Competition for nitrogen (N), particularly in resource-limited habitats, might be avoided by different N acquisition strategies of plants. In our study, we investigated whether slow-growing European beech and fast-growing sycamore maple seedlings avoid competition for growth-limiting N by different N uptake patterns and the potential alteration by soil N availability in a microcosm experiment. ...

In this article, we propose a general two species contest competition model subject to Allee effects and study its population dynamics to obtain insights on how the interplay of Allee effects and contest competitions affect the persistence and the extinction of two competing species. By using the monotone dynamical theory and the properties of critical curves for non-invertible maps, our analys...

The dynamics of a general nonlinear Leslie matrix model for a semelparous population is investigated. We are especially concerned with the attractivity of the single-class state, in which all but one cohort (or year-class) are missing. Our result shows that the single-class state is attractive if inter-class competition is severe. Conversely, if intra-class competition is severe, the single-cla...

This paper exposes some common misinterpretations of the "new trade theory". First, the view that high scale economies give rise to high levels of intra-industry trade is challenged. It is shown that the monopolistic-competition trade model predicts a negative relationship between internal scale economies and intraindustry trade. Second, in spite of a common perception that the "new" theory exp...

Objective: A field experiment was conducted to assess the optimum inter- and intra-row spacing on growth, yield and yield component of roselle (Hibiscus sabdariffa L.) in 2014/15 cropping season at Wondo Genet Agricultural Research Center experimental site (at Wondo Genet station). Methods: Two inter-row spacings (60 and 90 cm) and three intra-row spacings (30,...