Seasonal resource limitation of heterotrophic biofilms in boreal streams.
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| Title: | Seasonal resource limitation of heterotrophic biofilms in boreal streams. |
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| Authors: | Burrows, Ryan M.1,2 r.burrows@griffith.edu.au, Laudon, Hjalmar1, McKie, Brendan G.3, Sponseller, Ryan A.4 |
| Source: | Limnology & Oceanography. Jan2017, Vol. 62 Issue 1, p164-176. 13p. |
| Subjects: | Biofilms -- Environmental aspects, Habitats, Freshwater ecology, Aquatic ecology, Environmental research |
| Abstract: | Unraveling the potentially shifting controls over microbial activity among habitats and across seasonal transitions is critical for understanding how freshwater ecosystems influence broader elemental cycles, and how these systems may respond to global changes. We used nutrient-diffusing substrates to investigate seasonal patterns and constraints on microbial activity of biofilms in streams draining distinct landscape features of the boreal biome (forests, mires, and lakes). Microbial respiration (MR) largely mirrored spatial and temporal variation in water temperature. However, limitation by labile carbon (C) was a constraint to microbial activity during ice-covered periods, when MR of control nutrient-diffusing substrates fell below rates predicted from stream temperature alone. Variation in C limitation among the study streams was reflective of putative organic C availability, with C limitation of biofilms weakest in the dissolved organic C (DOC)-rich, mire-outlet stream and greatest in the relatively DOC-poor, forest stream. Incidences of nutrient limitation were only observed during warmer months. Our study illustrates how variation in processes mediated by heterotrophic biofilms and seasonal shifts in resource limitation can emerge in a stream network draining a heterogeneous landscape. In addition, our results show that, for a large portion of the year, heterotrophic processes in boreal streams can be strongly limited by the availability of labile C, despite high DOC concentrations. Metabolic constraints to dissolved organic matter processing at near-freezing temperatures, coupled with hydrological controls over the delivery of more labile organic resources to streams (e.g., soil freezing and flooding), have potentially strong influences on the productivity of boreal streams. [ABSTRACT FROM AUTHOR] |
| Copyright of Limnology & Oceanography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 120659896 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Seasonal resource limitation of heterotrophic biofilms in boreal streams. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Burrows%2C+Ryan+M%2E%22">Burrows, Ryan M.</searchLink><relatesTo>1,2</relatesTo><i> r.burrows@griffith.edu.au</i><br /><searchLink fieldCode="AR" term="%22Laudon%2C+Hjalmar%22">Laudon, Hjalmar</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22McKie%2C+Brendan+G%2E%22">McKie, Brendan G.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Sponseller%2C+Ryan+A%2E%22">Sponseller, Ryan A.</searchLink><relatesTo>4</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Limnology+%26+Oceanography%22">Limnology & Oceanography</searchLink>. Jan2017, Vol. 62 Issue 1, p164-176. 13p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Biofilms+--+Environmental+aspects%22">Biofilms -- Environmental aspects</searchLink><br /><searchLink fieldCode="DE" term="%22Habitats%22">Habitats</searchLink><br /><searchLink fieldCode="DE" term="%22Freshwater+ecology%22">Freshwater ecology</searchLink><br /><searchLink fieldCode="DE" term="%22Aquatic+ecology%22">Aquatic ecology</searchLink><br /><searchLink fieldCode="DE" term="%22Environmental+research%22">Environmental research</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Unraveling the potentially shifting controls over microbial activity among habitats and across seasonal transitions is critical for understanding how freshwater ecosystems influence broader elemental cycles, and how these systems may respond to global changes. We used nutrient-diffusing substrates to investigate seasonal patterns and constraints on microbial activity of biofilms in streams draining distinct landscape features of the boreal biome (forests, mires, and lakes). Microbial respiration (MR) largely mirrored spatial and temporal variation in water temperature. However, limitation by labile carbon (C) was a constraint to microbial activity during ice-covered periods, when MR of control nutrient-diffusing substrates fell below rates predicted from stream temperature alone. Variation in C limitation among the study streams was reflective of putative organic C availability, with C limitation of biofilms weakest in the dissolved organic C (DOC)-rich, mire-outlet stream and greatest in the relatively DOC-poor, forest stream. Incidences of nutrient limitation were only observed during warmer months. Our study illustrates how variation in processes mediated by heterotrophic biofilms and seasonal shifts in resource limitation can emerge in a stream network draining a heterogeneous landscape. In addition, our results show that, for a large portion of the year, heterotrophic processes in boreal streams can be strongly limited by the availability of labile C, despite high DOC concentrations. Metabolic constraints to dissolved organic matter processing at near-freezing temperatures, coupled with hydrological controls over the delivery of more labile organic resources to streams (e.g., soil freezing and flooding), have potentially strong influences on the productivity of boreal streams. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Limnology & Oceanography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/lno.10383 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 13 StartPage: 164 Subjects: – SubjectFull: Biofilms -- Environmental aspects Type: general – SubjectFull: Habitats Type: general – SubjectFull: Freshwater ecology Type: general – SubjectFull: Aquatic ecology Type: general – SubjectFull: Environmental research Type: general Titles: – TitleFull: Seasonal resource limitation of heterotrophic biofilms in boreal streams. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Burrows, Ryan M. – PersonEntity: Name: NameFull: Laudon, Hjalmar – PersonEntity: Name: NameFull: McKie, Brendan G. – PersonEntity: Name: NameFull: Sponseller, Ryan A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 01 Text: Jan2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 00243590 Numbering: – Type: volume Value: 62 – Type: issue Value: 1 Titles: – TitleFull: Limnology & Oceanography Type: main |
| ResultId | 1 |
