A simple spatially explicit neutral model explains the range size distribution of reef fishes
A simple spatially explicit neutral model explains the range size distribution of reef fishes
复制标题
DOI：
10.1111/geb.12899
复制
发表时间：
2019-07-01
影响因子：
6.4
通讯作者：
Etienne, Rampal S.
中科院分区：
文献类型：
--
作者：
Alzate, Adriana;Janzen, Thijs;Etienne, Rampal S.
目的几十年来，物种间活动范围的巨大差异一直吸引着生态学家。与珊瑚礁有关的鱼类生活在高度空间结构化的生境中，并采取广泛的扩散策略。因此，我们预计具有更大传播能力的物种将占据更大的范围。然而，这种扩散和范围大小之间的正相关关系的经验证据仍然很少。在这里，我们揭示了扩散的作用范围大小分布的珊瑚礁相关的鱼类使用经验数据和一种新的空间显式模型。位置热带东太平洋。主要分类群研究珊瑚礁相关鱼类。基本记录来自20世纪和21世纪。方法我们估计范围大小分布的所有珊瑚礁相关的鱼类分为6个公会，每个不同的扩散能力。我们使用了一个一维的空间显式中性模型，它模拟了物种的分布沿着线性和连续的海岸线，探讨扩散，物种形成和采样的范围大小的分布的影响。我们的模型采用了生物学上重要的长距离扩散事件与肥尾扩散内核，也采用了一个更现实的逐渐“旷日持久”的物种形成过程比原来使用的中性理论。我们拟合模型的经验数据，使用近似贝叶斯计算方法，与顺序蒙特卡罗算法。结果随机出生，死亡，物种形成和扩散事件单独可以准确地解释经验范围大小分布为6个不同的公会的热带，珊瑚礁相关的鱼类。在范围大小分布的变化，公会之间的解释纯粹的差异，最好的分散器分布在更大的范围内的扩散能力。主要结论中性的过程和行业协会的特定的扩散能力提供了一个一般的解释内和跨行业协会范围的大小变化。我们的研究结果支持理论上预期的，但经验上有很大的争议，假设高扩散能力促进建立大范围的大小。
Aim The great variation in range sizes among species has fascinated ecologists for decades. Reef-associated fish species live in highly spatially structured habitats and adopt a wide range of dispersal strategies. We consequently expect species with greater dispersal ability to occupy larger ranges. However, empirical evidence for such a positive relationship between dispersal and range size remains scarce. Here, we unveil the role of dispersal on the range size distribution of reef-associated fishes using empirical data and a novel spatially explicit model. Location Tropical Eastern Pacific. Major taxa studied Reef-associated fishes. Time period Underlying records are from the 20th and 21st centuries. Methods We estimated range size distributions for all reef-associated fishes separated into six guilds, each with different dispersal abilities. We used a one-dimensional spatially explicit neutral model, which simulates the distribution of species along a linear and contiguous coastline, to explore the effect of dispersal, speciation and sampling on the distribution of range sizes. Our model incorporates biologically important long-distance dispersal events with a fat-tailed dispersal kernel and also adopts a more realistic gradual "protracted" speciation process than originally used in neutral theory. We fitted the model to the empirical data using an approximate Bayesian computation approach, with a sequential Monte Carlo algorithm. Results Stochastic birth, death, speciation and dispersal events alone can accurately explain empirical range size distributions for six different guilds of tropical, reef-associated fishes. Variation in range size distributions among guilds are explained purely by differences in dispersal ability with the best dispersers being distributed over larger ranges. Main conclusions Neutral processes and guild-specific dispersal ability provide a general explanation for both within- and across-guild range size variation. Our results support the theoretically expected, but empirically much debated, hypothesis that high dispersal capacity promotes the establishment of large range size.