Research press release


Nature Geoscience

Mountain growth spawns fish diversity in New Zealand



Dave Crawたちは、数値モデルを用いて、過去2500万年にわたるニュージーランド南島の地形的進化を再現した。Crawたちは、島の景観は6種の主要なテクトニック地域で発達し、それぞれが際立った排水集水域を持つことを示した。Crawたちは、これらの流域で400種以上の生育地から得られた1000種以上の種に基づいて、新規および既存の淡水魚集団の進化樹を分析し、魚のDNA系列は、時と共に山脈の成長と相前後して分散したことを示している。

The growth of mountain ranges on New Zealand’s South Island directly influenced the evolution of different freshwater fish species in the region, reports a paper published online this week in Nature Geoscience. The study provides an example of how natural changes in the Earth’s landscape and topography can help shape and increase local biodiversity.

Mountain ranges form when tectonic plates collide, and the uplift of a new range can separate biological populations and eventually lead to the creation of new species. However, clear examples of the links between the changing topographic landscape and biodiversity are rare.

Dave Craw and colleagues used a numerical model to reconstruct the topographic evolution of the South Island of New Zealand over the past 25 million years. They show that the island’s landscape developed in six main tectonic zones, each with distinct river drainage catchments. The authors then used new and existing analyses of the evolutionary tree of freshwater fish populations from these drainage catchments, based on over 1,000 specimens from more than 400 localities, to show that the fish DNA sequences diverge over time, in tandem with the growth of the mountains.

doi: 10.1038/ngeo2618


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