Duration in captivity affects competitive ability and breeding success of male but not female steelhead trout (<i>Oncorhynchus mykiss</i>)

Berejikian, Barry A.; Tatara, Christopher P.; Doornik, Donald M. Van; Humling, Michael; Cooper, Matt R.; Pasley, Chris R.; Atkins, Jeffrey J.

doi:10.1139/cjfas-2019-0255

Cited by 4 publications

(3 citation statements)

References 61 publications

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“…Jacks are also relevant to studies that examine the relative RS of hatchery versus natural-origin salmon. The general trend is that the RS of hatchery-origin fishes is lower than that of natural-origin fishes [ 36 , 43 ], but it depends on the type of hatchery (integrated or segregated) and factors like the source of broodstock and how long fish are held in the hatchery prior to release [ 59 ]. Koch & Narum [ 36 ] suggested that jacks should be accounted for in RS calculations.…”

Section: Discussionmentioning

confidence: 99%

Reproductive success of jack and full-size males in a wild coho salmon population

et al. 2023

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Despite the wealth of research on Pacific salmon Oncorhynchus spp. life histories there is limited understanding of the lifetime reproductive success of males that spend less time at sea and mature at a smaller size (jacks) than full-size males. Over half of returning male spawners can be jacks in some populations, so it is crucial to understand their contribution to population productivity. We quantified adult-to-adult reproductive success (RS) of jacks and their relative reproductive success (RRS) compared to full-size males in a wild population of coho salmon in the Auke Creek watershed, Juneau, Alaska. We used genetic data from nearly all individuals (approx. 8000) returning to spawn over a decade (2009–2019) to conduct parentage analysis and calculate individual RS. The average adult-to-adult RS of jacks (mean = 0.7 and s.e. = 0.1) was less than that of full-size males (mean = 1.1 and s.e. = 0.1). Jack RRS was consistently below 1.0 but ranged widely (0.23 to 0.96). Despite their lower average success, jacks contributed substantially to the population by siring 23% of the total returning adult offspring (1033 of 4456) produced between 2009 and 2015. Our results imply that jacks can affect evolutionary and population dynamics, and are relevant to the conservation and management of Pacific salmon.

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Section: Discussionmentioning

confidence: 99%

Reproductive success of jack and full-size males in a wild coho salmon population

et al. 2023

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“…Further, adaptation to captivity can occur in very few generations (Christie et al, 2012 ), so repeated generations of hatchery rearing would be expected to strengthen domestication selection without input from natural‐origin stocks as predicted by previous models (Baskett & Waples, 2013 ; Ford, 2002 ). Similarly, the length of time that hatchery‐origin fish are reared in a hatchery setting may negatively affect LRS (Berejikian et al, 2020 ). Studies in integrated programs have found little to no significant differences in LRS of crosses containing a hatchery‐origin parent compared to those containing two natural‐origin parents (Ford et al, 2012 ; Hess et al, 2012 ), even after two generations (Janowitz‐Koch et al, 2019 ), providing evidence that there was no reduction in LRS for natural‐origin fish that spawn with hatchery‐origin fish.…”

Section: The Impact Of Hatchery Origin and Captive Rearing On Lifetime Reproductive Successmentioning

confidence: 99%

An evaluation of the potential factors affecting lifetime reproductive success in salmonids

Koch

Narum

2021

Evolutionary Applications

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Lifetime reproductive success (LRS), the number of offspring produced over an organism's lifetime, is a fundamental component of Darwinian fitness. For taxa such as salmonids with multiple species of conservation concern, understanding the factors affecting LRS is critical for the development and implementation of successful conservation management practices. Here, we reviewed the published literature to synthesize factors affecting LRS in salmonids including significant effects of hatchery rearing, life history, and phenotypic variation, and behavioral and spawning interactions. Additionally, we found that LRS is affected by competitive behavior on the spawning grounds, genetic compatibility, local adaptation, and hybridization. Our review of existing literature revealed limitations of LRS studies, and we emphasize the following areas that warrant further attention in future research: (1) expanding the range of studies assessing LRS across different life‐history strategies, specifically accounting for distinct reproductive and migratory phenotypes; (2) broadening the variety of species represented in salmonid fitness studies; (3) constructing multigenerational pedigrees to track long‐term fitness effects; (4) conducting LRS studies that investigate the effects of aquatic stressors, such as anthropogenic effects, pathogens, environmental factors in both freshwater and marine environments, and assessing overall body condition, and (5) utilizing appropriate statistical approaches to determine the factors that explain the greatest variation in fitness and providing information regarding biological significance, power limitations, and potential sources of error in salmonid parentage studies. Overall, this review emphasizes that studies of LRS have profoundly advanced scientific understanding of salmonid fitness, but substantial challenges need to be overcome to assist with long‐term recovery of these keystone species in aquatic ecosystems.

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“…Studies of carryover effects from previous life stages on spawning success include examinations of origin (hatchery vs. wild) and smolt age [288], juvenile experience during migration and river environment [289][290][291], and the upstream migration experience through dams [268,292]. For Atlantic salmon ocean conditions have been included in carryover effect studies [17,293], including from the marine to the subsequent generation egg stage [117,293].…”

Section: Responsesmentioning

confidence: 99%

A Comprehensive Review of the Impacts of Climate Change on Salmon: Strengths and Weaknesses of the Literature by Life Stage

Crozier

Siegel

2023

Fishes

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As we confront novel environmental challenges, a full understanding of the physical and biological processes that govern species responses to climate change will help maintain biodiversity and support conservation measures that are more robust to irreducible uncertainty. However, climate impacts are so complex, and the literature on salmon and trout is so vast that researchers and decision makers scramble to make sense of it all. Therefore, we conducted a systematic literature review of climate impacts on salmon and anadromous trout as a resource for stakeholders, managers, and researchers. We reviewed studies published from 2010 to 2021 that address climate impacts on these fish and organized them in a database of 1169 physical and 1853 biological papers. Papers are labeled with keywords across eight categories related to subject matter and study methods. We compared the literature by biological process and life stage and used these comparisons to assess strengths and weaknesses. We then summarized expected phenotypic and genetic responses and management actions by life stage. Overall, we found the largest research gaps related to species interactions, behavioral responses, and effects that carry over across life stages. With this collection of the literature, we can better apply scarce conservation resources, fill knowledge gaps, and make informed decisions that do not ignore uncertainty.

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Duration in captivity affects competitive ability and breeding success of male but not female steelhead trout (Oncorhynchus mykiss)

Cited by 4 publications

References 61 publications

Reproductive success of jack and full-size males in a wild coho salmon population

Reproductive success of jack and full-size males in a wild coho salmon population

An evaluation of the potential factors affecting lifetime reproductive success in salmonids

A Comprehensive Review of the Impacts of Climate Change on Salmon: Strengths and Weaknesses of the Literature by Life Stage

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