, Tachikawa, Tokyo 190-8518, Japan
²2Laboratory of Environmental Zoology, Faculty of Agriculture, Meijo University, 1-501 Shiogamaguchi,
³3National Research Institute of Far Seas Fisheries, 5- 7-1 Shimizu, Shizuoka 424-8633, Japan
⁴4Graduate School of Fisheries Sciences, Hokkaido University, 3-1-1 Minato, Hakodate, Hokkaido 041-86

^*Corresponding author, E-mail: ito.motohiro@nipr.ac.jp

Abstract

Carbon and nitrogen stable-isotope ratios were measured in the egg yolks of four species of seabirds in Teuri Island and Rishiri Island, Japan. Delta ¹⁵N of the yolks of Rhinoceros Auklets Cerorhinca monocerata (11.2– 12.3‰) and Black-tailed Gulls Larus crassirostris (11.3 –12.5‰) were lower than those of Slaty-backed Gulls Larus schistisagus (13.4–14.2‰) and Japanese Cormorants Phalacrocorax capillatus (14.0–16.2‰); suggesting that the former two species foraged mainly on low trophic level small fishes and sometimes on krill, while the latter two species fed on higher trophic level prey and larger fishes.

Citation Download Citation

Motohiro Ito, Kentaro Kazama, Yasuaki Niizuma, Hiroshi Minami, Yuzan Tanaka, and Yutaka Watanuki "Prey Resources used for Producing Egg Yolks in Four Species of Seabirds: Insight from Stable-Isotope Ratios," Ornithological Science 11(2), 113-119, (1 December 2012). https://doi.org/10.2326/osj.11.113

Received: 28 November 2011; Accepted: 11 September 2012; Published: 1 December 2012

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