Reproduction

Goetz, Frederick W.; Marsden, J. Ellen; Richter, Catherine A.; Tillitt, Donald E.; Sitar, Shawn P.; Riley, Stephen C.; Krueger, Charles C.

doi:10.1007/978-3-030-62259-6_10

Cited by 8 publications

(6 citation statements)

References 164 publications

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“…One explanation is that skipped spawning is not solely a response to environmental conditions, but also a programed response to adaptations siscowets have for living in consistently low water temperatures that leave less energy available to allocate towards reproduction ( Goetz et al 2014 ). Thus, skipped spawning naturally occurs at some baseline rate for siscowet lake trout, and environmental factors that limit energy storage increase the likelihood of skipping ( Goetz et al 2021 ). Another possibility is that under high food availability, skipped spawning may be more common as individuals can opportunistically increase growth and take advantage of the future benefits of increased body size for reproductive output when food availability may be lower ( Jørgensen et al 2006 ; Rideout and Tomkiewicz 2011 ).…”

Section: Discussionmentioning

confidence: 99%

The Influence of Life History on the Response to Parasitism: Differential Response to Non-Lethal Sea Lamprey Parasitism by Two Lake Charr Ecomorphs

Firkus

Goetz

Fischer

et al. 2022

Integrative and Comparative Biology

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The energetic demands of stressors like parasitism require hosts to reallocate energy away from normal physiological processes to survive. Life history theory provides predictions about how hosts will reallocate energy following parasitism, but few studies provide empirical evidence to test these predictions. We examined the sub-lethal effects of sea lamprey parasitism on lean and siscowet lake charr, two ecomorphs with different life history strategies. Leans are shorter lived, faster growing, and reach reproductive maturity earlier than siscowets. Following a parasitism event of four days, we assessed changes to energy allocation by monitoring endpoints related to reproduction, energy storage, and growth. Results indicate that lean and siscowet lake charr differ considerably in their response to parasitism. Severely parasitized leans slightly increased their reproductive effort and maintained growth and energy storage, consistent with expectations based on life history that leans are less likely to survive parasitism and have shorter lifespans than siscowets making investing in immediate reproduction more adaptive. Siscowets nearly ceased reproduction following severe parasitism and showed evidence of altered energy storage, consistent with a strategy that favors maximizing long term reproductive success. These findings suggest that life history can be used to generalize stressor response between populations and can aid management efforts.

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Section: Discussionmentioning

confidence: 99%

The Influence of Life History on the Response to Parasitism: Differential Response to Non-Lethal Sea Lamprey Parasitism by Two Lake Charr Ecomorphs

Firkus

Goetz

Fischer

et al. 2022

Integrative and Comparative Biology

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“…(2021) reported that the difference in relative fecundity between native and nonnative Lake Trout populations was not statistically significant, which suggests there are conditions specific to Yellowstone Lake that are perhaps contributing to higher reproductive potential in the lake; however, identifying those conditions may be difficult (Goetz et al. 2021).…”

Section: Discussionmentioning

confidence: 99%

Invasive Lake Trout Reproduction in Yellowstone Lake under an Active Suppression Program

et al. 2021

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In Yellowstone Lake, predation by invasive Lake Trout Salvelinus namaycush has caused significant abundance declines in native Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri. Lake Trout suppression has been ongoing since 1995; assessment and simulation modeling are used to measure suppression effectiveness and guide efforts. Lake Trout reproduction demographics are linked to these modeling efforts via quantification of the population stock-recruitment relationship. To improve estimation of this relationship for Lake Trout in Yellowstone Lake, we assessed reproduction demographics by quantifying spawning periodicity, size at maturity, and female fecundity. Histological assessment suggested that females with a gonadosomatic index (GSI) >3.0 and males with a GSI >1.0 were capable of spawning. Approximately 65% of mature females appeared to have spawned on an annual cycle. In 2015, the mean absolute and relative fecundities were 4,612 eggs and 1,535 eggs/kg, respectively; temporal differences in relative fecundity (1996, 2006, 2007, and 2015) were not statistically significant. Lake Trout population fecundity has declined from a peak in 2010 due to reduction in abundance of spawners. The estimated population fecundity of approximately 4.7 million eggs in 2020 represents an 81% decline from the mean estimate of previous samples and an 87% reduction from peak population fecundity. Despite declines in population fecundity, age-2 recruitment has increased in recent years; our results suggest these increases are not related to changes in reproductive demographics, but rather are related to increased prerecruitment survival. Our results provide information for understanding temporal variation in spawning stock biomass of Lake Trout in Yellowstone Lake and the capacity of the population to

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“…However, Lake Trout have been observed using novel geomorphological features and displaying unique behaviours demonstrating there is a lack of understanding regarding reproductive habitats and behaviours of Lake Trout (Callaghan et al 2016;Binder et al 2018;Farha et al 2020). Intra-specific variation in the reproductive biology of Lake Trout appears to be more prevalent among different systems, hence the need to generate population-specific knowledge, particularly when populations are subject to active management (Goetz et al 2021).…”

Section: Reproductionmentioning

confidence: 99%

“…Observations of Lake Trout using undocumented geomorphological features and unique behaviours have demonstrated that reproductive habitats and behaviours of the species are not fully understood (Callaghan et al 2016;Binder et al 2018;Farha et al 2020). As more populations have been studied, high levels of intra-specific variation in the reproductive biology of Lake Trout among different systems have been documented (Goetz et al 2021). Population-specific knowledge is useful for optimizing the management of important fisheries.…”

Section: Introductionmentioning

confidence: 99%

“…This chapter is entirely descriptive and is intended to provide Kenauk fisheries managers and conservation planners with information to ensure that Lake Trout and their habitats are protected during the reproductive period. I examine the extent to which the observations of reproductive biology in Lake Papineau align with the general understanding of Lake Trout reproduction (Marsden et al 1995a;Muir et al 2012;Goetz et al 2021).…”

Section: Introductionmentioning

confidence: 99%

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Investigations of Lake Trout Salvelinus namaycush Ecology and Behaviour in Relation to Fragmented Thermal Habitats to Inform a Multifaceted Management Strategy

Hlina

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Reproduction

Cited by 8 publications

References 164 publications

The Influence of Life History on the Response to Parasitism: Differential Response to Non-Lethal Sea Lamprey Parasitism by Two Lake Charr Ecomorphs

The Influence of Life History on the Response to Parasitism: Differential Response to Non-Lethal Sea Lamprey Parasitism by Two Lake Charr Ecomorphs

Invasive Lake Trout Reproduction in Yellowstone Lake under an Active Suppression Program

Investigations of Lake Trout Salvelinus namaycush Ecology and Behaviour in Relation to Fragmented Thermal Habitats to Inform a Multifaceted Management Strategy

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