scholarly journals The role of gene flow in rapid and repeated evolution of cave-related traits in Mexican tetra,Astyanax mexicanus

2018 ◽  
Vol 27 (22) ◽  
pp. 4397-4416 ◽  
Author(s):  
Adam Herman ◽  
Yaniv Brandvain ◽  
James Weagley ◽  
William R. Jeffery ◽  
Alex C. Keene ◽  
...  
Keyword(s):  
Gene Flow ◽  
Astyanax Mexicanus ◽  
Repeated Evolution

scholarly journals The role of gene flow in rapid and repeated evolution of cave related traits in Mexican tetra, Astyanax mexicanus

2018 ◽  
Author(s):  
Adam Herman ◽  
Yaniv Brandvain ◽  
James Weagley ◽  
William R. Jeffery ◽  
Alex C. Keene ◽  
...  
Keyword(s):  
Gene Flow ◽  
Evolutionary Process ◽  
Secondary Contact ◽  
Demographic Model ◽  
Astyanax Mexicanus ◽  
Surface Population ◽  
Whole Genomes ◽  
Repeated Evolution ◽  
Blind Cave ◽  
Genomic Regions

ABSTRACTUnderstanding the molecular basis of repeated evolved phenotypes can yield key insights into the evolutionary process. Quantifying the amount of gene flow between populations is especially important in interpreting mechanisms of repeated phenotypic evolution, and genomic analyses have revealed that admixture is more common between diverging lineages than previously thought. In this study, we resequenced and analyzed nearly 50 whole genomes of the Mexican tetra from three blind cave populations, two surface populations, and outgroup samples. We confirmed that cave populations are polyphyletic and two Astyanax mexicanus lineages are present in our dataset. The two lineages likely diverged ∼257k generations ago, which, assuming 1 generation per year, is substantially younger than previous mitochondrial estimates of 5-7mya. Divergence of cave populations from their phylogenetically closest surface population likely occurred between ∼161k - 191k generations ago. The favored demographic model for most population pairs accounts for divergence with secondary contact and heterogeneous gene flow across the genome, and we rigorously identified abundant gene flow between cave and surface fish, between caves, and between separate lineages of cave and surface fish. Therefore, the evolution of cave-related traits occurred more rapidly than previously thought, and trogolomorphic traits are maintained despite substantial gene flow with surface populations. After incorporating these new demographic estimates, our models support that selection may drive the evolution of cave-derived traits, as opposed to the classic hypothesis of disuse and drift. Finally, we show that a key QTL is enriched for genomic regions with very low divergence between caves, suggesting that regions important for cave phenotypes may be transferred between caves via gene flow. In sum, our study shows that shared evolutionary history via gene flow must be considered in studies of independent, repeated trait evolution.

scholarly journals Premating barriers in young sympatric snail species

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Arina L. Maltseva ◽  
Marina A. Varfolomeeva ◽  
Arseniy A. Lobov ◽  
Polina O. Tikanova ◽  
Egor A. Repkin ◽  
...  
Keyword(s):  
Gene Flow ◽  
Snail Species ◽  
Sympatric Populations ◽  
Gastropod Species ◽  
Shell Size ◽  
Closely Related Species ◽  
Partial Canonical Correspondence Analysis ◽  
In The Wild ◽  
Isolation Index

AbstractSympatric coexistence of recently diverged species raises the question of barriers restricting the gene flow between them. Reproductive isolation may be implemented at several levels, and the weakening of some, e.g. premating, barriers may require the strengthening of the others, e.g. postcopulatory ones. We analysed mating patterns and shell size of mates in recently diverged closely related species of the subgenus Littorina Neritrema (Littorinidae, Caenogastropoda) in order to assess the role of premating reproductive barriers between them. We compared mating frequencies observed in the wild with those expected based on relative densities using partial canonical correspondence analysis. We introduced the fidelity index (FI) to estimate the relative accuracy of mating with conspecific females and precopulatory isolation index (IPC) to characterize the strength of premating barriers. The species under study, with the exception of L. arcana, clearly demonstrated preferential mating with conspecifics. According to FI and IPC, L. fabalis and L. compressa appeared reliably isolated from their closest relatives within Neritrema. Individuals of these two species tend to be smaller than those of the others, highlighting the importance of shell size changes in gastropod species divergence. L. arcana males were often found in pairs with L. saxatilis females, and no interspecific size differences were revealed in this sibling species pair. We discuss the lack of discriminative mate choice in the sympatric populations of L. arcana and L. saxatilis, and possible additional mechanisms restricting gene flow between them.

scholarly journals Molecular Signatures of Reticulate Evolution within the Complex of European Pine Taxa

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 489
Author(s):  
Bartosz Łabiszak ◽  
Witold Wachowiak
Keyword(s):  
Gene Flow ◽  
Reticulate Evolution ◽  
Modeling Framework ◽  
Closely Related Species ◽  
Interspecific Gene Flow ◽  
Nucleotide Sequence Variation ◽  
History Of ◽  
Best Fitting ◽  
Species Integrity

Speciation mechanisms, including the role of interspecific gene flow and introgression in the emergence of new species, are the major focus of evolutionary studies. Inference of taxonomic relationship between closely related species may be challenged by past hybridization events, but at the same time, it may provide new knowledge about mechanisms responsible for the maintenance of species integrity despite interspecific gene flow. Here, using nucleotide sequence variation and utilizing a coalescent modeling framework, we tested the role of hybridization and introgression in the evolutionary history of closely related pine taxa from the Pinus mugo complex and P. sylvestris. We compared the patterns of polymorphism and divergence between taxa and found a great overlap of neutral variation within the P. mugo complex. Our phylogeny reconstruction indicated multiple instances of reticulation events in the past, suggesting an important role of interspecific gene flow in the species divergence. The best-fitting model revealed P. mugo and P. uncinata as sister species with basal P. uliginosa and asymmetric migration between all investigated species after their divergence. The magnitude of interspecies gene flow differed greatly, and it was consistently stronger from representatives of P. mugo complex to P. sylvestris than in the opposite direction. The results indicate the prominent role of reticulation evolution in those forest trees and provide a genetic framework to study species integrity maintained by selection and local adaptation.

Introgression between non-sister species of honeyeaters (Aves: Meliphagidae) several million years after speciation

2019 ◽  
Vol 128 (3) ◽  
pp. 583-591
Author(s):  
Leo Joseph ◽  
Alex Drew ◽  
Ian J Mason ◽  
Jeffrey L Peters
Keyword(s):  
Gene Flow ◽  
Reproductive Isolation ◽  
Sex Chromosomes ◽  
Common Ancestor ◽  
Sister Species ◽  
Species Boundaries ◽  
North Eastern ◽  
The City

Abstract We reassessed whether two parapatric non-sister Australian honeyeater species (Aves: Meliphagidae), varied and mangrove honeyeaters (Gavicalis versicolor and G. fasciogularis, respectively), that diverged from a common ancestor c. 2.5 Mya intergrade in the Townsville area of north-eastern Queensland. Consistent with a previous specimen-based study, by using genomics methods we show one-way gene flow for autosomal but not Z-linked markers from varied into mangrove honeyeaters. Introgression barely extends south of the area of parapatry in and around the city of Townsville. While demonstrating the long-term porosity of species boundaries over several million years, our data also suggest a clear role of sex chromosomes in maintaining reproductive isolation.

Gene flow within the M evolutionary lineage ofApis mellifera: role of the Pyrenees, isolation by distance and post-glacial re-colonization routes in the western Europe

Apidologie ◽  
2007 ◽  
Vol 38 (2) ◽  
pp. 141-155 ◽  
Author(s):  
Irati Miguel ◽  
Mikel Iriondo ◽  
Lionel Garnery ◽  
Walter S. Sheppard ◽  
Andone Estonba
Keyword(s):  
Gene Flow ◽  
Western Europe ◽  
Isolation By Distance ◽  
Colonization Routes ◽  
Evolutionary Lineage

scholarly journals Examining the role of parasites in limiting unidirectional gene flow between lake and river sticklebacks

2019 ◽  
Vol 88 (12) ◽  
pp. 1986-1997
Author(s):  
Noémie I. Erin ◽  
Daniel P. Benesh ◽  
Tina Henrich ◽  
Irene E. Samonte ◽  
Per J. Jakobsen ◽  
...  
Keyword(s):  
Gene Flow

scholarly journals Gene flow and population structure in the Mexican blind cavefish complex (Astyanax mexicanus)

2012 ◽  
Vol 12 (1) ◽  
pp. 9 ◽  
Author(s):  
Martina Bradic ◽  
Peter Beerli ◽  
Francisco J García-de León ◽  
Sarai Esquivel-Bobadilla ◽  
Richard L Borowsky
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
Astyanax Mexicanus ◽  
Blind Cavefish

Effects of Chinese honeybee foraging on oilseed rape gene flow and honey ingredients

2017 ◽  
Vol 155 (10) ◽  
pp. 1623-1632
Author(s):  
F. X. LIU ◽  
C. P. BU ◽  
T. TANG ◽  
G. M. CHEN ◽  
S. K. GU ◽  
...  
Keyword(s):  
Gene Flow ◽  
Oilseed Rape ◽  
Safety Management ◽  
Apis Cerana ◽  
Pollen Grains ◽  
Intermediate Frequency ◽  
Scientific Basis ◽  
Trade Disputes ◽  
Exogenous Genes

SUMMARYHoneybee foraging can transfer exogenous genes from genetically modified (GM) oilseed rape (Brassica napusL.) to closely related plants, which not only induces potential ecological risks but also contaminates non-GM seeds or honey products with GM ingredients. These events may lead to international trade disputes. Chinese honeybees (Apis cerana ceranaFabricius) and a herbicide (glufosinate)-resistant GM strain ofB. napus(Z7B10) were studied to examine the effects of honeybee short-range foraging on oilseed rape gene flow and honey ingredients. Results showed variable frequencies of gene flow between GM and non-GM oilseed rape cultivars, with the highest frequency under nylon net isolation with artificially stocked honeybees, the lowest frequency under nylon net isolation alone, and an intermediate frequency under natural pollination, suggesting the important role of honeybee foraging in gene flow frequency. Additionally, GM pollen grains were found in honey collected from honeybees foraging on both GM and non-GM oilseed rape cultivars. The phosphinothricin acetyltransferase protein was also detected in both unbroken pollen-containing and pollen-free honey by protein testing strips, suggesting that honeybee foraging on GM oilseed rape could lead to contamination with GM ingredients. Overall, the results provide a direct scientific basis for the ecological risk assessment and safety management of GM oilseed rape.

Evolutionary dynamics of cycle length in pearl millet: the role of farmer’s practices and gene flow

Genetica ◽  
2011 ◽  
Vol 139 (11-12) ◽  
pp. 1367-1380 ◽  
Author(s):  
Ghayas Lakis ◽  
Athman Maï Ousmane ◽  
Douka Sanoussi ◽  
Abdoulaye Habibou ◽  
Mahamane Badamassi ◽  
...  
Keyword(s):  
Gene Flow ◽  
Pearl Millet ◽  
Cycle Length ◽  
Evolutionary Dynamics
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