Contrasting patterns in species abundance may similarly indicate differences in the way that communities are organized. For example, the periodic intrusion of seawater into salt marshes (Figure 2A ...

The otter-urchin-kelp interaction is an example of a trophic cascade. In this system, the otter (keystone species) increases the abundance of kelp (foundation species) by consuming urchins ...

This Issue focuses on ecological consequences of introduced species using several case studies - zebra mussels, brown tree snakes, fire ants, and gypsy moths. There are many, many more examples of ...