Modern Chironomid Assemblages and Their Relationship to Physical and Chemical Variables in Southwest Yukon and Northern British Columbia Lakes

Wilson, S.; Gajewski, Konrad

doi:10.1657/1523-0430(2004)036[0446:mcaatr]2.0.co;2

Cited by 26 publications

(26 citation statements)

References 44 publications

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“…Previous studies have documented chironomid distributions in lake sediments from northern North America, including treeline in central Canada (Walker & MacDonald, 1995), eastern Canada, including several sites from Devon Island and southern Baffin Island (Walker et al, 1997), Yukon and the Mackenzie Delta region (Walker et al, 2003) and the southwest Yukon (Wilson & Gajewski, 2004). Data presented here extend the distribution northward to encompass the Highand Middle-Arctic of Canada.…”

Section: Discussionsupporting

confidence: 55%

“…Corynocera ambigua was reported in many lakes from the Northwest Territories (Walker & MacDonald, 1995) and Yukon (Walker et al, 2003;Wilson & Gajewski, 2004). Walker et al (2003) considered this species a Beringian taxon, as it is not found in Quebec/Labrador, nor to the south of 60 o N in North America.…”

Section: Discussionmentioning

confidence: 99%

“…Several studies have documented chironomid distributions in lake sediments from the boreal and treeline regions of Europe and North America (Walker, 1990;Walker & MacDonald, 1995;Olander et al, 1997Olander et al, , 1999Lotter et al, 1999;Brooks & Birks, 2000, 2001Porinchu & Cwynar, 2000;Larocque et al, 2001;Walker et al, 2003;Wilson & Gajewski, 2004), but only six samples have been analyzed from the Arctic Islands of northern Canada, specifically from Baffin and Devon Islands (Walker, 1990;Walker et al, 1997). If surface sample networks are to be used in paleoenvironmental reconstructions, samples from arctic regions are needed, as environments there are likely analogues for conditions that may have existed farther south during glacial and late-glacial periods (Walker, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Distribution of Chironomidae (Insecta: Diptera) Head Capsules in Recent Sediments of Canadian Arctic Lakes

Gajewski

Bouchard

Wilson³

et al. 2005

Hydrobiologia

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Thirty-two taxa of chironomid larvae were collected from the sediments of 50 lakes from across the Canadian Arctic Islands. Most chironomid taxa living in the Arctic have wide distributions, with only one taxon, Abiskomyia, showing a clear geographic limitation in this region. Many of these taxa have habitat preferences, among which lake morphometry, pH, nutrients and temperature are important. Due to the complex environmental patterns in the Arctic, lakes in both the northern and southern portion of the Canadian Arctic Archipelago have warmer temperatures and the chironomid assemblages of these two regions resemble each other more than those of the intervening central islands. Chironomid diversity is lowest in the central arctic islands, primarily Devon and Cornwallis Island, where the combination of low nutrients and cold temperatures provide the most severe environment for chironomid survival.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Distribution of Chironomidae (Insecta: Diptera) Head Capsules in Recent Sediments of Canadian Arctic Lakes

Gajewski

Bouchard

Wilson³

et al. 2005

Hydrobiologia

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“…Modern organism assemblages from southwestern Yukon, including pollen (Birks, 1977;Lacourse, 1998;Whitmore et al, 2005), diatom (Wilson and Gajewski, 2002), chironomid (Wilson and Gajewski, 2004), and ostracode (Bunbury and Gajewski, 2005) assemblages, have also been analyzed in relation to the environment. Several characteristics of the lake environment (e.g., water depth, organic matter content of the sediments, and water chemistry) affect the composition of the species assemblages found in these lakes.…”

Section: Modern Studies For Interpreting Paleoenvironmental Datamentioning

confidence: 99%

Paleoenvironmental Studies in Southwestern Yukon

Gajewski¹,

Bunbury²,

Vetter³

et al. 2014

ARCTIC

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ABSTRACT. The St. Elias Mountain region has occupied an important place in the study of the Quaternary because it presents a relatively accessible non-polar icefield and an array of environments from tundra to boreal forest. Paleoenvironmental studies in southwestern Yukon have documented the broad-scale climatic changes of the past 20 000 years, although few studies exist with well-dated sequences at high temporal resolution. Picea glauca arrived across the entire region around 10 000 years ago; however, the details regarding its migration pathways are not well known. Available records indicate few major changes in the composition of the boreal forest vegetation since that time. A slightly more intense fire regime in the early to mid Holocene has been suggested, but this conclusion is based on only a few studies. Variations in the tree line during the Holocene have been examined, but these studies also lack details. There is no evidence for more extensive grasslands in the area during the Holocene. Paleolimnological studies indicate that changes in populations of aquatic organisms have occurred in response to either Holocene climates or watershed variability.Key words: Quaternary, Holocene, boreal forest, Yukon, Kluane Lake, paleoecology, pollen analysis, paleolimnology, climatic change, dendroclimatology, fire history RÉSUMÉ. La région du mont St. Elias occupe une place importante dans l'étude du Quaternaire parce qu'elle recèle un champ de glace non polaire relativement accessible ainsi qu'une panoplie d'environnements, allant de la toundra à la forêt boréale. Des études paléoécologiques effectuées dans le sud-ouest du Yukon ont permis de documenter les changements climatiques à grande échelle des 20 000 dernières années, et ce, même s'il existe peu d'études dotées de séquences bien datées de grande résolution temporelle. Picea glauca est arrivée dans toute la région il y a environ 10 000 ans. Cependant, les détails concernant sa voie de migration ne sont pas bien connus. Les données disponibles indiquent peu de changements majeurs dans la composition de la forêt boréale depuis cette période. Un régime des feux un peu plus intense de l'Holocène inférieur à l'Holocène moyen a été suggéré, mais cette conclusion ne repose que sur un petit nombre d'études. Les variations caractérisant la limite des arbres pendant l'Holocène ont été examinées, mais ces études ne sont également pas suffisamment détaillées. Il n'existe pas de preuve qu'il existait des prairies à plus grande échelle dans la région pendant l'Holocène. Des études paléolimnologiques indiquent que des changements caractérisant les populations d'organismes se sont produits en raison de la variabilité des climats ou dans des bassins hydrographiques de l'Holocène.

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“…This study was motivated by discussions with researchers attempting to explain the spatial patterning of plant communities in and around the Kluane region of northwestern Canada, as well as our own work developing calibration equations for quantitative paleoclimate reconstructions (e.g., Wilson andGajewski, 2002, 2004;Bunbury and Gajewski, 2005). Although southwestern Yukon is an ideal location for studying mountainous environments, very few climate data are available.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Daily Air Temperatures across a Topographically Complex Alpine Region of Southwestern Yukon, Canada

Chaput¹,

Gajewski²

2014

ARCTIC

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ABSTRACT. This study provides an analysis of six years of daily air temperature data collected using 16 HOBO ® UA-002-64 Pendant data loggers placed along a 280 km transect in southwestern Yukon and northern British Columbia. Correlation and time series analyses, including Seasonal Decomposition of Time Series by Loess (STL) methods, revealed very high correlations among all data series at daily to annual timescales. The two meteorological stations in the region are found to be generally representative of the greater area, and local temperature variability appears to be predominantly determined by synoptic-scale weather patterns. The annual temperature cycle in this region is complex and has annually repeating components at all study sites across the region. The analysis of daily data using the STL method can provide new insight into climate time series and enhance our ability to observe patterns and extremes in temperatures across varying spatial and temporal scales. Data loggers provide a cost-effective way of obtaining similar (and sometimes higher-quality) information compared to meteorological stations or gridded global datasets.Key words: Yukon climate, HOBO data logger, meteorological station network, daily and hourly temperature dataset, time series analysis, seasonal-trend decomposition (STL) RÉSUMÉ. Cette étude présente l'analyse de données sur la température de l'air prélevées au cours de six années à l'aide de 16 enregistreurs de données HOBO MD UA-002-64 Pendant le long d'un transect de 280 km situé dans le sud-ouest du Yukon et le nord de la Colombie-Britannique. L'analyse des corrélations et des séries temporelles, faisant notamment appel aux méthodes de décomposition saisonnière des séries temporelles de Loess (STL), ont révélé de très fortes corrélations entre toutes les séries de données aux échelles de temps allant de quotidiennes à annuelles. Les deux stations météorologiques de la région sont généralement représentatives de la grande région, et la variabilité des températures locales semble principalement déterminée par le régime climatique à l'échelle synoptique. Dans cette région, le cycle des températures annuelles est complexe. Il comprend des composantes récurrentes annuellement à tous les sites étudiés, à la grandeur de la région. L'analyse des données quotidiennes à l'aide de la méthode STL peut donner une nouvelle perspective des séries temporelles climatiques et rehausser notre capacité à observer les tendances et les extrêmes de températures pour des échelles spatiales et temporelles variées. Les enregistreurs de données constituent une manière économique d'obtenir des renseignements similaires (et parfois de meilleure qualité), comparativement aux données des stations météorologiques ou aux ensembles de données globales sous forme de valeurs aux points de grille.Mots clés : climat du Yukon, enregistreur de données HOBO, réseau de stations météorologiques, ensemble de données de températures quotidiennes et horaires, analyse des séries temporelles, décomposition des tendances saiso...

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Modern Chironomid Assemblages and Their Relationship to Physical and Chemical Variables in Southwest Yukon and Northern British Columbia Lakes

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 26 publications

References 44 publications

Distribution of Chironomidae (Insecta: Diptera) Head Capsules in Recent Sediments of Canadian Arctic Lakes

Distribution of Chironomidae (Insecta: Diptera) Head Capsules in Recent Sediments of Canadian Arctic Lakes

Paleoenvironmental Studies in Southwestern Yukon

Analysis of Daily Air Temperatures across a Topographically Complex Alpine Region of Southwestern Yukon, Canada

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