Weevil Diversity and Seasonality in Tropical Panama as Deduced from Light-TrapCatches ('Coleoptera: Curculionoidea)

摘要

Weevils were collected with light traps at seven localities in the Republic ofPanama, varying in altitude from sea level to 2200 m, in climate from sharply seasonaly to virtually nonseasonal, and in habitat from natural tropical forest to areas strongly disturbed by humans. Although only an estimated 25-40 percent of the species of weevils present in an area were attracted to light, a total of 2086 species was nonetheless obtained in the traps. On Barro Colorado Island (BCI), the canopy trap caught more individuals but fewer species than the trap near the ground. Species richness (alpha-diversity) varied greatly between sites, BCI being the richest and the high-altitude site of Guadalupe Arriba being the poorest. Using the logseries as an arbitrary but useful basis for comparison, there were too many rare species and too few species of intermediate abundances at all sites. Between-site (beta-) diversity was also large, with one-third to two-thirds of the species at each site being only observed at that site, whereas species occurring at four or more sites were very rare.