Schizothoracinae in Plateau River Networks: Drainage History, Polyploid Genome Evolution, Multi-Omics Evidence Chains, and Conservation Units

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Abstract
The Qinghai–Tibet Plateau and surrounding montane valleys comprise one of the world’s most pronounced freshwater environmental gradients, where cold, intense UV radiation, variable dissolved oxygen, and heterogeneous hydrodynamics interact with drainage reorganization and connectivity constraints. Schizothoracinae are among the most representative endemic lineages in these systems, combining exceptional lineage diversity with pervasive polyploid genomic backgrounds. Here we synthesize schizothoracine research through an “environment–evolution–conservation” framework, linking (i) taxonomic and phylogenetic foundations under pervasive convergence, cryptic diversity, and hybridization; (ii) geologic history and drainage evolution as drivers of radiation and gene exchange; (iii) polyploidy, post-WGD structural remodeling, and early rediploidization as a testable process rather than a static ploidy fact; and (iv) omics resources and analytical pipelines that enable verifiable evidence chains across comparative genomics, population genomics, and tissue-level stress responses. Across major stressors, recurrent molecular themes emerge for cold-associated metabolic remodeling and UV-associated DNA repair and genome maintenance, whereas hypoxia-related signals are often inconsistent, plausibly reflecting strong spatiotemporal heterogeneity and multi-route physiological accommodation. We further connect molecular candidates to functional outcomes using reusable phenotypic evidence streams, including geometric morphometrics, high-throughput phenotyping, otolith microchemistry, and age–growth life-history syndromes of slow growth and longevity. Finally, we translate population structure into operational MU/ESU delineation and propose an auditable, iterative management checklist centered on MU-aligned stocking, connectivity performance metrics during critical seasonal windows, and quantified habitat restoration targets. We conclude by outlining priorities to raise evidentiary strength across basins: chromosome-level genomes across lineages, systematic SV/TE comparisons, standardized stressor–phenotype–transcriptome designs, and intensified sampling in geomorphic transition zones and putative hybrid regions to enable cumulative, decision-ready synthesis.
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