GROWTH AND SURVIVAL TRADE-OFFS AND OUTBREEDING DEPRESSION IN RAINBOW TROUT (<i>ONCORHYNCHUS MYKISS</i>)

Tymchuk, Wendy E.; Sundström, L. Fredrik; Devlin, Robert H.

doi:10.1111/j.1558-5646.2007.00102.x

Cited by 76 publications

(104 citation statements)

References 58 publications

(69 reference statements)

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“…Transgressive phenotypes in hybrids may thus be the consequence of a deeper genetic distance between parental populations (Stelkens and Seehausen 2009). For instance, in rainbow trout (Oncorhynchus mykiss), outbreeding depression did not appear in introgressed genomes, possibly because coadapted genotypes were too similar for recombination to have a negative impact (Tymchuk et al 2007). Moreover, divergent genomes may accumulate regulatory incompatibilities resulting in occurrence of misexpressed transcripts (OD or UD) in hybrids (Landry et al 2007).…”

Section: Discussionmentioning

confidence: 99%

The Transcriptional Landscape of Cross-Specific Hybrids and Its Possible Link With Growth in Brook Charr (Salvelinus fontinalis Mitchill)

et al. 2010

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The genetic mechanisms underlying hybridization are poorly understood despite their potentially important roles in speciation processes, adaptative evolution, and agronomical innovation. In this study, transcription profiles were compared among three populations of brook charr and their hybrids using microarrays to assess the influence of hybrid origin on modes of transcription regulation inheritance and on the mechanisms underlying growth. We found that twice as many transcripts were differently expressed between the domestic population and the two wild populations (Rupert and Laval) than between wild ones, despite their deeper genetic distance. This could reflect the consequence of artificial selection during domestication. We detected that hybrids exhibited strikingly different patterns of mode of transcription regulation, being mostly additive (94%) for domestic 3 Rupert, and nonadditive for Laval 3 domestic (45.7%) and Rupert 3 Laval hybrids (37.5%). Both heterosis and outbreeding depression for growth were observed among the crosses. Our results indicated that prevalence of dominance in transcription regulation seems related to growth heterosis, while prevalence of transgressive transcription regulation may be more related to outbreeding depression. Our study clearly shows, for the first time in vertebrates, that the consequences of hybridization on both the transcriptome level and the phenotype are highly dependent on the specific genetic architectures of crossed populations and therefore hardly predictable.

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Section: Discussionmentioning

confidence: 99%

The Transcriptional Landscape of Cross-Specific Hybrids and Its Possible Link With Growth in Brook Charr (Salvelinus fontinalis Mitchill)

et al. 2010

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“…The genetic introgression of farmed escapees into native populations (Glover et al 2012) can lead to reduced overall fitness of wild populations (Fleming et al 2000, Gilk et al 2004, Tymchuk et al 2007) and competition for food and habitat (Jonsson & Jonsson 2006, Šegvić-Bubić et al 2011a. Post-escape behaviour of coldwater-aquaculture species, such as Atlantic salmon Salmo salar or Atlantic cod, has been extensively studied (Olsen & Skilbrei 2010, Skilbrei 2010, Chittenden et al 2011, Zimmermann et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Site fidelity of farmed gilthead seabream Sparus aurata escapees in a coastal environment of the Adriatic Sea

Šegvić-Bubić¹,

Arechavala-López²,

Niš³

et al. 2018

Aquacult. Environ. Interact.

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A small escape incident of gilthead seabream Sparus aurata tagged with acoustic transmitters (N = 25) from a commercial farm located in a coastal bay of the eastern Adriatic Sea was simulated to enable evaluation of recapture strategies and escapee management. Over a 3 mo monitoring period, tagged individuals showed spatial distribution closely related to fish farms, where 76 and 68% of tagged fish were present at the farm during the second and third weeks post-release respectively. Upon initial release, escaped seabream had a small total home range (0.142 km 2 ) that encompassed the farm site. Short-term residence differed among tagged fish. Few fish (28%) remained in the proximity of the fish farm for longer than 1 mo; most were likely angled or moved outside the acoustic array. Fish that moved elsewhere have the potential to cause substantial ecological and genetic impact, as they likely are able to quickly adapt to natural conditions. Considering the capture impact of the limited recreational fishery on this small-scale escape event, fish recapture by this type of fishery within 2 wk of escape could be feasible and is highly recommended.

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“…A comparison between selfing, hermaphroditic Caenorhabditis elegans and its gonochoristic (separate males and females) congeneric Caenorhabditis remanei, showed that the sexual species suffered greatly from inbreeding depression, whereas the selfing C. elegans suffered similar consequences from outbreeding (Dolgin et al 2007). In rainbow trout (Oncorhynchus mykiss) under experimental conditions, crossings between wild and captive-reared fish result in outbreeding depression ( Tymchuk et al 2007), and in natural populations of the ornate dragon lizard (Ctenophorus ornatus), more outbred females produced offspring with poorer survival (LeBas 2002). At the extreme, the risk of hybridization can potentially be an important selective pressure biasing fertilization towards genetically more similar mates.…”

Section: Introductionmentioning

confidence: 99%

Males with high genetic similarity to females sire more offspring in sperm competition in Peron's tree frogLitoria peronii

et al. 2008

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Recent work has confirmed that genetic compatibility among mates can be an important determinant of siring success in sperm competition experiments and in free-ranging populations. Most of this work points towards mate choice of less related mates. However, there may also be the potential for mate choice for intermediate or even genetically similar mates to prevent outbreeding depression or hybridization with closely related taxa. We studied relatedness effects on post-copulatory gametic choice and/or sperm competition in an external fertilizer, Peron's tree frog (Litoria peronii ), since external fertilizers offer exceptional control in order to test gametic interaction effects on probability of paternity and zygote viability. Sperm competition experiments were done blindly with respect to genetic relatedness among males and females. Thereafter, paternity of offspring was assigned using eight microsatellite loci. Three hybridization trials between L. peronii and a closely related sympatric species Litoria tyleri were also carried out. In the sperm competition trials, males that are more genetically similar to the female achieved higher siring success compared with less genetically similar males. The hybridization trials confirmed that the two species can interbreed and we suggest that the risk of hybridization may contribute to selection benefits for genetically more similar males at fertilization. To our knowledge, this study is the first to show evidence for post-copulatory selection of sperm from genetically more similar individuals within a natural population.

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GROWTH AND SURVIVAL TRADE-OFFS AND OUTBREEDING DEPRESSION IN RAINBOW TROUT (ONCORHYNCHUS MYKISS)

Abstract: The purpose of this study was to examine, using a rainbow trout (Oncorhynchus mykiss) model system, the fitness consequences

Cited by 76 publications

References 58 publications

The Transcriptional Landscape of Cross-Specific Hybrids and Its Possible Link With Growth in Brook Charr (Salvelinus fontinalis Mitchill)

The Transcriptional Landscape of Cross-Specific Hybrids and Its Possible Link With Growth in Brook Charr (Salvelinus fontinalis Mitchill)

Site fidelity of farmed gilthead seabream Sparus aurata escapees in a coastal environment of the Adriatic Sea

Males with high genetic similarity to females sire more offspring in sperm competition in Peron's tree frogLitoria peronii

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