Effects of multiple stressors on lakes in south-central Ontario: 15 years of change in lakewater chemistry and sedimentary diatom assemblages

Hadley, Kristopher R.; Paterson, Andrew M.; Hall, Roland I.; Smol, John P.

doi:10.1007/s00027-012-0280-5

Cited by 29 publications

(18 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other nearby subalpine lakes (lakes Como, Garda, Idro and Iseo in Italy and Lake Constance in Germany), which host similar diatom communities as the present study lakes, changes in lake trophic status over the last century resulted in similar changes in the diatom communities, with the same species successions as observed in the three studied lakes (Marchetto et al, 2004). Yet, interestingly, species dominating the diatom record over the last 30 years in lakes Geneva and Bourget (average relative abundances since 1980: 15-25% of A. formosa, 5-14% of D. tenuis, 18-20% of Fragilaria) are not normally related to lake nutrient status (Rimet, Druart & Anneville, 2009;Hadley et al, 2013), highlighting the importance of other factors driving recent changes in diatom communities.…”

Section: Discussionsupporting

confidence: 55%

“…Cyclotella dominance during earlier stratification phase in oligotrophic lakes might be replaced by A. formosa, S. parvus and A. islandica in more nutrient-enriched lakes. As for Cyclotella, A. formosa morphology promotes its sinking resistance (Hadley et al, 2013) but since it is a better competitor that Cyclotella for phosphorus (Tilman, 1982), it should outcompete Cyclotella in more mesotrophic lakes during earlier stratification phases. Ecology of S. parvus and A. islandica is less known, but their optima are considered to be between mesotrophic and eutrophic lakes (Reynolds, 1997).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Sensitivity and responses of diatoms to climate warming in lakes heavily influenced by humans

et al. 2014

View full text Add to dashboard Cite

Summary Diatom communities have been shown to respond strongly to current climate warming in remote lakes, while evidence remains equivocal for lakes under strong local human pressures. Temporal dynamics of planktonic diatoms in three subalpine lakes (Geneva, Annecy and Bourget) reconstructed from palaeolimnological approaches were used to assess the relative effects of phosphorus concentrations, fisheries management practices and climate warming in structuring communities over the last century. Changes in total phosphorous concentration (TP), air temperature and fish predation pressure could explain the temporal dynamics of most diatom species in the sediment records. TP was found to be not only the main driver of changes in community composition but also an important factor modulating diatom sensitivity and responses to climate warming. The diatom community of Lake Bourget showed the highest vulnerability and direct responses to climate warming, favouring spring species that can resist earlier stratification in mesotrophic lakes (such as Asterionella formosa, Aulacoseira islandica and Stephanodiscus parvus) and summer species that can make the best trade‐off between decreasing nutrient concentrations and increased water column stability (Diatoma tenuis, A. islandica). In Lake Geneva, climate warming also contributed to shaping diatom communities but through an indirect pathway; fisheries management practices and climate warming interacted to reinforce top‐down control, favouring large, colonial inedible species (Stephanodicus binderanus and A. formosa). For Lake Annecy, the most nutrient limited of the three lakes studied, no changes in diatom community structure were directly related to warmer air temperatures over the last 25 years. All three lakes have been subjected to the same climate variability. Yet the magnitude and responses of their diatom communities to climate warming were dissimilar and strongly modulated by differences in lake trophic status and fish management practices.

show abstract

Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Sensitivity and responses of diatoms to climate warming in lakes heavily influenced by humans

et al. 2014

View full text Add to dashboard Cite

show abstract

“…3). Cyclotella taxa, such as D. stelligera, are known to become more competitive as the water column stratifies with warming (Rühland et al 2008(Rühland et al , 2013(Rühland et al , 2015Hadley et al 2013;Hobbs et al 2010). In their meta-analysis of over 200 northern hemisphere lakes, Rühland et al (2008) defined a Cyclotella species rise as an increase [5 % above background relative abundance.…”

Section: Discussionmentioning

confidence: 99%

Climate-driven changes in lakes from the Peruvian Andes

et al. 2015

Self Cite

View full text Add to dashboard Cite

The consequences of recent warming in the Andes have been dramatic, most iconically visualized by the rapid retreat of tropical mountain glaciers. Of all the ecosystems in the tropical Andes, lakes have received amongst the least research attention. We examined subfossil diatom and chrysophyte assemblages to chronicle recent (past *150 years) ecological change in lakes from the Peruvian Andes. We recorded abrupt increases in planktonic diatoms and scaled chrysophytes beginning in the early 1900s. These changes are consistent with enhanced periods of thermal stratification, brought on by rising temperatures that have been documented throughout the Andes. These data indicate that ecological and likely physical limnological changes associated with Anthropocene warming are already under way in tropical high mountain lakes.

show abstract

“…Using water column temperatures predicted by the DYRESM model, the duration of stratification in Harp Lake has increased by only ~5 days since 1979 (Figure ) compared with 33–56 days in Cook's Bay, Kempenfelt Bay and the main basin of Lake Simcoe and 20 days in Lake Washington, over a similar time period (Winder and Schindler, ; Stainsby et al ., ). Despite significantly higher thermal stability in Harp Lake after the 1996 breakpoint, which coincides with a significant breakpoint in regional ice‐off data (Hadley et al ., ), no significant difference was found in the timing of the onset, breakdown or duration of thermal stratification from 1979 to 2009 on the basis of monotonic, linear or BPA trend tests (Table ). The lack of significant trends in solar forcing and mean air temperature may partially explain why we have not seen trends in the onset and breakdown of stratification in Harp Lake (Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…Overall, the Harp Lake application reinforces the usefulness of one‐dimensional hydrodynamics models, such as DYRESM, in boreal systems. Interestingly, while the breakpoint in our modelled thermal stability data coincided with regional trends in ice‐off data (Hadley et al ., ; Yao et al ., ), changes in the duration of stratification were not significant. Our data suggest that increased air temperatures and reduced mixing resulting from lower regional wind speed are the strongest predictors of increases in stability.…”

Section: Resultsmentioning

confidence: 99%

Climate warming alters thermal stability but not stratification phenology in a small north-temperate lake

et al. 2013

View full text Add to dashboard Cite

Abstract:Recent climate change represents one of the most serious anthropogenic threats to lake ecosystems in Canada. As meteorological and hydrological conditions are altered by climate change, so too are physical, chemical and biological properties of lakes. The ability to quantify the impact of climate change on the physical properties of lakes represents an integral step in estimating future chemical and biological change. To that end, we have used the dynamic reservoir simulation model, a one-dimensional vertical heat transfer and mixing model, to hindcast and compare lake temperature-depth profiles against 30 years of long-term monitoring data in Harp Lake, Ontario. These temperature profiles were used to calculate annual (June-September) thermal stability values from 1979 to 2009. Comparisons between measured and modelled lake water temperature and thermal stability over three decades showed strong correlation (r 2 > 0.9). However, despite significant increases in modelled thermal stability over the 30 year record, we found no significant change in the timing of the onset, breakdown or the duration of thermal stratification. Our data suggest that increased air temperature and decreased wind are the primary drivers of enhanced stability in Harp Lake since 1979. The high-predictive ability of the Harp Lake dynamic reservoir simulation model suggests that its use as a tool in future lake management projects is appropriate.

show abstract

Effects of multiple stressors on lakes in south-central Ontario: 15 years of change in lakewater chemistry and sedimentary diatom assemblages

Cited by 29 publications

References 46 publications

Sensitivity and responses of diatoms to climate warming in lakes heavily influenced by humans

Sensitivity and responses of diatoms to climate warming in lakes heavily influenced by humans

Climate-driven changes in lakes from the Peruvian Andes

Climate warming alters thermal stability but not stratification phenology in a small north-temperate lake

Contact Info

Product

Resources

About