DNA research reveals how snakes invaded Guam
DNA 研究揭示蛇類如何入侵關島
更新於: 2026年7月27日 上午04:45
Invasive species often face a 'genetic bottleneck' when a small group colonizes a new area, which typically limits their survival.
外來入侵種在小群體殖民新區域時，通常會面臨「遺傳瓶頸」，這通常會限制牠們的生存。
However, the brown tree snake in Guam has defied this rule, reaching densities of up to 30,000 snakes per square mile since arriving as cargo stowaways after World War II.
然而，關島的棕樹蛇打破了這條規則，自二次世界大戰後作為貨物偷渡客抵達以來，其密度已達到每平方英里三萬條蛇。
By using advanced DNA sequencing, researchers identified over 19,000 'structural variants'—large-scale changes in their genetic code.
透過使用先進的 DNA 定序技術，研究人員識別出超過一萬九千個「結構變異」(Structural variants)——即遺傳密碼中大規模的改變。
This discovery explains how the population became so resilient despite its limited starting numbers.
這項發現解釋了為何這些蛇在初始數量有限的情況下，族群仍能變得如此強韌。
The invasion has been devastating for native wildlife, causing the extinction of many birds and lizards.
這場入侵對當地野生動物造成了毀滅性打擊，導致許多鳥類與蜥蜴滅絕。
While the ecological damage is clear, this research provides a breakthrough in understanding the 'invasion paradox.'
儘管生態破壞顯而易見，但這項研究為理解「入侵悖論」(Invasion paradox) 提供了突破性進展。
It shows that structural genetic variation can act as a powerful engine for adaptation, allowing invasive species to bypass traditional evolutionary roadblocks.
它表明結構性遺傳變異可作為適應的強大引擎，讓入侵物種能繞過傳統的演化障礙。
