Using Daphnia physiology to drive food web dynamics: A theoretical revisit of Lotka-Volterra models

Perhar, Gurbir; Kelly, Noreen E.; Ni, Felicity J.; Simpson, Myrna J.; Simpson, André J.; Arhonditsis, George B.

doi:10.1016/j.ecoinf.2016.07.001

Cited by 13 publications

(6 citation statements)

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“…Daphnia magna is a small crustacean, which is a prevalent keystone species in various freshwater aquatic ecosystems and has been used to assess pollutant toxicity on aquatic life [ 14 , 15 , 16 , 17 ]. They occupy an intermediate position in the food web, are ubiquitous, highly sensitive to toxicants, easy to culture, fast growing, and have a short lifespan, making them suitable organisms for ecotoxicity tests and the analysis of aquatic ecological food webs [ 18 , 19 ]. Because of this, environmental metabolomic studies using D. magna and related species have increased substantially [ 18 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, PFOS, when present in a pollutant mixture, can alter the toxicity of other pollutants and exacerbate the overall toxic response [ 30 ]. Furthermore, the impairments caused by PFOS can last for several generations [ 29 ], suggesting that chronic exposure will severely alter Daphnia population dynamics and possibly higher trophic levels [ 19 ]. Wagner et al [ 27 ] compared metabolic profiles of juvenile and adult daphnids after an acute exposure (48 h) to sub-lethal PFOS.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Sub-Lethal Toxicity of Perfluorooctane Sulfonate (PFOS) to Daphnia magna Using 1H Nuclear Magnetic Resonance-Based Metabolomics

et al. 2017

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1H nuclear magnetic resonance (NMR)-based metabolomics was used to characterize the response of Daphnia magna after sub-lethal exposure to perfluorooctane sulfonate (PFOS), a commonly found environmental pollutant in freshwater ecosystems. Principal component analysis (PCA) scores plots showed significant separation in the exposed samples relative to the controls. Partial least squares (PLS) regression analysis revealed a strong linear correlation between the overall metabolic response and PFOS exposure concentration. More detailed analysis showed that the toxic mode of action is metabolite-specific with some metabolites exhibiting a non-monotonic response with higher PFOS exposure concentrations. Our study indicates that PFOS exposure disrupts various energy metabolism pathways and also enhances protein degradation. Overall, we identified several metabolites that are sensitive to PFOS exposure and may be used as bioindicators of D. magna health. In addition, this study also highlights the important utility of environmental metabolomic methods when attempting to elucidate acute and sub-lethal pollutant stressors on keystone organisms such as D. magna.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Sub-Lethal Toxicity of Perfluorooctane Sulfonate (PFOS) to Daphnia magna Using 1H Nuclear Magnetic Resonance-Based Metabolomics

et al. 2017

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“…Interacting species in uniform [16][17][18][19][20] or fragmented [6,13,21] landscapes have been extensively explored with Lotka-Volterra models, a paradigmatic framework in population dynamics [22][23][24][25]. Individual mobility is a key aspect in this approach, and it is usually modeled by standard random walks without long-range displacements (but see [26]).…”

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confidence: 99%

Lévy flight movements prevent extinctions and maximize population abundances in fragile Lotka–Volterra systems

Dannemann

Boyer

Miramontes

2018

Proc. Natl. Acad. Sci. U.S.A.

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Multiple-scale mobility is ubiquitous in nature and has become instrumental for understanding and modeling animal foraging behavior. However, the impact of individual movements on the long-term stability of populations remains largely unexplored. We analyze deterministic and stochastic Lotka-Volterra systems, where mobile predators consume scarce resources (prey) confined in patches. In fragile systems (that is, those unfavorable to species coexistence), the predator species has a maximized abundance and is resilient to degraded prey conditions when individual mobility is multiple scaled. Within the Lévy flight model, highly superdiffusive foragers rarely encounter prey patches and go extinct, whereas normally diffusing foragers tend to proliferate within patches, causing extinctions by overexploitation. Lévy flights of intermediate index allow a sustainable balance between patch exploitation and regeneration over wide ranges of demographic rates. Our analytical and simulated results can explain field observations and suggest that scale-free random movements are an important mechanism by which entire populations adapt to scarcity in fragmented ecosystems.

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“…However, the binary mixture displayed different metabolic responses compared with the individual contaminants, and thus the authors concluded that the binary mixture may not have the same mode of action as the individual contaminants (Baylay et al 2012). Given that these metabolic responses do not always correspond to the predicted mixture toxicity, it is important to continue to examine these molecular responses, and to potentially identify predictable patterns that could be used in ecological risk assessments (Altenburger et al 2012;Davis et al 2016) or population dynamic models (Peace et al 2016;Perhar et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Sublethal metabolic responses to contaminant mixture toxicity in Daphnia magna

Wagner

Simpson

2018

Environmental Toxicology and Chemistry

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Anthropogenic activity is increasing the presence of contaminants that enter waterways through wastewater effluent and urban and/or agricultural runoff, generally in complex mixtures. Depending on the mode of action of the individual contaminant within the mixture, toxicity can occur due to contaminants having similar or dissimilar modes of action. However, it is unknown how the metabolome responds to sublethal contaminant mixtures in the keystone genus Daphnia. In the present study we examined D. magna metabolic responses to acute sublethal exposure of propranolol, carbamazepine, and perfluorooctanesulfonic acid (PFOS) as well as in binary (propranolol-carbamazepine, propranolol-PFOS, carbamazepine-PFOS) and tertiary mixtures (carbamazepine-propranolol-PFOS), all at 10% of the median lethal concentration of the population (LC50). The metabolome was measured using H nuclear magnetic resonance (NMR) and characterized using principal component analysis, regression analysis, and fold changes in metabolite relative to the unexposed (control) group. The averaged principal component analysis scores plots revealed that carbamazepine-PFOS and carbamazepine-propranolol-PFOS exposures were significantly different from the control treatment. After normalizing the toxicity of each contaminant, we found that some metabolites responded monotonically, whereas others displayed a nonmonotonic response with increasing toxicity units. The single contaminant exposures and 2 binary mixtures (propranolol-carbamazepine, and propranolol-PFOS) resulted in minimal changes in the identified metabolites, whereas the carbamazepine-PFOS and carbamazepine-propranolol-PFOS displayed increases in several amino acid metabolites and decreases in glucose. Overall, our results highlight the sensitivity of the metabolome to distinguish the composition of the contaminant mixtures, with some mixtures displaying heightened responses versus others. Environ Toxicol Chem 2018;37:2448-2457. © 2018 SETAC.

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Using Daphnia physiology to drive food web dynamics: A theoretical revisit of Lotka-Volterra models

Cited by 13 publications

References 54 publications

Analysis of Sub-Lethal Toxicity of Perfluorooctane Sulfonate (PFOS) to Daphnia magna Using 1H Nuclear Magnetic Resonance-Based Metabolomics

Analysis of Sub-Lethal Toxicity of Perfluorooctane Sulfonate (PFOS) to Daphnia magna Using 1H Nuclear Magnetic Resonance-Based Metabolomics

Lévy flight movements prevent extinctions and maximize population abundances in fragile Lotka–Volterra systems

Sublethal metabolic responses to contaminant mixture toxicity in Daphnia magna

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