Research press release


Nature Communications

Evolution: Marine crustaceans diversified faster during periods of global cooling



今回、Katie Davisたちは、過去2億年にわたる異尾下目における種分化速度と気候の関係を調べた。その結果、種分化速度の顕著な変化が起きたのが過去1億年間に限定されていたことが分かった。海洋クレードの種分化速度は、気温と負の相関関係にあった。これに対して、異尾下目の1つの淡水クレードは、気温が上昇すると種分化速度も上昇した。


Historically, the speciation rate of marine crustaceans in the Anomura group (including hermit crabs, king crabs, and squat lobsters) has increased when global temperatures have decreased, finds a study published in Nature Communications this week. Global cooling may have altered the habitats occupied by marine crustaceans through changes in tectonic activity and ocean currents, lowered sea level, and increased oxygen availability.

Changes in climate can increase extinction rates by making habitats unsuitable for the species previously living in them. Yet, studies have also found a relationship between climate and speciation rates, with higher speciation rates in groups of terrestrial and marine vertebrates associated with warmer global temperatures.

Katie Davis and colleagues investigated the relationships between speciation rate and climate in the Anomura over the last 200 million years. They found that significant shifts in the rates of speciation have only occurred in the last 100 million years. For marine clades, speciation rate was negatively correlated with temperature. However, for the one freshwater clade in the Anomura, speciation rate increased with increasing temperature.

These findings suggest that future global warming will increase speciation rates in some habitats, but decrease speciation rates in other habitats.

doi: 10.1038/ncomms13003

「Nature 関連誌注目のハイライト」は、ネイチャー広報部門が報道関係者向けに作成したリリースを翻訳したものです。より正確かつ詳細な情報が必要な場合には、必ず原著論文をご覧ください。

メールマガジンリストの「Nature 関連誌今週のハイライト」にチェックをいれていただきますと、毎週最新のNature 関連誌のハイライトを皆様にお届けいたします。