Responses of Fragilarioid-dominated diatom assemblages in a small Arctic lake to Holocene climatic changes, Russell Island, Nunavut, Canada

Finkelstein, Sarah A.; Gajewski, Konrad

doi:10.1007/s10933-008-9215-5

Cited by 53 publications

(34 citation statements)

References 51 publications

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“…5b; Tarasov et al, 2009;Bezrukova et al, 2010). In the Lake Kotokel sediments diatoms S. pinnata and P. brevistriata preferring relatively cold water (Finkelstein and Gajewski, 2008) are replaced by comparatively warm-water species A. granulata and A. ambigua ( Fig. 2b; Popovskaya et al, 2002;Bezrukova et al, 2010).…”

Section: The Lgm and Late Glacial Diatom Isotope Record And Lacustrinmentioning

confidence: 98%

“…2b; Bezrukova et al, 2010) mainly involve species that usually prevail during the summer period in a wide range of water temperatures, i.e. between~7e8 C and 18e20 C (Kuz 'mich, 1988;Smol, 1988;Popovskaya et al, 2002;Barinova et al, 2006;Finkelstein and Gajewski, 2008;Rühland et al, 2008;Kuzmin et al, 2009;Wang et al, 2012b). Assuming that water temperature is the primary control for d 18 O diatom values from the LGM/late glacial Lake Kotokel record, then the high-frequency variability on the order of 4.5‰ would result in a theoretical variation of 22.5 C in summer water temperatures.…”

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confidence: 99%

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The last glacial maximum and late glacial environmental and climate dynamics in the Baikal region inferred from an oxygen isotope record of lacustrine diatom silica

Kostrova

Meyer

Chapligin

et al. 2014

Quaternary International

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a b s t r a c tThe last glacial maximum and late glacial environmental and climatic variability in the Baikal region, southern Siberia, Russia has been studied in a sediment sequence from Lake Kotokel, located 2 km east of Lake Baikal, using the oxygen isotope composition of diatom silica (d 18 O diatom ). The purification of diatom frustules involved the process of trimethylsilylation, which has been shown to be suitable for preparation of diatoms for oxygen isotope analysis. The Lake Kotokel d 18O diatom record presented here spans intervals from about 24.6 to 22.9 ka BP (further referred to as 'last glacial maximum') and~16.7e11.5 ka BP (further referred to as 'late glacial') displaying variations in the oxygen isotope composition between þ26.7 and þ31.2‰. Overall high d18 O diatom values of about þ29 to þ31‰ during the two investigated intervals characterize a strongly evaporative lake system in a dry environment and suggest a lower than present lake level due to enhanced evaporation. The Lake Kotokel diatom isotope record is roughly in line with the 60 N summer solar insolation, pointing to a linkage to broader-scale climate change, but displays weaker reaction to short-term climatic oscillations, i.e. Bølling-Allerød or Younger Dryas. The climate warming at~14.3 ka BP is marked by negative spikes in the d18 O diatom record due to isotopically low melt water input from the mountainous hinterland.

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Section: The Lgm and Late Glacial Diatom Isotope Record And Lacustrinmentioning

confidence: 98%

mentioning

confidence: 99%

The last glacial maximum and late glacial environmental and climate dynamics in the Baikal region inferred from an oxygen isotope record of lacustrine diatom silica

Kostrova

Meyer

Chapligin

et al. 2014

Quaternary International

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“…The maximum abundance of Salix in the pollen record from the RS29 core as well higher pollen concentrations and influx (Gajewski 1995(Gajewski , 2015b suggest warmer conditions, and possibly a longer growing season prior tõ 6000 cal yr BP. A diatom record from Russell Island adjacent to nearby Prince of Wales Island (Finkelstein and Gajewski 2008) was also interpreted as signaling warmer temperatures prior to 6500 cal yr BP.…”

Section: Early To Mid-holocene Paleoenvironmentsmentioning

confidence: 99%

Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada

2017

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This study presents a diatom-based analysis of the post-glacial Holocene environmental history at Lake RS29 on Somerset Island in the Canadian High Arctic. Earliest post-glacial diatom assemblages (10 200-10 000 cal yr BP) consisted mainly of small, benthic fragilarioid taxa. Poor diatom preservation in the early Holocene (~10 000-6200 cal yr BP) is associated with warm conditions, as determined by pollen data from the same core and other paleoclimate estimates from the region. Analysis of this and other sites from across the Canadian Arctic suggest that zones of poor diatom preservation or diatom absence in lake sediment records may be associated with warm conditions. After 6200 cal yr BP, acidophilic assemblages consisting of Aulacoseira spp. and a suite of periphytic taxa indicate acidification since the mid-Holocene. During this time period, cooling causing changes in lake ice phenology was likely a major driver of the reconstructed mid-Holocene pH decline. Watershed processes, including reduced fluxes of base cations as the rate of sediment accumulation slowed, may also be contributors to long-term shifts in lake water pH and associated changes in diatom assemblages. The uppermost sediments in the Lake RS29 record were characterized by abrupt declines in Aulacoseira alpigena and increases in benthic diatom taxa Cyclotella sensu lato, suggesting an increase in lake water pH and longer ice-free seasons.Key words: paleoclimate, Holocene, Canadian Arctic Archipelago, lake sediments, diatoms, paleolimnology, pollen, diatom dissolution.Résumé : Cette étude présente une analyse basée sur les diatomées afin d'examiner l'histoire environnementale de l'Holocène postglaciaire au lac RS29 sur l'île Somerset dans le Haut-Arctique canadien. Les tout premiers assemblages de diatomées postglaciaires (10 200 -10 000 ans BP) étaient constitués principalement de petits taxons benthiques fragilarioid. La pauvre conservation des diatomées au cours de l'Holocène précoce (~10 000-6 200 ans BP) est associée aux conditions chaudes, comme déterminées par les données de pollen provenant de la même carotte et d'autres évaluations paléoclimatiques de la région. L'analyse de ce site et d'autres sites à travers l'Arctique canadien suggère que les zones de pauvre conservation de diatomées ou d'absence de diatomées dans les données de sédiments lacustres enregistrées pourraient être associées aux conditions chaudes. Après 6 200 ans BP, les assemblages d'acidiphiles constitués d'Aulacoseira spp. et d'une gamme de taxons periphytiques indiquent l'acidification depuis l'Holocène moyen. Pendant cette période, le refroidissement causant des changements phénologiques de la glace lacustre était probablement un facteur du milieu important causant la baisse du pH reconstruit de l'Holocène moyen. Les processus des bassins hydrographiques, y compris les flux réduits de cations basiques alors que le taux d'accumulation de sédiments a ralenti, peuvent aussi être des facteurs

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“…Small araphid fragilarioid taxa are often typical of circumneutral waters in harsh environments and they can comprise >50% of the diatom assemblages in Arctic island lakes (Bouchard et al, 2004). They have been linked with water temperature as well as with water chemistry (Bouchard et al, 2004;Schmidt et al, 2004) and their tychoplanktonic habit (Finkelstein & Gajewski, 2008) may offer considerable advantage over attached forms when light is limiting. A Pinnularia-Eunotia community is typical of small peaty pools generally and especially in such sites in Scotland (Carter & Bailey-Watts, 1981).…”

Section: Diatom Ecologymentioning

confidence: 99%

On the factors affecting distributions of freshwater diatom species in a remote South Atlantic archipelago

Flower

Kernan

Noon³

et al. 2012

European Journal of Phycology

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Diatom species distributions on remote islands are influenced by both habitat quality and location. In this study diatom distributions and water quality were explored in the Falkland Islands archipelago with reference to island floras elsewhere, using 28 freshwater sites (small ponds, shallow lowland lakes, upland tarns and several streams). Site water chemistries varied from strongly acid to circum-neutral and from low to high conductivity and water-colour. Dissolved ions co-varied with conductivity and varied strongly between sites and ion ratios indicated a strong influence of sea-salt deposition. Canonical Correspondence Analysis of the diatom and environmental data revealed three groups of sites, (1) high water-colour and low pH, (2) low conductivity and low water-colour, and (3) high conductivity and higher pH. Diatom species frequency abundances were most strongly influenced by water conductivity and pH. Diatom assemblages were composed of both cosmopolitan and regionally endemic Subantarctic species. Water chemistry was a weak predictor of diatom diversity but sites with more regionally endemic species tended also to have more cosmopolitan species. Taxonomic harmonization allowed species comparisons to be made with diatom assemblages on two islands elsewhere, Signy Island (Antarctica) and South Uist (Scottish Outer Hebrides). Detrended Correspondence Analysis of the species data from these three locations strongly discriminated the Signy Island sites and Subantarctic species characterized the Falkland Islands samples. Regionally endemic species groups within the Subantarctic zone were configured by biogeographical controls on dispersal, as well as by habitat selection and water quality. Variance partitioning showed that water chemistry and spatial (location) variables were both highly significant in accounting for similar proportions of unique variance in the combined island-species dataset. Despite overall low diversity, Subantarctic species are an important floral component and need to be incorporated into global freshwater diatom diversity patterns by using species-sensitive and carefully harmonized datasets.

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Responses of Fragilarioid-dominated diatom assemblages in a small Arctic lake to Holocene climatic changes, Russell Island, Nunavut, Canada

Cited by 53 publications

References 51 publications

The last glacial maximum and late glacial environmental and climate dynamics in the Baikal region inferred from an oxygen isotope record of lacustrine diatom silica

The last glacial maximum and late glacial environmental and climate dynamics in the Baikal region inferred from an oxygen isotope record of lacustrine diatom silica

Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada

On the factors affecting distributions of freshwater diatom species in a remote South Atlantic archipelago

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