Temperature-growth divergence in white spruce forests of Old Crow Flats, Yukon Territory, and adjacent regions of northwestern North America

Porter, Trevor J.; Pisaric, Michael F. J.

doi:10.1111/j.1365-2486.2011.02507.x

Cited by 84 publications

(106 citation statements)

References 65 publications

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“…The abundance of pigments from total algae (β-carotene), green algae (lutein), diatoms (diadinoxanthin), and cyanobacteria (canthaxanthian) continued to increase, while water levels remained low (MacDonald et al 2012), shifting limnological conditions from low to high aquatic production. Conversely, Zelma Lake was moderately productive prior to drainage owing to stable shoreline conditions and increasing temperatures (Porter and Pisaric 2011), supporting elevated concentrations of lutein (green algae) and β-carotene (total algae). Following drainage, aquatic production dramatically increased at Zelma Lake, more so than at Hot Spring Lake.…”

Section: Discussionmentioning

confidence: 99%

“…At Hot Spring Lake, thermokarst expansion culminated in a lake drainage event followed by a rapid and then more gradual increase in primary production as water levels increased and the lake returned to a stable phase. Thermokarst expansion in Zelma Lake was followed by a gradual increase in primary production owing to stabilized shorelines (reduced turbidity) and the cumulative impact of warmer summer temperatures beginning in the 1970s (Porter and Pisaric 2011). Warmer temperatures contribute to increased production (e.g., changes in ice cover and thermal structure, longer growing season) and water level declines (e.g., evaporative drawdown) in much of OCF and potentially other circumpolar thermokarst landscapes (Ruhland et al 2003;Smol et al 2005;Smol and Douglas 2007).…”

Section: Discussionmentioning

confidence: 99%

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Limnological evolution of Zelma Lake, a recently drained thermokarst lake in Old Crow Flats (Yukon, Canada)

et al. 2017

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Evidence from remote sensing studies suggests that the frequency of thermokarst lake drainage events is increasing in response to climate change, but the consequences of these changes on the limnology of remaining waterbodies remain unknown. Here, we utilize a multiparameter paleolimnological record and post-drainage water isotope and chemistry monitoring to characterize the limnological evolution of Zelma Lake in Old Crow Flats, Yukon. During the early part of the record (~1678 to 1900 CE), analysis of geochemical variables and algal pigments indicate relatively stable limnological conditions. Abruptly beginning at~1900, Zelma Lake experienced a 40 year phase of reduced production, likely resulting from thermokarst shoreline expansion and associated increases in turbidity and low light availability. This was followed by~70 years of increasing production, likely from the stabilization of shorelines combined with a warming climate. Zelma Lake catastrophically drained in June 2007. Post-drainage conditions were characterized by intense eutrophication marked by increases in nutrient and major ion concentrations and the unprecedented occurrence of okenone and diatoxanthin pigments. Comparison to the post-drainage paleolimnological record from another thermokarst lake in Old Crow Flats indicates that a sharp increase of production is likely a common outcome of thermokarst lake drainage, yet intensity differs owing to site-specific catchment characteristics.Key words: climate change, thermokarst lakes, paleolimnology, limnology, lake drainage.Résumé : La preuve obtenue des études de télédétection suggère que la fréquence des évé-nements de drainage de lacs thermokastiques augmente en réponse au changement climatique, mais les conséquences de ce changement sur la limnologie des plans d'eau restant ne sont pas connues. Ici, nous utilisons un rapport paléolimnologique à multiples paramètres et la surveillance isotopique et chimique de l'eau postdrainage afin de caractériser l'évolu-tion limnologique du lac Zelma, à Old Crow Flats au Yukon. Pendant la première période faisant l'objet du rapport (~1678 à 1900 notre ère), l'analyse des variables géochimiques et des pigments algaires indiquent des conditions limnologiques relativement stables. Brusquement débutant~1900, le lac Zelma a subi une phase de 40 ans de production réduite, probablement en raison de l'expansion du rivage thermokarstique et des augmentations de la turbidité et de la faible luminosité disponible qui y sont associées. Il s'en suivit~70 ans de production accrue, probablement en raison de la stabilisation du rivage combinée avec le réchauffement du climat. Le lac Zelma s'est vidé de façon catastrophique en juin 2007.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Limnological evolution of Zelma Lake, a recently drained thermokarst lake in Old Crow Flats (Yukon, Canada)

et al. 2017

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“…Average annual air temperature is −9.0°C and annual precipitation is 265.5 mm with 54.3% falling as rainfall climate normal, station ID 2100800) (Environment Canada 2007). According to dendroclimatological analysis, OCF has been experiencing marked warming in recent decades (Porter and Pisaric 2011).…”

Section: Site Descriptionmentioning

confidence: 99%

Biotic responses to multiple aquatic and terrestrial gradients in shallow subarctic lakes (Old Crow Flats, Yukon, Canada)

et al. 2017

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Biotic communities in shallow northern lakes are frequently used to assess environmental change; however, complex interactions among multiple factors remain understudied. Here, we present analyses of a comprehensive data set that evaluates the influence input waters, catchment characteristics, limnology, and sediment properties on diatom and chironomid assemblages in surface sediments of~49 shallow mainly thermokarst lakes in Old Crow Flats, Yukon. Multivariate analyses and ANOSIM tests identified that composition of diatom (119 taxa) and chironomid (68 taxa) assemblages differs significantly (p < 0.05) between lakes with snowmelt-versus rainfall-dominated input water. Redundancy analyses revealed strong correlation of limnological, sediment, and catchment variables with input waters. Variation partitioning analyses showed that unique effects of limnological variables account for the largest proportion of variation in diatom and chironomid assemblages (17.2% and 12.6%, respectively). Important independent roles of sediment properties (8.5% and 9.5%) and catchment characteristics (4.9% and 5.1%) were also identified. We suggest that the substantial variation shared among these classes (6.1% and 7.9%) is largely attributable to hydrological processes. Our study demonstrates the utility of multi-factor analysis in northern aquatic research and draws attention to the limitations of one-dimensional comparisons and their interpretations when modelling biotic responses to environmental change.Key words: thermokarst lakes, limnology, variation partitioning analysis, diatoms, chironomids.Résumé : Les communautés biotiques des lacs peu profonds du nord sont fréquemment utilisées pour évaluer le changement environnemental; cependant, les interactions complexes parmi des facteurs multiples demeurent peu étudiées. Ici, nous présentons les analyses d'un ensemble de données complet qui évaluent l'effet des apports d'eau, des caractéristiques de bassins versants, de la limnologie et des propriétés de sédiments sur les assemblages de diatomées et de chironomidés dans les sédiments de surface d'environ 49 lacs principalement thermokartiques peu profonds de la plaine Old Crow au Yukon. Des analyses multivariées et des tests d'ANOSIM ont déterminé que la composition d'assemblages de diatomées (119 taxons) et de chironomidés (68 taxons) diffère significativement (p , 0,05) entre les lacs dont l'apport d'eau provient principalement de la fonte de neige par rapport aux lacs alimentés surtout par les averses. Les analyses de redondance ont révélé

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“…The different temperature responses of trees in the two regions may be related to their different moisture conditions (Porter and Pisaric 2011;Lévesque et al 2013). Water limitations and warming-induced drought are primary drivers of a regional tree growth decline or even increased tree mortality in recent decades (e.g., Allen et al 2010;Anderegg et al 2013;Liu et al 2013;Williams et al 2013).…”

Section: Divergent Response To the Warming Of Different Regionsmentioning

confidence: 99%

Differential response of Qilian juniper radial growth to climate variations in the middle of Qilian Mountains and the northeastern Qaidam Basin

et al. 2015

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Tree growth in the mid-latitudes of the northern hemisphere reveals significant interannual variation in carbon sequestration, and the variations have been widely attributed to climate change, especially to the recent rapid warming and increasing drought stress. However, the response of natural trees under the different regions that exist in the northeastern QinghaiTibetan Plateau remains unclear. Here, we use nine Qilian juniper (Sabina przewalskii) treering width and basal area increment (BAI) chronologies from the middle of the Qilian Mountains and the northeastern Qaidam Basin to quantify tree growth trends and their response to the recent rapid warming. The trees, growing at high and low elevations, exhibited a consistent pattern of inter-annual variations, with increasing synchronicity in their trends since 1950. Responses to several climate factors indicate that increasing temperature accelerated tree growth in the middle of the Qilian Mountains, but restricted tree growth in the northeastern Qaidam Basin. Moving-window correlation analyses demonstrate a clearly contrasting response to the temperature variations. Our findings suggest that growth of Qilian juniper in the middle of the Qilian Mountains will increase steadily in the future rapid warming, but may remain constant or even decrease in the northeastern Qaidam Basin. These contrasting responses to temperatures provide valuable information on forest dynamics Climatic Change (2015)

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Temperature-growth divergence in white spruce forests of Old Crow Flats, Yukon Territory, and adjacent regions of northwestern North America

Abstract: We present a new 23-site network of white spruce ring-width chronologies near boreal treeline in Old

Cited by 84 publications

References 65 publications

Limnological evolution of Zelma Lake, a recently drained thermokarst lake in Old Crow Flats (Yukon, Canada)

Limnological evolution of Zelma Lake, a recently drained thermokarst lake in Old Crow Flats (Yukon, Canada)

Biotic responses to multiple aquatic and terrestrial gradients in shallow subarctic lakes (Old Crow Flats, Yukon, Canada)

Differential response of Qilian juniper radial growth to climate variations in the middle of Qilian Mountains and the northeastern Qaidam Basin

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