Resource use by macroinvertebrates within boreal stream food webs
Stream food webs are supported by carbon produced within the stream (autochthonous) and from terrestrial environments (allochthonous). Allochthonous carbon (C) inputs are assumed to be the dominant C source supporting food webs within small streams, but few direct estimates of resource use in small...
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
2015
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ftumeauniv:oai:DiVA.org:umu-105593 2024-09-15T18:26:11+00:00 Resource use by macroinvertebrates within boreal stream food webs Landström, Emelie 2015 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105593 eng eng UmeÃ¥ universitet, Institutionen för ekologi, miljö och geovetenskap http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105593 info:eu-repo/semantics/openAccess Allochthonous Autochthonous Food webs Boreal Streams Deuterium Carbon Ecology Ekologi Student thesis info:eu-repo/semantics/bachelorThesis text 2015 ftumeauniv 2024-09-03T04:31:37Z Stream food webs are supported by carbon produced within the stream (autochthonous) and from terrestrial environments (allochthonous). Allochthonous carbon (C) inputs are assumed to be the dominant C source supporting food webs within small streams, but few direct estimates of resource use in small streams have been made, especially in boreal streams. The objective of this study was to determine the relative dependence on allochthonous and autochthonous C by consumers in relation to C pools within streams with high terrestrial inputs. Furthermore, this study aimed to investigate if the relative resource use of allochthonous and autochthonous C by consumers differed among seasons (summer and fall), between streams of different sizes, and locations within the catchment. To estimate consumer resource use, δ2H signatures for organic C sources were compared to those of six key consumers in five streams of varying catchment sizes in northern Sweden. Macroinvertebrate biomass was quantified to calculate a taxa-specific biomass-weighted allochthony, and compared with the mass of different C pools potentially available for consumers. The biomass-weighted mean allochthony for all samplings ranged between 43.5-61.5%; there was thus high autochthonous support despite low algal density and high terrestrial C pools within the streams. No significant trend in allochthony was observed over season (linear regression, p-value >0.05). Allochthony differed by invertebrate taxa and was not related to stream size or location in catchment. These results suggest that autochthonous C is far more important for consumers in boreal streams than previously recognized. Bachelor Thesis Northern Sweden Umeå University: Publications (DiVA) |
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Open Polar |
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Umeå University: Publications (DiVA) |
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ftumeauniv |
language |
English |
topic |
Allochthonous Autochthonous Food webs Boreal Streams Deuterium Carbon Ecology Ekologi |
spellingShingle |
Allochthonous Autochthonous Food webs Boreal Streams Deuterium Carbon Ecology Ekologi Landström, Emelie Resource use by macroinvertebrates within boreal stream food webs |
topic_facet |
Allochthonous Autochthonous Food webs Boreal Streams Deuterium Carbon Ecology Ekologi |
description |
Stream food webs are supported by carbon produced within the stream (autochthonous) and from terrestrial environments (allochthonous). Allochthonous carbon (C) inputs are assumed to be the dominant C source supporting food webs within small streams, but few direct estimates of resource use in small streams have been made, especially in boreal streams. The objective of this study was to determine the relative dependence on allochthonous and autochthonous C by consumers in relation to C pools within streams with high terrestrial inputs. Furthermore, this study aimed to investigate if the relative resource use of allochthonous and autochthonous C by consumers differed among seasons (summer and fall), between streams of different sizes, and locations within the catchment. To estimate consumer resource use, δ2H signatures for organic C sources were compared to those of six key consumers in five streams of varying catchment sizes in northern Sweden. Macroinvertebrate biomass was quantified to calculate a taxa-specific biomass-weighted allochthony, and compared with the mass of different C pools potentially available for consumers. The biomass-weighted mean allochthony for all samplings ranged between 43.5-61.5%; there was thus high autochthonous support despite low algal density and high terrestrial C pools within the streams. No significant trend in allochthony was observed over season (linear regression, p-value >0.05). Allochthony differed by invertebrate taxa and was not related to stream size or location in catchment. These results suggest that autochthonous C is far more important for consumers in boreal streams than previously recognized. |
format |
Bachelor Thesis |
author |
Landström, Emelie |
author_facet |
Landström, Emelie |
author_sort |
Landström, Emelie |
title |
Resource use by macroinvertebrates within boreal stream food webs |
title_short |
Resource use by macroinvertebrates within boreal stream food webs |
title_full |
Resource use by macroinvertebrates within boreal stream food webs |
title_fullStr |
Resource use by macroinvertebrates within boreal stream food webs |
title_full_unstemmed |
Resource use by macroinvertebrates within boreal stream food webs |
title_sort |
resource use by macroinvertebrates within boreal stream food webs |
publisher |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2015 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105593 |
genre |
Northern Sweden |
genre_facet |
Northern Sweden |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-105593 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1810466632899756032 |