We investigate the distribution of flavonoids, a major category of plant secondary metabolites, across species. Flavonoids are known to show high species specificity, and were once considered as chemical markers for understanding adaptive evolution and characterization of living organisms. We investigate the distribution among species using bipartite networks, and find that two heterogeneous di...

Article history: Plant abundance data are o Received 10 January 2008 Received in revised form 6 February 2009 Accepted 7 February 2009

The ability o f species to establish new popuiations at unoccupied sites is a critical feature in the maintenance o f biological diversity, and it has taken on new importance as a result o f global climate change and expected changes in species distributior~ To examine the dispersal potential o f p lan t specie~ seeds o f four annual p ian t species were experimentally dispersed 40 to 600 m f r...

Quantifying crop residue cover on the soil surface is important for improving estimates of surface energy balance, net primary productivity, nutrient cycling, and carbon sequestration. Quantifying crop residue cover is also an important factor in controlling soil erosion and evaluating the effectiveness of conservation tillage practices. By reducing the movement of eroded soil into streams and ...

5 Predictive models constitute an important tool in ecology. Using presence/absence data of 6 15 plant species of an alpine rangeland in northern Spain, and a set of 14 topographical and 7 geomorphological descriptors of relatively easy acquisition, we examined and compared the 8 performance of five state-of-the-art methods used in ecological modeling: Multiple Logistic 9 Regression (MLR), Arti...