A new study from the rainforests of Panama provides an unprecedented level of detail regarding the diversity and distribution of arthropod species from the soil to the forest canopy. Yves Basset, scientific coordinator of the CTFS Arthropod Initiative at the Smithsonian Tropical Research Institute, led an international team on Project IBISCA-Panama to sample, sort, catalogue, and finally estimate that a 6,000 hectare forest hosts a total of around 25,000 arthropod species a figure vastly outnumbering that of better-studied organisms. The study will be published online on Dec. 13 in the journal Science.
Most multicellular species on Earth are arthropods living in tropical forests. Yet, given the difficulties involved in merely tallying them, we know very little about their exact numbers even at the scale of a single forest. A massive collaborative effort involving 102 researchers from 21 countries was necessary to collect and identify arthropods from all parts of the rainforest. During 2003-2004, the field team spent an effort of nearly 70 person- or trap-years in sampling the rainforest canopy from a construction crane, inflatable platforms, balloons, climbing ropes through forest layers, as well as crawling along the forest floor to sift soil, and trap and bait arthropods. During the ensuing eight years, the team sorted and identified 130,000 arthropods, to a total of more than 6,000 species.
By scaling up the diversity values obtained from twelve intensively-sampled sites, the team was able to calculate that the rainforest reserve harbors in excess of 25,000 arthropod species. "This is a high number as it implies that for every species of vascular plant, bird or mammal in this forest, you will find 20, 83 and 312 species of arthropods, respectively," explains Basset. "If we are interested in conserving the diversity of life on Earth, we should start thinking about how best to conserve arthropods," adds Tomas Roslin from the University of Helsi
|Contact: Beth King|
Smithsonian Tropical Research Institute