Doc-haltens påverkan på bentiska bakteriers tillväxt : En studie i svenska nordliga sjöar
Allochthonous organic carbon is increasing and leading to browning of freshwaters in the northern hemisphere. It is already known that an increase in allochthonous dissolved organic carbon (DOC) affects benthic primary production and respiration negatively via light limitation, however, little is kn...
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
2021
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ftumeauniv:oai:DiVA.org:umu-184087 2023-10-09T21:54:34+02:00 Doc-haltens påverkan på bentiska bakteriers tillväxt : En studie i svenska nordliga sjöar Öjebrandt, Anna 2021 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184087 swe swe Umeå universitet, Institutionen för ekologi, miljö och geovetenskap http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184087 info:eu-repo/semantics/openAccess Dissolved organic carbon DOC brownification benthic bacteria Natural Sciences Naturvetenskap Student thesis info:eu-repo/semantics/bachelorThesis text 2021 ftumeauniv 2023-09-22T13:53:58Z Allochthonous organic carbon is increasing and leading to browning of freshwaters in the northern hemisphere. It is already known that an increase in allochthonous dissolved organic carbon (DOC) affects benthic primary production and respiration negatively via light limitation, however, little is known about the impact on benthic bacteria. This report aims at examining how DOC and other environmental variables affect the production and growth of benthic bacteria. This was done by analyzing data from 18 lakes in northern Sweden with different DOC concentrations. This analysis was divided into two datasets: one including data at the whole lake scale and the other including data over depth within the lakes. The result showed that DOC, average depth, and the light extinction coefficient all had a negative impact on bacterial production on a whole lake scale. The light extinction coefficient was also affecting the whole lake bacterial growth efficiency (BGE) negatively. Over depth within the lakes a higher light input increased the bacterial production. In the same dataset, light was also affecting the BGE positively, while temperature had a negative effect. The results can thus be linked to the increase in allochthonous carbon and brownification. Because allochthonous DOC have a negative effect on benthic primary production, there will be less autochthonous DOC available for benthic bacteria. Allochthonous DOC is considered less degradable than autochthonous DOC. The increase in allochthonous DOC therefore has a negative impact on benthic bacterial production, likely connected to a decrease in production of autochthonous DOC by benthic algae. Bachelor Thesis Northern Sweden Umeå University: Publications (DiVA) Browning ENVELOPE(164.050,164.050,-74.617,-74.617) |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
Swedish |
topic |
Dissolved organic carbon DOC brownification benthic bacteria Natural Sciences Naturvetenskap |
spellingShingle |
Dissolved organic carbon DOC brownification benthic bacteria Natural Sciences Naturvetenskap Öjebrandt, Anna Doc-haltens påverkan på bentiska bakteriers tillväxt : En studie i svenska nordliga sjöar |
topic_facet |
Dissolved organic carbon DOC brownification benthic bacteria Natural Sciences Naturvetenskap |
description |
Allochthonous organic carbon is increasing and leading to browning of freshwaters in the northern hemisphere. It is already known that an increase in allochthonous dissolved organic carbon (DOC) affects benthic primary production and respiration negatively via light limitation, however, little is known about the impact on benthic bacteria. This report aims at examining how DOC and other environmental variables affect the production and growth of benthic bacteria. This was done by analyzing data from 18 lakes in northern Sweden with different DOC concentrations. This analysis was divided into two datasets: one including data at the whole lake scale and the other including data over depth within the lakes. The result showed that DOC, average depth, and the light extinction coefficient all had a negative impact on bacterial production on a whole lake scale. The light extinction coefficient was also affecting the whole lake bacterial growth efficiency (BGE) negatively. Over depth within the lakes a higher light input increased the bacterial production. In the same dataset, light was also affecting the BGE positively, while temperature had a negative effect. The results can thus be linked to the increase in allochthonous carbon and brownification. Because allochthonous DOC have a negative effect on benthic primary production, there will be less autochthonous DOC available for benthic bacteria. Allochthonous DOC is considered less degradable than autochthonous DOC. The increase in allochthonous DOC therefore has a negative impact on benthic bacterial production, likely connected to a decrease in production of autochthonous DOC by benthic algae. |
format |
Bachelor Thesis |
author |
Öjebrandt, Anna |
author_facet |
Öjebrandt, Anna |
author_sort |
Öjebrandt, Anna |
title |
Doc-haltens påverkan på bentiska bakteriers tillväxt : En studie i svenska nordliga sjöar |
title_short |
Doc-haltens påverkan på bentiska bakteriers tillväxt : En studie i svenska nordliga sjöar |
title_full |
Doc-haltens påverkan på bentiska bakteriers tillväxt : En studie i svenska nordliga sjöar |
title_fullStr |
Doc-haltens påverkan på bentiska bakteriers tillväxt : En studie i svenska nordliga sjöar |
title_full_unstemmed |
Doc-haltens påverkan på bentiska bakteriers tillväxt : En studie i svenska nordliga sjöar |
title_sort |
doc-haltens påverkan på bentiska bakteriers tillväxt : en studie i svenska nordliga sjöar |
publisher |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2021 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184087 |
long_lat |
ENVELOPE(164.050,164.050,-74.617,-74.617) |
geographic |
Browning |
geographic_facet |
Browning |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-184087 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1779318182873399296 |