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https://www.researchgate.net/publication/277950960

In many habitats ants form a major part of the arthropod fauna found on vegetation, and recent studies have shown that the abundance and diversity of ant–plant associations is particularly remarkable in the tropical region. For instance, one-third of the plant species in a Panamanian forest (Schupp & Feener 1991) and over 20% of the woody species in a Brazilian savanna (Oliveira & Oliveira-Filho 1991) were found to produce ant rewards. Furthermore, 312 ant–plant interactions were recorded in one Mexican coastal site (Rico-Gray 1993), and the ant–plant community in an Amazonian rainforest comprised 377 plants per ha (Fonseca & Ganade 1996). In the tropics many ant species use plant surfaces as a foraging substrate to search for both live and dead animal prey, as well as for  different types of plant-derived food products (Carroll & Janzen 1973). Ant activity on foliage can be promoted by the occurrence of predictable and immediately renewable food sources, including extrafloral nectar, honeydew from phloemfeeding hemipterans, and secretions from lepidopteran larvae (see Way 1963; Bentley 1977; Buckley 1987; Koptur 1992; Pierce et al. 2002). In fact, plant- and insect-derived liquid foods appear to provide a large amount of the energy supply of foliage-dwelling ants (Tobin 1994; Davidson et al. 2003).