Temporal changes in cladoceran assemblages subjected to a low calcium environment: combining the sediment record with long-term monitoring data

Redmond, Laura E.; Jeziorski, Adam; Paterson, Andrew M.; Rusak, James A.; Smol, John P.

doi:10.1007/s10750-016-2737-3

Cited by 5 publications

(3 citation statements)

References 55 publications

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“…Holopedium is tolerant of low pH and common in acidified lakes (Havas and Likens 1985;Waervågen et al 2002). However, recent analyses of direct monitoring data and paleolimnological records have identified increases in the relative abundance of Holopedium in lakes recovering from acidification (Jeziorski et al 2015;Redmond et al 2016). By combining structural equation modeling, paleolimnological analyses and long-term direct limnological records spanning three decades for a set of lakes on the Precambrian Shield, it was demonstrated that recent Holopedium increases are indirectly attributable to reduced Ca availability, as lower Ca concentrations reduced the populations of large Ca-rich daphniids, freeing up food resources for Holopedium (Jeziorski et al 2015).…”

Section: Identifying Taxa Favoured By Lower Lakewater Ca Concentrationsmentioning

confidence: 99%

The ecological impacts of lakewater calcium decline on softwater boreal ecosystems

Jeziorski

Smol

2017

Environ. Rev.

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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 impacts of lower Ca concentrations in freshwater systems have largely focused on Ca-rich members of the Cladocera; however, a growing body of work, spanning several scientific fields, suggests Ca decline will have profound direct and indirect consequences for aquatic ecosystems. Here, we synthesize recent laboratory analyses and field surveys to provide an overview of these consequences, while highlighting paleolimnological investigations that provide some long-term perspective on the phenomenon. However, considerable questions remain regarding ‘baseline’ or pre-impact conditions, due to the accelerated leaching of Ca from watershed soils during the period of anthropogenic influence. Furthermore, catchment-specific differences in both leaching rates and the initial size of the Ca pool in watershed soils complicate determination of the eventual endpoints of the declines. Despite these uncertainties, persistent low Ca concentrations are anticipated to impede biological recovery from lake acidification, and that ongoing declines will have cascading effects throughout aquatic ecosystems due to the loss of vulnerable taxa. To better understand how reduced Ca availability will continue to change affected surface waters and how these changes will interact with other environmental stressors will require continued investigation of the declines from multiple scientific perspectives.

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Section: Identifying Taxa Favoured By Lower Lakewater Ca Concentrationsmentioning

confidence: 99%

The ecological impacts of lakewater calcium decline on softwater boreal ecosystems

Jeziorski

Smol

2017

Environ. Rev.

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“…A combination of low Ca, relatively low pH, and high Secchi disk depth (which could result in thermal or UV stress; Hessen and Rukke 2000; Ashforth and Yan 2008) may prevent the establishment of large populations of the D. pulex complex in Killarney lakes. In our remaining low-Ca lakes, the D. pulex complex was mostly represented by D. catawba or D. minnehaha, which are more tolerant of low-Ca, acidic conditions than D. pulex (Redmond et al 2016;Azan and Arnott 2018).…”

Section: Generalist Taxa Dominated Sudbury Cladoceran Assemblagesmentioning

confidence: 95%

Linking changes in sedimentary Cladocera assemblages to limnological variables in 67 Sudbury (Ontario, Canada) lakes reflecting various degrees of metal smelter impacts

Simmatis

Paterson

Edwards

et al. 2021

Can. J. Fish. Aquat. Sci.

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Despite extensive records of chemical recovery, relatively little is known about recovery of aquatic biota in Sudbury (Ontario, Canada). Cladocera (Branchiopoda) are key components of lake food webs and understanding spatial patterns in their assemblages may emphasize ecosystem recovery challenges. Paleolimnological techniques complement and provide long-term context to modern monitoring. Cladoceran remains from the surface sediments of 67 lakes across a gradient of smelter impacts were examined to determine which measured limnological factors mostly influenced assemblage composition. Lakes were divided into four categories by acidification histories and location: Acidified (pH <6) Urban, Acidified Non-urban, Acidified Killarney, and Reference (pH >6) lakes. Specific conductance, nutrients, alkalinity, and lake depth significantly structured assemblages. Most assemblages were dominated by generalist taxa. Relative abundances of Alona taxa varied strongly along alkalinity and pH gradients. Lakes with high metal concentrations were generally less diverse and dominated by generalist taxa, although metals often co-occurred with other stressors. Recovery targets could be affected by these chemical factors. These data provide useful information for future environmental inferences from cladocerans in metal smelting regions.

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“…By combining in situ monitoring with palaeolimnological study, we can assess whether current ecological states and shorter term trends depart from longer term trajectories, and whether they represent unprecedented conditions or recovery to a notional historical baseline. Such an approach has recently been demonstrated for lake organic carbon concentrations responding to land‐use change (Meyer‐Jacob, Tolu, Bigler, Yang, & Bindler, 2015) and cladoceran assemblages responding to declining calcium concentrations (Redmond, Jeziorski, Paterson, Rusak, & Smol, 2016). Over shorter temporal scales, combined high‐resolution sensor and traditional in situ monitoring allows us to resolve lagged ecosystem‐scale responses to short‐lived antecedent weather extremes (de Eyto et al, 2016).…”

Section: A Conceptual Framework For Research Integrationmentioning

confidence: 99%

The case for research integration, from genomics to remote sensing, to understand biodiversity change and functional dynamics in the world's lakes

Thackeray

Hampton

2020

Global Change Biology

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Freshwater ecosystems are heavily impacted by multiple stressors, and a freshwater biodiversity crisis is underway. This realization has prompted calls to integrate global freshwater ecosystem data, including traditional taxonomic and newer types of data (e.g., eDNA, remote sensing), to more comprehensively assess change among systems, regions, and organism groups. We argue that data integration should be done, not only with the important purpose of filling gaps in spatial, temporal, and organismal representation, but also with a more ambitious goal: to study fundamental cross-scale biological phenomena. Such knowledge is critical for discerning and projecting ecosystem functional dynamics, a realm of study where generalizations may be more tractable than those relying on taxonomic specificity. Integration could take us beyond cataloging biodiversity losses, and toward predicting ecosystem change more broadly. Fundamental biology questions should be central to integrative, interdisciplinary research on causal ecological mechanisms, combining traditional measures and more novel methods at the leading edge of the biological sciences. We propose a conceptual framework supporting this vision, identifying key questions and uncertainties associated with realizing this research potential. Our framework includes five interdisciplinary "complementarities." First, research approaches may provide comparative complementarity when they offer separate realizations of the same focal phenomenon. Second, for translational complementarity, data from one research approach is used to translate that from another, facilitating new inferences.Thirdly, causal complementarity arises when combining approaches allows us to "fill in" cause-effect relationships. Fourth, contextual complementarity is realized when together research methodologies establish the wider ecological and spatiotemporal context within which focal biological responses occur. Finally, integration may allow us to cross inferential scales through scaling complementarity. Explicitly identifying the modes and purposes of integrating research approaches, and reaching across disciplines to establish appropriate collaboration will allow researchers to address major biological questions that are more than the sum of the parts. K E Y W O R D S harmful algal blooms, interdisciplinarity, limnology, monitoring, palaeolimnology, spatial scale, temporal scale THACKERAY And HAMPTOn | 3231 1 | INTRODUC TI ON Freshwaters face significant, and multiple pressures which are already having a discernible impact upon biodiversity, ecosystem processes and states, and ecosystem services (Jackson, Loewen, Vinebrooke, How to cite this article: Thackeray SJ, Hampton SE. The case for research integration, from genomics to remote sensing, to understand biodiversity change and functional dynamics in the world's lakes. Glob Change Biol. 2020;26:3230-3240. https://

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Temporal changes in cladoceran assemblages subjected to a low calcium environment: combining the sediment record with long-term monitoring data

Cited by 5 publications

References 55 publications

The ecological impacts of lakewater calcium decline on softwater boreal ecosystems

The ecological impacts of lakewater calcium decline on softwater boreal ecosystems

Linking changes in sedimentary Cladocera assemblages to limnological variables in 67 Sudbury (Ontario, Canada) lakes reflecting various degrees of metal smelter impacts

The case for research integration, from genomics to remote sensing, to understand biodiversity change and functional dynamics in the world's lakes

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