Abstract：
Advancements in genome sequencing and assembly techniques have increased the documentation of structural variants in wild organisms. Of these variants, chromosomal inversions are especially prominent due to their large size and active recombination suppression between alternative homokaryotypes. This suppression enables the 2 forms of the inversion to be maintained and allows the preservation of locally adapted alleles. The Barramundi Perch (BP; Lates calcarifer) is a widespread species complex with 3 main genetic lineages located in the biogeographic regions of Australia and New Guinea (AUS + NG), Southeast Asia (SEA), and the Indian Subcontinent (IND). BP are typically considered to be a protandrous sequential hermaphrodite species that exhibits catadromy. Freshwater occupancy and intraspecific variation in life history (e.g. partially migratory populations) exist and provide opportunities for strongly divergent selection associated with, for example, salinity tolerance, swimming ability, and marine dispersal. Herein, we utilize genomic data generated from all 3 genetic lineages to identify and describe 3 polymorphic candidate chromosomal inversions. These candidate chromosomal inversions appear to be fixed for ancestral variants in the IND lineage and for inverted versions in the AUS + NG lineage and exhibit variation in all 3 inversions in the SEA lineage. BP have a diverse portfolio of life history options that includes migratory strategy as well as sexual system (i.e. hermaphroditism and gonochorism). We propose that the some of the life history variabilities observed in BP may be linked to inversions and, in doing so, we present genetic data that might be useful in enhancing aquaculture production and population management.
摘要：
基因组测序和组装技术的进步增加了野生生物中结构变异的文献。在这些变体中，染色体倒位是特别突出的，因为它们的大尺寸和活跃的重组抑制之间的替代同型。这种抑制能够维持两种形式的倒位,并允许保留局部适应的等位基因。Barramundi鲈鱼（Latescalcarifer）是一种广泛的物种复合体，具有位于澳大利亚和巴布亚新几内亚（AUSNG）的生物地理区域的三个主要遗传谱系，东南亚(SEA),印度次大陆（IND）。Barramundi鲈鱼通常被认为是一种原始的雌雄同体物种，表现出催化剂。淡水占有率和生活史的种内变化(例如，部分迁徙人群)的存在，并为与，例如,耐盐性，游泳能力,和海洋扩散。在这里，我们利用从所有三个遗传谱系产生的基因组数据来鉴定和描述三个多态性候选染色体倒位。这些候选染色体倒位似乎对于IND谱系中的祖先变体是固定的，修复了AUS+NG谱系中的反转版本，并在SEA谱系的所有三个倒置中表现出差异。BarramundiPerch拥有多样化的生活史选择组合，其中包括迁徙策略和性系统（即，雌雄同体和淋病)。我们认为，在Barramundi鲈鱼中观察到的一些生活史变异性可能与倒置有关，这样做，我们提供的遗传数据可能有助于提高水产养殖生产和种群管理。
