Sayaka Horie

Osaka City University

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Masaoki Takagi

Hokkaido University

Kana Akatani

Osaka City University

Shin Matsui

Tokai University

Kyoko Sawabe

National Institute of Infectious Diseases

Yoshio Tsuda

National Institute of Infectious Diseases

Koichi Murata

Kyoto University

Emi Sasaki

Louisiana State University

Yukita Sato

Nihon University

Hiroko Ejiri

National Institute of Infectious Diseases

Yoshio Okahata

Tokyo Institute of Technology

Cooperative Institutions

Nihon University

Tokyo Institute of Technology

National Institute of Infectious Diseases

Japan Science and Technology Agency

Hokkaido University

Osaka City University

Tokai University

St. Marianna University School of Medicine

Nagasaki University

National Institute for Japanese Language and Linguistics

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Nest positioning by male Daito White‐eyes Zosterops japonicus daitoensis improves with age to reduce nest predation risk

Ibis (2012)

Sayaka Horie Masaoki Takagi

Age‐related improvement in reproductive success is widely observed in birds, and the mechanisms by which productivity is enhanced have received considerable attention. However, little is known about how parental age affects the loss of eggs or nestlings despite the fact that age effects on nesting success are often reported. We examined parental age effects on reproductive success in relation to the avoidance of nest predation in an island subspecies of the Japanese White‐eye, the Daito White‐eye Zosterops japonicus daitoensis . Clutch size and annual number of breeding attempts did not differ between parental age classes. Reproductive success was affected only by male age through an increase in nesting success. Nest failure was attributed only to predation in this species and nest concealment and nest height were important nest characteristics promoting successful fledging. Older males built their nests in more concealed and higher positions than first‐year birds, regardless of vegetation status around the nest. Analysis of individual birds suggested that by shifting the nest to a safer position, male White‐eyes achieved higher nesting success than in the previous year. Of three hypotheses of age‐related improvement in reproductive success considered, our data favoured the hypothesis that as individuals grow older, their breeding competence improves.

Fledge

Avian clutch size

10.1111/j.1474-919x.2011.01204.x

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Citations (13)

Avian Haemosporidian Parasites Infection in Wild Birds Inhabiting Minami-Daito Island of the Northwest Pacific, Japan

Journal of Veterinary Medical Science (2008)

Koichi Murata Ryosuke NII Saori Yui Emi Sasaki Satoshi Ishikawa

Haemosporidian parasites infection among wild birds inhabiting Minami-daito Island was studied. Blood films from 183 birds representing 4 species of 4 families were examined microscopically. Avian haemosporidian parasites were detected in 3 species with an overall prevalence of 59.6%. None of the 30 Daito scops owls (Otus scops interpositus) examined were infected. Either Haemoproteus sp. or Plasmodium sp. infection was found in 14 of 31 (45.2%) Borodino islands white-eyes (Zosterops japonicus daitoensis). Plasmodium spp. were found in 94 of 102 (92.2%) bull-headed shrikes (Lanius bucephalus) and 1 of 20 (5%) tree sparrows (Passer montanus).

Haemoproteus

Plasmodium (life cycle)

10.1292/jvms.70.501

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Detection of Avian Plasmodium spp. DNA Sequences from Mosquitoes Captured in Minami Daito Island of Japan

Journal of Veterinary Medical Science (2008)

Hiroko Ejiri Yukita Sato Emi Sasaki Daisuke SUMIYAMA Yoshio Tsuda

Several species of birds in Minami Daito Island, an oceanic island located in the far south from the main islands of Japan, were found to be infected with avian Plasmodium. However, no vector species of the avian malaria in this island have been revealed yet. To speculate potential vectors, we collected mosquitoes there and investigated using a PCR procedure whether the mosquitoes harbor avian malaria or not. Totally 1,264 mosquitoes including 9 species were collected during March 2006 to February 2007. The mosquitoes collected were stored every species, sampled date and location for DNA extraction. Fifteen out of 399 DNA samples showed positive for the partial mtDNA cytb gene of avian Plasmodium. Estimated minimum infection rate among collected mosquitoes was 1.2% in this study. Four species of mosquitoes; Aedes albopictus, Culex quinquefasciatus, Lutzia fuscanus and Mansonia sp. had avian Plasmodium gene sequences. Detected DNA sequences from A. albopictus and L. fuscanus were identical to an avian Plasmodium lineage detected in bull-headed shrike (Lanius bucephalus) captured in the island. Different sequences were detected from C. quinquefasciatus, which were corresponding to an avian Plasmodium from a sparrow (Passer montanus) and Plasmodium gallinaceum. Our results suggest that A. albopictus, Lutzia fuscanus, C. quinquefasciatus, and Mansonia sp. could be potential vectors of avian malaria in Minami Daito Island. This study was the first report of molecular detection of avian Plasmodium from mosquitoes in Japan.

Avian Malaria

Plasmodium gallinaceum

Plasmodium (life cycle)

Aedes albopictus

Culex quinquefasciatus

10.1292/jvms.70.1205

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Citations (54)

Japanese Journal of Ornithology (2005)

Sayaka Horie

10.3838/jjo.54.58

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Citations (1)

Harmful Effects of Invasive Yellow Crazy AntAnoplolepis gracilipeson Three Land Bird Species of Minami-Daito Island

ORNITHOLOGICAL SCIENCE (2009)

Shin Matsui Tomonori Kikuchi Kana Akatani Sayaka Horie Masaoki Takagi

This report describes, for the first time, harmful effects of invasive Yellow Crazy Ants Anoplolepis gracilipes on wild birds in Japan. We observed fledglings of Bull-headed Shrike Lanius bucephalus and Daito White-eye Zosterops japonicus daitoensis caused fatal injuries by ants on the ground on Minami-daito Island. We compared reproductive behaviors of Daito Scops Owl Otus elegans interpositus in a cavity with ants and cavities without ants and found that while reproductive success did not differ between them, parental females in a cavity with ants more frequently interchanged their nest site than those in cavities without ants.

10.2326/048.008.0111

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Citations (14)

Research trends and current issues in life-history studies of birds

Japanese Journal of Ornithology (2014)

Sayaka Horie

鳥類は生活史進化の研究において最も古い研究対象であるが,今なおその進化機構の解明には議論が続いている.Ricklefs(2000a)は生活史進化の研究史を2つに分けた.第1期はLackを初めとする鳥類学者が生活史を自然選択の枠組みで捉え,その進化について議論を開始した時期,第2期は生活史理論が成熟してその進化機構を実証しようと研究が進められてきた時期である.この第2期の流れは現在も続いているが,2000年前後を境に生活史進化の分野には新たな視点が加わり,研究は次のステージに入ったと考えられる.つまり,一腹卵数以外の生活史形質への研究拡大,餌資源の制約や捕食以外の新たな選択圧の探索,そして生活史を規定する内的機構の解明といった視点である.これらの研究によって,生活史進化を複合的・総合的に説明する土台が築かれつつある.本稿では,このような研究の転換から10-15年経った現時点において,新旧の選択圧が生活史に与える影響はどの程度検証されているか整理した.それぞれの選択圧についての検討には,個体や個体群内での影響を評価した可塑的なものと,種間比較や個体群間比較などから進化的な影響を推察したものがあったが,後者については検証が不十分なものが多かった.これらの問題点を含めて鳥類における生活史進化の現状と課題を議論し,日本における生活史研究の方向性について述べる.

10.3838/jjo.63.197

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Citations (3)

Photochromism and Chirality Propagation of Chromene Amphiphile Aggregates in Aqueous Ethanol Solutions

Chemistry Letters (2007)

Takayoshi Kawasaki Sayaka Horie Kentarou Asaoka Yuichi Manaka Yusuke Yonamine

Spectroscopic and morphologic characteristics of an racemic chromene cationic amphiphile 1+ having a chiral camphor sulfonate counter anion ((+) or (−) CS∗−) were studied in aggregates in aqueous ethanol solutions. The media-dependent photochromism of 1+/CS∗− and the enantio-preferential selective ring-closing process after UV irradiation were observed owing to the propagation of the chirality from the counter anion CS∗−.

Chirality

Camphor

Cationic polymerization

10.1246/cl.2007.1048

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Citations (2)