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

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Foraging characteristics of siscowet lake trout (Salvelinus namaycush siscowet) on deepwater sculpin (Myoxocephalus thompsonii) were studied under ecologically relevant downwelling light intensities (9.0 × 108 to 1.62 × 1011 photons m−2 s−1) and emission spectrum (500–510 nm) on varying substrates (gravel, sand, and black fabric). Siscowet reaction distance within our trials increased with light intensity up to 6.0 × 109 photons m−2 s−1, after which reaction distance remained constant with additional increases in light intensity following the Michaelis–Menten saturation function. Reaction distances were not affected by substrate type under any light intensity. The number of prey captures also increased with increasing light intensity, with most orientations toward prey occurring within the siscowet’s forward sector (± 0°–60°, where 0° represents the tip of the siscowet rostrum). Finally, the overall probability of prey capture was positively related to reaction distance at each light intensity. Results suggest that siscowet can visually forage on benthic prey at great depth in Lake Superior, and reaction distance (≤ 27 cm) to sculpin may not diminish until depths exceed 200 m (6.00 × 109 photons m−2 s−1).

Original languageEnglish (US)
Pages (from-to)77-88
Number of pages12
JournalHydrobiologia
Volume840
Issue number1
DOIs
StatePublished - Sep 1 2019

Fingerprint

Salvelinus namaycush
light intensity
predation
substrate
lake
prey capture
Lake Superior
Cottidae
downwelling
sand and gravel
gravel
forage
effect
Myoxocephalus thompsonii
foraging
saturation
sand

Keywords

  • Crypsis
  • Lake Superior
  • Pelagic
  • Reaction distance
  • Vision

Cite this

Effect of light intensity and substrate type on siscowet lake trout (Salvelinus namaycush siscowet) predation on deepwater sculpin (Myoxocephalus thompsonii). / Keyler, Trevor D.; Hrabik, Thomas R; Mensinger, Allen; Rogers, Loranzie S.; Gorman, Owen T.

In: Hydrobiologia, Vol. 840, No. 1, 01.09.2019, p. 77-88.

Research output: Contribution to journalArticle

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