Methodological tests of a heterotrophy index for aquatic ecosystems
Experiments in glucose mineralization were carried out to investigate the effects caused by natural forcing functions on both the decomposition rates and heterotrophy capacity of aquatic ecosystems. In addition, the methodology used could show connections between mineralization rates measured in bot...
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ftdoajarticles:oai:doaj.org/article:29cf1496cc4142c4bf08849d073ca508 2023-05-15T15:52:54+02:00 Methodological tests of a heterotrophy index for aquatic ecosystems R. M. Antonio I. Bianchini Jr. https://doi.org/10.1590/S1519-69842003000300003 https://doaj.org/article/29cf1496cc4142c4bf08849d073ca508 EN eng Instituto Internacional de Ecologia http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842003000300003&lng=en&tlng=en https://doaj.org/toc/1678-4375 1678-4375 doi:10.1590/S1519-69842003000300003 https://doaj.org/article/29cf1496cc4142c4bf08849d073ca508 Brazilian Journal of Biology, Vol 63, Iss 3, Pp 373-380 decomposition mineralization heterotrophic capacity aerobic and anaerobic kinetics Science Q Biology (General) QH301-705.5 Zoology QL1-991 Botany QK1-989 article ftdoajarticles https://doi.org/10.1590/S1519-69842003000300003 2022-12-31T13:54:57Z Experiments in glucose mineralization were carried out to investigate the effects caused by natural forcing functions on both the decomposition rates and heterotrophy capacity of aquatic ecosystems. In addition, the methodology used could show connections between mineralization rates measured in both laboratory and field work with those measured in aquatic ecosystems. Water samples from Infernão lagoon (21º35'S and 47º51'W) were collected, filtered, enriched with glucose, and incubated under aerobic and anaerobic conditions. The glucose concentration variation, dissolved oxygen (DO) consumption, pH, electric conductivity, and total CO2 amount in the water were determined for sixteen days. In the period with intense oxygen consumption there was also an evident glucose demand and the dissolved oxygen consumption rate was approximately the same as that for glucose mineralization. The process in the aerobic chambers was 2.2 times faster than that in the anaerobic chambers. An initial acidification of the water samples, probably due to microbial carbonic acid liberation, was noted. A rise in pH values was also observed at the end of the process. The electric conductivity was low for both aerobic and anaerobic chambers, indicating a probable ion uptake by microbial organisms due to the presence of carbon sources. The glucose content variations corresponded to both CO2 formation and dissolved oxygen consumption. It was estimated that 19.4% of the initial glucose content turned into CO2 and the remaining 80.6% into humic compounds and microbial biomass. This experiment showed that glucose can be used as a substrate indicating the heterotrophy of a given aquatic ecosystem. Article in Journal/Newspaper Carbonic acid Directory of Open Access Journals: DOAJ Articles Brazilian Journal of Biology 63 3 373 380 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
decomposition mineralization heterotrophic capacity aerobic and anaerobic kinetics Science Q Biology (General) QH301-705.5 Zoology QL1-991 Botany QK1-989 |
spellingShingle |
decomposition mineralization heterotrophic capacity aerobic and anaerobic kinetics Science Q Biology (General) QH301-705.5 Zoology QL1-991 Botany QK1-989 R. M. Antonio I. Bianchini Jr. Methodological tests of a heterotrophy index for aquatic ecosystems |
topic_facet |
decomposition mineralization heterotrophic capacity aerobic and anaerobic kinetics Science Q Biology (General) QH301-705.5 Zoology QL1-991 Botany QK1-989 |
description |
Experiments in glucose mineralization were carried out to investigate the effects caused by natural forcing functions on both the decomposition rates and heterotrophy capacity of aquatic ecosystems. In addition, the methodology used could show connections between mineralization rates measured in both laboratory and field work with those measured in aquatic ecosystems. Water samples from Infernão lagoon (21º35'S and 47º51'W) were collected, filtered, enriched with glucose, and incubated under aerobic and anaerobic conditions. The glucose concentration variation, dissolved oxygen (DO) consumption, pH, electric conductivity, and total CO2 amount in the water were determined for sixteen days. In the period with intense oxygen consumption there was also an evident glucose demand and the dissolved oxygen consumption rate was approximately the same as that for glucose mineralization. The process in the aerobic chambers was 2.2 times faster than that in the anaerobic chambers. An initial acidification of the water samples, probably due to microbial carbonic acid liberation, was noted. A rise in pH values was also observed at the end of the process. The electric conductivity was low for both aerobic and anaerobic chambers, indicating a probable ion uptake by microbial organisms due to the presence of carbon sources. The glucose content variations corresponded to both CO2 formation and dissolved oxygen consumption. It was estimated that 19.4% of the initial glucose content turned into CO2 and the remaining 80.6% into humic compounds and microbial biomass. This experiment showed that glucose can be used as a substrate indicating the heterotrophy of a given aquatic ecosystem. |
format |
Article in Journal/Newspaper |
author |
R. M. Antonio I. Bianchini Jr. |
author_facet |
R. M. Antonio I. Bianchini Jr. |
author_sort |
R. M. Antonio |
title |
Methodological tests of a heterotrophy index for aquatic ecosystems |
title_short |
Methodological tests of a heterotrophy index for aquatic ecosystems |
title_full |
Methodological tests of a heterotrophy index for aquatic ecosystems |
title_fullStr |
Methodological tests of a heterotrophy index for aquatic ecosystems |
title_full_unstemmed |
Methodological tests of a heterotrophy index for aquatic ecosystems |
title_sort |
methodological tests of a heterotrophy index for aquatic ecosystems |
publisher |
Instituto Internacional de Ecologia |
url |
https://doi.org/10.1590/S1519-69842003000300003 https://doaj.org/article/29cf1496cc4142c4bf08849d073ca508 |
genre |
Carbonic acid |
genre_facet |
Carbonic acid |
op_source |
Brazilian Journal of Biology, Vol 63, Iss 3, Pp 373-380 |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842003000300003&lng=en&tlng=en https://doaj.org/toc/1678-4375 1678-4375 doi:10.1590/S1519-69842003000300003 https://doaj.org/article/29cf1496cc4142c4bf08849d073ca508 |
op_doi |
https://doi.org/10.1590/S1519-69842003000300003 |
container_title |
Brazilian Journal of Biology |
container_volume |
63 |
container_issue |
3 |
container_start_page |
373 |
op_container_end_page |
380 |
_version_ |
1766387990490251264 |