Abstract Background Two unvaccinated infants residing in Brooklyn, NY presented to our hospital with Haemophilus influenzae type b (Hib) meningitis within one year of each other. Prior outbreak data suggest that communities with low vaccination rates may have circulation of genetically similar Hib strains. We sought to understand the genomic epidemiology of these geographically related cases, hypothesizing that the strains would be closely related. Mash tree of Hib genomes. One non-typeable H. influenzae (NTHi) genome is included as an outgroup. Study cases described are highlighted. Methods We performed a retrospective chart review of pediatric patients (0-5 years) seen at our multi-center health system between 2013-2023 with a sterile-site culture positive for Hib. Whole genome sequencing (WGS) was performed on Hib isolates from blood and cerebral spinal fluid (CSF) samples from the 2 identified cases. Multi-locus sequence type (MLST) was determined using the PubMLST database. Single nucleotide polymorphisms (SNPs) and indels were detected with snippy. A genetic distance tree (mashtree) including 75 Hib genomes from GenBank was constructed. Results No additional invasive Hib cases were detected over the past 10 years of data. We generated high-quality closed genome sequences from the 2 meningitis cases. Notably, the strains both belonged to a novel MLST, sequence type (ST)-2832, part of the ST-6 complex. Bacterial genetic sequences were identical across sample type (blood vs. CSF) for each patient. Strains from the 2 patients differed at 262 sites (SNPs+indels). A genetic distance tree (Figure) demonstrates that the 2 isolates are more closely related to each other than to any other Hib genomes in the dataset. Conclusion The 2 recent meningitis cases represented an increase in incidence of invasive Hib disease at our institution and were both geographically and genetically linked, sharing a novel MLST. Sporadic cases of closely related Hib strains suggest that an under-vaccinated population serves as a reservoir for community strain circulation. Understanding Hib epidemiology can help target public health campaigns, including vaccination efforts. Disclosures All Authors: No reported disclosures

Rabbit meat is a source of protein and is beneficial to health. Bambu Apus rabbits are formed from crosses of several rabbit breeds and have adapted to the environment of DKI Jakarta. The development of rabbits is expected to support an integrated and sustainable urban livestock farming program (sustainable integrated urban farming). The samples used were 65 adult Bambu Apus rabbits and secondary data from 40 adult Rex rabbits and 40 adult New Zealand White rabbits. The observed variables included body weight and morphometrics such as head length, head width, head height, chest circumference, chest width, chest depth, radius ulna length, humerus length, tibia length, femur length, backbone length, hip width, ear length, and ear width. Variance analysis of each variable was carried out through SAS software version 9.4 using PROC GLM procedure, PROC DISCRIM was used for Mahalanobis distance analysis, PROC CANDISC was used for canonical analysis, and MEGA11 software for phenogram tree. The results of discriminant analysis showed that the Bambu Apus rabbit had different morphometric characteristics from the Rex and New Zealand White rabbit. The average weight of Bambu Apus rabbits was 2473.54±480.13 g higher (P<0.05) than Rex rabbit, chest depth 8.69±1.11 cm greater (P<0.05) than Rex and New Zealand White rabbit, backbone length 37.84±3.51 cm longer (P<0.05) than Rex rabbit. Genetic distance and phenogram tree construction showed low kinship relationship between Bambu Apus rabbit with Rex rabbits and New Zealand White rabbit. The results suggested that the genetic of Bambu Apus rabbit has a predisposed to be produced as tropical climate adapted broiler rabbits.

Foot and mouth disease (FMD) is an infectious vesicular disease of cloven-hoofed animals caused by the FMD virus. It is acute, highly contagious, and has a lot of genetic diversity. The aim of this study was to confirm cases diagnosed in the field as FMD virus (FMDV) infection through identification and molecular characterization based on the amplification of the VP1 gene of FMDV to provide information about serotype, virus clustering, and additional molecular scientific data on FMDV circulating in Indonesia. The samples used in this study were Madura cattle and Ongole Grade cattle, which showed clinical signs of FMD. Twenty-six samples were collected from the vesicular fluid of blister epithelial cells (tongue, gum, and hard palate), oral, and nasal swabs. Those samples underwent a screening test using the real-time reverse transcription-polymerase chain reaction (RT-qPCR) method with a 3D gene target to detect FMDV infection. About 46.15% of samples (12/26) were detected as RT-qPCR positive for FMDV. Those positive results were then amplified by reverse transcription-polymerase chain reaction (RT-PCR) and sequenced using the Sanger sequencing technique targeting the VP1 gene fragment of the FMDV. The sequencing results were analyzed by the Molecular Evolutionary Genetics Analysis (MEGA) software X version, which includes assembly, alignment using ClustalW, amino acid prediction, genetic distance, and phylogenetic tree construction. The result showed that amino acid sequence variations were found in this gene, including at positions 96, 99, 129, 134, 138, 140, 156, 158, and 197, and no changes were found either at the critical amino acid sites at positions 144 (V), 148 (L), 154 (K), and 208 (P) or in the arginine-glycine-aspartic acid (RGD) motif at positions 145–147. Phylogenetic analysis indicated that FMD viruses detected in this study were identified as serotype “O”, topotype “Middle East South Asia (ME-SA)”, lineage “Ind-2001”, and sub-lineage “e” (O/ME-SA/Ind-2001e), which have high homology to the VP1 gene (99–100%) between the viruses studied and the viruses found at the beginning of the FMD outbreak in Indonesia in 2022.

Rainbow trout (Oncorhynchus mykiss) are native to the Pacific Ocean coast of North America and the Kamchatka Peninsula of Russia. Brazilian populations of rainbow trout derive from various imports from European countries, the United States of America (U.S.A.) and Canada, from the 1950 s onwards. A total of 347 samples from nine commercial broodstock groups sampled from five farms in Brazil were genotyped with a panel of 96 SNPs to analyze the genetic diversity and structure of commercial rainbow trout farmed in Brazil. Pairwise coefficients of relatedness of individual animals and coefficients of genetic differentiation and inbreeding of broodstock groups were obtained, in addition to tests of genetic allocation of animals to their respective group. The mean observed and expected heterozygosities were 0.405 and 0.398, respectively. The total Fst was 0.172 and the pairwise Fst estimates considering all strains ranged from 0.036 to 0.338. The UPGMA genetic distance tree shows that broodstocks declared to be originally from Canada (Kamloops region) and from Northern California (Mount Shasta) are the most genetically distant from each other and from the remaining studied groups. Genetic structure analyses suggest a best value of K= 2, separating broodstock groups originally from the U.S.A. and Canada. Structure and Principal Component Analyses (PCA) indicate that the management practices of one of the farms was efficient in properly maintaining different broodstocks separated, while in another farm unwanted admixture has been occurring. Reclassification of these animals using Structure analysis results were corroborated with PCA and GeneClass2 analyses, providing evidence that advanced analyzes with low-density SNP data can be used to improve farm management practices and even correct past errors. The present study represents the first analysis of diversity and genetic structure of commercial rainbow trout farmed in Brazil using SNP markers.

Abstract Obtaining reliable species identification of the legume genus Caragana has been challenging. Until now, species identification was mostly carried out utilizing diagnostic morphological characteristics, in addition to some successful applications of secondary chemical compounds. This study was designed to establish a DNA barcoding protocol enabling unambiguous identification of 238 accessions belonging to 67 species of Caragana. The performance of four DNA barcoding regions nrITS, trnH‐psbA, matK, and rbcL was explored using three analytical approaches, Pairwise Genetic Distance, Sequence Similarity and Phylogenetic Tree method. The chloroplast regions rbcL and matK showed lower discriminatory power compared with the nuclear region internal transcribed spacer (ITS) and the chloroplast region trnH‐psbA. The nrITS outperformed the other regions in the resolution rate. The present study brings forth an efficient barcode locus for Caragana. A barcode based either on a single‐locus nrITS or the combination of nrITS and trnH‐psbA was found to be most suitable for species discrimination with distinctive barcoding gaps. An attempt has also been made to resolve taxonomic issues in the Caragana opulens complex. DNA barcoding tools when complemented with alpha taxonomic evidence can aid in solving complex systematic problems, especially when taxa are characterized by overlapping traits, such as species belonging to the Fabaceae family.

60 samples were randomly isolated 30 samples from the cover of a mobile phone and 30 samples from the finger of its users for people from the city of Mosul - Iraq, most of them are pioneers of life sciences, College of Science, University of Mosul, with a ratio of 15 females and 15 males of different ages, occupation, region, type of device, number of hours of use, and the last date taken. Washing the hands and the user's hand, right or left. The results showed that the cover of the mobile device of a female student in the Department of Life Sciences, College of Science, University of Mosul, at the age of 27 years, was contaminated with the fungus Chaetomium globosum, which grew on PDA medium.it was also noticed that the finger of the mobile device was contaminated by a female student in the Department of life Sciences College of sciences, University of Mosul,28 years old with The yeast Meyerozyma caribbica, and these two samples were recorded in the Gen Bank of the National Center for Biotechnology Information NCBI, the fungus was recorded as Chaetomium globosum B-M1 and given an identification number LC723824.1, while the yeast Meyerozyma caribbica was recorded as Meyerozyma caribbica B-M2 and with definition number is LC723825, .By studying the genetic distance and affinity tree of the fungus Chaetomium globosum B-M1 it was observed that it was identical (2.283), while the affinity ratio with the Chinese one was (2.582) and it was genetically far from the Iranian isolate by (2.852). As for the American isolate, there was genetic divergence with the Iraqi local isolate by (3326.), while it was found from the tree of distance and genetic affinity for the yeast Meyerozyma caribbica B-M2 that it was identical by ( 0.001) with its Japanese counterpart and was genetically far from the Australian isolate by (2.086) . As for the Italian and Dutch isolates there was a genetic divergence with the Iraqi local isolate by (2.304).

The high diversity and limited floral information in tropical forests often pose a challenge for species identification. However, over the past decade, DNA barcoding has been employed in tropical forests, including Sumatran forests, to enhance floristic surveys. This technique facilitates the discrimination of morphologically similar species and addresses the limitations of conventional species identification, which relies on short‐lived reproductive structures. This study aimed to evaluate the efficiency of matK, rbcL, and the combination of both chloroplast markers for species identification in Burseraceae by employing genetic distance and species tree inference. In this study, we collected 197 specimens representing 20 species from five genera of Burseraceae. The highest percentage of specimens' identification (36%) at the species level was obtained using matK + rbcL, followed by matK (31%), and rbcL (7%). The matK dataset presented the highest interspecific divergence with a mean of 0.008. In addition, a lack of barcode gap was observed in both markers, suggesting potential limitations of the core barcodes for distinguishing Sumatran species within Burseraceae. The monophyly test confirmed five species as monophyletic using Bayesian species tree inferences for matK. Overall, our results demonstrate that matK outperforms rbcL in species identification of Burseraceae, whereas their combination did not enhance species delimitation. To improve the molecular species assignments of this family, future studies may consider including more DNA markers in conjuction with matK, and broadening the availability of reference sequences for species that have not yet been included in the databases. The outcomes of molecular species identification vary depending on the taxonomic group under investigation. Implementation of phylogenomics for species delimitation and diagnostic marker development is strongly recommended for tropical biodiversity assessments, especially for poorly studied clades.

The aquaculture industry is dependent on rich fish resources in water bodies. Human activities have led to a rapid decline of fish species. In Asia, the Pangasiidae family is highly valued for its potential for survival and its fillet meat. DNA barcoding is a taxonomic method using genetic markers in organisms mitochondrial DNA (mt DNA) for identification. The phylogeny and identification of Pangasianodon hypophthalmus in the subcontinent is of great concern. For species identification, a precise and rapid technique is DNA barcoding. This method is strongly effective for analyzing the divergence among species. DNA barcoding is more reliable as compared to external morphology. To avoid mislabeling and conservation of species, it is equally useful in juveniles as well as adult stages of fishes. As DNA bar-coding is a taxonomic method that uses small genetic markers in organisms’ mitochondrial DNA (mt DNA) for identification of particular species. In recent study MAGA X and Kimura 2 Parameter was used to evaluate genetic distance and neighbor joining tree was constructed. BOLD and GenBank reveals the nearest identity matches. As mitochondrial cyt-b gene region was successfully used for identifying species and accepted as a standard region for DNA barcoding.

Abstract. Ermawati D, Panjono, Bintara S, Hartatik T. 2022. Diversity of partial sequence leptin gene (Exon 3) in crossbred cattle compared to GenBank database. Biodiversitas 23: 5614-5620. Genetic marker method that is often used to select cattle is Single Polymorphism Nucleotide (SNP). Single Polymorphisms Nucleotide (SNP) has been found in various candidate genes, one of which is the leptin gene. Leptin is a gene that affects reproduction and cattle weight. Therefore, this research aims to identify SNP of the leptin gene (exon 3) in Crossbred cattle by comparison with GenBank data. A sample of Crossbred cattle was taken from Klaten in Central Java, Indonesia. Afterward, DNA sequencing results were analyzed with BioEdit to identify SNP. BioEdit software was used for DNA sequencing alignment part of intron 2, exon 3 and 3'UTR. The MEGA 11.1.1 program was used to analyze and edit the genetic distance and phylogenetic tree based on the SNP leptin gene. The result shows that nine variations of SNPs were found in exon 3. The phylogenetic tree shows that the Crossbred cattle, Bos taurus, Bos indicus, Hereford, Friesian Holstein and Bali, were in the same cluster. HindIII restriction enzyme can be recommended for genotyping Crossbred cattle using PCR RFLP. This research provides information on SNP in the leptin gene so that it can be used for further research on the association of the leptin gene to growth and reproduction.

Background: Uncaria gambir is one Uncaria species that exclusively grows in Indonesia. The phytochemical constituents of this species have been widely explored and its extracts are used as traditional medicine. However, the relationship between Uncaria gambir and other Uncaria species is still unknown. DNA barcoding was used in this study to reveal this relationship. Methods: Genomic DNA was isolated from four main cultivated variants of Uncaria gambir species in Indonesia. ITS primer was used to amplify the specific gene region. Genetic distance analysis was carried out on Uncaria gambir and 12 other Uncaria species. A phylogenetic tree was created to determine the relationship among Uncaria species using the maximum likelihood method. Results: The ITS primer successfully amplified the ITS region in Uncaria gambir. Genetic distance and phylogenetic tree analyses showed that Uncaria gambir has a close relationship with Uncaria scandens, Uncaria yunnanensis, and Uncaria macrophylla which is also indicated by Interspecific distance analysis. Conclusions: Although the DNA barcoding gap is absent in genetic distance analysis, the phylogenetic tree analysis from the ITS region can differentiate Uncaria gambir from other Uncaria species.

Genetic characterization of a collection of Tsantsas from Ecuadorian museums

Kalang (KBuf), Krayan (KrBuf), and Thale Noi buffaloes (TBuf) are swamp buffalo genetic resources in Indonesia and Thailand. The maternally inherited mitochondrial DNA (mtDNA), particularly D-loop region is an important material for phylogenetic inference and analyzing genetic diversity. Therefore, the objectives of the present study were to evaluate genetic diversity and to reconstruct the phylogenetic tree within buffalo breeds in Kalimantan, Indonesia, and Phatthalung, Thailand using mtDNA D-loop sequences. A total of one hundred forty buffaloes (70 males and 70 females) were observed including 40 buffaloes from North (NK), 40 from East (EK), and 40 from South Kalimantan (SK) provinces Indonesia and 20 from Phatthalung (PT) province, Thailand. DNA samples were isolated from buffalo tail hairs. DNA sequences were manually assembled using BioEdit program with consideration of gaps and ambiguous sequences. The phylogenetic tree of buffalo was generated by PHYLIP software. The observed variables included haplotype diversity, genetic distance, and genetic tree. The 956 bp of amplified mtDNA D-loop fragment presented a total of 24 haplotypes with several mutations that included transitions (293), transversions (60), deletions (15), and insertions (20). The neighbor-joining tree using the Kimura 2 parameter model demonstrated two local buffalo clusters among buffalo from Kalimantan and Thailand with four buffalo relationship patterns observed from buffaloes in Kalimantan Island (KBuf and KrBuf), Indonesia. The Results of the present study demonstrated that the buffaloes sequence analysis revealed relatively high diversity and is a good basis to perform selection and modern buffalo breeding development.

Development of hybrid varieties is one of the strategies to increase the productivity and production of Maize (Zea mays L.) in Sri Lanka. Heterosis is an important aspect to measure the hybrid vigor. Genetic distance is a main factor, which affects on heterosis. Identification of suitable parents using molecular markers gives many advantages over morphological evaluation. This study was conducted at the Molecular Biology Laboratory at Plant Genetic Resources Centre, Gannoruwa to identify distant parents using Simple Sequence Repeats (SSR) primers. Genomic DNA was isolated from selected 23 inbred lines including exotic and locally developed lines using modified CTAB method. Molecular characterization was done using four SSR primers; umc1023, phi402893, phi 112 and phi 041. Amplified products were resolved in Polyacrylamide Gel Electrophoresis. Data were manually scored and analysis of genetic variation was carried out using the software POWEMARKER 3.1. Analysis revealed that polymorphism existed for all four SSR primers. Considerable genetic diversity was observed among the loci. Number of alleles per locus ranged from 2 to 3. Polymorphic information content (PIC) ranged from 0.24 (phi112) to 0.42 (phi402893). Gene diversity varied from 0.28 (phi112) to 0.46 (phi402893). Based on the values, it was revealed that there is a high genetic diversity present within the tested inbred lines. Genetic distance was calculated based on Nei’s genetic distance and phylogenetic tree was developed using Unweighted Pair Group Method with Arithmetic Mean (UPGMA). Tested 23 populations could be grouped into four clusters. Most of the exotic inbred lines grouped into one cluster revealed that there is less genetic distances present within the exotic lines. The genetic distance information obtained in this study will be useful to select better parents for development of maize hybrids with good performance.

&lt;p class="MDPI17abstract"&gt;&lt;strong&gt;Objective: &lt;/strong&gt;The objective of this study was to investigate the genetic diversity of Sragen Black Cattle based on D-loop sequences analysis.&lt;/p&gt;&lt;p class="MDPI17abstract"&gt;&lt;strong&gt;Methods: &lt;/strong&gt;A total of 25 blood samples belonged to Sragen Black Cattle that had no genetic relationship within sample. The DNA genome was extracted based on the manufacturer’s standard protocol using gSYNC DNA Mini Kit (Geneaid Biotech Ltd.). D-loop gene was amplified using specific primer forward: 5’- TAGTGCTAATACCAACGGCC-3’ and reverse: 5’- AGGCATTTTGAGTGCCTTGC-3’ and then was sequenced. The sequencing result was aligned and analyzed by Molecular Evolutionary Genetics Analysis (MEGA) version 6.0 to reveal genetic distance and phylogenetic tree. Genetic diversity and haplotype were analysed by DNA Sequence Polymorphism (DnaSp) v6.12.03.&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;&lt;p class="MDPI17abstract"&gt;&lt;strong&gt;Results: &lt;/strong&gt;The results revealed that there were 11 haplotypes with Pi = 0.00675±0.00201 and Hd = 0.767±0.086. Sragen Black Cattle was divided by two cluster in phylogenetic tree with average of genetic distance was 0.0032.&lt;strong&gt;&lt;/strong&gt;&lt;/p&gt;&lt;p class="MDPI17abstract"&gt;&lt;strong&gt;Conclusions: &lt;/strong&gt;In conclusion, all of Sragen Black Cattle are on the same cluster and have closer genetic relationship to Bos indicus rather than Bos taurus with similarity level 85.76 % based on BLAST program.&lt;/p&gt;

Phylogenetic relationships between ten Hordeum vulgare L. , seven cultivars (Giza 123, Giza 126, Giza 127, Giza 128, Giza 129, Giza 130 and Giza 2000) and three landraces from Sinai (El-Kheroba, El-Sheikh Zuwaid, and Wadi Sedr) were carried out using two molecular genetic markers (RAPD-PCR and ISSR-PCR). The genetic distance between Ten genotype was also estimated from banding patterns Twenty two random primers were used in RAPD revealed 316 bands while 159 bands were detected of ISSR analysis using 10 primers. RAPD analysis among ten genotypes showed 41.77% polymorphism, while ISSR analysis showed 62.02% polymorphism. It was found that, ISSR was a more viable marker than RAPD in the detection of the genetic variability among Hordeum vulgare (barley) varieties. The genetic distance tree was detected using UPGMA based on both molecular markers (RAPD and ISSR) and analysis of combined data.In addition, the Band Shearing index (BSI) factor was calculated shows a marked difference between the ten genotypes, seven cultivars and three landraces of studied Hordeum vulgare where BSI average reach 1.42% with RAPD markers while reaching 0.93 % in ISSR. The obtained data indicated that both RAPD and ISSR markers are efficient in identification and differentiation between selected taxa, but the efficiency of ISSR was the best one. Also, the present results, enhancing the available knowledge of Hordeum vulgare genetic resources in Egypt, which may contribute to their conservation and utilization in breeding programs.

In this study, Mediterranean mussels (Mytilus galloprovincialis Lamarck, 1819) were collected from the most important mussel distribution/fishing areas in Turkish coastal waters (Canakkale, Balikesir, Izmir). The presence of parasite was investigated based on molecular methods. Molecular identification of parasite species was established by designing parasite-specific primers for PCR amplification and resulting nucleotide sequences were analysed. As a result of this study, four parasite species were identified as Mytilicola intestinalis Steuer 1902, Mytilicola orientalis Mori 1935, Urastoma cyprinae Graff 1882, Parvatrema duboisi Dollfus 1923 respectively. All identified species were found in Izmir (Agean Sea) specimens while Urastoma cyprinae and Parvatrema duboisi were found only in Canakkale (Dardanelle) and Balikesir (Marmara Sea) specimens. Nucleotide composition, pairwise genetic distance and phylogenetic trees of the detected species were given. This research takes place to be the first study on identifying mussel parasites by using molecular techniques. Also, Mytilicola orientalis is the first record from Turkish coastal waters.

Among the myxozoan parasites, the genus Myxobolus is considered as the emerging parasite in freshwater aquaculture. In the present study, a disease outbreak associated with mass mortality was investigated in a carp farm located at North and Middle Andaman district of Andaman and Nicobar Islands. The affected rohu fry exhibited the clinical signs such as lethargic movement, dark body colouration, loss of appetite, excess mucus secretion, 1-2 mm multifocal white nodules on the body surface and skeletal deformities including spinal curvatures. Molecular characterization using 18S rRNA along with clinical signs identified the causative agent as muscle infecting Myxobolus sp. (GenBank accession number MK128509) which showed 95.45% identity with Myxobolus musculi and 95.23% identity with Myxobolus pseudodispar. Genetic distance and phylogenetic tree analysis were performed to elucidate the relationship between the Myxobolus sp. obtained in the present study and the members of other congeners. This investigation serves as the first report of Myxobolus sp. outbreak from Andaman and Nicobar Islands and also reiterates the need for implementation of strict biosecurity measures to preserve the freshwater aquatic fauna of these Islands.

Phenetic and phylogenetic relationships between ten Hordeum vulgare L. taxa , seven cultivars (Giza 123, Giza 126, Giza 127, Giza 128, Giza 129, Giza 130 and Giza 2000) and three landraces collected from Sinai (El-Kheroba, El-Sheikh Zuwaid and Wadi Sedr). This study was carried out using morphological criteria, molecular genetic markers (SSRs) and finally soluble protein patterns. The results of morphological traits reflected that Giza 2000 and Wadi Sedr gave superior in vegetative growth and yield productivity in contrast to Giza 129, which showed an inferior vegetative growth and yield. The SSR analyses using 7 primers and revealed detection of a total of 15 bands, among which 8 bands (61.22%) were polymorphic. Finally we can conclude that, the genetic distance tree was produced by UPGMA based on morphological data stated the pedigree of studied cultivars. However, in the tree based on molecular markers (SSRs) and soluble proteins patterns were not in full agreement with the pedigree.

Genomic architecture and standing variation can play a key role in ecological adaptation and contribute to the predictability of evolution. In Atlantic cod (Gadus morhua), four large chromosomal rearrangements have been associated with ecological gradients and migratory behavior in regional analyses. However, the degree of parallelism, the extent of independent inheritance, and functional distinctiveness of these rearrangements remain poorly understood. Here, we use a 12K single nucleotide polymorphism (SNP) array to demonstrate extensive individual variation in rearrangement genotype within populations across the species range, suggesting that local adaptation to fine‐scale ecological variation is enabled by rearrangements with independent inheritance. Our results demonstrate significant association of rearrangements with migration phenotype and environmental gradients across the species range. Individual rearrangements exhibit functional modularity, but also contain loci showing multiple environmental associations. Clustering in genetic distance trees and reduced differentiation within rearrangements across the species range are consistent with shared variation as a source of contemporary adaptive diversity in Atlantic cod. Conversely, we also find that haplotypes in the LG12 and LG1 rearranged region have diverged across the Atlantic, despite consistent environmental associations. Exchange of these structurally variable genomic regions, as well as local selective pressures, has likely facilitated individual diversity within Atlantic cod stocks. Our results highlight the importance of genomic architecture and standing variation in enabling fine‐scale adaptation in marine species.

This research was aimed to evaluate levels of genetic diversity and differences among populations of Malayan leaffish in the Mekong Delta. Fish samples were collected from three locations representing two types of habitats, including wetland conservation areas (Lang Sen-Long An and U Minh Ha-Ca Mau) and inland water bodies in Hậu Giang. Six inter-simple sequence repeats (ISSR) markers were used to amplify 95 samples. Results showed that 56 bands (5 to 12 bands per marker) were yielded with the polymorphic rate (P, %) of 86.9% and expected heterozygosity (He) of 0.250. Long An population (n=33) had the highest genetic diversity parameters (P = 98.2%; He=0.289), which were not significantly different (P>0.05) from those of the other two populations in Ca Mau (n=30; P=80.4%; He=0.239) and Hau Giang (n=32; P=80.4%; He=0.245). The three populations had high levels of genetic identity and a large number of migrant per generation (Nm=9.3). Analyses of Nei’s genetic distance and phylogenetic tree indicated Ca Mau and Hau Giang had a genetically closed relatonship, smaller than those between these two populations and Long An population.