共查询到20条相似文献,搜索用时 375 毫秒
1.
Takahiko Mukai Shozo Nakamura Toshiyuki Suzuki Mutsumi Nishida 《Ichthyological Research》2005,52(4):410-413
To investigate the genetic differentiation between the Bonin (Ogasawara) Islands' freshwater goby Rhinogobius sp. Bonin Island (BI) form (Ogasawara-yoshinobori) and the Japan–Ryukyu Archipelago relatives, the mitochondrial DNA (mtDNA)
phylogeny of Japanese Rhinogobius species was inferred from partial nucleotide sequences of the mitochondrial NADH dehydrogenase 5 subunit (ND5) gene (945 bp).
The resultant tree showed that the Bonin Islands group separated first from the other Japanese lineage, and a test calculation
indicated the divergence date to be approximately 3 million years BP. Although it is necessary to use a more reliable estimate
to confirm the divergence date, Rhinogobius sp. BI has retained its mtDNA lineage in the islands for millions of years. 相似文献
2.
Guillermo Velo-Antón Mario García-París Adolfo Cordero Rivera 《Conservation Genetics》2008,9(5):1263-1274
The European pond turtle (Emys orbicularis) is threatened and in decline in several regions of its natural range, due to habitat loss combined with population fragmentation.
In this work, we have focused our efforts on studying the genetic diversity and structure of Iberian populations with a fine-scale
sampling (254 turtles in 10 populations) and a representation from North Africa and Balearic island populations. Using both
nuclear and mitochondrial markers (seven microsatellites, ∼1048 bp nDNA and ∼1500 bp mtDNA) we have carried out phylogenetic
and demographic analyses. Our results show low values of genetic diversity at the mitochondrial level although our microsatellite
dataset revealed relatively high levels of genetic variability with a latitudinal genetic trend decreasing from southern to
northern populations. A moderate degree of genetic differentiation was estimated for Iberian populations (genetic distances,
F
ST
values and clusters in the Bayesian analysis). The results in this study combining mtDNA and nDNA, provide the most comprehensive
population genetic data for E. orbicularis in the Iberian Peninsula. Our results suggest that Iberian populations within the Iberian–Moroccan lineage should be considered
as a single subspecies with five management units, and emphasize the importance of habitat management rather than population
reinforcement (i.e. captive breeding and reintroduction) in this long-lived species. 相似文献
3.
Sequence variation of the 5′ end of the mitochondrial DNA control region (600 bp) was examined in the population samples of
Eurasian wigeon Anas penelope from Anadyr’ and Primorye. A total of 11 different mtDNA haplotypes were identified, with one of these belonging to American
wigeon Anas americana. The presence of the mtDNA haplotype from the species closely relative to A. penelope in the Anadyr’ sample can be considered as the genetic evidence in favor of interspecific hybridization. This suggestion
is in the good agreement with ornithological data. Genetic differentiation of the Primorye and Anadyr’ populations was low
(Φst = 0.096). The phylogeographic structure was not pronounced. 相似文献
4.
A. A. Echelle J. C. Hackler J. B. Lack S. R. Ballard J. Roman S. F. Fox D. M. LeslieJr. R. A. Van Den Bussche 《Conservation Genetics》2010,11(4):1375-1387
A previous mtDNA study indicated that female-mediated gene flow was extremely rare among alligator snapping turtle populations
in different drainages of the Gulf of Mexico. In this study, we used variation at seven microsatellite DNA loci to assess
the possibility of male-mediated gene flow, we augmented the mtDNA survey with additional sampling of the large Mississippi
River System, and we evaluated the hypothesis that the consistently low within-population mtDNA diversity reflects past population
bottlenecks. The results show that dispersal between drainages of the Gulf of Mexico is rare (F
STmsat
= 0.43, ΦSTmtDNA = 0.98). Past range-wide bottlenecks are indicated by several genetic signals, including low diversity for microsatellites
(1.1–3.9 alleles/locus; H
e = 0.06–0.53) and mtDNA (h = 0.00 for most drainages; π = 0.000–0.001). Microsatellite data reinforce the conclusion from mtDNA that the Suwannee River population might eventually
be recognized as a distinct taxonomic unit. It was the only population showing fixation or near fixation for otherwise rare
microsatellite alleles. Six evolutionarily significant units are recommended on the basis of reciprocal mtDNA monophyly and
high levels of microsatellite DNA divergence. 相似文献
5.
Shoichiro Yamamoto Kentaro Morita Takeshi Kikko Kouichi Kawamura Shunpei Sato Jin-Chywan Gwo 《Freshwater Biology》2020,65(4):698-715
- Climate oscillations during the Pleistocene had profound effects on the evolutionary history of freshwater fishes now distributed across northern temperate regions. The extent of continental glaciation on the western side of the North Pacific, including areas of East Asia, was more limited as compared with regions of North America, Europe and high-latitude areas of the North Pacific. Therefore, the effects of climate oscillations might have influenced species in dissimilar ways depending on the species' distribution.
- We used mitochondrial DNA (mtDNA) and microsatellite DNA (msDNA) markers to clarify the evolutionary history of masu salmon Oncorhynchus masou subspecies-complex (family Salmonidae) distributed in historically non-glaciated regions in the western North Pacific.
- No marked regional or subspecies-specific mtDNA haplotype associations were recognised, except for O. masou subsp., a lacustrine form endemic to Lake Biwa, an ancient lake in central Honshu. The landlocked subspecies O. masou formosanus, with a disjunct distribution on Taiwan Island, exhibited no diagnostic population features differing from the other subspecies, in either mtDNA or msDNA markers. Mismatch distribution and Bayesian skyline plot analyses indicated relatively recent range expansion and rapid population growth for masu salmon during the last glacial period (c. 0.1–0.15 Ma).
- Contrary to the mtDNA genealogy, Bayesian clustering using msDNA showed two main genetic clusters, mainly northern populations of the subspecies O. m. masou and populations of the subspecies O. m. ishikawae in southern areas of the Japanese Archipelago. Notably, O. m. formosanus on Taiwan Island was included in the O. m. masou group, and O. masou subsp. was included in the O. m. ishikawae group.
- Our results suggest that the masu salmon subspecies-complex in historically non-glaciated regions of the Temperate Northern Pacific is characterised by weak population structuring and shallow genetic differentiation among the subspecies, except for O. masou subsp. owing to its long isolation in Lake Biwa. Incomplete lineage sorting and historical inter-subspecies hybridisation, possibly due to secondary contact, seem to be plausible explanations for discrepancies in the mitochondrial DNA genealogy and nuclear DNA genetic structure.
6.
Alicia M. Bray Leah S. Bauer Therese M. Poland Robert A. Haack Anthony I. Cognato James J. Smith 《Biological invasions》2011,13(12):2869-2887
Emerald ash borer (EAB), Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), is an invasive pest of North American ash (Fraxinus spp.) trees first discovered outside of its native range of northeastern Asia in 2002. EAB spread from its initial zone of
discovery in the Detroit, Michigan and Windsor, Ontario metropolitan areas, in large part, from inadvertent human-assisted
movement of infested ash materials. EAB infestations are now known in 15 US states and two Canadian provinces. The primary
goal of this study was to use molecular markers to characterize the population genetic structure of EAB in its native and
introduced range. This information may provide valuable insights on the geographic origin, potential host range, invasion
potential, and additional biological control agents for ongoing management efforts of this destructive wood-boring beetle.
EAB were collected from 17 localities in its native Asian range and from 7 localities in North America, and population structure
analyzed using mtDNA gene sequences, AFLP fingerprints, and alleles at 2 microsatellite loci. Analysis of mtDNA cytochrome
oxidase subunit I gene (COI; 439 bp) sequences revealed all North American individuals carry a common mtDNA haplotype also
found in China and South Korea. Additional mtDNA haplotypes observed in China and South Korea differed from the common haplotype
by 1–2 nucleotide substitutions and a single individual from Japan differed by 21 nucleotide changes (4.8%). Analysis using
AFLP fingerprints (108 loci) indicated Asian populations were more highly variable, yet had less overall population structure,
than the North American populations. North American populations appear most closely related to populations in our sample from
the Chinese provinces of Hebei and Tianjin City. Further, population assignment tests assigned 88% of the individual beetles
from North America to either Hebei or Tianjin City. 相似文献
7.
To offset declines in commercial landings of the softshell clam, Mya
arenaria, resource managers are engaged in extensive stocking of seed clams throughout its range in the northwest Atlantic. Because
a mixture of native and introduced stocks can disrupt locally adapted genotypes, we investigated genetic structure in M.
arenaria populations across its current distribution to test for patterns of regional differentiation. We sequenced mitochondrial
cytochrome oxidase I for a total of 212 individuals from 12 sites in the northwest Atlantic (NW Atlantic), as well as two
introduced sites, the northeast Pacific (NE Pacific), and the North Sea Europe (NS Europe). Populations exhibited extremely
low genetic variation, with one haplotype dominating (65–100%) at all sites sampled. Despite being introduced in the last
150–400 years, both NE Pacific and NS Europe populations had higher diversity measures than those in the NW Atlantic and both
contained private haplotypes at frequencies of 10–27% consistent with their geographic isolation. While significant genetic
structure (F
ST = 0.159, P < 0.001) was observed between NW Atlantic and NS Europe, there was no evidence for genetic structure across the pronounced
environmental clines of the NW Atlantic. Reduced genetic diversity in mtDNA combined with previous studies reporting reduced
genetic diversity in nuclear markers strongly suggests a recent population expansion in the NW Atlantic, a pattern that may
result from the retreat of ice sheets during Pleistocene glacial periods. Lack of genetic diversity and regional genetic differentiation
suggests that present management strategies for the commercially important softshell clam are unlikely to have a significant
impact on the regional distribution of genetic variation, although the possibility of disrupting locally adapted stocks cannot
be excluded. 相似文献
8.
Barbara Hefti-Gautschi Monika Pfunder Lukas Jenni Verena Keller Hans Ellegren 《Conservation Genetics》2009,10(1):87-99
The conservation status of small breeding areas of the Goosander (Mergus merganser merganser) in Central Europe is unclear. Geographic isolation of these areas suggests restricted gene flow to and from large North-European
populations. On the other hand, migrating Goosanders from northern Europe join the Central European breeding population for
wintering. To evaluate the conservation status of the small breeding areas we assessed the genetic structure of M. merganser populations in Europe by examining two nuclear marker systems (microsatellites and Single Nucleotide Polymorphisms, SNP)
and mitochondrial (mtDNA) control region sequence variation for Goosanders in 11 sampling areas representing three of five
distinct breeding areas and two subspecies (M. m. merganser and M. m. americanus). Overall population differentiation estimates including both subspecies were high, both based on mtDNA () and nuclear markers (θ
ST = 0.219; 95% CI 0.088–0.398, SNP and microsatellites combined). Within Europe, mtDNA revealed a strong overall () and significant pairwise population differentiation between almost all comparisons. In contrast, both nuclear marker systems
combined revealed only a small overall genetic differentiation (θ
ST = 0.022; 95% CI 0.003–0.041). The strong genetic differentiation based on female-inherited mtDNA but not on biparentally
inherited nuclear markers can be explained by sex-biased dispersal and strong female philopatry. Therefore, small breeding
areas in Europe are endangered despite large male-mediated gene-flow, because when these populations decline, only males—but
due to strong philopatry not females—can be efficiently supplemented by migration from the large North European populations.
We therefore propose to manage the small breeding areas independently and to strengthen conservation efforts for this species
in Central Europe. 相似文献
9.
E. Banguera-Hinestroza A. Bjørge R. J. Reid P. Jepson A. R. Hoelzel 《Conservation Genetics》2010,11(5):1823-1836
In this paper we use mitochondrial and microsatellite DNA variation to investigate the mechanisms that underlie the evolution
of population structure in a highly mobile marine mammal, the white-beaked dolphin. We found moderate genetic diversity (h) at mtDNA, but low nucleotide diversity (π) (0.7320 ± 0.0031 and 0.0056 ± 0.0004, respectively), consistent with expectations
for a recent expansion. Analyses based on mismatch distributions further suggested a demographic expansion in the Norwegian-Barents
Sea population and a spatial expansion in the British isles-North Sea population, implying distinct demographic histories.
F
ST values showed clear differentiation among these two populations, but no difference was found between putative populations
separated by the English Channel. Our data suggest a stepwise pattern of expansion, dependent on available coastal habitat.
The conservation implications are a need to protect local populations isolated by an expanse of deep water, and in particular,
a population along the British coasts and in the North Sea as separate from the North Norway-Barents Sea population. It is
also evident that overall diversity was reduced, probably during the last glacial epoch. 相似文献
10.
Since 1985, China has established three breeding herds of Père David’s deer: the Beijing Père David’s Deer Park (39°07′N,
116°03′E), the Dafeng Père David’s Deer Nature Reserve (33°05′N, 120°49′E) and Shishou (Tianezhou) Père David’s Deer Nature
Reserve (29°49′N, 112°33′E), through reintroductions of about 30–40 founders. Since establishment, all three populations have
grown steadily. However, genetic backgrounds in those populations are still unknown. We studied the genetic diversity in Père
David’s deer and genetic consequences of population relocations in China. We revealed that genetic diversity was extremely
low in Père David’s deer populations in China. Only a single mtDNA D-loop haplotype was found in the deer, furthermore, only
five polymorphic microsatellite loci were screened out from 84 pairs of species-transferred primers. Genetic makeup in the
three Père David’s deer populations were significantly different (P < 0.01). H
E and allelic richness in the Tianezhou population were the highest (0.54, 2.60, n = 31), Beijing population (0.52, 2.4, n = 125) showed the second highest measures, while the Dafeng population (0.46, 2.39, n = 39) measured lowest. Our results suggest that effective management of a species of low genetic diversity like the Père
David’s deer should consider the genetic background of each founder to make sure genetic variations are preserved in both
source population and relocated population. Now, the Tianezhou population is the most appropriate source population in China
when establishing new Père David deer populations in the wild.
相似文献
Zhigang JiangEmail: |
11.
The complete mitochondrial genome (mtDNA) of snow leopard Panthera uncia was obtained by using the polymerase chain reaction (PCR) technique based on the PCR fragments of 30 primers we designed.
The entire mtDNA sequence was 16 773 base pairs (bp) in length, and the base composition was: A—5,357 bp (31.9%); C—4,444 bp
(26.5%); G—2,428 bp (14.5%); T—4,544 bp (27.1%). The structural characteristics [0] of the P. uncia mitochondrial genome were highly similar to these of Felis catus, Acinonyx jubatus, Neofelis nebulosa and other mammals. However, we found several distinctive features of the mitochondrial genome of Panthera unica. First, the termination codon of COIII was TAA, which differed from those of F. catus, A. jubatus and N. nebulosa. Second, tRNASer
(AGY), which lacked the ‘‘DHU’’ arm, could not be folded into the typical cloverleaf-shaped structure. Third, in the control region,
a long repetitive sequence in RS-2 (32 bp) region was found with 2 repeats while one short repetitive segment (9 bp) was found
with 15 repeats in the RS-3 region. We performed phylogenetic analysis based on a 3 816 bp concatenated sequence of 12S rRNA,
16S rRNA, ND2, ND4, ND5, Cyt b and ATP8 for P. uncia and other related species, the result indicated that P. uncia and P. leo were the sister species, which was different from the previous findings. 相似文献
12.
Intraspecific phylogenies can provide useful insights into how populations have been shaped by historical and contemporary
processes. To determine the population genetic structure and the demographic and colonization history of Cleisthenes herzensteini in the Northwestern Pacific, one hundred and twenty-one individuals were sampled from six localities along the coastal regions
of Japan and the Yellow Sea of China. Mitochondrial DNA variation was analyzed using DNA sequence data from the 5′ end of
control region. High levels of haplotype diversity (>0.96) were found for all populations, indicating a high level of genetic
diversity. No pattern of isolation by distance was detected among the population differentiation throughout the examined range.
Analyses of molecular variance (AMOVA) and the conventional population statistic Fst revealed no significant population genetic structure among populations. According to the exact test of differentiation
among populations, the null hypothesis that C. herzensteini within the examined range constituted a non-differential mtDNA gene pool was accepted. The demographic history of C. herzensteini was examined using neutrality test and mismatch distribution analyses and results indicated Pleistocene population expansion
(about 94–376 kya) in the species, which was consistent with the inference result of nested clade phylogeographical analysis
(NCPA) showing contiguous range expansion for C. herzensteini. The lack of phylogeographical structure for the species may reflect a recent range expansion after the glacial maximum and
insufficient time to attain migration-drift equilibrium. 相似文献
13.
We determined the complete mitochondrial genome sequences of two haplotypes of the smallmouth bass, Micropterus dolomieu; individuals used in the analysis were collected from nonindigenous populations in Japan. Both genomes comprised 16,488 bp,
with genome contents and gene orders being identical to those of other teleost fishes. A previous study revealed that the
Japanese smallmouth bass had only two haplotypes, and the present study revealed that the complete mitochondrial DNA (mtDNA)
sequences of the haplotypes differed in only one nucleotide difference. The low genetic diversity in the mtDNA of the smallmouth
bass individuals in our study and the results of the mtDNA sequence comparison between the Japanese and the North American
individuals suggested that the fish had been transplanted from a fish farm with a low-diversity stock. 相似文献
14.
Vítor Sousa Filipa Penha Maria J. Collares-Pereira Lounès Chikhi Maria M. Coelho 《Conservation Genetics》2008,9(4):791-805
The endemic and critically endangered cyprinid Chondrostoma lusitanicum has a very restricted distribution range. In order to estimate genetic diversity, characterize population structure and infer
the demographic history, we examined six microsatellite loci and cytochrome b (mtDNA) sequences from samples taken throughout C. lusitanicum’s geographical range. Estimates of genetic diversity were low in all samples (average He < 0.35). The microsatellite data
pointed to a major difference between northern (Samarra and Tejo drainages) and southern (Sado and Sines drainages) samples.
This separation was not so clear with mtDNA, since one sample from the Tejo drainage grouped with the southern samples. This
could be related with ancestral polymorphism or with admixture events between northern and southern sites during the late
Pleistocene. Nevertheless, both markers indicate high levels of population differentiation in the north (for microsatellites
F
ST > 0.23; and for mtDNA ΦST > 0.74) and lower levels in the south (F
ST < 0.05; ΦST < 0.40). With microsatellites we detected strong signals of a recent population decrease in effective size, by more than
one order of magnitude, starting in the last centuries. This is consistent with field observations reporting a severe anthropogenic-driven
population decline in the last decades. On the contrary mtDNA suggested a much older expansion. Overall, these results suggest
that the distribution of genetic diversity in C. lusitanicum is the result of both ancient events related with drainage system formation, and recent human activities. The potential effect
of population substructure generating genetic patterns similar to a population decrease is discussed, as well as the implications
of these results for the conservation of C. lusitanicum.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
15.
We evaluate the hypothesis of no geographic structure in the Huchen (Hucho hucho), a large, predatory salmonid endemic to the Danube basin. Forty-seven individuals sampled from throughout the Huchen’s native
range were genetically characterized. Extremely limited sequence diversity across 1,800 bases of mtDNA (the complete control
region and partial NADH-1 subunit) evidenced by four closely related mtDNA haplotypes was found. Nonetheless, the geographic
distribution of mtDNA repeats (5–10, 82-bp long copies per individual) as well as allelic diversity across two microsatellite
loci indicated large-scale geographic structure between the north-western (Austria and Slovenia) distribution area and eastern
(Slovakia and Ukraine) or southern (Bosnia-Herzegovina and Montenegro) sample sites. An extremely slow rate of substitution
for the H. hucho mtDNA is considered along with the alternative hypotheses to explain the limited mtDNA diversity. Considering the regional
genetic structure implied by our data, we advocate restrictions on the transport of brood fish or yearlings across the range
of the species distribution and sale of Huchen across international boundaries. Future genetic analysis to support local conservation
and monitoring efforts must focus on developing a high-resolution screen that may be applied to identify hatchery versus naturally
reproduced individuals in the wild. 相似文献
16.
Koji Tominaga Katsutoshi Watanabe Ryo Kakioka Seiichi Mori Sang-Rin Jeon 《Ichthyological Research》2009,56(2):195-199
To elucidate the genetic population structure of Pseudogobio esocinus (Cyprinidae) in central Honshu, Japan, we performed phylogeographic analysis based on partial mitochondrial cytochrome b gene sequences. We found not only differentiation of mtDNA lineages between basins (uncorrected p ≈ 2%), presumably associated with uplifting of the Suzuka Mountains in the early Pleistocene, but also more diverged two
mtDNA lineages within basins (p ≈ 8%). No evidence of mtDNA introgression from related sympatric species was found. The phylogeographic history of these
two lineages should be elucidated by further analysis based on the specimens of P. esocinus from the entire distribution range. 相似文献
17.
Haruko Ando Hiroko Ogawa Shingo Kaneko Hajime Takano Shin‐Ichi Seki Hajime Suzuki Kazuo Horikoshi Yuji Isagi 《Ibis》2014,156(1):153-164
The Red‐headed Wood Pigeon Columba janthina nitens is endemic to the Ogasawara Islands, an oceanic island chain located 1000 km south of the main islands of Japan. The subspecies is at high risk of extinction because of its small population size and restricted habitat range. We undertook genetic analyses of this pigeon using sequences of a portion of the mitochondrial control region and five microsatellite markers to estimate the genetic characteristics of two wild populations from the Bonin and Volcano Islands, as well as one captive breeding population. The genetic diversity of the wild individuals was exceptionally low in both the mitochondria (nucleotide diversity = 0.00105) and at the microsatellite (3.2 alleles per locus and HE = 0.12) loci. Higher numbers of microsatellite genotypes were observed in the Volcano Islands population than in the Bonin Islands population, which may be because of the relatively low impact of human disturbance. The most common mitochondrial haplotypes and microsatellite alleles observed in the two wild populations were completely fixed in the captive population. Our results suggest that the genetic diversity of the captive population needs to be increased. However, introduction of a wild individual into a captive population can lead to a decreased genetic diversity in the wild population and therefore should be done with caution. The genetic differentiation between the Bonin and the Volcano island groups was low, and the populations of the two island groups should be regarded as a single evolutionarily significant unit. However, special consideration is required for habitat conservation in the Volcano Islands, which may be functioning as a sanctuary for the Red‐headed Wood Pigeon. For the long‐term conservation of threatened bird species that live on remote oceanic islands, determination of management units considering gene flow caused by their flying capacity and maintenance of genetically suitable wild and captive populations are essential. 相似文献
18.
Pacific halibut collected in the Aleutian Islands, Bering Sea and Gulf of Alaska were used to test the hypothesis of genetic
panmixia for this species in Alaskan marine waters. Nine microsatellite loci and sequence data from the mitochondrial (mtDNA)
control region were analyzed. Eighteen unique mtDNA haplotypes were found with no evidence of geographic population structure.
Using nine microsatellite loci, significant heterogeneity was detected between Aleutian Island Pacific halibut and fish from
the other two regions (F
ST range = 0.007–0.008). Significant F
ST values represent the first genetic evidence of divergent groups of halibut in the central and western Aleutian Archipelago.
No significant genetic differences were found between Pacific halibut in the Gulf of Alaska and the Bering Sea leading to
questions about factors contributing to separation of Aleutian halibut. Previous studies have reported Aleutian oceanographic
conditions at deep inter-island passes leading to ecological discontinuity and unique community structure east and west of
Aleutian passes. Aleutian Pacific halibut genetic structure may result from oceanographic transport mechanisms acting as partial
barriers to gene flow with fish from other Alaskan waters. 相似文献
19.
Pramual P Gomontean B Buasay V Srikhamwiang N Suebkar P Niamlek C Donsinphoem Y Chalat-Chieo K 《Genetica》2009,135(1):51-57
The objectives of this study were to explore cytogenetic variation and the role of chromosomal change on local adaptation
and genetic differentiation of Chironomus circumdatus Kieffer from Thailand. A total of 1,505 larvae from 24 populations were examined cytologically. Twelve chromosomal inversions
were found and most of these (9 of 12) were rare inversions. All populations were in Hardy–Weinberg equilibrium. Significant
association (P < 0.001) between the A2 and B5 inversions was detected in one population. Population genetic structure analysis indicated significant genetic differentiation
between populations (F
ST = 0.037, P < 0.001). Geographic distance was the principal factor limiting gene flow between populations. Nei’s modified genetic distance
(D
A) between populations ranged from 0.001 to 0.011 with an average of 0.003. An UPGMA population phenogram depicting relationship
between populations based on D
A values revealed three groups of populations, group I, II and III each characterized by different inversions/inversion frequencies.
Significant correlation of inversion C3 and water temperature suggested that this inversion might have a role to play on adaptation to high temperature habitat.
However, if detection of significant population subdivision and relationship between genetic and geographic distance are taken
into account, relationship between C3 and water temperature will also be due to the effect of migration/drift alone without the effect of selection. 相似文献
20.
Matt J. Rayner Colm J. F. Carraher Mick N. Clout Mark E. Hauber 《Conservation Genetics》2010,11(5):2073-2077
The endangered Cook’s petrel (Pterodroma cookii) is restricted to two separated populations at the extremes of its former range across New Zealand. Prior work revealed morphological,
foraging, and reproductive isolation between these two remnant populations. To aid the conservation management of the species,
additional information is required on the genetic structure of Cook’s petrel. We used mitochondrial DNA sequences (Cytochrome
Oxidase subunit 1 gene), collected from 26 and 19 Cook’s petrel breeding on Little Barrier Island (LBI) and Codfish Island
(CDF), respectively, for this preliminary study. We uncovered distinct population genetic structure with analysis of molecular
variance suggesting genetic isolation of the populations. Levels of genetic variation were higher in the LBI population (four
haplotypes present; h = 0.34 and π = 0.10) whereas the CDF population had only one haplotype that was distinct from the LBI population. Our results indicate
that Cook’s petrel constitute two distinct management units for which conservation of genetic as well as behavioural and morphological
diversity should be a priority. Further genetic studies using nuclear markers are recommended. 相似文献