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Leaf-cutter ants engineer large nitrous oxide hot spots in tropical forests.
Soper, Fiona M; Sullivan, Benjamin W; Osborne, Brooke B; Shaw, Alanna N; Philippot, Laurent; Cleveland, Cory C.
Afiliação
  • Soper FM; 1 Department of Ecosystem and Conservation Sciences, W. A. Franke College of Forestry and Conservation, University of Montana , Missoula, MT 59812 , USA.
  • Sullivan BW; 2 Department of Natural Resources and Environmental Science, University of Nevada , Reno, NV 89557 , USA.
  • Osborne BB; 3 Department of Ecology and Evolutionary Biology, Brown University , Providence, RI 02912 , USA.
  • Shaw AN; 1 Department of Ecosystem and Conservation Sciences, W. A. Franke College of Forestry and Conservation, University of Montana , Missoula, MT 59812 , USA.
  • Philippot L; 4 INRA , UMR 1347 Agroécologie, Dijon , France.
  • Cleveland CC; 1 Department of Ecosystem and Conservation Sciences, W. A. Franke College of Forestry and Conservation, University of Montana , Missoula, MT 59812 , USA.
Proc Biol Sci ; 286(1894): 20182504, 2019 01 16.
Article em En | MEDLINE | ID: mdl-30963857
Though tropical forest ecosystems are among the largest natural sources of the potent greenhouse gas nitrous oxide (N2O), the spatial distribution of emissions across landscapes is often poorly resolved. Leaf cutter ants (LCA; Atta and Acromyrmex, Myrmicinae) are dominant herbivores throughout Central and South America, and influence multiple aspects of forest structure and function. In particular, their foraging creates spatial heterogeneity by concentrating large quantities of organic matter (including nitrogen, N) from the surrounding canopy into their colonies, and ultimately into colony refuse dumps. Here, we demonstrate that refuse piles created by LCA species Atta colombica in tropical rainforests of Costa Rica provide ideal conditions for extremely high rates of N2O production (high microbial biomass, potential denitrification enzyme activity, N content and anoxia) and may represent an unappreciated source of heterogeneity in tropical forest N2O emissions. Average instantaneous refuse pile N2O fluxes surpassed background emissions by more than three orders of magnitude (in some cases exceeding 80 000 µg N2O-N m-2 h-1) and generating fluxes comparable to or greater than those produced by engineered systems such as wastewater treatment tanks. Refuse-concentrating Atta species are ubiquitous in tropical forests, pastures and production ecosystems, and increase density strongly in response to disturbance. As such, LCA colonies may represent an unrecognized greenhouse gas point source throughout the Neotropics.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Formigas / Solo / Floresta Úmida / Óxido Nitroso Limite: Animals País/Região como assunto: America central / Costa rica Idioma: En Revista: Proc Biol Sci Assunto da revista: BIOLOGIA Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Reino Unido
Texto completo
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XML
PubMed Links
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Formigas / Solo / Floresta Úmida / Óxido Nitroso Limite: Animals País/Região como assunto: America central / Costa rica Idioma: En Revista: Proc Biol Sci Assunto da revista: BIOLOGIA Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Estados Unidos País de publicação: Reino Unido