Taylor H. Leach, Beatrix E. Beisner, Cayelan C. Carey, Patricia Pernica, Kevin C. Rose, Yannick Huot, Jennifer A. Brentrup, Isabelle Domaizon, Hans-Peter Grossart, Bastiaan W. Ibelings, Stephan Jacquet, Patrick T. Kelly, James A. Rusak, Jason D. Stockwell, Dietmar Straile, Piet Verburg
- The vertical distribution of chlorophyll in stratified lakes and reservoirs frequently exhibits a maximum peak deep in the water column, referred to as the deep chlorophyll maximum (DCM). DCMs are ecologically important hot spots of primary production and nutrient cycling, and their location can determine vertical habitat gradients for primary consumers. Consequently, the drivers of DCM structure regulate many characteristics of aquatic food webs and biogeochemistry. Previous studies have identified light and thermal stratification as important drivers of summer DCM depth, but their relative importance across a broad range of lakes is not well resolved. We analyzed profiles of chlorophyll fluorescence, temperature, and light during summer stratification from 100 lakes in the Global Lake Ecological Observatory Network (GLEON) and quantified two characteristics of DCM structure: depth and thickness. While DCMs do form in oligotrophic lakes, we found that they can also form in eutrophic to dystrophic lakes. Using a random forestThe vertical distribution of chlorophyll in stratified lakes and reservoirs frequently exhibits a maximum peak deep in the water column, referred to as the deep chlorophyll maximum (DCM). DCMs are ecologically important hot spots of primary production and nutrient cycling, and their location can determine vertical habitat gradients for primary consumers. Consequently, the drivers of DCM structure regulate many characteristics of aquatic food webs and biogeochemistry. Previous studies have identified light and thermal stratification as important drivers of summer DCM depth, but their relative importance across a broad range of lakes is not well resolved. We analyzed profiles of chlorophyll fluorescence, temperature, and light during summer stratification from 100 lakes in the Global Lake Ecological Observatory Network (GLEON) and quantified two characteristics of DCM structure: depth and thickness. While DCMs do form in oligotrophic lakes, we found that they can also form in eutrophic to dystrophic lakes. Using a random forest algorithm, we assessed the relative importance of variables associated with light attenuation vs. thermal stratification for predicting DCM structure in lakes that spanned broad gradients of morphometry and transparency. Our analyses revealed that light attenuation was a more important predictor of DCM depth than thermal stratification and that DCMs deepen with increasing lake clarity. DCM thickness was best predicted by lake size with larger lakes having thicker DCMs. Additionally, our analysis demonstrates that the relative importance of light and thermal stratification on DCM structure is not uniform across a diversity of lake types.…
MetadatenAuthor details: | Taylor H. LeachORCiD, Beatrix E. BeisnerORCiD, Cayelan C. CareyORCiD, Patricia Pernica, Kevin C. RoseORCiD, Yannick HuotORCiD, Jennifer A. BrentrupORCiD, Isabelle DomaizonORCiD, Hans-Peter GrossartORCiDGND, Bastiaan W. IbelingsORCiD, Stephan Jacquet, Patrick T. KellyORCiD, James A. RusakORCiD, Jason D. Stockwell, Dietmar StraileORCiD, Piet VerburgORCiD |
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DOI: | https://doi.org/10.1002/lno.10656 |
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ISSN: | 0024-3590 |
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ISSN: | 1939-5590 |
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Title of parent work (English): | Limnology and oceanography |
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Subtitle (English): | the relative importance of light and thermal stratification |
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Publisher: | Wiley |
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Place of publishing: | Hoboken |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2018/08/24 |
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Publication year: | 2018 |
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Release date: | 2022/01/10 |
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Volume: | 63 |
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Issue: | 2 |
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Number of pages: | 19 |
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First page: | 628 |
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Last Page: | 646 |
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Funding institution: | IGB; Leibniz Association; NSFNational Science Foundation (NSF) [EF 1638704]; Ontario Ministry of the Environment and Climate Change; Inter-American Institute for Global Change Research [CRN3038] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 55 Geowissenschaften, Geologie / 550 Geowissenschaften |
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Peer review: | Referiert |
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Publishing method: | Open Access / Hybrid Open-Access |
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License (German): | CC-BY - Namensnennung 4.0 International |
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