共查询到20条相似文献,搜索用时 31 毫秒
1.
Serene Hargreaves Nigel Maxted Ryoko Hirano Michael Abberton Leif Skøt Brian V. Ford-Lloyd 《Conservation Genetics》2010,11(4):1317-1326
Island populations are often thought to be more susceptible to the loss of genetic diversity as a consequence of limited population
size and genetic drift, greater susceptibility to detrimental stochastic events and low levels of immigration. However the
geographic isolation of islands may create refuges for native crop species whose genetic diversity is threatened from the
genetic erosion occurring in mainland areas as a result of crop-wild gene flow and genetic swamping. Many UK islands remain
uncharacterised in terms of plant genetic diversity. In this study we compared the genetic diversity of mainland populations
and landraces of Trifolium repens with wild populations collected from the islands surrounding the UK, including the island of Hirta in the St Kildan archipelago.
Individuals from St Kilda represent a unique conservation resource, with populations both highly differentiated from UK mainland
populations and genetically distinct from cultivated varieties, whilst able to retain diversity through limited human influence
on the islands. In contrast, there is relative genetic similarity of wild UK populations to cultivated forms highlighted in
mainland populations, but with geographic barriers preventing complete homogenisation of the mainland UK genepool. We underline
the need for conservation priorities to include common species that are threatened by gene flow from cultivation, and draw
attention to the potential of islands to preserve natural levels of genetic diversity. 相似文献
2.
Yuri J. Peña-Ramírez Israel García-Sheseña Ángel Hernández-Espinoza Alfredo Domínguez-Hernández Felipe A. Barredo-Pool José A. González-Rodríguez Manuel L. Robert 《Plant Cell, Tissue and Organ Culture》2011,105(2):203-209
Spanish red cedar (Cedrela
odorata L.) is a tropical timber tree native to the Americas from southern Mexico to northern Argentina. Commercial plantations are
scarce and, consequently, natural populations are overexploited. Traditional propagation practices for the establishment of
large-scale plantations have had limited success in this species due to the relative scarcity of seeds, its broad genetic
diversity and the lack of domesticated varieties. In vitro clonal propagation provides an effective method to overcome this
situation and increase the yield of commercial plantations through the rapid multiplication of elite materials. Somatic embryogenesis
(SE) is one of the most promising strategies for tree propagation due to the possibility of producing artificial seeds, the
ability to store and rapidly mobilize germplasm and the opportunity for genetic manipulation. We report here the induction
of indirect SE in C. odorata from calli derived from immature zygotic embryos after 12 weeks of culture. Macroscopic, histological, and scanning electron
microscopic analyses of the calli revealed the presence of embryogenic cell clusters that formed cotyledonary embryos with
clear bipolar structures and no vascular connections with the mother tissue. Different media preparations containing combinations
of diverse auxins and cytokinins are known to have different effects on the type and frequency of embryogenic structures.
Embryo conversion was achieved using an MS-based medium [Murashige T, Skoog F (1962) Physiol Plant 15:473–497, 1962] supplemented
with abscisic acid, and transfer to soil was successful at a rate of 75%. The method described here provides a basis for optimizing
the clonal propagation and genetic manipulation of this valuable species. 相似文献
3.
V. M. Makeeva A. V. Smurov D. V. Politov M. M. Belokon Y. S. Belokon E. G. Suslova 《Russian Journal of Genetics》2018,54(9):1040-1049
The genetic diversity of four population of Norway spruce (Picea abies (L.) Karst.) in Moscow parks have been studied. For the first time, a comparison of the gene pool of planted stands in urban areas with the gene pool of natural populations and planted stands of the Moscow region investigated earlier revealed a significant reduction in the genetic diversity of planted stands of Moscow parks in comparison with conditionally native populations from the Moscow region. In three of the four urban planted stands, a decrease was revealed in the proportion of polymorphic loci (down to 0.41 and 0.50) compared to conditionally native forests (0.64). All plant stands do not differ from conditionally native in terms of average heterozygosity and average number of alleles per locus. However, the test for allelic frequency heterogeneity demonstrated a significant difference of all planted stands (from Moscow and the Moscow region) from conditionally native populations both by 3–11 loci and by all (17) polymorphic loci. The quality of the gene pool of three of the four Moscow planted stands was evaluated as unsatisfactory and one of them as critical. A reduction in viability of urban planted stands with a reduced gene pool diversity was revealed: two of the three plantations died. In our opinion, this is a consequence of the sharp deviations of the observed diversity of the gene pool of the studied plantations from the natural norm, i.e., an optimal state of the gene pool historical in this natural area. Thus, economic necessity of genetic control over the state of saplings in reforestation is obvious. 相似文献
4.
Understanding patterns of genetic diversity at the landscape scale will enhance conservation and management of natural populations. Here we analyzed the genetic diversity, population connectivity, and spatial genetic structure among subpopulations and age groups of Olea europaea subsp. cuspidata, a cornerstone species of the Afromontane highlands. The study was conducted at the landscape level within a radius of approximately 4 km, as well as on a fine scale (intensive study plot) of less than 300 m radius. In total 542 samples from four natural subpopulations in northwestern Ethiopia were analyzed using ten nuclear microsatellite markers. Inbreeding was higher in smaller populations. No genetic difference was detected among cohorts of different tree sizes in the intensive studied plot. Average population differentiation was low but significant (F ST ?=?0.016). Landscape genetic analysis inferred two groups: the most distant subpopulation WE located less than 4 kms from the other three subpopulations formed a separate group. Sixty-four percent of the total migrants were shared among the three latter subpopulations, which are spatially clustered. Immigrants were non-randomly distributed inside of the intensive study plot. Significant spatial genetic structure (SGS) was found both at the landscape scale and in the intensive study plot, and adults showed stronger SGS than young trees. An indirect estimate of 220 m as mean gene dispersal distance was obtained. We conclude that even under fragmentation migration is not disrupted in wild olive trees and that large protected populations at church forests are very important to conserve genetic resources. However, the higher level of inbreeding and evidence for population bottlenecks in the small populations, as well as the persisting heavy pressure on most remaining populations, warrants quick action to maintain genetic diversity of wild olive in the Ethiopian highlands. 相似文献
5.
Haiyan Zhang Shengli Zhang Yang Zhang Linping Zhang Dong Li Longxi He Fenggang Luan 《Applied Entomology and Zoology》2017,52(2):247-253
The Chinese weevil, Hylobitelus xiaoi Zhang, is a major pest affecting the pine industry throughout southern China, but its dispersal is still poorly understood. We aimed to investigate its dispersal by assessing the genetic structure of seven geographical populations, using the distribution of two mitochondrial genes (cytochrome c oxidase subunit I and cytochrome b). A 1212-bp fragment of the two mitochondrial genes was sequenced for 70 individuals from seven geographical populations. The gene sequences included 861 conserved sites, 351 variable sites, 254 parsim-info sites, and 97 singleton sites. These polymorphic sites defined 24 haplotypes with a haplotype diversity of 0.825. Nucleotide diversity was low (0.04568). The differentiation parameter (0.619) was much greater than the coefficient of genetic differentiation (0.285). An analysis of molecular variance suggested that most of the variation was due to within-population differences (61.68%). This molecular data also demonstrated that there is significant divergence among the seven sampled populations of H. xiaoi. This is probably due to habitat fragmentation, preventing effective gene flow between sites. Our molecular evidence supports the view that the Chinese weevil is a native pest, and that outbreaks of H. xiaoi are caused by large plantations of the exotic slash pine. 相似文献
6.
N. V. Gordeeva O. N. Kholod G. A. Dvoryankin D. S. Sendek O. P. Sterligova 《Journal of Ichthyology》2009,49(1):23-31
The genetic analysis is made on the population of the European smelt Osmerus eperlanus occasionally introduced to Lake Syamozero (Karelia) and of the vendace Coregous albula supposedly acclimatized in Solovetskie Islands as a result of fish cultural activities of the Solovetskii Monastery. They are compared with several natural populations—possible donors for both introductions. Genetic variation in a sample of smelt was estimated by means of restrictase analysis of mtDNA (fragment ND1/ND2) in samples of vendace—by means of allozyme analysis of six isoenzyme systems. The probable population for the Syamozero smelt is the population of Onega Lake in spite of the previously noted greater morphological similarity of colonizers with the smelt of Ladoga Lake. A high level of genetic variation in the Syamozero smelt in comparison with native populations indicates that, beside the introduction from Onega Lake, there were repeated introductions from neighboring water bodies. The genetic analysis of the Solovetskaya vendace does not prove that the vendace appeared on islands due to acclimatization. Frequencies of alleles of allozyme loci in the Solovetskaya population significantly differ from frequencies in continental populations. Still, it is compared with some populations of the Arkhangelsk oblast. Estimations of genetic diversity of the Solovetskaya vendace turned out to be comparable with those in native populations. 相似文献
7.
The evolution of increased competitive ability (EICA) hypothesis predicts that release from natural enemies in the introduced
range favors exotic plants evolving to have greater competitive ability and lower herbivore resistance than conspecifics from
the native range. We tested the EICA hypothesis in a common garden experiment with Sapium sebiferum in which seedlings from native (China) and invasive (USA) populations were grown in all pairwise combinations in the native
range (China) in the presence of herbivores. When paired seedlings were from the same continent, shoot mass and leaf damage
per seedling were significantly greater for plants from invasive populations than those from native populations. Despite more
damage from herbivores, plants from invasive populations still outperformed those from native populations when they were grown
together. Increased competitive ability and higher herbivory damage of invasive populations relative to native populations
of S. sebiferum support the EICA hypothesis. Regression of biomass against percent leaf damage showed that plants from invasive populations
tolerated herbivory more effectively than those from native populations. The results of this study suggest that S. sebiferum has become a faster-growing, less herbivore-resistant, and more herbivore-tolerant plant in the introduced range. This implies
that increased competitive ability of exotic plants may be associated with evolutionary changes in both resistance and tolerance
to herbivory in the introduced range. Understanding these evolutionary changes has important implications for biological control
strategies targeted at problematic invaders. 相似文献
8.
Natalia B. Arancibia Mariana Solans M. Cecilia Mestre Eugenia E. Chaia 《Symbiosis (Philadelphia, Pa.)》2018,76(2):129-137
Large areas in the extra-Andean region in the forest - steppe ecotone in “Northwestern Argentinean Patagonia” have been replaced by plantations of the exotic conifer Pinus ponderosa which modify soils physical and chemical factors and alter the biodiversity. Considering that in the region occur saprophytic soilborne actinobacteria that play important role as the fixation of atmospheric nitrogen (N2) in symbiosis with native plant species and the production of bioactive molecules in plants rhizosphere, we aimed to study the effect of the plantation on the abundance of the N2 fixer Frankia and on the genus diversity of cultivable rhizospheric actinobacteria. The study was performed with soils of six paired sites with pine plantations and natural neighbor areas (including steppes or shrublands). Abundance of infective Frankia was estimated by evaluating the nodulation capacity of soils, through a plant bioassay using Ochetophila trinervis as trap plant. Isolation trials for saprophytic actinobacteria were performed by applying chemotactic and successive soils dilutions methods. We concluded that P. ponderosa afforestation affect soil actinobacteria. This was mainly evidenced by a decrease in the Frankia nodulation capacity in O. trinervis, which was related to plantation age, to lower soil carbon and nitrogen content, higher available phosphorus, and to a slight decrease in soils pH. Pine plantation influence on the cultivable saprophytic actinobacteria was less clear. The study highlights the importance of soils as source of Frankia and rhizospheric actinobacteria in relation to disturbance caused by pine plantation in natural environments with native actinorhizal plant species. 相似文献
9.
Pablo Corcuera Pedro Luis Valverde José Alejandro Zavala-Hurtado Gabriela De la Rosa César Gabriel-Durán 《Journal of Insect Conservation》2010,14(6):711-719
Eucalyptus spp. are commonly planted, forming non-native plantations, including the tropics and their wildlife conservation value is
relatively unknown. Recent studies have concluded that secondary forests and tree plantations are less diverse than well-developed
tropical rain forests. However, introduced Eucalyptus stands harbored similar species richness to surrounding native woodland in temperate woodlands in North America though the
identity of the species present may differ. Species composition, as well as dominance curves and differences in community
structure add additional insight to understanding faunistic responses to replacement of native woodland by Eucalyptus plantations. Here, we compared species richness, diversity patterns, and the distribution of non-weaving spiders between
native woodlands and Eucalyptus plantations in a temperate region of Mexico. We found more Lycosidae species in all plantation stands. Other community attributes were not consistently different between plantations and native
woodlands. This is explained by similarities between, and differences within, the understory of the two main vegetation types.
Multivariate analyses identified three spider groups and five spider species could be identified as indicators of these groups.
A comparison of the number of species of the wandering spiders between the two vegetation types suggests a compensation pattern
that is reported here for the first time. 相似文献
10.
The flagfish (Jordanella floridae) is commonly used in studies of wetlands ecology. Here we describe the isolation of ten microsatellite loci, six of which
were polymorphic. The observed number of alleles ranged from 4 to 24 and observed heterozygosities ranged from 0.59 to 0.81
for the polymorphic loci. The isolation of these markers will enable estimations of genetic diversity in natural populations. 相似文献
11.
van Overbeek LS Franke AC Nijhuis EH Groeneveld RM da Rocha UN Lotz LA 《Microbial ecology》2011,62(2):257-264
The bacterial community compositions in Chenopodium album and Stellaria media seeds recovered from soil (soil weed seedbank), from bulk soil, and from seeds harvested from plants grown in the same soils
were compared. It was hypothesized that bacterial communities in soil weed seedbanks are distinct from the ones present in
bulk soils. For that purpose, bacterial polymerase chain reaction denaturing gradient gel electrophoresis (PCR–DGGE) fingerprints,
made from DNA extracts of different soils and seed fractions, were analyzed by principal component analysis. Bacterial fingerprints
from C. album and S. media seeds differed from each other and from soil. Further, it revealed that bacterial fingerprints from soil-recovered and plant-harvested
seeds from the same species clustered together. Hence, it was concluded that microbial communities associated with seeds in
soil mostly originated from the mother plant and not from soil. In addition, the results indicated that the presence of a
weed seedbank in arable soils can increase soil microbial diversity. Thus, a change in species composition or size of the
soil weed seedbank, for instance, as a result of a change in crop management, could affect soil microbial diversity. The consequence
of increased diversity is yet unknown, but by virtue of identification of dominant bands in PCR–DGGE fingerprints as Lysobacter oryzae (among four other species), it became clear that bacteria potentially antagonizing phytopathogens dominate in C. album seeds in soil. The role of these potential antagonists on weed and crop plant growth was discussed. 相似文献
12.
Qiang Fan Sufang Chen Renchao Zhou Xu Xiang Wenbo Liao Suhua Shi 《Conservation Genetics》2011,12(3):753-760
Understanding the amount and distribution of genetic diversity in natural populations can inform the conservation strategy
for the species in question. In this study, genetic variation at eight nuclear microsatellite loci was used to investigate
genetic diversity and population structure of wild litchi (Litchi chinensis Sonn. subsp. chinensis). Totally 215 individuals were sampled, representing nine populations of wild litchi. All eight loci were polymorphic, with
a total of 51 alleles. The expected heterozygosity in the nine populations ranged from 0.367 to 0.638 with an average value
of 0.526. Inbreeding within wild litchi populations was indicated by a strong heterozygote defect. Significant bottleneck
events were detected in the populations from Yunnan and Vietnam, which could be responsible for lower levels of genetic diversity
in these populations. Measures of genetic differentiation (F
ST = 0.269) indicated strong differentiation among wild litchi populations. Significant correlation was found between genetic
differentiation and geographical distance (r = 0.655, P = 0.002), indicating a strong isolation by distance in these populations. Bayesian clustering suggested genetic separation
among three regional groups, namely, the western group, the central group and the eastern group. Some conservation strategies
for wild litchi populations were also proposed based on our results. 相似文献
13.
Otto Monge Kari Schmidt Christopher Vaughan Gustavo Gutiérrez-Espeleta 《Conservation Genetics》2016,17(3):745-750
Once widely distributed throughout the lowland forests of Costa Rica, scarlet macaws (Ara macao) have been reduced to two major, geographically separated, populations along the Pacific slope. Past demographic declines raise conservation concerns regarding the detrimental effects of population fragmentation. This investigation aimed to evaluate the current status of scarlet macaws along the Pacific slope by examining levels of genetic variation and patterns of genetic structure within and among remnant populations. Statistical analyses using multilocus genotypes revealed strong differentiation between Central and South Pacific populations, suggesting local geographic barriers have historically restricted gene flow between these localities. High genetic diversity suggests neither population suffers from genetic erosion, likely resulting from relatively large population sizes and high dispersal capacity and longevity. However, evidence of disequilibrium within the Central Pacific population infers anthropogenic threats have disrupted natural population dynamics. These results advocate on focusing available resources on habitat restoration and nest protection, as a means to assist in reestablishing demographic stability and maintain the genetic health of wild scarlet macaws in Costa Rica. 相似文献
14.
Shuhei Matsuyama Miki Morimoto Tsuyoshi Harata Satoshi Nanami Akira Itoh 《Conservation Genetics》2018,19(1):181-191
Hybridization between the introduced and native plants may enhance invasiveness, especially in asexually reproducing species. Hybrid apomictic dandelions between native (Taraxacum platycarpum and T. japonicum) and exotic (T. officinale) species are distributed widely throughout Japan. To estimate the origin(s) and dispersal of the hybrids, we investigated the hybridization rate and genotypic diversity in mixed populations of T. japonicum, T. officinale and their hybrids at two green parks in western Japan. Among the plants identified as exotics from flower morphology, 86–96% were hybrids by genetic analysis. Genetic data with simple sequence repeat markers revealed a high clonal diversity of the hybrid both within and between populations, indicating multiple origins. A hybrid seed was found from among the 1891 seeds collected from T. japonicum in the parks, indicating ongoing hybridization in the field. T. officinale and hybrids were genetically differentiated between the two parks independent of the ploidy level; the allele frequency of T. officinale and tri- and tetraploid hybrids were similar within each park but different between the two parks. This suggests that the origins of hybrids were similar within the park but different between the parks. Overall, our results suggest that hybridization, including backcross, is an ongoing process, and that genetically diverse hybrids with various origins have been spreading in western Japan, probably because hybridization enhanced invasiveness at native habitat. 相似文献
15.
Yuji Isagi Ryunosuke Tateno Yu Matsuki Akira Hirao Sonoko Watanabe Mitsue Shibata 《Ecological Research》2007,22(3):382-389
In order to evaluate the consequences of forest fragmentation on populations of Magnolia obovata, we compared genetic diversity and reproductive characteristics at two nearby sites, one conserved and one fragmented. The
genetic diversity between adults trees of the different sites was not significantly different. However, saplings in the conserved
site showed a significantly higher genetic diversity than both adult trees in the conserved site and saplings in the fragmented
sites; this was found to be the result of the larger gene flow into the conserved site. The density of the adult trees was
significantly related to all of the reproductive traits analyzed (fertilization of ovules, insect attack to seeds, ovules
that developed into seeds and outcrossing at the stage of seeds) at both sites. At both sites, fertilization of ovules and
insect attack on seeds were positively correlated to adult tree density while outcrossing rate was negatively correlated to
adult tree density. The fertilization of ovules and outcrossing were more dependent on adult tree density in the fragmented
site than in the conserved site. The probability of ovules developing into outcrossed seeds showed a negative correlation
with adult tree density at both sites, indicating the advantage of low density for this species and possibly implying a resilience
to habitat fragmentation. A two-generation-analysis did not identify significant differences between sites in terms of the
structure of the pollen pool and the number of pollen donors. Although fragmentation affected reproductive characteristics,
the effect on seedling establishment and subsequent survival remains to be determined. Proposals for future studies that will
assist in the development of management strategies for forests suffering fragmentation are made. 相似文献
16.
Allelopathy has been considered a key mechanism to explain the invasiveness of some species. It is well known that invasive plants can affect native plants by producing novel allelochemicals but some exotic plant species may be also sensitive to allelochemicals released by native species, providing a tool to reduce growth and impacts of invasive exotic species. Here, using growth chamber experiments we tested the mutual potential allelopathic effects of Sesbania virgata (a native dominant species) and the alien Leucaena leucocephala seeds. S. virgata was unaffected by seed leachates of L. leucocephala, indicating that, under lab conditions, this legume presents resistance to the phytotoxic compounds produced by seeds of this alien species. In contrast, germination and seedling growth of L. leucocephala were strongly affected by the phytochemicals produced by seeds of S. virgata. A delay in endospermic mobilization of storage carbohydrates (raffinose-family oligosaccharides and galactomannan) was observed in the alien species. These potential allelopathic effects could not be attributed sole to the presence neither of the phytoxic catechin nor of ABA in seed leachates of S. virgata. Our findings indicate that the in vitro behavior of S. virgata is consistent with its aggressiveness in natural environment and suggest sesbanimide as a potential candidate as implicated in the noxious effects of S. virgata on the alien species. 相似文献
17.
Jos Barlow Ivanei S. Araujo William L. Overal Toby A. Gardner Fernanda da Silva Mendes Iain R. Lake Carlos A. Peres 《Biodiversity and Conservation》2008,17(5):1089-1104
Production landscapes are rarely considered as priority areas for biodiversity conservation in the tropics. Tree plantations
have the potential to provide a conservation service in much of the humid tropics since they are rapidly increasing in extent
and present less of a structural contrast with native vegetation than many more intensive agricultural land-uses. We used
hierarchical partitioning to examine the factors that influence the value of large-scale Eucalyptus plantations for tropical fruit-feeding butterflies (Lepidoptera: Nymphalidae) in the Brazilian Amazon. We focused on evaluating
the importance of landscape versus stand-level factors in determining the diversity and composition of butterfly assemblages,
and how butterfly-environment relationships vary within and between subfamilies of Nymphalidae. Native understorey vegetation
richness had the strongest independent effect on the richness, abundance and composition of all fruit-feeding butterflies,
as well as a subset of species that had been recorded in nearby primary forests. However, overall patterns were strongly influenced
by the most abundant subfamily (Satyrinae), and vegetation richness was not related to the abundance of any other subfamily,
or non-Satyrinae species, highlighting the importance of disaggregating the fruit-feeding Nymphalidae when examining butterfly-environment
relationships. Our results suggest that plantations can help conserve a limited number of forest species, and serve to highlight
the research that is necessary to understand better the relationship between fruit-feeding butterflies and environmental variables
that are amenable to management. 相似文献
18.
The historical contingencies of biological invasions may have important consequences for final invasion outcomes. Here, we characterize the variations in the realized niche during the invasions of the bull-headed dung beetle Onthophagus taurus (Coleoptera: Scarabaeidae) from its native Mediterranean range following accidental (Eastern North America) as well as deliberate (Western North America, Western Australia, and Eastern Australia) releases into novel, exotic ranges approximately 50 years ago. Specifically, we examined whether the climatic responses of exotic O. taurus have diverged from those characterizing their native range, and if so, to what degree and in what dimensions. We found that when compared to the native range, all exotic populations exhibited similar overlap proportions regardless of invasion history. However, more detailed analysis of climatic niche features showed that all three deliberately established populations were characterized by overall similar climatic niche features, whereas the accidentally-established Eastern North American populations have undergone significant changes in their climatic niche. Specifically, when analog climates were considered on the background of each pairwise range comparison, accidentally-established Eastern North American populations showed a different climatic niche expansion than their deliberately introduced Australian or Western North American counterparts, in particular towards colder and more humid climates. We discuss our results in the context of the widely divergent introduction histories of O. taurus in Australia and North America, and highlight the possible roles of contrasting propagule sizes, disparate genetic profiles and variances, adaptive processes and invadable landscapes in shaping invasion outcomes in the different exotic ranges. 相似文献
19.
Genetic variation and clonal diversity of nine populations of Bromus ircutensis Kom. from the Otingdag sandy land were investigated using Inter Simple Sequence Repeat (ISSR) markers. A total of 102 bands were amplified by using 11 ISSR primers chosen for the study. Among those 99% were polymorphic indicating high level of genetic variation at the species
level with a mean genetic diversity (H) of 0.292 and Shannon information index (I) of 0.450. Percentage of polymorphic loci (PPL) of nine populations was 76.48% on average, which provides more evidence of considerable genetic variation at the population
level. AMOVA analysis revealed that total genetic variation was higher within populations (87.06%) than between populations (12.94%),
which is mainly the result of the extensive gene flow (Nm = 1.682) among B. ircutensis populations. UPGMA cluster analysis divided the nine populations into two groups. There was significant or moderate negative correlations between
genetic diversity parameters (PPL, H, I) and longitude or latitude. Mantel test also showed a significant correlation between geographical distance and genetic distance
(r = 0.681, p = 0.002). Our findings indicated that distribution of B. ircutensis populations was influenced by geographical and ecological factors. Clonal diversity was also high with 108 individuals identified
by 11 ISSR primers being all of different genets. Our results provide a molecular basis for sustainable management and conservation
of B. ircutensis in the study area. 相似文献
20.
Ryohei Nakao Yuka Iguchi Naoto Koyama Koji Nakai Tadao Kitagawa 《Ichthyological Research》2017,64(1):116-119
We revealed the range and current status of genetic disturbances in wild medaka populations (Oryzias latipes species complex) using two DNA markers (cytb gene and b-marker). Genetic disturbances were detected in many wild populations throughout Japan and were primarily caused by artificial introduction of the commercial medaka variety, himedaka. We identified native medaka populations without introgressions, which may be significant conservation targets. To conserve the native genetic diversity of the medaka species complex, further introduction of himedaka should be prevented by educating the public about the current status and risks of introducing non-native medaka varieties into the wild. 相似文献