Plant Competition Experiments: Testing Hypotheses and Estimating the Probability of Coexistence
نویسنده
چکیده
The analysis of plant competition experiments with variable plant density is discussed based on three published data sets. It is shown how conclusions regarding plant community dynamics from typical plant competition experiments can be extended and based on a statistical framework. The data are tested in hyperbolic competition models of decreasing complexity by a standard hierarchical statistical procedure. Hypotheses on the shape of the response surface curves, the number of necessary parameters, and the effects of competition on plant growth were tested using maximum likelihood ratio tests. The conditions for coexistence in a hyperbolic competition model were examined analytically. Using the found conditions for coexistence and Bayesian statistics, the probability of the four possible outcomes of two-species competition was estimated in a competition experiment with Avena fatua and A. barbata.
منابع مشابه
Elevated carbon dioxide is predicted to promote coexistence among competing species in a trait‐based model
Differential species responses to atmospheric CO 2 concentration (Ca) could lead to quantitative changes in competition among species and community composition, with flow-on effects for ecosystem function. However, there has been little theoretical analysis of how elevated Ca (eC a) will affect plant competition, or how composition of plant communities might change. Such theoretical analysis is...
متن کاملA hybrid model for estimating the probability of default of corporate customers
Credit risk estimation is a key determinant for the success of financial institutions. The aim of this paper is presenting a new hybrid model for estimating the probability of default of corporate customers in a commercial bank. This hybrid model is developed as a combination of Logit model and Neural Network to benefit from the advantages of both linear and non-linear models. For model verific...
متن کاملExperimental evidence rejects pairwise modelling approach to coexistence in plant communities.
Competition is often invoked as the cause of plant species loss with increasing system productivity. Experimental results for multispecies assemblages are virtually absent and mathematical models are thus used to explore the relationship between competition and coexistence. Modelling approaches to coexistence and diversity in competitive communities commonly employ Lotka-Volterra-type (LV) mode...
متن کاملCoexistence, Exclusion, or Neutrality? a Meta-analysis of Competition between Aedes Albopictus and Resident Mosquitoes.
Competition experiments estimating the relative effects of inter- and intraspecific competition can help to resolve whether interspecific competition results in coexistence or exclusion. For mosquitoes, most such experiments have focused on invasive Aedes albopictus and its interactions with resident Aedes. A meta-analysis of such experiments tested whether the effect of interspecific competiti...
متن کاملCoexistence and relative abundance in annual plant assemblages: the roles of competition and colonization.
Although an interspecific trade-off between competitive and colonizing ability can permit multispecies coexistence, whether this mechanism controls the structure of natural systems remains unresolved. We used models to evaluate the hypothesized importance of this trade-off for explaining coexistence and relative abundance patterns in annual plant assemblages. In a nonspatial model, empirically ...
متن کامل