Large mammalian herbivores manifest a strong top‐down control on ecosystems that can
transform entire landscapes, but their impacts have not been reviewed in the context of …

The potential natural vegetation of southern Texas and northern Mexico has been classified
by plant geographers as savanna. However, many of the present landscapes in this …

In a fragmented, dry subtropical forest in northwestern Argentina, we compared pollination
levels, fruit set, and seed set among small (< 1 ha) forest fragments, large (> 2 ha) fragments …

Encroachment of trees and shrubs into grasslands and the 'thicketization'of savannas has
occurred worldwide over the past century. These changes in vegetation structure are …

In subtropical dry forest (Chaco Serrano) of Tucuman province, northwestern Argentina, we
assessed responses of the flower—visitor assemblage to habitat fragmentation by …

At savanna woodland sites in southern Texas, discrete clusters of woody plants form in
herbaceous clearings following the invasion of mesquite (Prosopis glandulosa var …

A major concern of managers of arid and semiarid rangelands is the progressive loss of
secondary productivity and diversity over the past century (Breman and de Wit 1983, Dean …

We examined the responses of a ground‐foraging ant community to a gradient of land‐use
intensity in a grazing agroecosystem in the Chaco of northern Argentina. The gradient …

How can environmental degradation be stopped? How can it be reversed? And how can the
damage already done be repaired? The authors of this volume argue that a two-pronged …

The distribution, ecology, and behaviour of ants (Hymenoptera: Formicidae) is profoundly
influenced by environmental stress and competition. As in plants, trade‐offs in adaptations to …