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Documents disponibles écrits par cet auteur (14)
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Article
Daisuke Ochi, Auteur ; Nariko Oka, Auteur ; Yutaka Watanuki, AuteurThis study tested a hypothesis regarding behavioral coordination in breeding behavior of Streaked Shearwater Calonectris leucomelas: the “chick development hypothesis,” which posits that coordination enhances chick growth via improved provisioni[...]Nouveauté
Article
Sarara Azumi, Auteur ; Jean-Baptiste Thiebot, Auteur ; Akinori Takahashi, Auteur ; Jumpei Okado, Auteur ; Nao Nagatani, Auteur ; Yasuaki Niizuma, Auteur ; Masato Moteki, Auteur ; Yutaka Watanuki, AuteurShort-tailed shearwaters Ardenna tenuirostris are seasonally abundant consumers in the Southern Ocean, but their diet in this region is debated. Among birds found on vessels at high latitudes (n = 11 live birds and 4 carcasses), at least six had[...]
Article
Masayuki Senzaki, Auteur ; Akira Terui, Auteur ; Naoki Tomita, Auteur ; Fumio Sato, Auteur ; Yoshihiro Fukuda, Auteur ; Yoshihiro Kataoka, Auteur ; Yutaka Watanuki, AuteurGlobal seabird populations are in decline, with nearly half of all seabird species currently in an extinction crisis. Understanding long-term seabird population trends is an essential first step to inform conservation actions. In this study, we [...]
Article
Jean-Baptiste Thiebot, Auteur ; Bungo Nishizawa, Auteur ; Fumio Sato, Auteur ; Naoki Tomita, Auteur ; Yutaka Watanuki, AuteurIncidental capture in fisheries (“bycatch”) is a major threat to global marine biodiversity, especially to those species with low fecundity, such as albatrosses. Efforts to reduce bycatch have been undertaken in industrial fisheries, but the sca[...]
Article
Kentaro Kazama, Auteur ; Bungo Nishizawa, Auteur ; Shota Tsukamoto, Auteur ; Jordi E. Gonzalez, Auteur ; Mami T. Kazama, Auteur ; Yutaka Watanuki, AuteurSexual segregation in foraging habitats and associated diet differences have been reported in many seabirds. These sexual distinctions can be caused by differences in competitive ability or nutritional requirements. Here, we investigated the die[...]
Article
Masayuki Senzaki, Auteur ; Makoto Hasebe, Auteur ; Yoshihiro Kataoka, Auteur ; Yoshihiro Fukuda, Auteur ; Bungo Nishizawa, Auteur ; Yutaka Watanuki, AuteurThe Spectacled Guillemot (Cepphus carbo) is a seabird endemic to northeastern Asia. It is listed as a "Vulnerable" species in Japan, though little is known of its population status. Population surveys were carried out during 2011-2014 throughout[...]
Article
Yutaka Watanuki, Auteur ; Takashi Yamamoto, Auteur ; Ai Yamashita, Auteur ; Chihiro Ishii, Auteur ; Yoshinori Ikenaka, Auteur ; Shouta M. M. Nakayama, Auteur ; Mayumi Ishizuka, Auteur ; Yuya Suzuki, Auteur ; Yasuaki Niizuma, Auteur ; C. E. Meathrel, Auteur ; R. A. Phillips, AuteurWe measured mercury concentrations ([Hg]) and nitrogen stable isotope ratios (δ15N) in the primary feathers of Short-tailed Shearwaters (Puffinus tenuirostris) that were tracked year-round. The [Hg] were highest in 14 birds that used the Okhotsk[...]
Article
Fumi Hirose, Auteur ; Kentaro Kazama, Auteur ; Motohiro Ito, Auteur ; Yutaka Watanuki, AuteurIn some bird species, the survival of chicks hatching later in the season is lower than those hatched earlier due to increased risk of predation and a seasonal decline in feeding conditions. To reduce these risks, it might be advantageous for la[...]
Article
Maria I. Bogdanova, Auteur ; Sarah Wanless, Auteur ; Michael P. Harris, Auteur ; Jan Lindstroem, Auteur ; Adam Butler, Auteur ; Mark A. Newell, Auteur ; Katsufumi Sato, Auteur ; Yutaka Watanuki, Auteur ; Matt Parsons, Auteur ; Francis Daunt, AuteurMarine spatial planning aims to deliver sustainable use of marine resources by minimizing environmental impacts of human activities and designating Marine Protected Areas. This poses a challenge where species' distributions show spatio-temporal [...]
Article
Risa Sakai, Auteur ; Jumpei Okado, Auteur ; Aya Kumagai, Auteur ; Jean-Baptiste Thiebot, Auteur ; Yutaka Watanuki, AuteurWhen facing changes in the available forage fish composition and distribution, seabirds are expected to respond by switching their prey species and/or adjusting their key foraging areas. We studied chick-rearing Rhinoceros Auklets Cerorhinca mon[...]
Article
Kentaro Kazama, Auteur ; Kazuhiko Hirata, Auteur ; Takashi Yamamoto, Auteur ; Hiroshi Hashimoto, Auteur ; Akinori Takahashi, Auteur ; Yasuaki Niizuma, Auteur ; Philip N. Trathan, Auteur ; Yutaka Watanuki, AuteurLong-lived animals sometimes skip one or more breeding seasons; however, little is known about their movements and activities during such sabbatical' periods. Here we present novel data on year-round movements and activities of two male black-ta[...]
Article
Chris B. Thaxter, Auteur ; Francis Daunt, Auteur ; Keith C. Hamer, Auteur ; Yutaka Watanuki, Auteur ; Mike P. Harris, Auteur ; David Grémillet, Auteur ; Gerrit Peters, Auteur ; Sarah Wanless, AuteurSexual differences in food provisioning rates of monomorphic seabirds are well known but poorly understood. Here, we address three hypotheses that attempt to explain female-biased food provisioning in common guillemots Uria aalge: (1) males spen[...]
Article
Dale M. Kikuchi, Auteur ; Yutaka Watanuki, Auteur ; Nobuhiko Sato, Auteur ; Kenji Hoshina, Auteur ; Akinori Takahashi, Auteur ; Yuuki Y. Watanabe, AuteurAlcids propel themselves by flapping wings in air and water that have vastly different densities. We hypothesized that alcids change wing kinematics and maintain Strouhal numbers (St = fA/U, where f is wingbeat frequency, A is the wingbeat ampli[...]
Article
Yutaka Watanuki, Auteur ; Akinori Takahashi, Auteur ; Francis Daunt, Auteur ; Katsufumi Sato, Auteur ; Nobuyuki Miyazaki, Auteur ; Sarah Wanless, AuteurThe first underwater digital photographs obtained by cameras carried by Shags Phalacrocorax aristotelis showed the birds diving in areas dominated by soft coral Alcyonium digitatum and feeding on butterfish Pholis gunnellus, which were brought t[...]
