外来種の動植物は在来種の100倍の速さで生息域を拡大していることが新しい研究で明らかに(Non-native Plants and Animals Expanding Ranges 100 Times Faster than Native Species, Finds New Research Led by UMass Amherst)

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2024-06-18 マサチューセッツ大学アマースト校

外来種の動植物は在来種の100倍の速さで生息域を拡大していることが新しい研究で明らかに(Non-native Plants and Animals Expanding Ranges 100 Times Faster than Native Species, Finds New Research Led by UMass Amherst)
Non-native species (red) are spreading muchfaster than native species (blue). The dotted line indicates how fast species need to move to keep up with climate change. Credit: 10.1146/annurev-ecolsys-102722-013135

国際研究チームが、外来種が人間の影響で在来種よりもはるかに速く移動範囲を拡大していることを発見しました。特に外来植物は在来植物の3倍の速度で移動しています。気候変動に伴い、植物や動物が生存するためには年間3.25キロメートル移動する必要がありますが、在来種はこれに追いつけず、人間の助けが不可欠です。外来種は年間約35キロメートル移動していますが、人間の影響を受けるとその速度は1,883キロメートルに達します。この研究は、在来種が気候変動に対応するためには「補助移動」を真剣に考慮する必要があることを示唆しています。

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気候変動に伴う在来種と外来種の生息域の変化とその可能性
Observed and Potential Range Shifts of Native and Nonnative Species with Climate Change

Bethany A. Bradley, Evelyn M. Beaury, Belinda Gallardo, Inés Ibáñez, Catherine Jarnevich, Toni Lyn Morelli, Helen R. Sofaer, Cascade J.B. Sorte, and Montserrat Vilà +
Annual Reviews of Ecology, Evolution and Systematics  Published:June 17, 2024
DOI:https://doi.org/10.1146/annurev-ecolsys-102722-013135

There is broad concern that the range shifts of global flora and fauna will not keep up with climate change, increasing the likelihood of population declines and extinctions. Many populations of nonnative species already have advantages over native species, including widespread human-aided dispersal and release from natural enemies. But do nonnative species also have an advantage with climate change? Here, we review observed and potential range shifts for native and nonnative species globally. We show that nonnative species are expanding their ranges 100 times faster than native species, reflecting both traits that enable rapid spread and ongoing human-mediated introduction. We further show that nonnative species have large potential ranges and range expansions with climate change, likely due to a combination of widespread introduction and broader climatic tolerances. With faster spread rates and larger potential to persist or expand, nonnative populations have a decided advantage in a changing climate.

生物環境工学
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