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SUMMARY:Two Tales of Anthropogenic Hybridization in Human-Altered Marine H
 abitats - Nicolas Bierne\, Université de Montpellier
DTSTART:20260205T130000Z
DTEND:20260205T140000Z
UID:TALK240223@talks.cam.ac.uk
CONTACT:131500
DESCRIPTION:Human transport of species across the Anthropocene ocean has i
 ncreased hybridization in human-altered habitats. This hybridization blend
 s divergent genomes into new genomic mosaics and provides valuable natural
  experiments for understanding selective processes in hybrid genomes\, yet
  it remains understudied\, especially in marine environments. I will prese
 nt results from two marine systems: Ciona sea-squirts and Mytilus mussels.
  Introgression from the North Pacific Ciona robusta into the native North 
 Atlantic C. intestinalis was proven to be adaptive\, localized to a genomi
 c region on chromosome 5. Using long-read and linked-read sequencing\, we 
 investigated the molecular variation conferring this advantage. Hybridizat
 ion between the invasive Mytilus galloprovincialis and the native M. eduli
 s led to a new ecotype\, known as the “dock mussel”\, in French commer
 cial ports. Analysis of over 300 dock mussels with a 60K SNP array reveale
 d two chromosomal islands of native parental ancestry\, suggesting adaptiv
 e introgression. However\, contrary to expectations for admixture between 
 two species at the end of the speciation continuum\, the dock mussel genom
 e was found to be fully admixed. This finding is consistent with a multige
 nic fitness landscape model with parental maladaptation\, which predicts s
 election for enhanced ancestry heterozygosity. Admixture and adaptive intr
 ogression may be common evolutionary pathways in novel human-altered habit
 ats such as ports. Future work must integrate phenotypic and environmental
  data to better understand the evolutionary forces shaping hybrid mosaic g
 enomes.
LOCATION:Part II Lecture Theatre\, Department of Zoology
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