Contrasting stoichiometric dynamics in terrestrial and aquatic grazer–producer systems

Journal of Biological Dynamics

Colleen M. Davies¹  Hao Wang¹ 

[1] Department of Mathematical and Statistical Sciences, University of Alberta;

关键词: ecological stoichiometry;    p:c ratio;    terrestrial;    aquatic;    grazer;    producer;    bifurcation analysis;    sensitivity analysis;   

DOI  :  10.1080/17513758.2020.1771442

来源: DOAJ

【 摘 要 】

The turnover rate of producer biomass in aquatic ecosystems is generally faster than in terrestrial. That is, aquatic producer biomass grows, is consumed, and is replaced considerably faster than terrestrial. The WKL model describes the flow of phosphorus and carbon through a grazer–producer system, hence varying the model parameters allows for analysis of different ecosystems of this type. Here we explore the impacts of the intrinsic growth rate of the producer and the maximal ingestion rate of the grazer on these dynamics because these parameters determine turnover rate. Simulations show that for low intrinsic growth rate and maximal ingestion rate, the grazer goes extinct; for higher values of these parameters, coexistence occurs in oscillations. Sensitivity analysis reveals the relative importance of all parameters on asymptotic dynamics. Lastly, the impacts of changing these two parameters in the LKE model appears to be quantitatively similar to the impacts in the WKL model.

【 授权许可】

Unknown