Investigating genomic and phenotypic parallelism between piscivorous and planktivorous lake trout ( Salvelinus namaycush ) ecotypes by means of RADseq and morphometrics analyses
Bernatchez, S. | Laporte, M. | Perrier, Charles | Sirois, P. | Bernatchez, L. | Institut de Biologie Intégrative et des Systèmes (IBIS) ; Université Laval [Québec] (ULaval) | Centre d’Ecologie Fonctionnelle et Evolutive (CEFE) ; Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École Pratique des Hautes Études (EPHE) ; Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [Occitanie])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Université du Québec à Chicoutimi (UQAC) | This research was supported by a strategic project grant from the Natural Science and Engineering Research Council of Canada (NSERC) to LB and PS and by Ressources Aquatiques Quebec (RAQ). SB was supported by LB (2012-2013 and 2014-2015) an Alexander Graham Bell scholarship from NSERC (2013-2014), a scholarship from FQRNT (2014). ML was supported by a postdoctoral fellowship from FRQNT (2013-2014) and NSERC (2015-2016). CP was supported by a postdoctoral fellowship from RAQ.
International audience
Показать больше [+] Меньше [-]Английский. Repeated adaptive ecological diversification has commonly been reported in fish and has often been associated with trophic niche diversity. The main goal of this study was to investigate the extent of parallelism in the genomic and phenotypic divergence between piscivorous and planktivorous lake trout ecotypes from Laurentian Shield lakes, Canada. This was achieved by documenting the extent of morphological differentiation using geometric morphometrics and linear measurements as well as the pattern of genomic divergence by means of RADseq genotyping (3925 filtered SNPs) in 12 lakes. Our results indicate that the two ecotypes evolved distinct body shape and several linear measurements in parallel. Neutral genetic differentiation was pronounced between all isolated populations (Mean F-ST=0.433), indicating no or very limited migration and pronounced genetic drift. Significant genetic differentiation also suggested partial reproductive isolation between ecotypes in the two lakes where they are found in sympatry. Combining different outlier detection methods, we identified 48 SNPs putatively under divergent selection between ecotypes, among which 10 could be annotated and related to functions such as developmental processes and ionic regulation. Finally, our results indicate that parallel morphological divergence is accompanied by both parallel and nonparallel genomic divergence, which is associated with the use of different trophic niches between ecotypes. The results are also discussed in the context of management and conservation of this highly exploited species throughout northern North America.
Показать больше [+] Меньше [-]Ключевые слова АГРОВОК
Библиографическая информация
Эту запись предоставил Institut national de la recherche agronomique