We have analyzed two Arabidopsis strains differing in the mean seed size and seed number they produced. The accession Cape Verde Islands (Cvi) yielded on average about 40% fewer seeds than the laboratory strain Landsberg erecta (Ler), but Cvi seeds were almost twice as heavy. Maternal and nonmaternal genetic factors were involved in the seed size variation, and interactions between both types o...

The number of individuals within a population or community and their body size can be associated with changes in resource supply. While these relationships may provide a key to better understand the role of abiotic vs. biotic constraints in animal communities, little is known about the way size and abundance of organisms change along resource gradients. Here, we studied this interplay in ants, ...

Ectomycorrhizal and saprotrophic agaricoid basidiomycetes show diverse morphological reproductive traits, a phenomenon which has been attributed to their different lifestyles. From previous studies, we know that such differences are also reflected in assembly formation. Regardless of these differences, and assuming that dispersal fitness, predominantly by air movement, is one of the prevalent f...

This paper adds a nonrenewable resource to capital and labor in the neoclassical growth model. The nonrenewable resource introduces its depletion dynamics and expands the influence of input substitution on the growth path. Optimal depletion implies a rising resource price but investment or labor growth may raise extraction along the growth curve. Substitution between inputs plays a critical rol...