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Record W7028022562

Effet de la sélection et du régime thermique subi par les géniteurs lors de la maturation sexuelle sur la croissance et la survie à l'éclosion et résorption du sac vitellin des alevins d'omble de fonataine (Salvelinus fontinalis). Contribution parentale dans la variance phénotypique

2021· other· fr· W7028022562 on OpenAlexaboutno aff

Bibliographic record

VenueSémaphore (Université du Québec à Rimouski) · 2021
Typeother
Languagefr
Field
Topic
Canadian institutionsnot available
Fundersnot available
KeywordsSexual behaviorDevelopmental stageMedical screeningEnvironmental factorCongenital disease
DOInot available

Abstract

fetched live from OpenAlex

RÉSUMÉ: Dans le cadre du réchauffement climatique et de l'augmentation des connaissances sur l'épigénétique, cette étude fait partie d'un projet plus global visant à approfondir les connaissances sur la transmission intergénérationnelle d'informations liées aux conditions thermiques en période de maturation sexuelle chez l'omble de fontaine (Salvelinus fontinalis). Nous avons testé l'hypothèse que le régime thermique subi par les parents pendant la période de maturation sexuelle pourrait avoir des effets sur la survie, le volume du sac vitellin, le temps de développement et la croissance des alevins aux stades précoces de leur développement, soit à l'éclosion et à la résorption du sac vitellin. Nous avons également vérifié si la sélection génétique pour deux traits d'intérêt (maturation sexuelle tardive et croissance) a des effets, croisés ou non avec les effets de température, sur ces mêmes caractères. Pour ce faire, des croisements de géniteurs de la souche Laval, mais de deux lignées (sélection, contrôle), ont été maintenus soit à un régime thermique chaud, soit à un régime thermique froid (différence de 2°C) durant la période automnale. Suite aux croisements, les œufs et alevins de chaque famille ont été incubés, puis élevés séparément pour toute la durée du projet. Les alevins issus de parents ayant subi un régime thermique plus froid ont mis plus de temps à se développer entre l'éclosion et la résorption de leur sac vitellin. Mais, pour les traits de croissance et de survie, le régime thermique subi par les parents n'a pas induit de variations phénotypiques. Pour l'ensemble des traits, aucun effet d'interaction entre la lignée et le régime thermique subi par les géniteurs n'a été relevé. Dans l'ensemble, les effets parentaux sont significatifs sauf pour le temps de développement. Les effets maternels sont importants, mais diminuent à la résorption du sac vitellin. À ces deux stades de vie, les contributions paternelles sont très faibles, voire négligeables. -- Mot(s) clé(s) en français : régime thermique des parents, effet maternel, effet paternel, sélection, jeunes stades, croissance, survie, temps de développement. -- \nABSTRACT: In the context of global warming and the growing interest on involvement of epigenetics in the adaptation processes, this study aimed to better understand the intergenerational transmission of information related to thermal conditions during sexual maturation in brook trout (Salvelinus fontinalis). We tested the hypothesis that the thermal regime experienced by breeders during sexual maturation may have effects on survival, yolk sac volume, developmental time and growth of fry at early developmental stages, both at hatching and at the yolk sac resorption stage. We also aimed to test whether directional genetic selection for two traits of interest (late sexual maturation and growth) for charr aquaculture significantly influenced whether or not crossed with temperature effects, the same traits. To do so, Laval strain breeders from two lines (selection, control) were submitted to either a cold water regime or a warm mater regime during the fall (2°C difference between the two). Crosses were done and incubation and fry rearing was done in a way that each family was kept separate for the whole duration of the project. Fry issued from breeders maintained at the coldest thermal regime showed a longer development time between hatching and yolk sac resorption. However, for growth and survival traits, the thermal regime experienced by the breeders did not induce phenotypic variations. For all the traits considered in this study, no interaction effect between the lineage and the thermal regime experienced by the breeders were found. Overall, parental effects were significant except for development time. Maternal effects were significant but decreased at the resorption of the yolk sac. At the two life stages considered, paternal contribution was very small to negligible. -- Mot(s) clé(s) en anglais : parental thermal regime, maternal effect, paternal effect, selection, young stages, growth, survival, development time.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.001
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: none
GenreCandidate signal: Empirical · Consensus signal: Empirical
Teacher disagreement score0.002
Threshold uncertainty score0.007

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.001
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0000.000
Science and technology studies0.0000.001
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.001
Insufficient payload (model declined to judge)0.0020.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.007
GPT teacher head0.228
Teacher spread0.221 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designObservational
Domainnot available
GenreEmpirical

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

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Citations0
Published2021
Admission routes1
Has abstractyes

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Same venueSémaphore (Université du Québec à Rimouski)French-language works237,207