Diel Habitat Partitioning by Bull Charr and Cutthroat Trout During Fall and Winter in Rocky Mountain Streams

Jakober, Michael J.; McMahon, Thomas E.; Thurow, Russell F.

doi:10.1023/a:1007699610247

Cited by 59 publications

(4 citation statements)

References 37 publications

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“…Sea trout were consistently more active during the day than at night in both habitats. Other studies have mostly found nocturnal or crepuscular peaks in activity of sea trout [ 13 , 15 , 18 , 55 , 93 ]; Barry et al 2020), which is consistent with the diel activity of other salmonids (e.g., [ 29 , 33 , 35 ]). Fish are thought to be least active during the day to minimise the risk of predation by otters, birds, or piscivorous fish species.…”

Section: Discussionsupporting

confidence: 64%

Behaviour of anadromous brown trout (Salmo trutta) in a hydropower regulated freshwater system

Dahlmo,

Velle,

Nilsen

et al. 2023

Mov Ecol

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Many Norwegian rivers and lakes are regulated for hydropower, which affects freshwater ecosystems and anadromous fish species, such as sea trout (Salmo trutta). Lakes are an important feature of many anadromous river systems. However, there is limited knowledge on the importance of lakes as habitat for sea trout and how hydropower affects the behaviour of sea trout in lakes. To investigate this, we conducted an acoustic telemetry study. A total of 31 adult sea trout (532 ± 93 mm total length) were captured by angling in river Aurlandselva, Norway, and tagged between July 20 and August 12, 2021. The tags were instrumented with accelerometer, temperature, and depth sensors, which provided information on the sea trout’s presence and behaviour in lake Vassbygdevatnet. Our results indicate that there was a large prevalence of sea trout in the lake during the spawning migration, and that the sea trout were less active in the lake compared to the riverine habitats. An increase in activity of sea trout in the lake during autumn might indicate that sea trout spawn in the lake. However, the discharge from the high-head storage plant into the lake did not affect the depth use or activity of sea trout in the lake. Furthermore, the large prevalence of spawners in the lake during autumn will likely cause an underestimation of the size of the sea trout population in rivers with lakes during annual stock assessment. In conclusion, our results could not find evidence of a large impact of the discharge on the behaviour of sea trout in the lake.

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Section: Discussionsupporting

confidence: 64%

Behaviour of anadromous brown trout (Salmo trutta) in a hydropower regulated freshwater system

Dahlmo,

Velle,

Nilsen

et al. 2023

Mov Ecol

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“…Adult splittail were relatively sedentary in our study wetland, suggesting that post-spawning "resting" habitat may be important for the species. Similarly, our snorkel surveys showed that early stages (mean 21 mm FL) of young splittail produced in the wetland were strongly associated with shallow areas, a common response of freshwater fish (Glova and Jellyman 2000;Jakober et al 2000). Hence, inundation of floodplain provides access to large areas of shallow, vegetated habitat for postspawning recovery of adults, and rearing of juveniles.…”

Section: Relevance To the Biology Of Splittail And Other Cyprinidssupporting

confidence: 59%

Habitat Associations and Behavior of Adult and Juvenile Splittail (Cyprinidae: Pogonichthys macrolepidotus) in a Managed Seasonal Floodplain Wetland

Sommer¹,

Harrell²,

Matica³

et al. 2008

SFEWS

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Although there is substantial information about the benefits of managed seasonal wetlands to wildlife, little is known about whether this habitat can help support "at risk" native fishes. The Sacramento splittail Pogonichthys macrolepidotus, a California Species of Special Concern, does not produce strong year classes unless it has access to floodplain wetlands of the San Francisco Estuary and its tributaries. Our study examined the potential use of managed inundation to support spawning and rearing of splittail in years when the availability of seasonal habitat is limited. Wild adult splittail were captured during their spawning migration and transferred to a 3.8-ha engineered wetland, where they successfully spawned shortly after introduction. Radio telemetry studies suggested that post-spawning adults were relatively sedentary over the study period. Adult splittail were primarily located in habitats with open water or light vegetation, and in the deepest portions of the wetland. Snorkel surveys showed that early stages (mean 21-mm fork length [FL]) of young splittail produced in the wetland were strongly associated with shallow areas with shoreline emergent terrestrial vegetation and submerged aquatic vegetation, but moved offshore to deeper areas with tules and submerged terrestrial vegetation at night. Larger juveniles (mean 41-mm FL) primarily used deeper, offshore habitats during day and night. At night, schools of both younger and older juveniles dispersed, and individuals were associated with the bottom of water column. These observations have important implications for the construction of managed and restored wetlands for the benefit of native fishes.

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“…Conversely, the tail-out of the plunge pool below the impoundment (antenna one; Fig. 1) was generally avoided during the day, but became the most selected for antenna at night, as many salmonids will make nocturnal moves to shallower areas away from cover (Jakober et al 2000;Albrecht and Gotelli 2001;Reeves et al 2009;Hines et al 2017). Diel shifts in habitat use can occur due to crepuscular foraging (Bradford and Higgins 2001); predator avoidance (Metcalfe et al 1999); minimizing respiration at high water temperatures (Sloat et al 2013); and reducing swimming cost at night (Reeves et al 2009).…”

Section: Discussionmentioning

confidence: 99%

Beaver activity increases habitat complexity and spatial partitioning by steelhead trout

Wathen

Allgeier

Bouwes

et al. 2019

Can. J. Fish. Aquat. Sci.

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Freshwater habitat restoration is a major conservation objective, motivating efforts to restore habitat complexity and quality for fishes. Restoration based on the engineering activities of beavers (Castor canadensis) increases fish habitat complexity, but how this affects fish habitat use and movement behaviours is not well known. We used a network of passive integrated transponder antennas to quantify small-scale movement and microhabitat use of 175 individual juvenile steelhead (Oncorhynchus mykiss) in a stream channel with a complex bathymetric profile resulting from a beaver impoundment and in a simplified channel devoid of beaver activity. Our results show that juvenile steelhead exploit microhabitat heterogeneity by employing a range of behaviours that maximizes available habitat via spatial and temporal partitioning among individuals. These results suggest spatial resource partitioning as a potential mechanism for the previously established positive correlations among steelhead density, survival, and production with beaver-based restoration within the study watershed. More broadly, our findings provide insight as to how populations can exploit habitat complexity through spatial partitioning that can be informative for planning restoration and management actions.

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Diel Habitat Partitioning by Bull Charr and Cutthroat Trout During Fall and Winter in Rocky Mountain Streams

Cited by 59 publications

References 37 publications

Behaviour of anadromous brown trout (Salmo trutta) in a hydropower regulated freshwater system

Behaviour of anadromous brown trout (Salmo trutta) in a hydropower regulated freshwater system

Habitat Associations and Behavior of Adult and Juvenile Splittail (Cyprinidae: Pogonichthys macrolepidotus) in a Managed Seasonal Floodplain Wetland

Beaver activity increases habitat complexity and spatial partitioning by steelhead trout

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