Quantitative analysis of freshwater ostracode assemblages in southwestern Yukon Territory, Canada

Bunbury, Joan; Gajewski, Konrad

doi:10.1007/s10750-005-2746-0

Cited by 32 publications

(20 citation statements)

References 47 publications

(45 reference statements)

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“…Higher latitude lakes in North America display similar number of species per lake, as well. For instance, lakes in the Yukon territory, Canada display from three to eight ostracode species (Bunbury, & Gajewski, 2005). In contrast, other regions of the world are habitat a much higher number of ostracode species.…”

Section: Discussionmentioning

confidence: 99%

Ostrácodos no-marinos de lagos en el altiplano este-centro de México

Pérez

Lozano‐García

Caballero

2015

RBT

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Abstract:The ostracode fauna of the neartic-neotropical transitional zone has remained poorly known until this study. Ten ostracode species inhabit ten highland lakes (five maar lakes (phreatic/phreato-magmatic explosion origin), one volcanic-tectonic lake, three natural dams and one man-made dam) in East-central Mexico. Surface sediments from the deepest part and the littoral zone from all studied lakes were collected. Environmental variables (pH, temperature, dissolved oxygen, conductivity, TDS) were measured in situ and parallel water samples for chemical analysis were collected for habitat description. Widely distributed species in the study area (≥5 lakes) include Cypridopsis vidua, Darwinula stevensoni and Eucandona cf. patzcuaro. Limnocytherina axalapasco is an endemic species and was collected in three maar lakes and in one man-made dam. Rare species included: Chlamydotheca arcuata?, Fabaeformiscandona acuminata?, Ilyocypris gibba?, Limnocythere friabilis?, Potamocypris smaragdina? and Potamocypris unicaudata?. Highest species richness (6 spp.) was found in the large and shallow Lake Metztitlán (2.6km 2 , 5.5m deep), with the lake water type HCO 3 ->>SO 4 2->Cl ---Ca 2+ >Na + >Mg 2+ . The rest of studied lakes (<63m, <27km 2 ) had not more than three species. For instance, only two ostracode species were collected in Lake Alchichica, which is the largest, deepest and most saline studied maar lake. Rev. Biol. Trop. 63 (2): 401-425. Epub 2015 June 01.

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Section: Discussionmentioning

confidence: 99%

Ostrácodos no-marinos de lagos en el altiplano este-centro de México

Pérez

Lozano‐García

Caballero

2015

RBT

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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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“…Coupled element and stable isotope measurements in fossil ostracod calcite are being increasingly used in palaeoenvironmental reconstructions of temperature, salinity and productivity (e.g., De Deckker and Forester 1988;Griffiths and Holmes 2000). Whereas fossil and modern ostracod fauna and their ecology in midlatitudes are relatively well known due to numerous investigations, there are only a few records concerning freshwater ostracods in Siberia, or in (sub-) Arctic permafrost regions (e.g., Alm 1914;Bunbury and Gajewski 2005;Pietrzeniuk 1977;Semenova 2005).…”

Section: Introductionmentioning

confidence: 99%

Arctic freshwater ostracods from modern periglacial environments in the Lena River Delta (Siberian Arctic, Russia): geochemical applications for palaeoenvironmental reconstructions

et al. 2007

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The aim of this study is to describe ostracods from freshwater habitats in the Siberian Arctic in order to estimate the present-day relationships between the environmental setting and the geochemical properties of ostracod calcite. A special focus is on the element ratios (Mg/Ca, Sr/Ca), and the stable isotope composition (d and temperature effects. Temperature-dependence is reflected in the variations of this shift. For ostracod calcite of F. pedata a vital effect as compared to inorganic calcite in equilibrium was quantified with 1.4%. Results of this study are valuable for the palaeoenvironmental interpretation of geochemical data of fossil ostracods from permafrost deposits.

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Quantitative analysis of freshwater ostracode assemblages in southwestern Yukon Territory, Canada

Cited by 32 publications

References 47 publications

Ostrácodos no-marinos de lagos en el altiplano este-centro de México

Ostrácodos no-marinos de lagos en el altiplano este-centro de México

Paleoenvironmental Studies in Southwestern Yukon

Arctic freshwater ostracods from modern periglacial environments in the Lena River Delta (Siberian Arctic, Russia): geochemical applications for palaeoenvironmental reconstructions

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