The genetic consequences of hatchery-induced sperm competition in a salmonid

Wedekind, Claus; Rudolfsen, Geir; Jacob, Alain; Urbach, Davnah; Müller, R.

doi:10.1016/j.biocon.2007.01.025

Cited by 71 publications

(52 citation statements)

References 70 publications

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“…Supportive breeding is also an important measure to reduce the short-term probability of population extinction, but artificial breeding programs should be designed so as not to further reduce the effective population size (Ryman et al, 1995b;Campton, 2004). Wedekind et al (2007) suggests that hatchery-induced sperm competition not only increases the loss of genetic variation but may also induce artificial selection, depending on the fertilization protocols. Thus, the minimization of genetic risks linked to the in vitro fertilization is crucial.…”

Section: Discussionmentioning

confidence: 99%

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Iaffaldano¹,

Iorio²,

Manchisi³

et al. 2016

Turk. J. Fish. Aquat. Sci.

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This research aimed to provide a characterization of fresh semen in wild and threatened Mediterranean brown trout (Salmo cettii), inhabiting the Biferno River basin and to study the variance of sperm parameters in a reproductive system with high male competition. The evaluated sperm quality parameters were: volume, density, viability, motility and sperm movement duration. High variability in sperm traits were found probably in response to the heterogeneity of individual condition, social status, spawning activity and migration costs. Duration of motility was positively correlated (P<0.05) with age class of breeders and motility. Stronger positive correlations (P<0.001) were observed between motility and viability and between sperm counts and viable sperms. This study reported the first data about semen quality of an Italian wild population of native trout. These results are useful for planning efficient artificial fertilization protocols in restoration programs involving supportive breeding together with other innovative conservation strategies as gamete cryopreservation.

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Section: Discussionmentioning

confidence: 99%

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Iaffaldano¹,

Iorio²,

Manchisi³

et al. 2016

Turk. J. Fish. Aquat. Sci.

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“…Second, as large females usually produce larger offspring of higher viability (Trippel 1995;Walsh et al 2006), a decrease in growth could impair the recruitment and consequently the long-term yield of the population. Third, as females in many species prefer to mate with large males (Wedekind et al 2007;Hutchings and Rowe 2008;Rudolfsen et al 2008;Jacob et al 2009;Labonne et al 2009) increased mortality of large fish could have an impact on sexual selection and therefore on mating behaviour. Fourth, non-random mortality could decrease the genetic diversity of the population and make it more vulnerable to environmental changes or diseases (Jones et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Change in individual growth rate and its link to gill-net fishing in two sympatric whitefish species

2010

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Size-selective fishing is expected to affect traits such as individual growth rate, but the relationship between the fishery-linked selection differentials and the corresponding phenotypic changes is not well understood. We analysed a 25-year monitoring survey of sympatric populations of the two Alpine whitefish Coregonus albellus and C. fatioi. We determined the fishing-induced selection differentials on growth rates, the actual change of growth rates over time, and potential indicators of reproductive strategies that may change over time. We found marked declines in adult growth rate and significant selection differentials that may partly explain the observed declines. However, when comparing the two sympatric species, the selection differentials on adult growth were stronger in C. albellus while the decline in adult growth rate seemed more pronounced in C. fatioi. Moreover, the selection differential on juvenile growth was significant in C. albellus but not in C. fatioi, while a significant reduction in juvenile growth over the last 25 years was only found in C. fatioi. Our results suggest that size-selective fishing affects the genetics for individual growth in these whitefish, and that the link between selection differentials and phenotypic changes is influenced by species-specific factors.

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“…In sharp contrast, current fish-farming practices generally depend on a small number of spawners and fertilise entire clutches with mixed-milt from two or three males only (Unfer, unpublished). Such an approach is likely to reduce genetic variability of hatchery strains and is probably even aggravated through sperm competition (Wedekind et al, 2007). Follow-up genetic projects, extending grayling sampling to larger parts of the Drava system and its primary tributaries should be promoted in order to unravel microgeographic population structure and define numbers and spatial distribution of intra-basin management units for conservation.…”

Section: > Fisheries Management Conservation Implications and Futurementioning

confidence: 99%

Good news for conservation: mitochondrial and microsatellite DNA data detect limited genetic signatures of inter-basin fish transfer inThymallus thymallus(Salmonidae) from the Upper Drava River

Meraner

Unfer²,

Gandolfi

2013

Knowl. Managt. Aquatic Ecosyst.

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Key-words:European grayling, Thymallus thymallus, genetic introgression, Drava/Drau River, stocking In the last few decades, numerous populations of European grayling, Thymallus thymallus, have been suffering from stocking-induced genetic admixture of foreign strains into wild populations. Concordantly, genetic introgression was also reported for grayling stocks inhabiting the Upper Drava River, but all published genetic data based on specimens caught at least a decade ago, when stocking load was strong. Here, we applied mitochondrial control region sequencing and nuclear microsatellite genotyping to Upper Drava grayling fry collections and reference samples to update patterns and extent of human-mediated introgression. In contrast to previous data, we highlighted an almost genetic integrity of Drava grayling, evidencing limited genetic signatures of trans-basin stocking for grayling of Northern Alpine Danubian origin. Recent hybridisation was detected only twice among sixty-nine samples, while several cases of later-generation hybrids were disclosed by linking mitochondrial sequence to nuclear genetic data. The observed past, but very limited recent genetic introgression in grayling from Upper Drava seems to reflect shifting stocking trends, changing from massive introduction of trans-basin fish to more conservation-oriented strategies during the last 27 years. In a conservation context, we encourage pursuing the use of local wild grayling for supportive-and captive-breeding, but underline the need for genetic approaches in brood-stock selection programs. Finally, our integrated results from sibship reconstruction validate our strictly fry-based sampling scheme, thus offering a reasonable alternative also for other rheophilic fish species with similar life-history characteristics. RÉSUMÉBonne nouvelle pour la conservation : les données de l'ADN mitochondrial et des microsatellites détectent des signatures génétiques limitées de transfert entre bassins du poisson Thymallus thymallus (Salmonidae) dans le cours supérieur de la rivière Drava Mots-clés :Ombre commun, Thymallus thymallus, Au cours des dernières décennies, de nombreuses populations d'ombre commun, Thymallus thymallus, ont souffert de mélange génétique induit par des alevinages dans les populations sauvages utilisant des souches étrangères. Une introgression génétique a également été signalée pour des stocks d'ombre de la rivière Drava amont, mais toutes ces données génétiques publiées sont basées sur des

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The genetic consequences of hatchery-induced sperm competition in a salmonid

Cited by 71 publications

References 70 publications

Untitled

Untitled

Change in individual growth rate and its link to gill-net fishing in two sympatric whitefish species

Good news for conservation: mitochondrial and microsatellite DNA data detect limited genetic signatures of inter-basin fish transfer inThymallus thymallus(Salmonidae) from the Upper Drava River

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