Thermal niche and habitat use by co-occurring lake trout (Salvelinus namaycush) and brook trout (S. fontinalis) in stratified lakes

Ridgway, Mark S.; Bell, Allan H.; Lacombe, Nick A.; Mitchell, Krystal J.; Smith, D.; Taylor, Cynthia; Middel, Trevor A.

doi:10.1007/s10641-022-01368-9

Cited by 7 publications

(4 citation statements)

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“…During warm months (i.e., June -September), stratification of lake water resulted in a thermocline of 4.5-7.5 m in depth throughout the lake. The channel between north and west basin has a mean depth of 2-5 m and presumably during summer, the temperature in the channel exceeds thermal preferences of Lake Trout (Figure 5.3; i.e., ≤ 10°C; Dillon et al 2003;Ridgway et al 2022). Fish movement from north to west basin during summer stratification seems improbable and was confirmed by my thesis.…”

Section: Discussionsupporting

confidence: 67%

“…In freshwater ecosystems with complex geomorphology (e.g., multibasin lakes; Figure 5.2), thermal habitats can be discontinuous during parts of the year (e.g., summer; Figure 5.3) that might affect the ability of Lake Trout (and other fishes) to behaviourally thermoregulate Kraemer et al 2021;Ridgway et al 2022). In southern populations, thermal preferences typically result in the seasonal use of deep hypolimnetic zones with sufficient dissolved oxygen (Dillon et al 2003) or metalimnetic and shallow hypolimnetic zones (Christie and Regier 1988).…”

Section: Discussionmentioning

confidence: 99%

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Investigations of Lake Trout Salvelinus namaycush Ecology and Behaviour in Relation to Fragmented Thermal Habitats to Inform a Multifaceted Management Strategy

Hlina

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Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 99%

Investigations of Lake Trout Salvelinus namaycush Ecology and Behaviour in Relation to Fragmented Thermal Habitats to Inform a Multifaceted Management Strategy

Hlina

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“…In addition to these intra‐specific patterns, is also important to consider inter‐specific depth and thermal niche separation, within groups of fishes such as salmonids (e.g., Andrusak & Northcote, 1971; Ridgway et al, 2023). Such variation is revealed in the behaviour of four salmonid species in Lake Washington.…”

Section: Discussionmentioning

confidence: 99%

Seasonal shifts in diel vertical migrations by lake‐dwelling coastal cutthroat trout, Oncorhynchus clarkii clarkii, reflect thermal regimes and prey distributions

Thomas

Beauchamp

Clark

et al. 2023

Ecology of Freshwater Fish

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Lakes provide important habitat for salmonids that may use them as a primary feeding area between periods of reproduction. The seasonal changes in vertical thermal structure in lakes can affect the distribution of salmonids on seasonal and diel time scales as they search for, consume, and digest prey that also exploits the water column's distribution of food, temperature and light. Our goal was to analyse the vertical distribution of wild, native coastal cutthroat trout (Oncorhynchus clarkii clarkii) in Lake Washington on daily and seasonal time scales. This lake is stratified in the summer and isothermal in winter, allowing us to compare vertical movements between periods with and without thermal structure in water 50 m deep. We predicted that trout would be deeper in the water column during stratified months and shallower during isothermal months, and shallower at night than in the day. Overall, the trout showed these patterns in the depths and temperatures they occupied, tending to be within or below the thermocline in the summer but not in the coolest water available, and closer to the surface when the lake was isothermal. The trout were also closer to the surface at night and deeper during the day. The vertical range of these diel movements shifted with the seasons–deepest in October, as the thermocline deepened and weakened, and shallowest in January when the lake was isothermal. These seasonal and diel vertical distribution patterns by the trout optimise metabolism for growth, and facilitate feeding on planktivorous fishes that also show seasonal and diel vertical distribution changes.

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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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Thermal niche and habitat use by co-occurring lake trout (Salvelinus namaycush) and brook trout (S. fontinalis) in stratified lakes

Cited by 7 publications

References 50 publications

Investigations of Lake Trout Salvelinus namaycush Ecology and Behaviour in Relation to Fragmented Thermal Habitats to Inform a Multifaceted Management Strategy

Investigations of Lake Trout Salvelinus namaycush Ecology and Behaviour in Relation to Fragmented Thermal Habitats to Inform a Multifaceted Management Strategy

Seasonal shifts in diel vertical migrations by lake‐dwelling coastal cutthroat trout, Oncorhynchus clarkii clarkii, reflect thermal regimes and prey distributions

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

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