Seaonal effects of anthills of Camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from Argentina

Ánts are important sources of soil disturbance and have often been considered ecosystem engineers. The physical and chemical changes produced by these insects may affect soil microorganisms. Camponotus punctulatus, a native ant species in Argentina, builds large soil nests called tacurúes, after agr...

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Detalles Bibliográficos
Autores principales: Gonzalez-Polo, M., Folgarait, P.J., Martínez, A.
Formato: JOUR
Materias:
Ants
Litter decomposotion
Northeaster Argentine
Setaria sphacelata
Soil enzymes
microbial activity
Argentina
South America
Western Hemisphere
World
Argentina (fish)
Bacteria (microorganisms)
Camponotus punctulatus
Formicidae
Hexapoda
Insecta
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03275477_v14_n2_p149_GonzalezPolo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03275477_v14_n2_p149_GonzalezPolo
record_format dspace
spelling todo:paper_03275477_v14_n2_p149_GonzalezPolo2023-10-03T15:24:44Z Seaonal effects of anthills of Camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from Argentina Gonzalez-Polo, M. Folgarait, P.J. Martínez, A. Ants Litter decomposotion Northeaster Argentine Setaria sphacelata Soil enzymes microbial activity Argentina South America Western Hemisphere World Argentina (fish) Bacteria (microorganisms) Camponotus punctulatus Formicidae Hexapoda Insecta Setaria sphacelata Ánts are important sources of soil disturbance and have often been considered ecosystem engineers. The physical and chemical changes produced by these insects may affect soil microorganisms. Camponotus punctulatus, a native ant species in Argentina, builds large soil nests called tacurúes, after agriculture disturbance. Soil nutrient concentrations in anthills are greater in comparison to control soils. We hypothesized that the higher concentration of soil nutrients may be due to increased decomposition and mineralization because of the greater abundance and activity of microorganisms in the anthill. We also hypothesized that microbial biomass and activity should be greater at warmer and wet season. We collected six paired soil samples (on and off the anthill) throughout one year at five different times from a sown pasture of Setaria sphacelata in Corrientes, Argentina. At the beginning of each soil-sampling period, we buried litterbags (1 μm mesh) with Setaria sphacelata and removed the buried ones from last sampling period. From soil samples, we quantified microbial biomass by the fumigation-incubation technique, whereas microbial activity was measured by dehydrogenase (total and fungal) and cellulase activity, and microbial decomposition was quantified from litterbags. Principal Components Analysis indicated that anthills were characterized by lower microbial activity at all sample periods throughout the year. However, decomposition was significantly higher in anthills during January-April and April-July, despite a lower microbial activity and biomass. The comparison between total and fungal dehydrogenase activity showed a significantly higher bacterial activity on anthills. Microorganism biomass and activity, as well as decomposition, changed throughout the year according to seasonal variations in temperature and precipitation. The peak of microbial activity was recorded in January, whereas the greatest microbial biomass was observed during the winter months. Decomposition was positively correlated with dehydrogenase and cellulase activity, but negatively correlated with microbial biomass at both microsites. Our results suggest that microbial biomass reflects mainly inactive microorganisms (because of the significant negative correlation with decomposition), whereas dehydrogenase activity is proposed as a good indicator of active soil microbial status. The greater proportion of bacterial activity in the anthill could help to explain (among others possibilities that are discussed) the enhancement of nutrients at this microsite, although more studies are needed in this regard. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03275477_v14_n2_p149_GonzalezPolo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Ants
Litter decomposotion
Northeaster Argentine
Setaria sphacelata
Soil enzymes
microbial activity
Argentina
South America
Western Hemisphere
World
Argentina (fish)
Bacteria (microorganisms)
Camponotus punctulatus
Formicidae
Hexapoda
Insecta
Setaria sphacelata
spellingShingle Ants
Litter decomposotion
Northeaster Argentine
Setaria sphacelata
Soil enzymes
microbial activity
Argentina
South America
Western Hemisphere
World
Argentina (fish)
Bacteria (microorganisms)
Camponotus punctulatus
Formicidae
Hexapoda
Insecta
Setaria sphacelata
Gonzalez-Polo, M.
Folgarait, P.J.
Martínez, A.
Seaonal effects of anthills of Camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from Argentina
topic_facet Ants
Litter decomposotion
Northeaster Argentine
Setaria sphacelata
Soil enzymes
microbial activity
Argentina
South America
Western Hemisphere
World
Argentina (fish)
Bacteria (microorganisms)
Camponotus punctulatus
Formicidae
Hexapoda
Insecta
Setaria sphacelata
description Ánts are important sources of soil disturbance and have often been considered ecosystem engineers. The physical and chemical changes produced by these insects may affect soil microorganisms. Camponotus punctulatus, a native ant species in Argentina, builds large soil nests called tacurúes, after agriculture disturbance. Soil nutrient concentrations in anthills are greater in comparison to control soils. We hypothesized that the higher concentration of soil nutrients may be due to increased decomposition and mineralization because of the greater abundance and activity of microorganisms in the anthill. We also hypothesized that microbial biomass and activity should be greater at warmer and wet season. We collected six paired soil samples (on and off the anthill) throughout one year at five different times from a sown pasture of Setaria sphacelata in Corrientes, Argentina. At the beginning of each soil-sampling period, we buried litterbags (1 μm mesh) with Setaria sphacelata and removed the buried ones from last sampling period. From soil samples, we quantified microbial biomass by the fumigation-incubation technique, whereas microbial activity was measured by dehydrogenase (total and fungal) and cellulase activity, and microbial decomposition was quantified from litterbags. Principal Components Analysis indicated that anthills were characterized by lower microbial activity at all sample periods throughout the year. However, decomposition was significantly higher in anthills during January-April and April-July, despite a lower microbial activity and biomass. The comparison between total and fungal dehydrogenase activity showed a significantly higher bacterial activity on anthills. Microorganism biomass and activity, as well as decomposition, changed throughout the year according to seasonal variations in temperature and precipitation. The peak of microbial activity was recorded in January, whereas the greatest microbial biomass was observed during the winter months. Decomposition was positively correlated with dehydrogenase and cellulase activity, but negatively correlated with microbial biomass at both microsites. Our results suggest that microbial biomass reflects mainly inactive microorganisms (because of the significant negative correlation with decomposition), whereas dehydrogenase activity is proposed as a good indicator of active soil microbial status. The greater proportion of bacterial activity in the anthill could help to explain (among others possibilities that are discussed) the enhancement of nutrients at this microsite, although more studies are needed in this regard.
format JOUR
author Gonzalez-Polo, M.
Folgarait, P.J.
Martínez, A.
author_facet Gonzalez-Polo, M.
Folgarait, P.J.
Martínez, A.
author_sort Gonzalez-Polo, M.
title Seaonal effects of anthills of Camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from Argentina
title_short Seaonal effects of anthills of Camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from Argentina
title_full Seaonal effects of anthills of Camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from Argentina
title_fullStr Seaonal effects of anthills of Camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from Argentina
title_full_unstemmed Seaonal effects of anthills of Camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from Argentina
title_sort seaonal effects of anthills of camponotus punctulatus on the microbial biomass and activity in a subtropical pasture from argentina
url http://hdl.handle.net/20.500.12110/paper_03275477_v14_n2_p149_GonzalezPolo
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AT folgaraitpj seaonaleffectsofanthillsofcamponotuspunctulatusonthemicrobialbiomassandactivityinasubtropicalpasturefromargentina
AT martineza seaonaleffectsofanthillsofcamponotuspunctulatusonthemicrobialbiomassandactivityinasubtropicalpasturefromargentina
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