Comparative trophic ecology of nearshore juvenile salmonids in Lake Ontario

Nawrocki, Brent; Zhu, Changhai; Johnson, Timothy B.

doi:10.1016/j.jglr.2022.09.004

Cited by 4 publications

(4 citation statements)

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“…Several salmonid species are present in Lake Ontario and its nearshore areas including coho, chinook, and Atlantic salmon, and rainbow, lake, and brown trout; salmon and brown trout congregate near river mouths and migrate up streams to spawn in the fall, while rainbow trout tend to gather and migrate into streams in the spring for spawning . Brook and brown trout have been widespread in cold-water streams across the region, and all but lake trout spend time in tributaries and nearshore waters as juveniles, including in the GTA region . Organisms including fish within GTA watersheds are stressed, impacted by urban stream syndrome, with their diversity and richness negatively correlated with road density .…”

Section: Resultsmentioning

confidence: 99%

“…70 Brook and brown trout have been widespread in cold-water streams across the region, 71 and all but lake trout spend time in tributaries and nearshore waters as juveniles, including in the GTA region. 72 Organisms including fish within GTA watersheds are stressed, impacted by urban stream syndrome, with their diversity and richness negatively correlated with road density. 73 Based on our findings, trout and salmon are exposed to 6PPD-Q at different life stages in lakes and streams in the region, which may contribute to the risks faced by these organisms in urban-influenced waters.…”

Section: T H Imentioning

confidence: 99%

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Assessment of Tire-Additive Transformation Product 6PPD-Quinone in Urban-Impacted Watersheds

Helm,

Raby,

Kleywegt

et al. 2024

ACS EST Water

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Urban stormwater is a conduit for pollutants such as nutrients and tire-wear compounds through streams to the Great Lakes receiving waters. The transformation product of tire antiozonant 6PPD, 6PPD-quinone (6PPD-Q), is implicated in causing fish mortality. Urban streams entering Lake Ontario and waters adjacent to urban centers in Toronto and Hamilton, Ontario, were assessed for 6PPD-Q and its potential to impact aquatic life. Sampling occurred during fall and spring dry-and wet-weather flows in 2021−2022, overlapping with fish spawning times. Concentrations of 6PPD-Q were elevated during wet-weather (maximum 82 ng/ L) in streams with the greatest degree of urbanization and road density but were much lower (2.4−4.5 ng/L) in nearshore waters, suggesting rapid dilution. Precipitation, road density within watersheds, chloride (from road salts), and total phosphorus were correlated with 6PPD-Q concentrations, suggesting that such parameters may provide a means to identify and prioritize key stream habitats for further assessment. A screening level hazard assessment using application factors of 10−1000 and available toxicity end points for fish (rainbow trout, brook trout, coho salmon) showed that 6PPD-Q concentrations may pose a risk in urban streams and nearshore waters of the region. We recommend that stormwater quality control measures be assessed for their effectiveness in reducing 6PPD-Q concentrations.

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Section: Resultsmentioning

confidence: 99%

Section: T H Imentioning

confidence: 99%

Assessment of Tire-Additive Transformation Product 6PPD-Quinone in Urban-Impacted Watersheds

Helm,

Raby,

Kleywegt

et al. 2024

ACS EST Water

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“…Thus, body size can determine the vulnerability of individuals, populations and communities (Rice & Gislason, 1996). The high body size condition, usually acquired with a higher consumption of food, determines the level of aggression and territoriality of organisms with a lower body size condition is more difficult to start fights and have higher rates of mortality and it is the main factor affecting survival (Donelson et al, 2009;Poulos & McCormick, 2015;Nawrocki et al,2022). Larger individuals tend to be more territorial and competitive reflecting fewer specimens, but with a high body condition, as found in this study.…”

Section: Temporal Dynamics Of Size Spectrum Of a Fish Population In N...mentioning

confidence: 99%

Temporal dynamics of size spectrum of a fish population in neotropical reservoirs

Sereia

Bueno

Almeida

et al. 2022

Int J Innov Educ Res

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Studies on the size spectrum allow indirect inferences of how the energy flows from one organism to another. Assuming that the bottom-up is more intense than the top-down mechanism along the cascade of reservoirs, which limits the growth and development of individuals, we investigated the effect of a cascade of reservoirs in a neotropical basin on the stock and distribution of the population of Oligosarcus longirostris, a species at the top of the food chain. Samples were conducted quarterly in five reservoirs, from March 2004 to December 2008. Stock size was estimated by catch per unit effort (CPUE); to establish the size spectra slopes of fish, we used Pareto I model, and data was analyzed using univariate analysis of variance followed by Tukey's test. There was a higher proportion of smaller individuals in the first reservoir of the cascade, with a decline in this proportion along the succession of reservoirs in the cascade. It can be concluded that there is an effect of the reservoir cascade on the abundance and size of individuals of Oligosarcus longirostris.

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“…Lake trout share similar trophic ecologies and habitat use with other salmonids that inhabit deep and cold oligotrophic lakes (Ivanova et al 2021;Nawrocki et al 2022;Ridgway et al 2022). These salmonids are adapted for rapid vertical movement, displaying diel vertical migration and air gulping from the surface to fill their swim bladders (Saunders 1953;Keyler et al 2019;Macaulay et al 2020;Pelster 2021;Larocque et al 2022).…”

Section: Introductionmentioning

confidence: 99%

hysiological and Behavioural Responses of Lake Trout to Catch-And-Release Angling

Howell

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Lake trout (Salvelinus namaycush), like many other native fishes in North America are a popular species typically targeted for recreational angling. Catch-and-release angling (C&R) relies on the assumption of high fish survival following release and is considered an effective way to preserve wild stocks of fish. Salmonids and other related species are susceptible to recreational angling, which can induce stress during different parts of the process (e.g., line fighting and air exposure). Other factors can impact fish health (e.g., water temperature and hooking location) and potentially lead to delayed mortality. In this thesis, I present empirical research where I used reflex impairment, physiology, and overall activity to assess the robustness of lake trout to C&R across seasons and time scales. During ice angling, lake trout experienced signs of reflex and physiological impairment up to 6 h and a high mortality rate. A key finding was that lake trout may exhibit pressure-related injuries in cooler water temperatures despite being physostomous. During open water angling, lake trout experienced barotrauma, reflex impairment, and physiological impairment immediately upon capture and 0.5 h post-angling. The addition of post-release activity monitoring via tri-axial accelerometry showed that lake trout rapidly swim to depth and exhibit reduced activity for the first 14 min after release. Collectively, I demonstrate that using multiple metrics of assessing angling-related impairment (i.e., both external and internal metrics) is necessary and future studies should not rely on one or few indices. The work presented here provides new information regarding context-specific aspects of C&R and is useful for recreational fisheries management.

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Comparative trophic ecology of nearshore juvenile salmonids in Lake Ontario

Cited by 4 publications

References 64 publications

Assessment of Tire-Additive Transformation Product 6PPD-Quinone in Urban-Impacted Watersheds

Assessment of Tire-Additive Transformation Product 6PPD-Quinone in Urban-Impacted Watersheds

Temporal dynamics of size spectrum of a fish population in neotropical reservoirs

hysiological and Behavioural Responses of Lake Trout to Catch-And-Release Angling

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