海洋分散によるカメレオン放射.
C J Raxworthy1, M R J Forstner, R A Nussbaum
1American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024-5192, USA. rax@amnh.edu
Nature
|February 15, 2002
まとめ
カメレオン進化は,古代の大陸の分裂ではなく,マダガスカルからの海洋的分散によって引き起こされた. この研究は,インド洋のカメレオン多様性を形にした複数の分散イベントを明らかにしています.
科学分野:
- * 歴史的生物地理学と進化生物学.
背景:
- * 大陸の断片化 (例えば,ゴンドワナ分裂) に焦点を当てたバイカリアンス・メソッドは,歴史的生物地理学を支配する.
- *以前は,カメレオンがマダガスカルとアフリカの間のゴンドワナの代理人と一致する生物地理的パターンを表していると考えられていた.
研究 の 目的:
- * 分子学的および形態学的データを用いてカメレオン生物地理学的歴史を調査する.
- * ヴァカリアント起源の仮説と分散誘発放射線の仮説を検証する.
主な方法:
- * 分子および形態学的証拠を用いた52のカメレオン属の系統遺伝分析.
- * 生物地理学的歴史を推論するためにエリアクラドグラムの構築.
主要な成果:
- * 系統遺伝学と領域クラドグラムの分析は,カメレオンの単純なヴァカリアントの歴史を支持しません.
- *証拠は,カメレオン種の放射線の主な原動力として,海洋的な分散を指摘しています.
- * マダガスカル起源が支持され,アフリカとインド洋諸島への複数の分散イベントがあります.
結論:
- *海洋的な分散,特に"マダガスカル外"のイベントは,カメレオン種の形成と放射線を促進しました.
- *この発見は,陸上の脊椎動物の進化における海洋分散の重要な役割を強調し,従来のヴァカリアンスベースのモデルに挑戦しています.
関連する概念動画
Distribution and Dispersion
20.8K
To understand intra-specific interactions in populations, scientists measure the spatial arrangement of species individuals. This geographic arrangement is known as the species distribution or dispersion. Highly territorial species exhibit a uniform distribution pattern, in which individuals are spaced at relatively equal distances from one another. Species that are highly tied to particular resources, such as food or shelter, tend to concentrate around those resources, and thus exhibit a...
20.8K
Formation of Species
36.9K
Speciation describes the formation of one or more new species from one or sometimes multiple original species. The resulting species are discrete from the parent species, and barriers to reproduction will typically exist. There are two primary mechanisms, speciation with and without geographic isolation—allopatric and sympatric speciation, respectively.
36.9K
Speciation Rates
18.8K
Overview
18.8K
Predator-Prey Interactions
17.2K
Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
17.2K
Channel Rhodopsins
2.5K
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
2.5K
Diversity of Protists III
2.1K
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
2.1K


