Fish community structure in the Bay of Quinte, Lake Ontario:

Hoyle, J. A.; Bowlby, J. N.; Brousseau, C. M.; Johnson, T. B.; Morrison, B. J.; Randall, R. G.

doi:10.14321/j.ctv34xx5zz.19

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“…In 2018, the highest observed densities of larval cisco were observed in the northwest region of Chaumont Bay, corresponding to consistent southwesterly winds throughout the sampling period (Figures 1 and A1). Hoyle (1992) similarly found schools of lake whitefish concentrated within eddies of the Bay of Quinte. In North Bay and Moonlight Bay of Lake Michigan, shoreward winds are important for transporting lake whitefish larvae from spawning reefs at the mouth of bays into protected inshore habitats (Frederick, 1982).…”

Section: Discussionmentioning

confidence: 98%

“…In Chaumont Bay, McKenna and Johnson (2009) reported larval lake whitefish mean growth rates of 0.36 mm/day, with slower growth in April (0.12 mm/day) than in May (0.39 mm/day). During the month of May in the Bay of Quinte, Hoyle (1992) found larval lake whitefish growth rates of approximately 0.38 mm/day and Pritchard (1931) describe cisco growth rates of approximately 0.47 mm/day. At times, we observed declining or negative growth rates which we inferred to be due to the emergence of newly‐hatched larvae and avoidance of the net by larger larvae (Barkley, 1972).…”

Section: Discussionmentioning

confidence: 99%

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Larval cisco and lake whitefish exhibit high distributional overlap within nursery areas

Brown,

Rudstam,

Holden

et al. 2023

Ecology of Freshwater Fish

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Coregonine fishes, including lake whitefish (Coregonus clupeaformis) and cisco (C. artedi), are socioecologically important in the Laurentian Great Lakes and of conservation concern, but the processes driving recruitment variability are unclear. In Lake Ontario, cisco and lake whitefish exhibit similar spawning behaviours and early life histories, but population trajectories are diverging. One hypothesis is that sympatric cisco and lake whitefish larvae occupy distinct habitats and experience dissimilar local environmental conditions, despite co‐occurrence within nursery areas. We described the spatiotemporal distributions of larval cisco and lake whitefish among multiple Lake Ontario embayment nursery areas, characterised physical habitat features associated with their distributions, determined the degree of spatial habitat partitioning between species and evaluated how habitat niche divergence occurred along an ontogenetic progression. Both species were widely distributed across larval nursery areas, though lake whitefish were less abundant and more narrowly distributed than cisco. Within the yolk sac stage, lake whitefish occupied more nearshore, shallower and colder waters than cisco, indicating potential habitat niche partitioning between congeners. However, distributional differences were subtle and likely driven by differential hatch timing and staggered ontogenetic habitat shifts. Combined, our results illustrate similar habitat use between cisco and lake whitefish through the larval stage and demonstrate that ontogeny and species‐specific phenology influence habitat use for these species. This study provides additional evidence that the early life histories of cisco and lake whitefish are highly similar and does not support the hypothesis that larval habitat use differences are a major driver of differential recruitment success for these species.

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Section: Discussionmentioning

confidence: 98%