Data from: Life histories and invasions: accelerated laying rate and incubation time in an invasive lizard, Anolis sagrei

Faster life histories are correlated with greater invasion success across taxa. However, comparisons of life-history traits across native and invasive ranges are rare, and thus it is unknown whether invasions lead directly to evolutionary shifts in life histories. Here we compare life history traits of three invasive populations of brown anoles (Anolis sagrei) to a representative native population. In a common garden, we measured a number of reproductive traits including egg-laying rate and incubation period. We hypothesized that invasive populations would exhibit faster reproduction because fast life histories are favoured both by the invasion itself and by shorter breeding seasons in the invasive range. Compared to native females, invasive females had shorter interlaying intervals and produced eggs that hatched more quickly. Invasive and native populations did not differ consistently in egg size, hatching success, or hatchling size. Our results indicate that life history traits have rapidly diverged during the brown anole invasion, potentially facilitating the successful establishment and expansion of the species range.跨多个生物类群而言，更快的生活史（life history）与更高的入侵成功率呈显著正相关。然而，针对原生分布区与入侵分布区的生活史性状（life-history trait）开展的比较研究较为匮乏，因此目前尚不明确入侵过程是否会直接引发生活史层面的演化转变。本研究将三个入侵种群的棕安乐蜥（Anolis sagrei）的生活史性状，与一个具有代表性的原生种群进行对比。我们在同质园实验（common garden）中测定了多项繁殖性状，包括产卵速率与孵化周期。我们提出假说：入侵种群会表现出更快的繁殖速率，这是因为入侵过程本身，以及入侵分布区较短的繁殖季，都更青睐快速的生活史策略。与原生种群的雌性个体相比，入侵种群的雌性个体产卵间隔更短，且其所产的卵孵化速度更快。入侵种群与原生种群在卵大小、孵化成功率或幼体体型方面并未表现出一致的差异。本研究结果表明，在棕安乐蜥的入侵过程中，其生活史性状已发生快速分化，这或许有助于该物种成功定殖并扩大其分布范围。