ABSTRACT In many dioecious plant populations, males and females appear to be spatially segregated, a pattern that is difficult to explain given its potentially high costs. However, in asexually propagating species, spatial segregation of the sexes may be indistinguishable from superficially similar patterns generated by random establishment of a few genets followed by extensive clonal spread an...

Using surveys of natural populations, experimental crosses, and common garden trials, we tested the hypothesis that hybrid cottonwoods (Populus fremontii × P. angustifolia) from the Weber River in northern Utah would produce as many viable offspring as their parental species. We found that both F(1) generations and backcross generations can be just as fit as the parent taxa. First, F(1) hybrids...

This study aimed to establish the colonization behavior and proliferation potential of three endophytes and one pathogen Ganoderma boninense (Gb) introduced into oil palm ramets (host model). The endophytes selected were Diaporthe phaseolorum (WAA02), Trichoderma asperellum (T2), and Penicillium citrinum (BTF08). Ramets were first inoculated with 100 mL of fungal cells (106 cfu mL-1) via soil d...

Environmental conditions of a parent plant can influence the performance their clonal offspring, and such transgenerational effects may help offspring adapt to different environments. However, it is still unclear how many vegetative generations transmit for whether depends on environmental offspring. We grew ancestor ramets floating Spirodela polyrhiza under high low nutrient level obtained so-...

We studied some ecological parameters such as richness, abundance, density, biomass and variation in species composition in four vegetation zones and in a zone with anthropic disturbance in the Massambaba Restinga in Arraial do Cabo, Rio de Janeiro State. We sampled 100 plots of 100 m(2) (10 x 10 m) recording the bromeliad species and their abundance. We found a total of seven bromeliad species...

We propose an IBM for clonal plant dynamics, focusing on the effects of the network structure of the plants on the reproductive strategy of ramets. After some numerical tests we propose a large population approximation as an advection-diffusion PDE for population densities. 1 The model Individual-based models are in constant development in computational ecology. These models aim to represent th...

Shrub species have increased in density and cover desertification areas, however, the role of sandy habitats contributing to expansion shrubs is poorly understood. Although effect on plant growth reproduction been demonstrated, most existing studies lack either experimental demonstration or an integrated study during whole shrub life cycle. We performed field laboratory experiments examine resp...

Intensive growth of cyanobacteria in freshwater promoted by eutrophication can lead to release of toxic secondary metabolites that may harm aquatic organisms and humans. The serine protease inhibitor aeruginosin 828A was isolated from a microcystin-deficient Planktothrix strain. We assessed potential molecular effects of aeruginosin 828A in comparison to another cyanobacterial serine protease i...

Ecology and Evolutionary Biology Interdepartmental Graduate Program, 353 Bessey Hall, Iowa State University, Ames, IA 50011-1020, USA (JLO) Department of Ecology, Evolution, and Organismal Biology, 353 Bessey Hall, Iowa State University, Ames, IA 50011-1020, USA (BJD) Present address of JLO: National Center for Ecological Analysis and Synthesis, 735 State Street, Suite 300, Santa Barbara, CA 39...