Do diatoms in the Swiss Alps reflect the length of ice-cover?

Lotter, André F.; Bigler, Christian

doi:10.1007/s000270050002

Cited by 293 publications

(259 citation statements)

References 22 publications

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“…Indeed altitude of a high altitude lake determines its surface freezing duration (e. g. Pourriot and Meybeck, 1995), which has an obvious impact on lake biology and therefore on diatom species composition. This factor of primary importance selects only a few species able to survive these extremes habitats as is has already been shown on planktonic diatom of Alpine lakes (Lotter and Bigler, 2000). UV radiations intensity is also related to altitude and also structure littoral communities (Vinebrooke and Leavitt, 1999) and this may impact diatom communities.…”

Section: Local Factors Impact More Diatom Communities Composition Thamentioning

confidence: 81%

Benthic diatom communities in high altitude lakes: a large scale study in the French Alps

Feret¹,

Bouchez²,

Rimet³

2017

Ann. Limnol. - Int. J. Lim.

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-Altitude lakes are weakly impacted by human activities. This makes them choice ecosystems to understand how biological communities are impacted by natural factors. This question was addressed to littoral benthic diatoms, a largely used ecological indicator. We wanted to know if benthic diatoms in lakes are more impacted by local varying factors (altitude, lake depth...) or regional varying factors (geology). The study area takes place in the Northern French Alps. Littoral benthic diatoms of 63 natural lakes situated between 1350 and 2700 m · a.s.l. were sampled. Two categories of communities were observed: one of deep and lower altitude lakes and one of higher altitude and shallower lakes. In each category, communities were characterized and were corresponding to particular lake types: lakes dominated by a particular geology, lakes with a water level fluctuation, turbid lakes,... Communities did not show a spatial structure. We observed that local factors were more important than regional factors. Indeed, the study area displayed a mixed geology even at a local level. On another hand, altitude a local varying factor determines freezing period a determining item of high-altitude lake functioning.

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Section: Local Factors Impact More Diatom Communities Composition Thamentioning

confidence: 81%

Benthic diatom communities in high altitude lakes: a large scale study in the French Alps

Feret¹,

Bouchez²,

Rimet³

2017

Ann. Limnol. - Int. J. Lim.

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“…In ice-covered lakes diatoms are especially sensitive to the changes in growing season (i.e. period of icecover) and habitat availability (e.g., Smol 1988;Sorvari and Korhola 1998;Lotter and Bigler 2000;Korhola et al 2002;Sorvari et al 2002, Ru¨hland et al 2003. Planktonic taxa (e.g.…”

Section: Mitrofanovskoe Lakementioning

confidence: 99%

Palaeolimnological evidence for recent climatic change in lakes from the northern Urals, arctic Russia

et al. 2005

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The recent sediments from two deep arctic lakes, Mitrofanovskoe and Vanuk-ty, situated in the permafrost belt within the Bol'shezemel'skaya Tundra in the northern Ural region, were studied for diatoms, chironomids, spheroidal carbonaceous particles and stable lead isotopes. The magnitudes and rates-of-change in diatom and chironomid assemblages were numerically estimated. Instrumental climate records were used to assess statistically the amount of variance in diatom and chironomid data explained by temperature. August and September air temperatures have a statistically significant effect on diatom composition at both lakes. At Mitrofanovskoe Lake, major compositional changes in diatom and chironomid assemblages occurred at the turn of the 20th century and might be related to the regional increase in temperature. Chironomidinferred air temperature also increased by approximately 1°C since the early 1900s. At both lakes diatom compositional changes, coincident with the increase in June and September temperatures, also occurred in the late 1960s. These compositional changes are correlated with the increase in diatom production, sediment organic content and diatom species richness, and are likely to be a diatom response to the lengthening of the growing season. These changes are also correlated with the circum-Arctic temperature increase from the 1960s. A chironomid response to the late 1960s temperature increase was less pronounced at both lakes. Pollution levels are relatively low and pollution history is unrelated to ecological changes. Both lead isotopes and spheroidal carbonaceous particles show a clear atmospheric pollution signal, peaking in the 1980s.

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“…Differences in the life-forms (e.g. planktonic and non-planktonic diatom ratios) have been used for reconstructions of lake-level changes (Barker et al 1994;Yang & DutHie 1995;lotter & Bigler 2000;, moos et al 2005). Changing water levels in a lake will alter the number and diversity of microhabitats.…”

Section: Introductionmentioning

confidence: 99%

Linking spatial distributions of sediment diatom assemblages with hydrological depth profiles in a plateau deep-water lake system of subtropical China.

Wang¹,

Yang²,

Hamilton³

et al. 2012

Fottea

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Abstract:The spatial distributions of approximately 160 diatom taxa from surface sediments of the plateau deep-water Lugu Lake were investigated. The results exhibited a change in the sediment diatom composition with increasing water depth. The main patterns of variation, derived from a principal component analysis (PCA) and detrended correspondence analysis (DCA), showed that diatom community composition was divided into three depth gradients (near-shore zone; mid-depth zone; profundal deep zone). With increasing depth, the pattern of predominantly periphytic taxa in the shallow waters changed to planktonic assemblages dominated by Cyclotella ocellata, Asterionella formosa and Cyclostephanos dubius. Diatom species diversity decreased from the shallow near-shore zone to the deeper open waters. In addition, there was an increase in the ratio of planktonic to periphytic diatoms at depths >30 m. These distinct spatial patterns in diatom distribution are clear markers of current water levels within Lake Lugu and represent a benchmark for evaluating paleolimnological changes in water levels, which can be an indirect proxy of regional climate in this monsoon region of southern Asia.

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Do diatoms in the Swiss Alps reflect the length of ice-cover?

Cited by 293 publications

References 22 publications

Benthic diatom communities in high altitude lakes: a large scale study in the French Alps

Benthic diatom communities in high altitude lakes: a large scale study in the French Alps

Palaeolimnological evidence for recent climatic change in lakes from the northern Urals, arctic Russia

Linking spatial distributions of sediment diatom assemblages with hydrological depth profiles in a plateau deep-water lake system of subtropical China.

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