DIFFERENCES IN DRIFTING INVERTEBRATE COMMUNITIES ACROSS ARCTIC ECOZONES AND THE INFLUENCE ON POTENTIAL GROWTH OF GRAYLING (Thymallus arcticus)
Invertebrate drift is a key process that potentially affects multiple levels of food web organization within stream environments. However, our understanding of the mechanistic drivers of drift in high latitude streams and subsequent bottom-up control that drift may have on fish predators in these en...
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ftwlaurieruniv:oai:scholars.wlu.ca:etd-3711 2023-06-11T04:08:00+02:00 DIFFERENCES IN DRIFTING INVERTEBRATE COMMUNITIES ACROSS ARCTIC ECOZONES AND THE INFLUENCE ON POTENTIAL GROWTH OF GRAYLING (Thymallus arcticus) Chanyi, Charles 2023-01-01T08:00:00Z application/pdf https://scholars.wlu.ca/etd/2560 https://scholars.wlu.ca/context/etd/article/3711/viewcontent/CMChanyi_ThesisSubmission.pdf en eng Scholars Commons @ Laurier https://scholars.wlu.ca/etd/2560 https://scholars.wlu.ca/context/etd/article/3711/viewcontent/CMChanyi_ThesisSubmission.pdf 2 Publicly accessible Theses and Dissertations (Comprehensive) ecology arctic streams benthic drift bioenergetics Animal Sciences Biology Environmental Health Integrative Biology Other Ecology and Evolutionary Biology Population Biology Terrestrial and Aquatic Ecology text 2023 ftwlaurieruniv 2023-05-28T16:36:19Z Invertebrate drift is a key process that potentially affects multiple levels of food web organization within stream environments. However, our understanding of the mechanistic drivers of drift in high latitude streams and subsequent bottom-up control that drift may have on fish predators in these environments remains understudied. This project aimed to gain the baseline knowledge of how drift functions across two major high latitude ecozones, the boreal forest and tundra, and how those possible differences in drifting community characteristics may impact drift-feeding Arctic grayling (Thymallus arcticus). These objectives were accomplished by characterizing stream environments across both ecozones, sampling the benthic macroinvertebrate (BMI) community and drifting components of macroinvertebrate communities, and utilizing drift data in a drift feeding bioenergetics (DFBM) model to calculate potential tissue growth of Arctic grayling. Both benthic and drift compositions differed significantly based on ecozone. Abundances of BMI were 10 times greater in tundra streams. Nevertheless, drift densities between the two ecozones remained equal, suggesting drivers within boreal streams promoted active drift. Potential drivers of drift in boreal streams were higher benthic predator presence, and resource limitations due to significantly lower TDP and increased shading. Body size of drifting invertebrates did not differ between ecozones and, in combination with equal drift densities, produced no difference in potential growth of grayling. Potential growth of grayling differed by age-group, with grayling fry having higher growth potential than juveniles, suggesting the habitat of these smaller tributaries is not suitable for juveniles at this time of year (August 2021). Growth potential also differed significantly based on food resources. Benthic prey items provided the most growth potential across both ecozones. Potential growth derived from terrestrial and upstream lentic sources was significantly higher in boreal and ... Text Arctic grayling Arctic Thymallus arcticus Tundra Wilfrid Laurier University, Ontario: Scholars Commons@Laurier Arctic |
institution |
Open Polar |
collection |
Wilfrid Laurier University, Ontario: Scholars Commons@Laurier |
op_collection_id |
ftwlaurieruniv |
language |
English |
topic |
ecology arctic streams benthic drift bioenergetics Animal Sciences Biology Environmental Health Integrative Biology Other Ecology and Evolutionary Biology Population Biology Terrestrial and Aquatic Ecology |
spellingShingle |
ecology arctic streams benthic drift bioenergetics Animal Sciences Biology Environmental Health Integrative Biology Other Ecology and Evolutionary Biology Population Biology Terrestrial and Aquatic Ecology Chanyi, Charles DIFFERENCES IN DRIFTING INVERTEBRATE COMMUNITIES ACROSS ARCTIC ECOZONES AND THE INFLUENCE ON POTENTIAL GROWTH OF GRAYLING (Thymallus arcticus) |
topic_facet |
ecology arctic streams benthic drift bioenergetics Animal Sciences Biology Environmental Health Integrative Biology Other Ecology and Evolutionary Biology Population Biology Terrestrial and Aquatic Ecology |
description |
Invertebrate drift is a key process that potentially affects multiple levels of food web organization within stream environments. However, our understanding of the mechanistic drivers of drift in high latitude streams and subsequent bottom-up control that drift may have on fish predators in these environments remains understudied. This project aimed to gain the baseline knowledge of how drift functions across two major high latitude ecozones, the boreal forest and tundra, and how those possible differences in drifting community characteristics may impact drift-feeding Arctic grayling (Thymallus arcticus). These objectives were accomplished by characterizing stream environments across both ecozones, sampling the benthic macroinvertebrate (BMI) community and drifting components of macroinvertebrate communities, and utilizing drift data in a drift feeding bioenergetics (DFBM) model to calculate potential tissue growth of Arctic grayling. Both benthic and drift compositions differed significantly based on ecozone. Abundances of BMI were 10 times greater in tundra streams. Nevertheless, drift densities between the two ecozones remained equal, suggesting drivers within boreal streams promoted active drift. Potential drivers of drift in boreal streams were higher benthic predator presence, and resource limitations due to significantly lower TDP and increased shading. Body size of drifting invertebrates did not differ between ecozones and, in combination with equal drift densities, produced no difference in potential growth of grayling. Potential growth of grayling differed by age-group, with grayling fry having higher growth potential than juveniles, suggesting the habitat of these smaller tributaries is not suitable for juveniles at this time of year (August 2021). Growth potential also differed significantly based on food resources. Benthic prey items provided the most growth potential across both ecozones. Potential growth derived from terrestrial and upstream lentic sources was significantly higher in boreal and ... |
format |
Text |
author |
Chanyi, Charles |
author_facet |
Chanyi, Charles |
author_sort |
Chanyi, Charles |
title |
DIFFERENCES IN DRIFTING INVERTEBRATE COMMUNITIES ACROSS ARCTIC ECOZONES AND THE INFLUENCE ON POTENTIAL GROWTH OF GRAYLING (Thymallus arcticus) |
title_short |
DIFFERENCES IN DRIFTING INVERTEBRATE COMMUNITIES ACROSS ARCTIC ECOZONES AND THE INFLUENCE ON POTENTIAL GROWTH OF GRAYLING (Thymallus arcticus) |
title_full |
DIFFERENCES IN DRIFTING INVERTEBRATE COMMUNITIES ACROSS ARCTIC ECOZONES AND THE INFLUENCE ON POTENTIAL GROWTH OF GRAYLING (Thymallus arcticus) |
title_fullStr |
DIFFERENCES IN DRIFTING INVERTEBRATE COMMUNITIES ACROSS ARCTIC ECOZONES AND THE INFLUENCE ON POTENTIAL GROWTH OF GRAYLING (Thymallus arcticus) |
title_full_unstemmed |
DIFFERENCES IN DRIFTING INVERTEBRATE COMMUNITIES ACROSS ARCTIC ECOZONES AND THE INFLUENCE ON POTENTIAL GROWTH OF GRAYLING (Thymallus arcticus) |
title_sort |
differences in drifting invertebrate communities across arctic ecozones and the influence on potential growth of grayling (thymallus arcticus) |
publisher |
Scholars Commons @ Laurier |
publishDate |
2023 |
url |
https://scholars.wlu.ca/etd/2560 https://scholars.wlu.ca/context/etd/article/3711/viewcontent/CMChanyi_ThesisSubmission.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic grayling Arctic Thymallus arcticus Tundra |
genre_facet |
Arctic grayling Arctic Thymallus arcticus Tundra |
op_source |
Theses and Dissertations (Comprehensive) |
op_relation |
https://scholars.wlu.ca/etd/2560 https://scholars.wlu.ca/context/etd/article/3711/viewcontent/CMChanyi_ThesisSubmission.pdf |
op_rights |
2 Publicly accessible |
_version_ |
1768381105980833792 |