A new article by Kenneth Feeley from Florida International University, with STRI’s Stuart J. Davies, Rolando Perez and Stephen P. Hubbell and former staff scientist Robin B. Foster (now at the Field Museum, Chicago), was recently published as the cover article of the journal Ecology (April).
The article, entitled “Directional changes in the species composition of a tropical forest”, examines changes in the composition of tree species growing on Barro Colorado Island, Panama, R,P.
Feeley and colleagues show that over the past 25 years there has been a remarkably consistent and directional pattern of increasing abundances of drought-tolerant species at the expense of more drought-insensitive tree species. The cause(s) of this change remains uncertain, but the most likely culprits are either long-term changes in climate leading to reduced water availability (i.e., increasing temperatures and reduced rainfall), or alternatively the compositional changes may be the ongoing legacy of an extreme El Nino drought that occurred in the early 1980’s.
By investigating compositional changes, scientists increase not only their understanding of the ecology of tropical forests and their responses to large-scale disturbances, but also their ability to predict how future global change will impact some of the critical services provided by ecosystems as important as those of the Panama Canal watershed.
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