Examination of temporal DDT trends in Lake Erie fish communities using dynamic linear modeling

Mahmood, Maryam; Bhavsar, Satyendra P.; Arhonditsis, George B.

doi:10.1016/j.jglr.2013.06.013

Cited by 11 publications

(5 citation statements)

References 69 publications

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“…Based on Bayes’ theorem, the sequential DLM updating makes a forecast for time t using prior knowledge (e.g. literature information, observations at time t −1 or earlier) on model parameters and data observed at time t (Mahmood, Bhavsar, & Arhonditsis, ). The discount factor is applied to this iterative process, such that older observations are weighted less than newer ones.…”

Section: Methodsmentioning

confidence: 99%

Nutrient management and structural shifts in fish assemblages: Lessons learned from an Area of Concern in Lake Ontario

et al. 2019

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While total phosphorus (TP) is a critical determinant of freshwater ecosystem productivity, multiple stressors can induce shifts in energy pathways, with profound implications for ecosystem and fishery restoration. The Bay of Quinte (Lake Ontario, Canada) is a Great Lakes nearshore ecosystem that has been historically subjected to a variety of environmental perturbations: cultural eutrophication, low dissolved oxygen, reduced fisheries, climatic extremes, phosphorus (P) abatement, and aquatic invasive species. We used the Bay of Quinte to study how trophic state alterations affect fish assemblages in Great Lakes nearshore environments by examining the response of fish biomass to TP concentration variability in the presence of multiple stressors. Our analysis is based on a 42‐year (1972–2013) dataset from the Bay of Quinte for water quality through the food web to fishes. We employed a series of statistical tools that can offer insights into the structural changes induced by the events examined. We first used dynamic linear modelling to detect temporal trends in fish biomass, while accounting for year‐to‐year TP variability over three spatial segments of the bay. We then developed piecewise regression models to assess the extent to which specific ecological events induced distinct shifts in the fish assemblage. Multiple regression modelling was used to quantify the relative importance of TP, zooplankton, and surface water temperature on fish biomass. Based on gillnets, there were consistent fish biomass changes across the bay with increased biomass before P control (1972–1977), declines after P control followed by the establishment of a steady state or modest increase (1978–1994), and a declining trajectory during the recent period (1995–2013). Even when accounting for the role of water temperature and zooplankton, TP still had a significant effect on fish biomass. However, the strength and nature of the relationship varied among fish groups, and overall, the effect of TP on fish biomass has weakened in recent years. Our models show that fish biomass in the Bay of Quinte is shaped by the year‐to‐year TP variability. However, the relationship between P and fish abundance has been modulated by various ecological events with the consequence that the Bay of Quinte fish assemblage has changed and the food web now produces less fish biomass per unit of TP. A projected reduction of mean ambient TP levels from 30 to 25 μg/L, is expected to induce a 24% decline in total fish biomass, and further shift the fish assemblage with the biomass of planktivores and walleye declining by >60% and 30%, respectively. Recreational fishing provides important economic benefits in the Bay of Quinte, through tourism and other local business operations. Recognising the economic importance of fishing, our analysis provides critical insights regarding the on‐going management efforts to reduce external nutrient loadings (point and non‐point sources, urban storm water) and further lower ambient TP levels and primary productivity. The...

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Section: Methodsmentioning

confidence: 99%

Nutrient management and structural shifts in fish assemblages: Lessons learned from an Area of Concern in Lake Ontario

et al. 2019

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“…Widespread bans on their production initially lowered environmental POP levels [6][7][8][9] , but reductions have slowed or ceased more recently [10][11][12][13] . Legacy POPs are thus ubiquitous in the marine environment and remain a serious concern for top predators, in which biomagnification produces the highest burdens 4,11,[14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

“…The impact of environmental and organismal accumulation of man-made chemicals is a growing global challenge. , Persistent organic pollutants (POPs) are toxic, accumulate in living tissues, and resist biological and chemical degradation . Widespread bans on their production initially lowered environmental POP levels, − but reductions have slowed or ceased more recently. − Legacy POPs are thus ubiquitous in the marine environment and remain a serious concern for top predators, in which biomagnification produces the highest burdens. ,,− …”

Section: Introductionmentioning

confidence: 99%

Persistent Organic Pollutant Burden, Experimental POP Exposure, and Tissue Properties Affect Metabolic Profiles of Blubber from Gray Seal Pups

Robinson

Hall

Debier

et al. 2018

Environ. Sci. Technol.

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Persistent organic pollutants (POPs) are toxic, ubiquitous, resist breakdown, bioaccumulate in living tissue and biomagnify in food webs. POPs can also alter energy balance in humans and wildlife. Marine mammals experience high POP concentrations, but consequences for their tissue metabolic characteristics are unknown. We used blubber explants from wild, grey seal (Halichoerus grypus) pups to examine impacts of intrinsic tissue POP burden and acute experimental POP exposure on adipose metabolic characteristics. Glucose use, lactate production and lipolytic rate differed between matched inner and outer blubber explants from the same individuals and between feeding and natural fasting. Glucose use decreased with blubber dioxin-like PCBs (DL-PCB) and increased with acute experimental POP exposure. Lactate production increased with DL-PCBs during feeding, but decreased with DL-PCBs during fasting. Lipolytic rate increased with blubber dichlorodiphenyltrichloroethane (DDT) and its metabolites (DDX) in fasting animals, but declined with DDX when animals were feeding. Our data show that POP burdens are high enough in seal pups to alter adipose function early in life, when fat deposition and mobilisation are vital. Such POP-induced alterations to adipose glucose use may significantly alter energy balance regulation in marine top predators with the potential for long term impacts on fitness and survival.

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“…21 The literature for DDT is largely from the 1960s−1970s 22 and is thus considerably dated and from an era when ongoing discharges resulted in higher environmental exposures. 23,24 A representative example is a feeding study by Buhler et al (1969), 19 wherein the lowest dietary exposure of 6.25 μg of p,p'-DDT/g feed was nearly 300-fold above the mean concentration measured in the stomach contents of Portland Harbor juvenile Chinook (0.021 μg sum of 6 DDT metabolites/g ww stomach contents). 9 These examples highlight the need to address data gaps related to the effects of exposures from comparatively lower concentrations of contaminant mixtures that are representative of modern habitat conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Similarly, a reported adverse growth effect with dietary exposure to PAHs was previously observed on much larger Chinook salmon than the field-collected juveniles (∼13 vs ∼1 g, respectively); as such, the laboratory study’s PAH effect level may not reflect the dose–response of smaller (∼1 g) out-migrating juvenile Chinook salmon . The literature for DDT is largely from the 1960s–1970s and is thus considerably dated and from an era when ongoing discharges resulted in higher environmental exposures. , A representative example is a feeding study by Buhler et al (1969), wherein the lowest dietary exposure of 6.25 μg of p,p’ -DDT/g feed was nearly 300-fold above the mean concentration measured in the stomach contents of Portland Harbor juvenile Chinook (0.021 μg sum of 6 DDT metabolites/g ww stomach contents) . These examples highlight the need to address data gaps related to the effects of exposures from comparatively lower concentrations of contaminant mixtures that are representative of modern habitat conditions.…”

Section: Introductionmentioning

confidence: 99%

Dietary Exposure to Environmentally Relevant Levels of Chemical Contaminants Reduces Growth and Survival in Juvenile Chinook Salmon

Lundin,

Chittaro,

Schultz

et al. 2023

Environ. Sci. Technol.

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Chemical pollution can degrade aquatic ecosystems. Chinook salmon in contaminated habitats are vulnerable to health impacts from toxic exposures. Few studies have been conducted on adverse health outcomes associated with current levels and mixtures of contaminants. Fewer still address effects specific to the juvenile life-stage of salmonids. The present study evaluated contaminant-related effects from dietary exposure to environmentally relevant concentrations and mixture profiles in juvenile Chinook salmon from industrialized waterways in the U.S. Pacific Northwest using two end points: growth assessment and disease susceptibility. The dose and chemical proportions were reconstituted based on environmental sampling and analysis using the stomach contents of juvenile Chinook salmon recently collected from contaminated, industrialized waterways. Groups of fish were fed a mixture with fixed proportions of 10 polychlorinated biphenyls (PCBs), 3 dichlorodiphenyltrichloroethanes (DDTs), and 13 polycyclic aromatic hydrocarbons (PAHs) at five concentrations for 35 days. These contaminant compounds were selected because of elevated concentrations and the widespread presence in sediments throughout industrialized waterways. Fork length and otolith microstructural growth indicators were significantly reduced in fish fed environmentally relevant concentrations of these contaminants. In addition, contaminant-exposed Chinook salmon were more susceptible to disease during controlled challenges with the pathogen Aeromonas salmonicida. Our results indicate that dietary exposure to contaminants impairs growth and immune function in juvenile Chinook salmon, thereby highlighting that current environmental exposure to chemicals of potential management concern threatens the viability of exposed salmon.

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Examination of temporal DDT trends in Lake Erie fish communities using dynamic linear modeling

Cited by 11 publications

References 69 publications

Nutrient management and structural shifts in fish assemblages: Lessons learned from an Area of Concern in Lake Ontario

Nutrient management and structural shifts in fish assemblages: Lessons learned from an Area of Concern in Lake Ontario

Persistent Organic Pollutant Burden, Experimental POP Exposure, and Tissue Properties Affect Metabolic Profiles of Blubber from Gray Seal Pups

Dietary Exposure to Environmentally Relevant Levels of Chemical Contaminants Reduces Growth and Survival in Juvenile Chinook Salmon

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