Patterns of Arctic Tundra Greenness Based on Spatially Downscaled Solar-Induced Fluorescence

Fu, Dongjie; Su, Fenzhen; Wang, Juan; Sui, Yijie

doi:10.3390/rs11121460

Cited by 1 publication

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References 58 publications

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“…Until recently, it is still unclear whether diatoms can generally adapt to recent global climate change (Irwin, Finkel, Müller‐Karger, & Troccoli Ghinaglia, ) and if vegetation changes, which already resulted in the greening and browning of the tundra (Fu, Su, Wang, & Sui, ; Lara, Nitze, Grosse, Martin, & McGuire, ), will eventually cause the disappearance of specific diatoms along with the potential loss of the tundra biome in the future. Furthermore, temperature‐related variables, like ice cover duration, thermal stratification (Rühland, Priesnitz, & Smol, ), primary production (Drake et al, ) and nutrient availability in Arctic lakes (Pestryakova et al, ) are affected by recent global warming.…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic diversity and environment form assembly rules for Arctic diatom genera—A study on recent and ancient sedimentary DNA

Stoof‐Leichsenring

Pestryakova

Epp

et al. 2020

Journal of Biogeography

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Aim: This study investigates taxonomic and phylogenetic diversity in diatom genera to evaluate assembly rules for eukaryotic microbes across the Siberian tree line. We first analysed how phylogenetic distance relates to taxonomic richness and turnover.Second, we used relatedness indices to evaluate if environmental filtering or competition influences the assemblies in space and through time. Third, we used distancebased ordination to test which environmental variables shape diatom turnover.Location: Yakutia and Taymyria, Russia: we sampled 78 surface sediments and a sediment core, extending to 7,000 years before present, to capture the forest-tundra transition in space and time respectively.Taxon: Arctic freshwater diatoms. Methods:We applied metabarcoding to retrieve diatom diversity from surface and core sedimentary DNA. The taxonomic assignment binned sequence types (lineages) into genera and created taxonomic (abundance of lineages within different genera) and phylogenetic datasets (phylogenetic distances of lineages within different genera).Results: Contrary to our expectations, we find a unimodal relationship between phylogenetic distance and richness in diatom genera. We discern a positive relationship between phylogenetic distance and taxonomic turnover in spatially and temporally distributed diatom genera. Furthermore, we reveal positive relatedness indices in diatom genera across the spatial environmental gradient and predominantly in time slices at a single location, with very few exceptions assuming effects of competition. Distancebased ordination of taxonomic and phylogenetic turnover indicates that lake environment variables, like HCO 3 − and water depth, largely explain diatom turnover. Main conclusion:Phylogenetic and abiotic assembly rules are important in understanding the regional assembly of diatom genera across lakes in the Siberian tree line ecotone. Using a space-time approach we are able to exclude the influence of geography and elucidate that lake environmental variables primarily shape the assemblies. We conclude that some diatom genera have greater capabilities to adapt toThis is an open access article under the terms of the Creat ive Commo ns Attri bution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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