Spatial and temporal variability of lake ontogeny in south-western Greenland

Law, Antonia; Anderson, N. J.; McGowan, Suzanne

doi:10.1016/j.quascirev.2015.08.005

Cited by 30 publications

(42 citation statements)

References 67 publications

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“…Increases in diatom production, as inferred by increases in BSi, in diatom valve concentrations, or in fluxes of photosynthetic pigments, in Arctic lake sediment records are often interpreted as indicative of warmer temperatures (e.g., Cremer et al 2001;LeBlanc et al 2004;Michelutti et al 2005;Rühland et al 2015 and references therein). Other studies indicate that in some lakes, diatom production and community composition are more closely related to nutrient availability and light penetration (Baier et al 2004;Malik and Saros 2016) or lake catchment hydrochemistry and only indirectly controlled by climate (Anderson 2000;Anderson et al 2008Anderson et al , 2012Law et al 2015). Our results suggest that this relationship may be further modified by dissolution in warm periods, and out-of-phase relations would appear between independent temperature proxies and the diatom production proxies (e.g., Michelutti et al 2007;Wagner et al 2008).…”

Section: Diatom-free Zones In Arctic Lake Sedimentsmentioning

confidence: 50%

“…Smith (2002) found very low concentrations of diatoms at all of his sites in the older sediments. In several sites in southern Greenland and the eastern Arctic, zones with low concentrations of diatoms were found in the older sections as well, with diatom concentrations subsequently increasing at various times (Adams and Finkelstein 2010;Perren et al 2012a;Florian et al 2015;Law et al 2015).…”

Section: Diatom-free Zones In Arctic Lake Sedimentsmentioning

confidence: 97%

“…Diatoms were absent during the time that coincides broadly with the warmest part the Holocene. However, Law et al (2015) attributed increased dissolution of diatoms at two sites in Greenland to increased alkalinity in the early stages of the lake ontogeny. They suggested that time since deglaciation determined the alkalinity levels of the lake more than climate.…”

Section: Diatom-free Zones In Arctic Lake Sedimentsmentioning

confidence: 99%

“…On millennial time scales, diatom-inferred pH and climate have been shown to be tightly coupled in poorly buffered High Arctic lakes (Wolfe 1996(Wolfe , 2002Michelutti et al 2007). Other long-term controls on the pH of Arctic lakes may relate to watershed processes and landscape development (Law et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Diatom-free Zones In Arctic Lake Sedimentsmentioning

confidence: 50%

Section: Diatom-free Zones In Arctic Lake Sedimentsmentioning

confidence: 97%

Section: Diatom-free Zones In Arctic Lake Sedimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2017

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“…Saline lakes in the region are more sensitive to climate forcing (precipitation: evaporation), with lake levels lowering by >10 m occurring when the climate became warmer and drier . Comparisons of similar lakes in SW Greenland suggest that lake water pH declines as lakes age, but that the rate of the decline depends on the climatic conditions and the particular ecological assemblages in the different lakes . Such observations demonstrate three main principles: (1) lakes develop as they age, and this is associated with changes in catchment weathering, soil development and water chemistry; (2) lakes respond to climate forcing in a variety of ways and (3) the rate and nature of the response varies depending on the specific characteristics of the lake.…”

Section: Climate Versus People: Disentangling the Driversmentioning

confidence: 99%

Deciphering long‐term records of natural variability and human impact as recorded in lake sediments: a palaeolimnological puzzle

et al. 2016

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Global aquatic ecosystems are under increasing threat from anthropogenic activity, as well as being exposed to past (and projected) climate change, however, the nature of how climate and human impacts are recorded in lake sediments is often ambiguous. Natural and anthropogenic drivers can force a similar response in lake systems, yet the ability to attribute what change recorded in lake sediments is natural, from that which is anthropogenic, is increasingly important for understanding how lake systems have, and will continue to function when subjected to multiple stressors; an issue that is particularly acute when considering management options for aquatic ecosystems. The duration and timing of human impacts on lake systems varies geographically, with some regions of the world (such as Africa and South America) having a longer legacy of human impact than others (e.g., New Zealand). A wide array of techniques (biological, chemical, physical and statistical) is available to palaeolimnologists to allow the deciphering of complex sedimentary records. Lake sediments are an important archive of how drivers have changed through time, and how these impacts manifest in lake systems. With a paucity of ‘real‐time’ data pre‐dating human impact, palaeolimnological archives offer the only insight into both natural variability (i.e., that driven by climate and intrinsic lake processes) and the impact of people. While there is a need to acknowledge complexity, and temporal and spatial variability when deciphering change from sediment archives, a palaeolimnological approach is a powerful tool for better understanding and managing global aquatic resources. WIREs Water 2017, 4:e1195. doi: 10.1002/wat2.1195 This article is categorized under: Water and Life > Stresses and Pressures on Ecosystems Science of Water > Water and Environmental Change Water and Life > Methods

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Centennial clonal stability of asexual Daphnia in Greenland lakes despite climate variability

Dane

Anderson

Osburn

et al. 2020

Ecology and Evolution

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Spatial and temporal variability of lake ontogeny in south-western Greenland

Cited by 30 publications

References 67 publications

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

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

Deciphering long‐term records of natural variability and human impact as recorded in lake sediments: a palaeolimnological puzzle

Centennial clonal stability of asexual Daphnia in Greenland lakes despite climate variability

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