期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 115, 期 44, 页码 E10397-E10406出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1722477115
关键词
climate warming; rainforest; food web; arthropods; bottom-up cascade
资金
- Department of Biological Sciences at Rensselaer Polytechnic Institute
- graduate program in the biological sciences at the Instituto de Biologia, Universidad Nacional Autonoma de Mexico
- Estacion de Biologia Chamela of the Instituto de Biologia-Universidad Nacional Autonoma de Mexico
- National Science Foundation [1038013]
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1038013] Funding Source: National Science Foundation
A number of studies indicate that tropical arthropods should be particularly vulnerable to climate warming. If these predictions are realized, climate warming may have a more profound impact on the functioning and diversity of tropical forests than currently anticipated. Although arthropods comprise over two-thirds of terrestrial species, information on their abundance and extinction rates in tropical habitats is severely limited. Here we analyze data on arthropod and insectivore abundances taken between 1976 and 2012 at two midelevation habitats in Puerto Rico's Luquillo rainforest. During this time, mean maximum temperatures have risen by 2.0 degrees C. Using the same study area and methods employed by Lister in the 1970s, we discovered that the dry weight biomass of arthropods captured in sweep samples had declined 4 to 8 times, and 30 to 60 times in sticky traps. Analysis of long-term data on canopy arthropods and walking sticks taken as part of the Luquillo Long-Term Ecological Research program revealed sustained declines in abundance over two decades, as well as negative regressions of abundance on mean maximum temperatures. We also document parallel decreases in Luquillo's insectivorous lizards, frogs, and birds. While El Nino/Southern Oscillation influences the abundance of forest arthropods, climate warming is the major driver of reductions in arthropod abundance, indirectly precipitating a bottom-up trophic cascade and consequent collapse of the forest food web.
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