Genetic divergence among populations of Pissodes yunnanensis (Coleoptera: Curculionidae) in southwestern China

2007 ◽  
Vol 139 (3) ◽  
pp. 308-318 ◽  
Author(s):  
Hongrui Zhang ◽  
David W. Langor ◽  
Hui Ye ◽  
Zhengyue Li ◽  
Richard D. Laffin
Keyword(s):  
Gene Flow ◽  
Phylogenetic Analyses ◽  
Flow Analysis ◽  
Species Group ◽  
Coi Gene ◽  
Southwestern China ◽  
Restricted Gene Flow ◽  
Northwestern Part ◽  
Genetic Structuring ◽  
Important Pest

AbstractThe bark weevil, Pissodes yunnanensis Langor and Zhang, is an important pest of young Yunnan pine, Pinus yunnanensis Franchet (Pinaceae), in southwestern China. Populations of the host and weevil are disjunct, especially in the northwestern part of the range in Yunnan province. To estimate maternal gene flow and examine the genetic structure of Pissodes yunnanensis, we sequenced an 840-bp fragment of the mitochondrial cytochrome c oxidase I (COI) gene in 60 individuals from 7 populations in Yunnan and Guizhou provinces. Percent divergence among populations ranged from 0.001% to 2.1%. Nested clade analysis of 21 haplo types showed evidence of genetic structuring that is inferred to be primarily due to allopatric fragmentation and a low level of gene flow. Analysis of molecular variance also showed significant genetic structuring and restricted gene flow among weevil populations, especially between northwestern and eastern regions of the range. Such genetic structuring may be important for pest management programs. Phylogenetic analyses comparing the same 761-bp sequence among P. yunnanensis, Pissodes punctatus Langor and Zhang from southwestern China, and five Nearctic species of Pissodes showed that (i) the two Chinese species were most closely related to each other, (ii) the four species in the P. strobi (Peck) species group formed a distinct clade, and (iii) these two clades were more similar to each other than to the Nearctic species P. affinis Randall.

Cyana barbora, a new species from Sichuan, southwestern China (Lepidoptera, Erebidae, Arctiinae, Lithosiini)

Zootaxa ◽  
2020 ◽  
Vol 4885 (4) ◽  
pp. 596-599
Author(s):  
ANTON V. VOLYNKIN ◽  
AIDAS SALDAITIS
Keyword(s):  
New Species ◽  
Mainland China ◽  
Species Group ◽  
Sichuan Province ◽  
Southwestern China ◽  
Valid Species ◽  
Northwestern Part ◽  
A New Species

The Cyana dohertyi (Elwes, 1890) species-group was erected by Volynkin et al. (2017) and characterized in details by Volynkin et al. (2019). The group is most diverse in mainland China and northern Indochina and comprises 16 valid species and two subspecies (Volynkin et al. 2019; Singh et al. 2020). During a lepidopterological expedition to the northwestern part of China’s Sichuan Province in June and July of 2019, a series of specimens of both sexes of an unidentified Cyana species was collected. The species is closely related to Cyana abiens Fang, 1992 known from the Chinese Shaanxi and Gansu Provinces. However, the specimens collected in Sichuan and C. abiens have conspicuous external and genital differences and the Sichuan population represents another species, which is described below as new. 

A new species of the genus Lethe Hübner, 1819 from Yunnan, China (Lepidoptera, Nymphalidae, Satyrinae)

Zootaxa ◽  
2019 ◽  
Vol 4700 (4) ◽  
pp. 464-470
Author(s):  
SI-YAO HUANG ◽  
MIN WANG ◽  
XIAO-LING FAN
Keyword(s):  
New Species ◽  
Male Genitalia ◽  
Yunnan Province ◽  
Species Group ◽  
Southwestern China ◽  
Northwestern Part ◽  
Wing Pattern ◽  
The Third ◽  
A New Species

A new species of the Lethe trimacula-group, viz. L. langsongyuni sp. nov. is described from Weixi County, representing the third member of this species group in northwestern part of Yunnan Province, southwestern China. In general L. langsongyuni sp. nov. is closely related to L. liae Huang, 2002, L. proxima Leech, 1892 and L. umedai albofasciata Huang, 2002, but it can be distinguished from all of them by combination of several details in wing pattern and male genitalia. The adults and male genitalia of the species aforementioned are illustrated. 

Do lowland habitats represent barriers to dispersal for a rainforest mayfly, Bungona narilla, in south-east Queensland?

2008 ◽  
Vol 59 (9) ◽  
pp. 761 ◽  
Author(s):  
Alison J. McLean ◽  
Daniel J. Schmidt ◽  
Jane M. Hughes
Keyword(s):  
Gene Flow ◽  
Aquatic Insect ◽  
Restricted Gene Flow ◽  
Long Distance Dispersal ◽  
Genetic Structuring ◽  
Long Distance ◽  
Heterogeneous Landscapes ◽  
Insect Populations ◽  
Dispersal Events ◽  
The Relationship

Long-distance dispersal might be an important mechanism for the maintenance of aquatic insect populations in heterogeneous landscapes. However, these events can be difficult to measure by direct observation because the techniques can be time-consuming, expensive and technically difficult. When dispersal results in gene flow within and between populations, patterns of variation can be detected by genetic methods. The levels of population genetic structuring and the relationship between gene flow and geographical distance were assessed in the mayfly species Bungona narilla (Harker, 1957) in rainforest streams in south-east Queensland that are separated by lowland habitats. An analysis of molecular variance based on mitochondrial DNA data, using a fragment of the cytochrome oxidase I gene, revealed significant differentiation between regions, suggesting that maternal gene flow was restricted. A nested clade analysis revealed patterns of historical (contiguous) range expansions and recent restricted gene flow along with some long-distance dispersal events. Our analyses have shown that populations of B. narilla are significantly structured throughout the species range in south-east Queensland and that the low elevation habitats separating the northern and southern populations are restricting gene flow to some extent.

Conservation implications of distinct genetic structuring in the endangered freshwater fish Nannoperca oxleyana (Percichthyidae)

2009 ◽  
Vol 60 (1) ◽  
pp. 34 ◽  
Author(s):  
James T. Knight ◽  
Catherine J. Nock ◽  
Martin S. Elphinstone ◽  
Peter R. Baverstock
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
Sand Dunes ◽  
Restricted Gene Flow ◽  
Genetic Structuring ◽  
Conservation Implications ◽  
South Wales ◽  
Haplotypic Diversity ◽  
Genetic Diversity And Structure ◽  
Fragmented Distribution

The maintenance of genetic diversity and gene flow in threatened species is a vital consideration for recovery programs. The endangered Oxleyan pygmy perch Nannoperca oxleyana has a fragmented distribution within coastal freshwater drainages of southern Queensland and northern New South Wales, Australia. In the present study, mitochondrial DNA control region variation was used to assess genetic diversity and structure across the geographical range of this species. Haplotypic diversity was highest in a small NSW subcatchment south of Evans Head (h = 0.594) followed by Marcus Creek in Queensland (h = 0.475). Distinct genetic differentiation was evident among the Queensland localities and the NSW subcatchments, implying restricted gene flow between coastal river systems. One of the nine haplotypes detected was distributed over 83.4% of the species’ range, suggesting historical connectivity among the now fragmented populations. These patterns were concordant with eustatic changes associated with the last glacial maximum. High barrier sand dunes may also act as barriers to gene flow and dispersal between adjacent NSW subcatchments. Conservation efforts should focus on the preservation of genetic diversity by maintaining as many genetically differentiated populations as possible. The relatively diverse populations inhabiting the South Evans Head subcatchment and Marcus Creek require special management consideration.

New species of Anillinus Casey (Carabidae: Trechinae: Bembidiini) from Great Smoky Mountains National Park, U.S.A. and phylogeography of the A. langdoni species group

Zootaxa ◽  
2007 ◽  
Vol 1542 (1) ◽  
pp. 1-20 ◽  
Author(s):  
IGOR M. SOKOLOV ◽  
YULIYA Y. SOKOLOVA ◽  
CHRISTOPHER E. CARLTON
Keyword(s):  
North Carolina ◽  
New Species ◽  
National Park ◽  
Phylogenetic Analyses ◽  
Species Group ◽  
Coi Gene ◽  
Great Smoky Mountains ◽  
Smoky Mountains ◽  
Habitat Corridors ◽  
The Impact

The Anillinus langdoni–species group is characterized and two new species are described, Anillinus cieglerae Sokolov and Carlton sp. nov. and A. pusillus Sokolov and Carlton sp. nov., both from Great Smoky Mountains National Park. The langdoni–group includes four species at present, three apparently endemic to the Great Smoky Mountains and adjacent mountains of western North Carolina/Tennessee, and a fourth from South Mountains of middle North Carolina. They are distinguished mainly using characters of the male genitalia and to a lesser extent, differences in shapes of female spermathecae. Phylogenetic analyses based on aedeagal morphology and COI gene sequences yielded conflicting results, with the later providing a phylogeny that was more parsimonious with expectations based on geographic distributions. Speciation within the group may derive from ecological constraints and altitudinal fluctuations of habitat corridors during past climate changes combined with the impact of local watersheds as fine scale isolating mechanisms.

Do we have different varieties in Acer velutinum (Sapindaceae): Morphological and molecular studies

Phytotaxa ◽  
2017 ◽  
Vol 321 (2) ◽  
pp. 151
Author(s):  
SEDIGHEH NIKZAT SIAHKOLAEE ◽  
MASOUD SHEIDAI ◽  
MOSTAFA ASSADI ◽  
ZAHRA NOORMOHAMMADI
Keyword(s):  
Image Analysis ◽  
Gene Flow ◽  
Phylogenetic Analyses ◽  
Leaf Shape ◽  
Morphological Variability ◽  
Flow Analysis ◽  
Intergenic Spacer ◽  
Population Genetic Study ◽  
Molecular Approaches ◽  
High Level

The genus Acer L. has about 156 species which are distributed in Asia, Europe, Northern Africa and North America. The species of Acer show extensive morphological and molecular diversity and the species that co-occur may hybridize; therefore, sometimes the species delimitation turns out to be difficult. Eight Acer (maple) species have been reported in Iran. The velvet maple—Acer velutinum Boiss (1846: 28)—is one of the largest maples in the world and the most frequent maple species in Iran. Morphologically speaking, two varieties have been cited for this species. Due to the extensive morphological variability, however, the researchers encounter difficulty delimiting these two varieties. Against this backdrop, the present study was performed with the aim to delimit two varieties of Acer velutinum by using both morphological and molecular approaches. It also aimed to proffer data on the genetic diversity of this species in the country. Nighty-four plant specimens of A. velutinum were randomly collected within 14 geographical populations at four provinces in Hyrcanian forests of Iran. The PsbA-trnHGUG intergenic spacer sequence of cp-DNA and the ISSR molecular markers along with the morphometric analysis and image analysis of the leaf shape were used. The numerical and phylogenetic analyses of the tree specimens from the presumed varieties of A. velutinum—based on morphology, image analysis of leaf shape, ISSR and cp-DNA—did not delimit these varieties; hence, A. velutinum was considered to have a high level of intergrading morphological variability. The population genetic study revealed significant molecular differences among the studied populations. The STRUCTURE plot and gene flow analysis (Nm), nevertheless, revealed some degree of shared alleles among the populations. The Mantel tests demonstrated significant correlation between the geographical and genetic distance of the studied populations; it further signaled the fact that the gene flow occurred mainly between the coterminous populations.

Population structure and phylogenetic relationships of Ceutorhynchus neglectus (Coleoptera: Curculionidae)

2005 ◽  
Vol 137 (6) ◽  
pp. 672-684 ◽  
Author(s):  
R. D. Laffin ◽  
L. M. Dosdall ◽  
F.A.H. Sperling
Keyword(s):  
Population Structure ◽  
Gene Flow ◽  
North America ◽  
Phylogenetic Relationships ◽  
Nuclear Dna ◽  
Isolation By Distance ◽  
Coi Gene ◽  
Restricted Gene Flow ◽  
Species Variation ◽  
Internal Transcribed Spacer Region

AbstractCeutorhynchus neglectus Blatchley is a weevil that is native to, and widely distributed in, North America. It has life-history characteristics similar to its alien invasive congener, Ceutorhynchus obstrictus (Marsham), the cabbage seedpod weevil. Our study was undertaken to compare the population structure of C. neglectus in North America to that of C. obstrictus, which, in contrast, was introduced only recently to North America and might be expected to have a simpler population structure. We also compared the population structure of C. neglectus to that of Pissodes strobi (Peck), which is known to possess high levels of intraspecific variation and is also a Nearctic weevil. We sequenced a 790-bp fragment of mtDNA (cytochrome oxidase I (COI) gene) and a 117-bp fragment of nuclear DNA (internal transcribed spacer region 1 (ITS1)). Nested clade analysis inferred contiguous range expansion and restricted gene flow with isolation by distance. Analysis of molecular variance also supported restricted gene flow between geographically distant populations. However, within-species variation in C. neglectus was lower than that for other weevil species including C. obstrictus. We also examined DNA divergences and phylogenetic relationships among 10 species of Ceutorhynchus using parsimony analysis of a 2.3-kb fragment of mtDNA (COI–COII) and a 541-bp fragment of nuclear DNA (elongation factor 1α).

scholarly journals North America Insect Invades the World: the Case of the Flood Mosquito, Aedes vexans (Diptera: Culicidae), from Mitochondrial DNA

2021 ◽  
Author(s):  
Jose Heriberto Vargas-Espinosa ◽  
Oscar Alexander Aguirre Obando
Keyword(s):  
Gene Flow ◽  
Gene Diversity ◽  
Isolation By Distance ◽  
Vector Competence ◽  
Coi Gene ◽  
West Nile Fever ◽  
Aedes Vexans ◽  
Genetic Structuring ◽  
Long Distance ◽  
Valley Fever

The flood mosquito, Aedes vexans (Diptera: Culicidae), native of Canada, and currently present in all continents, has a vector competence for 30 arboviruses, being responsible for transmitting diseases, like West Nile fever, Rift Valley fever, Saint Louis Encephalitis and Eastern Equine Encephalitis. Hence, knowing the structure and gene flow of A. vexans is important to develop adequate vector control strategies for this species. For this, from partial sequences of the mitochondrial COI gene available in Bold and GenBank, it was possible to determine the Haplotypic (Hd) and nucleotide (π) gene diversity, genetic structuring and gene flow at global, continental, and country levels. In total, 1184 sequences were recovered, distributed between America (88.60%), Europe (7.35%), Asia (3.89%), and Africa (0.17%). From these, 395 haplotypes (H) were detected without presence of pseudogenes (NUMTs), with H1 being the most frequent (24.58%) and between H12 - H395 the least frequent varying between 0.93% (H12) and 0.08% (H395). Phylogenetically, the haplotypes were grouped into six clades. Clade I grouped haplotypes from countries in America and Europe, while clades II and III presented haplotypes exclusively from Asia and Europe; clade IV grouped only one haplotype from Africa and the last ultimo clade V grouped haplotypes from America and Africa. The global Hd and π was 0.92 and 0.01, respectively. In addition, evidence was obtained of genetic structuring among continents (7.07%), countries (1.62%), and within countries (91.30%; FST = 0.08, p < 0.05) and no isolation by distance was detected (r = 0.003, p > 0.05). These results suggest that the mosquito populations that invaded other continents originate directly from the American continent, where possibly transcontinental commercial routes favored their long-distance dispersion.

Two new species of Cyrtodactylus (Squamata: Gekkonidae) from northern Laos, including new finding and expanded diagnosis of C. bansocensis

Zootaxa ◽  
2020 ◽  
Vol 4822 (4) ◽  
pp. 503-530
Author(s):  
NICOLE SCHNEIDER ◽  
VINH QUANG LUU ◽  
SALY SITTHIVONG ◽  
ALEXANDRE TEYNIÉ ◽  
MINH DUC LE ◽  
...  
Keyword(s):  
New Species ◽  
Genetic Divergence ◽  
New Record ◽  
Phylogenetic Analyses ◽  
Molecular Data ◽  
Species Group ◽  
Coi Gene ◽  
Two New Species ◽  
New Finding ◽  
Morphological And Molecular Data

Two new Cyrtodactylus species are described from Houaphan and Luang Prabang provinces in Laos based on morphological and molecular data. Cyrtodactylus houaphanensis sp. nov. differs from all other Cyrtodactylus in the C. wayakonei species group by at least 3.3 % genetic divergence in the COI gene and can be diagnosed in morphology as follows: SVL 75.8 mm; supralabials 9 or 10; infralabials 8 or 9; ventral scales 35; dorsal tubercles in 20 rows at midbody; precloacal pores 6 in the male; femoral pores absent; subcaudals enlarged; five irregular, brown bands between limb insertions. The new species morphologically resembles C. chauquangensis and revealed to be a sister taxon to C. puhuensis according to our genetic analyses, from which it mainly differs in the absence of enlarged femoral scales. Cyrtodactylus ngoiensis sp. nov. differs from other closely related congeners by at least 11.6 % genetic divergence in the COI gene and can be diagnosed in morphology as follows: maximum SVL 95.3 mm; supralabials 6–9; infralabials 8–11; ventral scales 38–43; dorsal tubercles in 15–21 rows at midbody; enlarged femoral scales present; precloacal pores 7 in the male, 7 pitted scales in females; femoral pores 14 in the male, absent in females; five bright yellowish transverse dorsal bands; subcaudals enlarged. The new species is shown to be a member of the C. wayakonei species group, but morphologically resembles C. dumnuii from Thailand. According to our phylogenetic analyses, it is a basal taxon to a clade comprising C. spelaeus, C. chauquangensis, C. vilaphongi, C. cucphuongensis, C. puhuensis, C. houaphanensis, C. otai and C. bobrovi. Based on a new record of C. bansocensis from central Laos, which represents the first recorded female we provide a redescription of C. bansocensis including expanded diagnosis. In addition, an updated identification key for the Cyrtodactylus known from Laos is provided. 

scholarly journals A new species of Cyrtodactylus Gray, 1827 (Squamata, Gekkonidae) from Yunnan, China

ZooKeys ◽  
2021 ◽  
Vol 1021 ◽  
pp. 109-126
Author(s):  
Shuo Liu ◽  
Dingqi Rao
Keyword(s):  
New Species ◽  
Bayesian Inference ◽  
Yunnan Province ◽  
Phylogenetic Analyses ◽  
Dorsal Surface ◽  
Morphological Characters ◽  
Species Group ◽  
Coi Gene ◽  
Unique Combination ◽  
A New Species

A new species of Cyrtodactylus is described on the basis of five specimens collected from the karst formations of Zhenkang County, Yunnan Province, China. Cyrtodactylus zhenkangensissp. nov. is recognized by having a unique combination of morphological characters, the most diagnostic being: 12–15 enlarged femoral scales on each thigh; 2–5 femoral pores on each thigh in males, 0–3 pitted scales on each thigh in females; eight or nine precloacal pores in a continuous row or separated by one poreless scale in males, 7–9 pitted scales in females; subcaudals enlarged, arranged alternately as single and double on anterior and mostly single at middle and posterior; dorsal surface of head with obvious reticulations. Phylogenetic analyses show that the new species is a member of the C. wayakonei species group and a sister taxon to a clade consisting of C. wayakonei and C. martini based on Maximum Likelihood analyses and Bayesian Inference and differs from its congeners by at least 12.0% genetic divergence in a fragment of the COI gene.

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