Predation changes the shape of thermal performance curves for population growth rate  

作　　者：Thomas M. LUHRING John P. DELONG 

机构地区：[1]School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588, USA

出　　处：《Current Zoology》2016年第5期501-505,共5页动物学报（英文版）

摘　　要：Ectotherms generally demonstrate nonlinear changes in performance （e.g., movement speed, indi- vidual growth, population growth） as a function of temperature that are characterized by thermal performance curves （TPC）. Predation risk elicits phenotypic and behavioral changes that likewise impact performance measures. We tested whether exposure to predation Orthocyclops modestus impacts the maximum population growth rate （rmax） TPC of the protist Paramecium aurelia. We fit predator and non-predator exposed P. aurelia population growth rates to a function previously shown to best describe Paramecium population growth rate TPC＇s （Lactin-2） and compared subse- quent parameter estimates between curves. For Paramecium exposed to predation risk, maximum population growth increased more rapidly as temperatures rose and decreased more rapidly as temperatures fell compared to the initial temperature. The area under each TPC curve remained ap- proximately the same, consistent with the idea of a trade-off in performance across temperatures. Our results indicate TPCs are flexible given variation in food web context and that trophic inter- actions may play an important role in shaping TPCs. Furthermore, this and other studies illustrate the need for a mechanistic model of TPCs with parameters tied to biologically meaningful properties.

关 键 词：PARAMECIUM phenotypic plasticity PREDATION reaction norm temperature thermal performance curve. 

分 类 号：Q[生物学]