日本地球惑星科学連合2018年大会

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[EE] Eveningポスター発表

セッション記号 S (固体地球科学) » S-CG 固体地球科学複合領域・一般

[S-CG55] Various interactions between solid Earth and climates

2018年5月21日(月) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:中川 貴司(海洋研究開発機構数理科学・先端技術研究分野)、横山 祐典(東京大学 大気海洋研究所 高解像度環境解析研究センター)、奥野 淳一(国立極地研究所、共同)、山崎 雅(産業技術総合研究所)

[SCG55-P03] The Pliocene-Pleistocene transition had dual effects on North American migratory bird speciation

*横山 祐典1平瀬  祥太朗2シンティー リー3岩崎 渉4 (1.東京大学 大気海洋研究所 高解像度環境解析研究センター、2.東京大学 大学院農学生命科学研究科、3.ライス大学 地球・環境・惑星科学専攻、4.東京大学 大学院理学系研究科 生物科学専攻)

キーワード:氷期間氷期、氷床、生物情報学

Paleo-environmental change is thought to substantially influence biological evolution. In particular, fragmenta- tion of the geographical distributions of vertebrate faunas and subsequent speciation events occurred frequently due to glacial advances after the Pliocene-Pleistocene transition 2.5 million years ago (Ma). However, the effects of glacial advances on speciation between migratory and sedentary birds have not been systematically evaluated. Here, we conducted phylogenetic meta-analysis of 14 closely related pairs of the North American migratory spe- cies and 25 closely related pairs of the North American migratory and neotropical sedentary species and estimat- ed their divergence times using cytochrome b. Whereas divergence events between migratory species were mostly in the Pleistocene (median 1.51 Ma) as previously reported, many divergence events between the migra- tory and sedentary bird species appear to date back to the Pliocene (median 2.77 Ma). These speciation patterns indicate that the Pliocene-Pleistocene transition may have accelerated speciation between migratory bird spe- cies, but did not accelerate that between migratory and sedentary species through counteracting mechanisms.