Adam JeziorskiQueen's University | QueensU · Department of Biology
Adam Jeziorski
PhD
About
46
Publications
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1,284
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Introduction
Additional affiliations
April 2011 - present
July 2005 - August 2006
Ontario Ministry of the Environment, Dorset, Canada
Position
- Technician
Education
September 2006 - March 2011
January 2003 - February 2005
September 1996 - April 2001
Publications
Publications (46)
Calcium concentrations are now commonly declining in softwater boreal lakes. Although the mechanisms leading to these declines
are generally well known, the consequences for the aquatic biota have not yet been reported. By examining crustacean zooplankton
remains preserved in lake sediment cores, we document near extirpations of calcium-rich Daphni...
The jellification of north temperate lakes. Calcium (Ca) concentrations are decreasing in softwater lakes across eastern North America and western Europe. Using long-term contemporary and palaeo-environmental field data, we show that this is precipitating a dramatic change in Canadian lakes: the replacement of previously dominant pelagic herbivores...
Calcium (Ca) is a major component of the crustacean zooplankton carapace. As crustacean zooplankton obtain most of their Ca from lake water, taxa with high Ca demands may be negatively affected if environmental Ca concentrations fall below thresholds necessary for adequate Ca uptake rates. Currently, Ca concentrations are falling in many soft-water...
The “Ring of Fire” in the Far North of Ontario (50–57° N, 79–94° W) is a region of growing economic and environmental interest due to recent mineral discoveries and the potential for resource development. Due to the remote location of the region, little
baseline ecological information is available to distinguish any environmental impacts of mine de...
Mercury (Hg) contamination in the environment is a persistent issue as emissions from industry are ongoing and legacy cycling is prolonged. To quantify total mercury (total Hg) and methylmercury (MeHg) concentrations in lake sediments across a wide suite of temperate to subarctic lakes, measurements and modeling were conducted for 320 sites across...
North temperate and boreal lakes are affected by a complex suite of anthropogenic stressors, yet little is known about how these ecosystems are faring across the most lake‐rich nation, Canada. The NSERC Canadian Lake Pulse Network is the first large‐scale national survey of its kind, with the aim of assessing the health of Canadian lakes, determine...
AnthropogenicClimateclimate changeClimate change and the recent increase ofSaharan dustSaharan dust depositionSaharan dust depositionare potentially affectingSierra NevadaSierra NevadaAlpine lakesalpine lakesLakes. In this chapter, we summarize the results of paleolimnological research conducted to track recent environmental and ecological changes...
Anthropogenic stressors affect lakes around the world, ranging in scale from catchment-specific pollutants to the global impacts of climate change. Canada has a large number and diversity of lakes, yet it is not well understood how, where, and when human impacts have affected these lakes at a national scale. The NSERC Canadian Lake Pulse Network so...
Peninsula Lake, Ontario, Canada, is a Precambrian Shield lake that has experienced many environmental stressors since European settlement of the watershed in the mid-1800s, including forest clearance, water-level management, sewage inputs, and land-use changes. The deterioration of water quality by the 1970s prompted mitigation efforts intended to...
Multiple stressors affect water quality and biodiversity in lakes worldwide. However, our understanding of which combinations of stressors are of greatest impact and how lakes have shifted from their pre-industrial baselines is fragmented. Questions remain regarding how multiple trophic groups are affected by global change stressors and whether reg...
• Cladocera serve as important bio‐ and paleo‐indicators of lake food webs and environmental conditions. The ecological optima of cladocerans are often established by regional‐scale calibration sets, with subsequent comparisons to limnological variables. However, due to logistical constraints when sampling large numbers of lakes, this approach ofte...
Simmatis B, Nelligan C, Rühland KM, Jeziorski A, Castro V, Paterson AM, Smol JP. 2020. Tracking ∼200 years of water quality in Muskrat Lake, a eutrophic lake trout lake in Ontario (Canada) with cyanobacterial blooms. Lake Reserv Manage. XX:XXX–XXX.
Muskrat Lake is a deep (64 m), eutrophic lake in southeastern Ontario, Canada, that supports a natura...
Nelligan C, Jeziorski A, Rühland KM, Paterson AM, Meyer-Jacob C, Smol JP. A multibasin comparison of historical water quality trends in Lake Manitou, Ontario, a provincially significant lake trout lake. Lake Reserv Manage. XX:XX–XX.
Lake Manitou, on Manitoulin Island (Ontario, Canada), is a two-basin lake that supports a natural lake trout populati...
Temperature–oxygen profiles, collected biweekly to monthly for ∼40 years, were used to calculate end-of-summer volume-weighted hypolimnetic oxygen (VWHO) concentrations in six small lakes located in south-central Ontario, Canada. Coherent decreases in thermocline depth and increases in hypolimnetic volume, mean hypolimnetic dissolved oxygen (DO) co...
Simmatis B, Jeziorski A, Zemanek A, Selbie DT, Hyatt K, Fryer JK, Cumming BF, Smol JP. 2018. Long-term reconstruction of deep-water oxygen conditions in Osoyoos Lake: implications for Okanagan River sockeye salmon. Lake Reserve Manage. 34:392–400.
Osoyoos Lake is the primary nursery lake supporting sockeye salmon (Onchorhynchus nerka) originating f...
Effluent from diamond mining operations rich in calcium (Ca) has transformed softwater tundra lakes in the Northwest Territories, Canada. Lakes downstream of the Dominion Diamond Corporation Ekati Mine have experienced marked changes in water chemistry and cladoceran community composition since establishment of the mine in 1998. The greatest change...
Recent anthropogenic climate change and the exponential increase over the past few decades of Saharan dust deposition, containing ecologically important inputs of phosphorus (P) and calcium (Ca), are potentially affecting remote aquatic ecosystems. In this study, we examine changes in cladoceran assemblage composition and chlorophyll-a concentratio...
Lake Trout live within narrow temperature and dissolved oxygen (DO) boundaries in the hypolimnia of stratified lakes. These species are vulnerable to environmental stressors including climate warming, which will deepen the thermocline and increase the duration and strength of thermal stratification. These processes exacerbate hypolimnetic hypoxia;...
In recent decades, marked declines in calcium (Ca) concentrations have been noted in many softwater boreal lakes, and are believed to be a long-term consequence of acid deposition as well as other stressors (such as timber harvesting). Reduced Ca availability may act as a potent environmental stressor. Investigations of the direct ecological impact...
The extensive peatlands and lakes of the Far North of Ontario warrant committed scientific attention given their status as a significant carbon sink. Economic interest in this region has recently increased due to the discovery of vast mineral deposits (mainly chromite and nickel) known as the “Ring of Fire”. Mineral exploration and infrastructure p...
Lakewater calcium (Ca) decline affects softwater lakes across the Canadian Shield. Ca decline is one consequence of acid deposition, and has impeded biological recovery in formerly acidified lakes. Reduced Ca availability may advantage taxa better adapted to low Ca waters. Crosson Lake in south-central Ontario (Canada) has an extensive monitoring r...
Nelligan C, Jeziorski A, Rühland KM, Paterson AM, Smol JP. 2016. Managing lake trout lakes in a warming world: A paleolimnological assessment of nutrients and lake production at three Ontario sites. Lake Reserve Manage. 00:1−14.
Recent declines in hypolimnetic dissolved oxygen (DO) concentrations in many lakes throughout Ontario have prompted conce...
In response to biotic and abiotic cues, the cladoceran genus Bosmina can undergo changes in body size and appendage length and shape over successive generations. To improve our understanding of the environmental controls on Bosmina size structure, we used paleolimnological techniques to examine Bosmina size responses to the extreme acidification an...
Lake Trout are a rare and valuable natural resource that are threatened by multiple environmental stressors. With the added threat of climate warming, there is growing concern among resource managers that increased thermal stratification will reduce the habitat quality of deep-water Lake Trout lakes through enhanced oxygen depletion. To address thi...
Lake Trout are a rare and valuable natural resource that are threatened by multiple environmental stressors. With the added threat of climate warming, there is growing concern among resource managers that increased thermal stratification will reduce the habitat quality of deep-water Lake Trout lakes through enhanced oxygen depletion. To address thi...
Lakes near S udbury, C anada, have been exposed to intense acidification and metal contamination from nearby mining and smelting operations. Although lakewater p H improved substantially following the implementation of emission controls in the late 1960s, biological recovery continues to lag behind chemical recovery.
We assessed the current state o...
In recent decades, softwater lakes across Canada have experienced a wide array of anthropogenic influences, with acidification and climate warming of particular concern. Here, we compare modern and pre-industrial sedimentary diatom assemblages from 36 softwater lakes located on the Canadian Shield in south-central Ontario to determine whether lake...
In the mid-20th century, similar to many lakes in the vicinity of Sudbury, Canada, Middle Lake was severely acidified due to nearby smelting operations. However, this lake is of particular interest because it was limed in 1973, and later fertilized as part of a restoration effort. Here, we use paleolimnological methods to track cladoceran assemblag...
A multi-proxy paleolimnological survey was performed on 13 lakes in the Hudson Bay Lowlands (HBL) of northern Ontario in order to provide a regional analysis of recent environmental changes in this poorly studied sub-Arctic region. In contrast to the amplified warming experienced by most of the circumpolar Arctic since the mid-19th century, the cli...
Calcium (Ca) concentrations of many softwater lakes on the Canadian Shield have been in decline for decades as a response primarily to regional acid deposition and repeated cycles of forest harvesting. These Ca declines are of ecological interest, as many lakes have fallen to Ca levels detrimental to the fitness of ecologically important Ca-rich cl...
In the region northeast of Wawa, Ontario (Canada), many circumneutral lakes downwind of a nearby iron-sintering plant were strongly acidified (pH 3–4) in response to the emissions of large amounts of sulfur dioxide from 1939–1998. Following closure of the plant in 1998, lakewater pH has returned to circumneutral conditions due to the high buffering...
Aqueous calcium (Ca) concentrations are currently decreasing in many softwater lakes on the Boreal Shield. As the onset of these declines often pre-date direct monitoring programs, indirect techniques are required to examine the impacts of reduced Ca availability on aquatic communities with relatively high Ca demands such as the Cladocera (Class: B...
Declines in lakewater calcium (Ca) concentrations are occurring in many softwater lakes of the Canadian Shield, and likely
elsewhere, and there is growing interest regarding the potential impacts that reduced Ca availability may have on aquatic
ecosystems. Here, we test the hypotheses that the Ca limitations of Daphnia pulex (reduced growth/surviva...
Aqueous calcium (Ca) concentrations are declining in softwater lakes of the Canadian Shield largely because of decades of
acid deposition and afforestation following timber harvesting. Populations of pelagic cladoceran taxa with high Ca requirements,
especially Daphnia spp., are declining in response to reduced aqueous Ca availability. However, the...
Daphnia subfossils from lake sediments are useful for exploring the impacts of environmental stressors on aquatic ecosystems. Unfortunately,
taxonomic resolution of Daphnia remains is coarse, as only a small portion of the animal is preserved, and so the identification of daphniid subfossils typically
relies upon postabdominal claws. Daphniid claws...
Lake water calcium (Ca) decline has recently been recognized as a stressor impacting softwater lake districts that have experienced long-term patterns of acid deposition and/or timber harvesting. Declining aqueous Ca levels may impact the survival of aquatic biota, particularly Ca-rich cladoceran taxa such as daphniids. Daphnia pulex are sensitive...
In recent decades, many softwater lakes on the boreal shield have experienced significant reductions in aqueous calcium (Ca) concentrations. These declines are a long-term consequence of acid deposition due to the depletion of base cations from watershed soils. There is concern that in some lakes [Ca] may be falling to levels detrimental to the com...
The effects of low counts on assemblage inferences in paleolimnological investigations have been examined for many biological
proxies, but not yet for Cladocera. Established guidelines leading to the determination of an adequate, minimum count are
absent with respect to sampling cladoceran remains from lake sediments. Using simulated subsamples der...
In most Ontario lakes, phosphorus is present in trace quantities, making the precise measurement of concentrations difficult. The considerable variation that results in many datasets can be attributed to imprecise analysis. Even with precise analysis, substantial variation in ice-free whole-lake, mean mixed layer, and spring turnover total phosphor...
Recent but widespread observations of aqueous calcium (Ca) declines in softwater lakes/ponds have spurred research on Ca-rich crustacean zooplankton as paleoindicators of the ecological consequences of Ca declines attributable to acidification, forestry, and other environmental stressors.
Despite reductions in atmospheric sulphur emissions and the resulting decline in acidic deposition, many lakes on the Canadian
Shield that have experienced acidification are either recovering at a rate slower than expected or not recovering at all.
This lack of recovery is believed to be partly the consequence of the depletion of exchangeable base...
We assess Holocene environmental change at alpine Lake Njulla(6822N, 1842E, 999 m a.s.l.) innorthernmost Sweden using sedimentary remains of chironomid head capsules anddiatoms. We apply regional calibration sets to quantitatively reconstruct meanJuly air temperature (using chironomids and diatoms) and lake-water pH(using diatoms). Both chironomids...