The modulating role of traits on the biogeographic dynamics of chondrichthyans from the Neogene to the present

The environmental transformations that occurred during the Neogene had profound effects on spatio-temporal biodiversity patterns, yet the modulating role of traits (i.e. physiological, ecological and life history traits) remains little understood. We tested this idea using the Neogene fossil record of chondrichthyans along the temperate Pacific coast of South America (TPSA). Information of georeferenced occurrences and ecological and life history information of 38 chondrichthyan fossil genera in 42 Neogene sites was collected. Global georeferenced records were used to estimate present-day biogeographic distributions of the genera and to characterize the range of oceanographic conditions in which each genus lives as a proxy of their realized niche. Biogeographic range shifts (Neogene - present) were evaluated at regional and local scales. The role of traits as drivers of different range dynamics was evaluated using random forest models. The magnitude and direction of biogeographic range...

新近纪（Neogene）期间发生的环境变迁对时空生物多样性格局产生了深远影响，但性状（traits，即生理、生态及生活史性状）的调控作用仍鲜为人知。我们以南美温带太平洋沿岸（TPSA）的软骨鱼纲（Chondrichthyes）新近纪化石记录为研究对象，对这一假说展开验证。本研究收集了42个新近纪地层位点中38个软骨鱼纲化石属的地理定位产出数据，以及其生态与生活史相关信息。我们利用全球地理定位记录，估算了各化石属现今的生物地理分布范围，并以各属现存栖息的海洋环境条件范围作为其实际生态位（realized niche）的替代指标。我们在区域与局域尺度上，评估了（新近纪至现今的）生物地理分布范围变化。我们采用随机森林模型（Random Forest），评估了性状作为不同分布动态驱动因子的作用。生物地理分布范围的幅度与方向……