Complex ity in biological systems cannot be measured by the number of species present, even though th is parameter is trad i· tionally used as an intu it ive measure of complexity. What matters in complexity is how many ...

The southern portion of the Chihuahuan Desert of subtropical north central Mexico (110, 186, 250, 254, 255, 262, 311) extends from the vicinity of Zacatecas and San Luis Potosi north to the area of Saltillo, Torreon, ...

Calcrpillars---taken here to mean the larvae of Lepidoptera-are nOI uniformly or randomly present in spe<:ics or abundance in tropical lowland habitats. Instead, it is evident (0 any field natu.ra1ist that tropica1 ...

Extinction events range from those that remove a single population from a local habitat to those megacatastrophes that obliterate tens of thousands of species over continents or oceans. When considering megacatastrophes, and ...

L-canavanine, a nonprotein amino acid structurally similar to L-arginine, is potentially toxic to many insects. In northwestern Guanacaste Province in Costa Rica, most insect seed predators do not feed on seeds that ...

Since 1961 a series of field biologists and field ecology courses have used the lowlands of Guanacaste Province, Costa Rica, as a natural laboratory. With the firm establishment of Santa Rosa National Park and various ...

Larvae of the bruchid beetle, Caryedes brasiliensis (Bruchidae) have the ability to avoid significant incorporation of L-canavanine, the guanidinooxy structural analog of L-arginine, into de novo synthesized proteins. ...

People are raJl)'lng In countries of the South as weU as the Nurth to preserve tropical rain forests. Tropical dry foresli. on the other hand. have excited and organized mucl! less public interest and con· cern. These ...