Effects of spatial variation in benthic phototrophs along a depth gradient on assessments of whole-lake processes

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dc.contributor.authorGushulak, Cale A. C.
dc.contributor.authorHaig, Heather A.
dc.contributor.authorKingsbury, Melanie V.
dc.contributor.authorWissel, Bjoern
dc.contributor.authorCumming, Brian F.
dc.contributor.authorLeavitt, Peter R.
dc.date.accessioned2023-05-11T14:41:35Z
dc.date.available2023-05-11T14:41:35Z
dc.date.issued2021-09-16
dc.descriptionThis is the peer reviewed version of the following article: Gushulak, C. A. C., Haig, H. A., Kingsbury, M. V., Wissel, B., Cumming, B. F., & Leavitt, P. R. (2021). Effects of spatial variation in benthic phototrophs along a depth gradient on assessments of whole-lake processes. Freshwater Biology, 66, 2118– 2132, which has been published in final form at https://doi.org/10.1111/fwb.13820. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.en_US
dc.description.abstract1. Phytobenthos are often underrepresented in both limnological and paleolimnological studies but may play key roles in whole-lake production and ecosystem processes including eutrophication, food-web dynamics, and ecosystem state changes. 2. Photosynthetic pigments, stables isotopes, and diatoms were quantified from surface sediments (0-1 cm) collected across a depth transect of a small, DOC-rich, mesotrophic lake in boreal northwestern Ontario to assess spatial variation in phytobenthos abundance and production. 3. Maximal concentrations of siliceous algae and cyanobacteria pigments occurred at ~2–6 m depth, with abundant tychoplanktonic diatoms, depleted sedimentary δ13C C values, and elevated 33 ratios of precursor chlorophyll a to product pheophytin a, all aligning well with the depths of the thermocline, epilimnetic mixing, and maximum light penetration. 4. These patterns demonstrated the presence of three discrete community assemblages, with greatest mass accumulation occurring at intermediate depths where warm illuminated sediments provide habitat for tychoplanktonic diatoms and cyanobacteria between turbulent shallows and cold and dark depths. 5. If widespread among boreal lakes, this tychoplanktonic zone may exert important effects on whole-lake production, carbon sequestration, benthic-pelagic food-web coupling, eutrophication, and ecosystem state change.en_US
dc.description.authorstatusFacultyen_US
dc.description.peerreviewyesen_US
dc.description.sponsorshipFunding for this project was provided through NSERC Discovery grants to PRL and BFC, an NSERC Collaborative Research Development grant in partnership with Manitoba Hydro, Canada Research Chair and Canada Foundation for Innovation programs, and scholarships to HAH and MVK.en_US
dc.identifier.citationGushulak, C. A. C., Haig, H. A., Kingsbury, M. V., Wissel, B., Cumming, B. F., & Leavitt, P. R. (2021). Effects of spatial variation in benthic phototrophs along a depth gradient on assessments of whole-lake processes. Freshwater Biology, 66, 2118– 2132. https://doi.org/10.1111/fwb.13820en_US
dc.identifier.doihttps://doi.org/10.1111/fwb.13820
dc.identifier.urihttps://hdl.handle.net/10294/15917
dc.language.isoenen_US
dc.publisherWileyen_US
dc.subjectphytobenthosen_US
dc.subjecttychoplanktonen_US
dc.subjectpigmenten_US
dc.subjectdiatomen_US
dc.subjectstable isotopeen_US
dc.titleEffects of spatial variation in benthic phototrophs along a depth gradient on assessments of whole-lake processesen_US
dc.typeArticleen_US
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