Effect of light intensity and substrate type on siscowet lake trout (Salvelinus namaycush siscowet) predation on deepwater sculpin (Myoxocephalus thompsonii)

Keyler, Trevor; Hrabik, Thomas R.; Mensinger, Allen F.; Rogers, Loranzie S.; Gorman, Owen T.

doi:10.1007/s10750-019-3944-5

Cited by 14 publications

(15 citation statements)

References 55 publications

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“…However, at the midmorning light intensity, Smallmouth Bass reduced swimming activity, peak reaction distance decreased, and less reactions occurred. Smallmouth Bass reaction distances increased nonlinearly with increasing light intensity, as previously observed for visual predators, including Lake Trout (Vogel and Beauchamp 1999;Keyler et al 2015Keyler et al , 2019, Yellow Perch (Richmond et al 2004), Bluegill Lepomis macrochirus (Vinyard and O'Brien 1976), and White Crappie Pomoxis annularis (O'Brien et al 1986).…”

Section: Effect Of Light On Predation Successsupporting

confidence: 77%

“…Previous studies have defined reaction of predators to prey as an orientation toward prey, which allowed for a dichotomous answer: reaction or no reaction (O'Brien 1979;Richmond et al 2004;Keyler et al 2015Keyler et al , 2019. Due to the difficulty of not knowing when predators swam by immobile prey and did not orient, we only calculated reactions to moving prey.…”

Section: Limitations Of Estimating Reaction Distancementioning

confidence: 99%

“…Foraging success.-Foraging success was calculated as the probability of the predator locating, attacking, capturing, and retaining prey (O'Brien 1979;Richmond et al 2004;Keyler et al 2015Keyler et al , 2019. Location, hereafter reaction, was defined as the predator orienting to a single moving prey (O'Brien 1979).…”

mentioning

confidence: 99%

“…These factors include the sensory abilities of the predator and prey (Liem 1978; Lundvall et al 1999; Beauchamp et al 1999) and the effects of environmental variables on these sensory systems (Utne‐Palm 2002; Lönnstedt et al 2013; Santos‐Pata et al 2018). Previous studies on predator–prey interactions have focused primarily on interspecific interactions of a single visually mediated predator and one prey species (O’Brien 1979; Nielsen 1980; Vogel and Beauchamp 1999; Mazur and Beauchamp 2003; Hansen et al 2013; Jönsson et al 2013; Keyler et al 2015, 2019). However, predators often attack a variety of prey species and face both inter‐ and intraspecific competition for prey resources.…”

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confidence: 99%

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Comparison of Multipiscivore Foraging Success on Native and Invasive Prey Fish under Variable Light Intensities

2021

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Piscivorous fishes attack and consume a variety of prey; however, few studies have examined interactions of multiple predators with multiple prey species. The situational complexity of foraging at different times of day was explored by examining the interactions of paired native predators (Burbot Lota lota or Smallmouth Bass Micropterus dolomieu) with either native (Mottled Sculpin Cottus bairdii) or invasive (Round Goby Neogobius melanostomus) benthic prey. The study allowed the comparison of a pursuit predator (Smallmouth Bass) and an ambush predator (Burbot). Trials were performed under natural relevant lighting conditions with downwelling light intensity and emission spectrum matched to the irradiance at a 10-m depth in the St. Louis River estuary during the summer at night, civil twilight, sunrise, and midmorning. Smallmouth Bass were more active and initiated 1,510 reactions that resulted in the successful capture of 61 Round Goby and 103 Mottled Sculpin, whereas Burbot initiated 475 reactions resulting in 24 successful retentions, including 9 Round Goby and 15 Mottled Sculpin. The percentage of successful retentions was greater for Smallmouth Bass (10.9%) than for Burbot (5%). Reaction probabilities to each prey differed significantly, which resulted in a two-fold increase in attacks on Mottled Sculpin compared with Round Goby within the same time period. Reaction distances for both predators did not differ regarding prey species, but Smallmouth Bass reacted from farther away than did Burbot (maximum reaction distances of 159 and 98 cm, respectively). Greater success of native predators on native prey has likely caused higher mortality on native prey populations due to greater predator success, while capturing invasive prey decreases the net energy intake.

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Section: Effect Of Light On Predation Successsupporting

confidence: 77%

Section: Limitations Of Estimating Reaction Distancementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Comparison of Multipiscivore Foraging Success on Native and Invasive Prey Fish under Variable Light Intensities

2021

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“…Four articles were included here in the proceedings. First, Keylor et al (2019a) found that siscowet lake charr could visually forage on deepwater sculpin (Myoxocephalus thompsonii, Girard 1851) at any depth in Lake Superior based on available light levels. The reaction distance to sculpin may not decline until depths exceed 200 m in Lake Superior, but reaction distances were not affected by substrate type under any light intensity.…”

Section: Behavior Movement and Habitatmentioning

confidence: 99%

Assessing the impact of charr research past, present, and future

et al. 2019

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The 9th International Charr Symposium convened on 18-21 June 2018, in Duluth, Minnesota, USA, to gather scientists with an interest in charr biology and management from the entire geographical range of the genus Salvelinus. The symposium was attended by 169 individuals from six countries, and included 99 oral and 32 poster presentations, 28 of which were published in the ensuing proceedings. Topic areas of presentations and publications included (1) cultural anthropology; (2) genetics, evolution, taxonomy, and systematics; (3) behavior, movement, and habitat; (4) reproductive ecology, developmental ontogeny, and physiology; (5) population ecology, dynamics, and life history; (6) trophic ecology, parasites, predators, toxicology, and pollution; and (7) management. Research reported in these proceedings has built upon the history of earlier symposiums and will be continued with the 10th symposium scheduled to convene in Nikko City, Tochigi Prefecture, Japan, in 2021.

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Siscowet lake charr (Salvelinus namaycush siscowet) visual foraging habitat in relation to daily and seasonal light cycles

2019

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Effect of light intensity and substrate type on siscowet lake trout (Salvelinus namaycush siscowet) predation on deepwater sculpin (Myoxocephalus thompsonii)

Cited by 14 publications

References 55 publications

Comparison of Multipiscivore Foraging Success on Native and Invasive Prey Fish under Variable Light Intensities

Comparison of Multipiscivore Foraging Success on Native and Invasive Prey Fish under Variable Light Intensities

Assessing the impact of charr research past, present, and future

Siscowet lake charr (Salvelinus namaycush siscowet) visual foraging habitat in relation to daily and seasonal light cycles

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