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Stream diatom assem...
Stream diatom assemblages in an arctic catchment : Diversity and relationship to ecosystem-scale primary production
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- Riley, Breena (author)
- Department of Biology, Tarleton State University, TX, Stephenville, United States
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- Seekell, David A. (author)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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(creator_code:org_t)
- NRC Research Press, 2021
- 2021
- English.
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In: Arctic Science. - : NRC Research Press. - 2368-7460. ; 7:4, s. 762-780
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Abstract
Subject headings
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- We quantified benthic diatom diversity in streams in the Miellajokka catchment, about 200 km north of the Arctic circle in Sweden. Beta diversity among sites was related to local-scale environmental heterogeneity (occurring on the order of 1 km or less), and its magnitude was equal (Sørensen Index = 0.62) to levels previously reported for rivers on regional environmental gradients across hundreds of kilometres of Arctic Fennoscandia. Species turnover was the dominant (77%) component of beta diversity in the Miellajokka catchment. Small, stress-tolerant taxa dominated the assemblages, and there were no clear patterns of functional class among sites. Site ordinates from non-metric dimensional scaling were most strongly correlated with flood frequency (r = 0.83) and water temperature (r = 0.89), which was higher in harsh tundra sites than below treeline. Additionally, site ordinates were correlated (r = 0.83) with ecosystem-scale gross primary production — indicative of a link between diatom diversity and ecosystem function. Our results advance understanding of patterns diatom diversity in Arctic streams by quantifying local-scale variation that is understudied in this region, and by identifying the consequences of this local-scale diversity for an ecosystem-scale process.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
Keyword
- Arctic rivers
- Beta diversity
- Diatoms
- Environmental filtering
- Gross primary production
Publication and Content Type
- ref (subject category)
- art (subject category)
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