Lifetime reproductive output and life-history traits of lizards

Aim: Latitudinal gradients in life-history traits are apparent in many taxa and are expected to be strong for ectotherms that have temperature-driven constraints on performance and fitness. The strength of these gradients, however, should also be affected by diet. Because diet type (carnivory, omnivory, herbivory) influences accessibility to nutrition and assimilation efficiency, we aim to study how diet affects latitudinal gradients in lifetime reproductive output and the underlying life-history traits in ectotherms.

Location: Global.

Time period: Recent.

Major taxa studied: Lizards (Reptilia, Squamata, Sauria).

Methods: We used empirical (352 species) and phylogenetically imputed data (563 species) to analyse the interactive effects of latitude and diet on life-history traits (longevity, age at maturity, reproductive lifespan, hatchling mass, clutch/brood size, clutch/brood frequency, female mass) and lifetime reproductive output of lizards.

Results: Lifetime reproducti...

研究目标：诸多类群的生活史特征（life-history traits）均呈现纬度梯度格局，对于生理表现与适合度受温度驱动限制的变温动物（ectotherms）而言，这类梯度的强度预期会尤为显著。然而，此类梯度的强度同时亦会受到食性的影响。由于食性类型（肉食性carnivory、杂食性omnivory、植食性herbivory）可影响营养可及性与同化效率，本研究旨在探讨食性如何影响变温动物的终生繁殖产出及其潜在生活史特征的纬度梯度。
研究区域：全球范围。
研究时段：近期。
研究类群：蜥蜴（Reptilia爬行纲、Squamata有鳞目、Sauria蜥蜴亚目）。
研究方法：本研究采用实测数据（涵盖352个物种）与系统发育推演数据（phylogenetically imputed data，涵盖563个物种），分析纬度与食性对蜥蜴生活史特征（寿命、性成熟年龄、繁殖寿命、幼体体重、窝卵/窝仔数、繁殖频次、雌性体重）及终生繁殖产出的交互效应。
研究结果：终生繁殖……