论文标题
在进化背景下生命的星际透射
Interplanetary transmissions of life in an evolutionary context
论文作者
论文摘要
岩石植物理论提出了通过陨石之间太阳系体之间生物体的自然交换。该理论的重点包括三个不同的阶段:行星弹射,行星际运输和行星进入。但是,有争议的是,在射流中运输的生物是否可以在这三个阶段生存。如果构想了猜想,那么生活确实可以安全地从一个世界传播到另一个世界,那么它不仅是一个与行星科学有关的话题,而且是生物科学的话题。因此,这些阶段只是方程式的前三个因素。成功岩石植物的其他因素是传播生物的质量,数量和进化策略。当扩展到新环境中时,入侵的生物通常在第一次尝试中无法生存,通常需要通过繁殖压力进行几次尝试才能获得立足点。这种陆地局势与岩石植物植物所带来的情况之间存在至关重要的差异。虽然地球上的入侵物种反复进入一个新的栖息地,但一个物种务实地到达另一个太阳系身体。因此,全有或全无的响应将有效。该物种必须在第一次尝试中生存,这限制了生存的可能性。此外,进化通过存在两个世界之间的生活交流之间存在相反的情况来设定边界,从而进一步限制了生存的概率。但是,陆地种群经常遇到不可预测和可变的环境条件,这反过来需要进化反应。因此,尤其是一种进化模式,押注对冲是一种进化策略,可以最好地平滑这种反比例。
The theory of lithopanspermia proposes the natural exchange of organisms between solar system bodies through meteorites. The focus of this theory comprises three distinct stages: planetary ejection, interplanetary transit and planetary entry. However, it is debatable whether organisms transported within the ejecta can survive all three stages. If the conjecture is granted, that life can indeed be safely transmitted from one world to another, then it is not only a topic pertaining to planetary science but also biological sciences. Hence, these stages are only the first three factors of the equation. The other factors for successful lithopanspermia are the quality, quantity and evolutionary strategy of the transmitted organisms. When expanding into new environments, invading organisms often do not survive in the first attempt and usually require several attempts through propagule pressure to obtain a foothold. There is a crucial difference between this terrestrial situation and the one brought about by lithopanspermia. While invasive species on Earth repeatedly enters a new habitat, a species pragmatically arrives on another solar system body only once; thus, an all-or-nothing response will be in effect. The species must survive in the first attempt, which limits the probability of survival. In addition, evolution sets a boundary through the existence of an inverse proportionality between the exchanges of life between two worlds, thus further restricting the probability of survival. However, terrestrial populations often encounter unpredictable and variable environmental conditions, which in turn necessitates an evolutionary response. Thus, one evolutionary mode in particular, bet hedging, is the evolutionary strategy that best smooth out this inverse proportionality.