Efforts to improve recreational fisheries have included widespread stocking of Micropterus floridanus outside its native range of peninsular Florida. Hybridization of Florida bass (M. floridanus) with largemouth bass (Micropterus salmoides) has now dramatically expanded beyond a naturally occurring intergrade zone in the southeast U.S. In recent years, there has been growing interest in protecting the genetic integrity of native basses and assessing the impact and nature of M. salmoides/M. floridanus introgression from the standpoint of hatchery and sport-fishery managers, fish biologists, ecologists and evolutionary biologists. Here, we conducted RNA-seq-based sequencing of the transcriptomes of M. salmoides, M. floridanus and their F1 hybrid and identified a set of 3674 SNP markers with fixed-allelic differences from 2112 unique genes. We then developed a subset of 25 of these markers into a single diagnostic multiplex assay and validated its capacity for assessing integrity and hybridization in hatchery and wild populations of largemouth and Florida bass. The availability of this resource, high-quality transcriptomes and a large set of gene-linked SNPs, should greatly facilitate functional and population genomics studies in these key species and allow the identification of traits and processes under selection during introgressive hybridization.
The objective of this study was to characterize the genetics of second generation (F ) koi Cyprinus carpio × goldfish Carassius auratus hybrids. Spermatozoa produced by a novel, fertile F male were found to be diploid by flow-cytometric analysis. Backcross (F female × C. carpio male and C. carpio female × F male) juveniles were triploid, confirming that female and male F hybrids both produced diploid gametes. The vast majority of surviving F juveniles was diploid and small proportions were aneuploid (2·1n-2·3n and 3·1n-3·9n), triploid (3n) and tetraploid (4n). Microsatellite genotyping showed that F diploids repeated either the complete maternal or the complete paternal genotype. Fish with the maternal genotype were female and fish with the paternal genotype were male. This demonstrates that F diploids were the result of spontaneous gynogenesis and spontaneous androgenesis. Analysis of microsatellite inheritance and the sex ratio in F crosses showed that spontaneous gynogenesis and androgenesis did not always occur in equal proportions. One cross was found to have an approximate equal number of androgenetic and gynogenetic offspring while in several other crosses spontaneous androgenesis was found to occur more frequently than spontaneous gynogenesis.
Variability in microsatellite DNA markers in gynogenetic and backcross progenies obtained from ornamental (koi) carp (Cyprinus carpio L.) 3 goldfish (Carassius auratus L.) hybrid females Abstract Inheritance and segregation at five microsatellite loci were studied in diploid gynogenetic and triploid backcross progenies obtained from koi 9 goldfish hybrid females, which produce diploid eggs. Gynogenetic and backcross progenies were obtained from three individual hybrid females by inseminating eggs with genetically inactivated and intact sperm of parental species respectively; no shock treatments were applied to the early embryos. Complete absence of paternally specific alleles at all investigated microsatellite loci has proven successful genetic inactivation of spermatozoa by irradiation and confirmed gynogenetic origin of progenies. Genotypic segregations at microsatellite loci showed almost complete homogeneity of gynogenetic progenies and their identity to female parents. These results correspond with previous cytogenetic data on the occurrence of premeiotic endomitosis in hybrid females producing diploid eggs. Fish from triploid backcross progenies had genotypes resulting from combination of entire diploid female genome and haploid genome from male.
Meta-analysis, the statistical synthesis of pertinent literature to develop evidence-based conclusions, is relatively new to the field of molecular ecology, with the first metaanalysis published in the journal Molecular Ecology in 2003 (Slate & Phua 2003). The goal of this article is to formalize the definition of meta-analysis for the authors, editors, reviewers and readers of Molecular Ecology by completing a review of the meta-analyses previously published in this journal. We also provide a brief overview of the many components required for meta-analysis with a more specific discussion of the issues related to the field of molecular ecology, including the use and statistical considerations of Wright's F ST and its related analogues as effect sizes in meta-analysis. We performed a literature review to identify articles published as 'metaanalyses' in Molecular Ecology, which were then evaluated by at least two reviewers. We specifically targeted Molecular Ecology publications because as a flagship journal in this field, meta-analyses published in Molecular Ecology have the potential to set the standard for meta-analyses in other journals. We found that while many of these reviewed articles were strong meta-analyses, others failed to follow standard meta-analytical techniques. One of these unsatisfactory meta-analyses was in fact a secondary analysis. Other studies attempted metaanalyses but lacked the fundamental statistics that are considered necessary for an effective and powerful metaanalysis. By drawing attention to the inconsistency of studies labelled as meta-analyses, we emphasize the importance of understanding the components of traditional meta-analyses to fully embrace the strengths of quantitative data synthesis in the field of molecular ecology.
The purpose of this study was to investigate mechanisms of inheritance of the sparkling scales (ginrin) trait in ornamental koi, a variant of Common Carp Cyprinus carpio. The fish segregations of ginrin : nonginrin were recorded in three F1 progenies obtained by crosses of ginrin × nonginrin and 16 F2 progenies obtained by crosses of ginrin × ginrin and nonginrin × nonginrin. The segregations of ginrin : nonginrin in most F1 progenies did not differ significantly from the 1:1 Mendelian ratio, while crossing nonginrin fish from F1 progenies resulted in the appearance of only nonginrin fish in F2. Based on these data, it was suggested that the ginrin trait in koi is controlled by a dominant mutation of one gene (Gr/gr): fish with genotypes GrGr and Grgr have ginrin phenotype, while fish with genotype grgr do not possess this trait. In most analyzed F2 progenies obtained by crosses of ginrin × ginrin, the ginrin : nonginrin segregations were statistically different from the 3:1 and 2:1 theoretical ratios with permanent deficit of ginrin fish. It was suggested that the deviation of segregations from theoretical ratios resulted from increased mortality of ginrin fish as a result of possible negative pleiotropic effect of ginrin mutation on fish survival. The negative pleiotropic effect of ginrin mutation on fish growth was detected; nonginrin fish were substantially larger and heavier than ginrin fish from the same progenies raised in the same outdoor tanks.
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