Limitations to Lake Trout ( Salvelinus namaycush ) Rehabilitation in the Great Lakes Imposed by Biotic Interactions Occurring at Early Life Stages

Jones, Michael L.; Eck, Gary W.; Evans, Douglas E.; Fabrizio, Mary C.; Hoff, Michael H.; Hudson, Patrick L.; Janssen, John; Jude, David J.; O’Gorman, Robert; Savino, Jacqueline F.

doi:10.1016/s0380-1330(95)71122-4

Cited by 48 publications

(20 citation statements)

References 52 publications

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“…We collected five species (rock bass, smallmouth bass, lake whitefish, white perch and rainbow trout) that have not previously been documented as predators of lake trout fry (reviewed by Jones et al, 1995). White perch is exotic to Lake Champlain, as is the stocked rainbow trout.…”

Section: Discussionmentioning

confidence: 99%

“…Between 2001 and 2003, the egg and fry relative abundances at several sites in Lake Champlain were much higher than densities in Parry Sound, Lake Huron, where there is substantial recruitment and a local lake trout population has been restored (Reid et al, 2001. Egg densities recorded in Lake Champlain are well above the suggested threshold egg density of 500 eggs m − 2 presumed to be necessary to withstand predation rates observed in the Great Lakes (Jones et al, 1995). Furthermore, the density of interstitial egg predators in Lake Champlain is less than in Lake Huron and the ratio of eggs to predators was six times that of Parry Sound .…”

Section: Introductionmentioning

confidence: 86%

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Predation on emergent lake trout fry in Lake Champlain

Riley

Marsden

2009

Journal of Great Lakes Research

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 86%

Predation on emergent lake trout fry in Lake Champlain

Riley

Marsden

2009

Journal of Great Lakes Research

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“…Nutrient levels (Nichols and Hopkins 1993) and excessive periphyton growth, which might cause low oxygen levels in interstitial spaces on spawning reefs during egg incubation (Sly 1988) had declined and were now less likely to impact lake trout recruitment. Alewives, however, were suspected to impede resurgence of lake trout because of their ability to exert heavy predation pressure on lake trout fry (Jones et al 1995;Krueger et al 1995) and because of their ability to induce mortality of fry through thiamine deficiency brought about by a maternal lake trout diet of alewife (also known as early mortality syndrome (EMS); Fitzsimons et al 1999). Although thiamine levels and the resulting EMS were not sufficient to completely block recruitment, the sublethal effects resulting from the thiamine deficiency pose a significant bottleneck to recruitment.…”

Section: Lake Troutmentioning

confidence: 99%

Lake Ontario: food web dynamics in a changing ecosystem (19702000)

Mills¹,

Casselman²,

Dermott³

et al. 2003

Can. J. Fish. Aquat. Sci.

302

216

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We examined stressors that have led to profound ecological changes in the Lake Ontario ecosystem and its fish community since 1970. The most notable changes have been reductions in phosphorus loading, invasion by Dreissena spp., fisheries management through stocking of exotic salmonids and control of sea lamprey (Petromyzon marinus), and fish harvest by anglers and double-crested cormorants (Phalacrocorax auritus). The response to these stressors has led to (i) declines in both algal photosynthesis and epilimnetic zooplankton production, (ii) decreases in alewife (Alosa pseudoharengus) abundance, (iii) declines in native Diporeia and lake whitefish (Coregonus clupeaformis), (iv) behavioral shifts in alewife spatial distribution benefitting native lake trout (Salvelinus namaycush), threespine stickleback (Gasterosteus aculeatus), and emerald shiner (Notropis atherinoides) populations, (v) dramatic increases in water clarity, (vi) predation impacts by cormorants on select fish species, and (vii) lake trout recruitment bottlenecks associated with alewife-induced thiamine deficiency. We expect stressor responses associated with anthropogenic forces like exotic species invasions and global climate warming to continue to impact the Lake Ontario ecosystem in the future and recommend continuous long-term ecological studies to enhance scientific understanding and management of this important resource. 490Résumé : On trouvera ici un examen des facteurs de stress qui ont modifié profondément l'écosystème du lac Ontario et sa communauté de poissons depuis 1970. Les changements les plus importants ont été la réduction de l'apport de phosphore, l'invasion des Dreissena spp., la gestion de la pêche, notamment l'empoissonnement de salmonidés exotiques et le contrôle de la grande lamproie marine (Petromyzon marinus), ainsi que la récolte des poissons par les pêcheurs sportifs et les cormorans à aigrette (Phalacrocorax auritus). La réaction à ces facteurs a eu pour conséquen-ces: (i) le déclin de la photosynthèse des algues et de la production du zooplancton épilimnétique, (ii) la diminution de l'abondance du gaspareau (Alosa pseudoharengus), (iii) la réduction des Diporeia indigènes et des grands corégonesCan.

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“…For example, Jones et al (1995) modelled the proportion of lake trout eggs (and fry) consumed under different scenarios of predation and reported values ranging 0.47-1.00. Empirical studies that have tracked the fate of incubating fish eggs have found that as many as 79-99% of eggs will succumb to some source of mortality before hatching (Johnson 1961;Rupp 1965;Fitzsimons 1995;, and threats beyond predation can be prevalent.…”

Section: Discussionmentioning

confidence: 99%

Population‐level effects of egg predation on a native planktivore in a large freshwater lake

Bunnell

Mychek-Londer

Madenjian

2013

Ecology of Freshwater Fish

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Using a 37-year recruitment time series, we uncovered a field pattern revealing a strong, inverse relationship between bloater Coregonus hoyi recruitment success and slimy sculpin Cottus cognatus biomass in Lake Michigan (United States), one of the largest freshwater lakes of the world. Given that slimy sculpins (and deepwater sculpin Myoxocephalus thompsonii) are known egg predators that spatiotemporally overlap with incubating bloater eggs, we used recently published data on sculpin diets and daily ration to model annual bloater egg consumption by sculpins for the 1973-2010 year-classes. Although several strong year-classes were produced in the late 1980s when the proportion of eggs consumed by slimy sculpins was extremely low (i.e., <0.001) and several weak year-classes were produced when the proportion of bloater eggs consumed was at its highest (i.e., >0.10-1.0), egg predation failed to explain why recruitment was weak for the [1995][1996][1997][1998][1999][2000][2001][2002][2003][2004][2005] year-classes when the proportion consumed was also low (i.e., <0.02). We concluded that egg predation by slimy and deepwater sculpins could have limited bloater recruitment in some years, but that some undetermined factor was more important in many other years. Given that slimy sculpin densities are influenced by piscivorous lake trout Salvelinus namaycush, the restoration of which in Lake Michigan has lagged behind those in lakes Superior and Huron, our study highlights the importance of an ecosystem perspective when considering population dynamics of fishes.

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Limitations to Lake Trout ( Salvelinus namaycush ) Rehabilitation in the Great Lakes Imposed by Biotic Interactions Occurring at Early Life Stages

Cited by 48 publications

References 52 publications

Predation on emergent lake trout fry in Lake Champlain

Predation on emergent lake trout fry in Lake Champlain

Lake Ontario: food web dynamics in a changing ecosystem (19702000)

Population‐level effects of egg predation on a native planktivore in a large freshwater lake

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Limitations to Lake Trout ( Salvelinus namaycush ) Rehabilitation in the Great Lakes Imposed by Biotic Interactions Occurring at Early Life Stages

Cited by 48 publications

References 52 publications

Predation on emergent lake trout fry in Lake Champlain

Predation on emergent lake trout fry in Lake Champlain

Lake Ontario: food web dynamics in a changing ecosystem (19702000)

Population‐level effects of egg predation on a native planktivore in a large freshwater lake

Contact Info

Product

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Lake Ontario: food web dynamics in a changing ecosystem (19702000)