Increased CO2 emission and organic matter decomposition by leaf-cutting ant nests in a coastal environment

Author(s)

Sousa-Souto, Leandro ^{[1, 2]} ; de Jesus Santos, Danielle Caroline ^[1] ; Ambrogi, Bianca Giuliano ^[1] ; Campos dos Santos, Mario Jorge ^[3] ; Bueno Guerra, Marcelo Braga ^[4] ; Pereira-Filho, Edenir Rodrigues ^[4]

Affiliation

^[1] Univ Fed Sergipe, Entomol Lab, BR-49100000 Sergipe - Brazil

^[2] Univ Fed Sergipe, Nucleo Grad Ecol, BR-49100000 Sergipe - Brazil

^[3] Univ Fed Sergipe, Dept Ciencias Florestais, BR-49100000 Sergipe - Brazil

^[4] Univ Fed Sao Carlos, Dept Quim, GAIA, BR-13600940 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: SOIL BIOLOGY & BIOCHEMISTRY; v. 44, n. 1, p. 21-25, JAN 2012.
• Web of Science Citations: 16

Abstract

Leaf-cutting ants perform a vital role in the cycling of carbon and nutrients in tropical ecosystems. Nests have high levels of organic matter and refuse dumps host up to two times more soil micro-organisms than non-nest soil. The increased levels of organic matter in the soil of nests, however, can affect CO2 emissions from soil and alter the balance of atmospheric CO2. We aimed at assessing the effect of nests of the leaf-cutting ant Acromyrmex balzani on CO2 emissions in a coastal area of Northeast Brazil. Results show that A. balzani nests emitted up to four times more CO2 than the surrounding soil and emissions were positively correlated with soil moisture and soil organic matter (SOM) content. In addition, field experiments demonstrated that refuse material has a lower residence time than the leaf material brought to the colonies. Despite the high density of nests and high content of SOM compared to adjacent control soil. CO2 emissions by A. balzani nests represent only 0.3% of the total CO2 efflux by the studied ecosystem. Although these effluxes account for a relative small portion of the total soil CO2 emission, they are still important for the understanding of C balance, especially when one considers the thousands of tons of CO2 emitted each day, across entire Neotropical regions where leaf-cutting ants occur. (C) 2011 Elsevier Ltd. All rights reserved. (AU)

• FAPESP's process: 08/08260-3 - Chemical analyses of environmental samples from Antartica: spectrometric determination of Cd, Cr, Ni and Pb, use of micro X-Ray fluorescence with synchrotron radiation and application of chemometric tools
• Grantee: Marcelo Braga Bueno Guerra
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)