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Population-specific phenotypic plasticity of endangered bivalves in response to extreme events

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dc.abstract.enFreshwater mussels are among the most endangered animal groups, highly sensitive to climate change due to their strict dependence on freshwater habitats. While freshwater mussels are often considered ecologically strict, their distribution across broad environmental gradients raises the possibility of population-specific adaptations mediated by phenotypic plasticity. This study investigates whether geographically and climatically distinct populations of two freshwater mussel species (Unio pictorum and Unio delphinus) exhibit different transcriptomic responses to prolonged heat stress and whether these responses reveal signs of local adaptation. We exposed northern and southern populations of both species to gradually increasing temperatures in controlled laboratory conditions, simulating a prolonged thermal extreme event, and RNA-seq was used to quantify differential gene expression. Results showed strong differences between northern and southern populations of the two species, both in the magnitude and functional composition of transcriptomic responses. Southern populations exhibited intense expression shifts involving classical stress pathways, heat shock proteins, detoxification (cytochrome P450s), apoptosis, and energy metabolism, while northern populations, particularly U. delphinus, showed a markedly subdued response. Notably, U. pictorum's northern population relied heavily on the cytochrome P450 family even at moderate temperatures, while the southern populations of both species activated broader proteostasis and immune responses at higher stress thresholds. These findings demonstrate clear population-specific phenotypic plasticity, shaped by environmental conditions rather than phylogenetic proximity. They underscore the need for conservation strategies to move beyond species-level management, embracing intraspecific variation as a buffer against climate impacts. As climate change accelerates, safeguarding the evolutionary potential encoded within populations, not just species, is essential to preserving biodiversity resilience.
dc.affiliationWydział Medycyny Weterynaryjnej i Nauk o Zwierzętach
dc.affiliation.instituteKatedra Zoologii
dc.contributor.authorGomes-dos-Santos, André
dc.contributor.authorLopes-Lima, Manuel
dc.contributor.authorSilva, Beatriz
dc.contributor.authorMachado, André M.
dc.contributor.authorPinto, Rui
dc.contributor.authorÖsterling, Martin
dc.contributor.authorWallerius, Magnus Lovén
dc.contributor.authorUrbańska, Maria
dc.contributor.authorGolski, Janusz Lech
dc.contributor.authorRunowski, Sławomir
dc.contributor.authorKaźmierczak, Sandra
dc.contributor.authorTeixeira, Amílcar
dc.contributor.authorSousa, Ronaldo
dc.contributor.authorC. Castro, L. Filipe
dc.contributor.authorCastro, Paulo
dc.contributor.authorCarvalho, Francisco
dc.contributor.authorFonseca, Elza
dc.contributor.authorFroufe, Elsa
dc.date.accessioned2026-02-20T11:09:25Z
dc.date.available2026-02-20T11:09:25Z
dc.date.issued2026
dc.description.bibliographyil., bibliogr.
dc.description.financepublication_nocost
dc.description.financecost0,00
dc.description.if2,4
dc.description.points70
dc.description.volume58
dc.identifier.doi10.1016/j.cbd.2026.101778
dc.identifier.eissn1878-0407
dc.identifier.issn1744-117X
dc.identifier.urihttps://sciencerep.up.poznan.pl/handle/item/7412
dc.languageen
dc.pbn.affiliationbiological sciences
dc.pbn.affiliationanimal science and fisheries
dc.relation.ispartofComparative Biochemistry and Physiology - Part D: Genomics and Proteomics
dc.relation.pagesart. 101778
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titlePopulation-specific phenotypic plasticity of endangered bivalves in response to extreme events
dc.typeJournalArticle
dspace.entity.typePublication
oaire.citation.volume58