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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Provenance Variation in Seed Morphometric Traits and Growth Performance of Senna siamea (Lam.) Erwin et Barneby at Lad Krating Plantation, Chachoengsao Province, Thailand) ผู้เขียน: ชาคริต ณ ตะกั่วทุ่ง,  ดร.ดำรง พิพัฒนวัฒนากุล, ผู้ช่วยศาสตราจารย์ , นายสุรีย์ ภูมิภมร, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractGenetic variation patterns of Khilek (Senna siamea (Lam.) Erwin et Barneby) an indigenous species with potential as a source of wood energy, were evaluated at the population level. Seed samples were collected from nine provenances throughout Thailand and examined for variations in seed morphometric traits and growth performance in provenance trials in the Lad Krating plantation. Analysis of variance revealed signifi cant differences among provenances in all the study traits except the relative growth rate in some stages of development. The provenance effect as determined by broad sense heritability was 50–83% for seed morphometric traits, 53–85% for height, 33–62% for diameter at ground level, 14–67% for the height relative growth rate and 11–50% for the diameter at ground level relative growth rate. Signifi cant correlations were found within seed mophometric traits and growth characters while the inter-character correlations between seed and growth characters were very weak. At this early stage, it is recommended that the top three most suitable provenances for planting are Potaram (Ratchaburi-seed lot 2002), Muang (Kanchanaburi), and Muaklek (Saraburi). The observed patterns of variation will have important implications for gene conservation and the tree improvement program of the species. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Morphometric Analysis of Three Draco Lizard Species (D. blanfordii, D. maculatus, and D. taeniopterus) (Squamata: Agamidae) from Thailand) ผู้เขียน:Nattawut Srichairat, ดร.พัฒนี จันทรโรทัย, รองศาสตราจารย์ , ดร.ประทีป ด้วงแค, รองศาสตราจารย์ , ยอดชาย ช่วยเงิน สื่อสิ่งพิมพ์:pdf AbstractTwo hundred sixty-seven preserved specimens of three Draco lizard species from Thailand consisting of D. blanfordii (17 females and 70 males), D. maculatus (58 females and 79 males) and D. taeniopterus (13 females and 30 males) were examined using 21 morphometric characters and 25 character ratios to assess morphometric differences. The results of univariate analysis showed that there were 12 morphometric characters and 2 character ratios that can be used for discrimination of the three Draco species regardless of sexual differences. Among these three species, it was found that 13 morphometric characters and 7 character ratios and 15 morphometric characters and 8 character ratios can be used to discriminate female and male lizards, respectively. The results of cluster analysis produced a dendrogram of the relationships among the three species and revealed that the three Draco species were divided into two morphometric clusters at a level of 0% of information remaining in which the D. blanfordii cluster was distinctly different from the D. maculatus and D. taeniopterus cluster. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Cryptic Biodiversity in Two Closely Related Curcuma (Zingiberaceae) Species in Thailand Revealed by Molecular and Morphometric Analyses) ผู้เขียน:Sutthira Khumkratok, Kriangsuk Boontiang, Prasit Chutichudet, Pairot Pramual สื่อสิ่งพิมพ์:pdf AbstractTh e genus Curcuma L. has several significant uses including in herbal medicine, as food and for decoration. However, the taxonomy of this genus has posed a challenge to traditional taxonomy due to the great morphological variation related to high levels of polyploidization and extensive hybridization. This study investigated the morphological and genetic differentiation between two closely related Curcuma species—Curcuma gracillima and C. parviflora—in Thailand. Principal components analysis of the 15 morphological characters revealed three morphological groups. Specimens of C. parviflora formed one group while those of C. gracillima separated into two groups. Genetic analysis based on matK and internal transcribed spacer (ITS) sequences revealed greater genetic diversity in C. gracillima corresponding with its high morphological variation. Phylogenetic study revealed that C. parviflora is monophyletic; while, C. gracillima is polyphyletic due to samples of this species forming two distinct clades consistent with two morphologically divergent groups. Comparisons of the efficiency for discriminating species indicated that ITS is more effective than the matK sequences with nearly perfect species identification (95%) compared to 58% for matK sequences. Therefore, the ITS sequences should be used as the barcoding sequences, at least for Curcuma species. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Classification of Three Crab Morphs in the Genus Scylla using Morphometric Analysis) ผู้เขียน:ดร.ประดิษฐ์ แสงทอง, ผู้ช่วยศาสตราจารย์ , ดร.อำนวย จรด้วง, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractOne hundred and fifty-four male mud crabs in the genus Scylla were collected from different coastal areas of the Gulf of Thailand and the Andaman Sea, including Trat, Ranong and Surat Thani Provinces. They were classified into three morphs, “black”, “white” and “violet” based on their phenotypes and body colors. Fifty-one morphometric characters were observed and used for canonical variate analysis (CVA) and Mahalanobis’ Distance analysis. CVA results showed completely separation of three morph clusters with true correlation to its phenotypes and without overlapping among different clusters. Morphological differences among crab morphs were confirmed by considerably high value of Mahalanobis’ Distance in the range of 53.283 – 60.806 but those within morphs were in the range of 6.922 – 15.027. Both CVA and Mahalanobis’ Distance as well as their morphological data suggested that these three crab morphs of “black” “white” and “violet” should be classified into three distinct species of S. olivacea, S. paramamosain and S. tranquebarica, respectively. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Discrimination of Two Tetragonula (Apidae: Meliponini) Species in Thailand using Geometric Morphometric Analysis of Wing Venation) ผู้เขียน:Atsalek Rattanawannee, Orawan Duangpakdee, Preecha Rod-im, Randall Hepburn สื่อสิ่งพิมพ์:pdf AbstractGeometric morphometrics is a novel powerful tool for the identification of bee species and subspecies. An application of this method is presented to discriminate two stingless bee species, Tetragonula pagdeni Schwarz, 1939 and Tetragonula fuscobalteata Cameron, 1908, in Thailand based on forewing venation. Nine landmarks were measured from the digitized right forewing of 200 workers (10 bees per colony). Eleven colonies of T. pagdeni and nine colonies of T. fuscobalteata collected from several locations in Thailand were determined. The positions of the groups in the principal component analysis plots revealed that the species are clearly distinct. Multivariate analysis of variance (? = 0.01) showed a significant difference between the bees of the sibling species, producing a high degree of accuracy (96.50%) in the identification of any individual bee of either species. Therefore, it is proposed that geometric morphometric analysis of single wings might be an appropriate first step in the analysis and identification of stingless bees and other insects. |
ที่มา:มหาวิทยาลัยเกษตรศาสตร์หัวเรื่อง:Morphometric relationship of weight and size of cultured freshwater pearl mussel, Hyriopsis (Limnoscapha) myersiana, under laboratory conditions and earthen pond phases |
ที่มา:Lakeside Scholar,California Academy of SCience, Sanfancisco, USAหัวเรื่อง:การศึกษาสัณฐานทางเรขาคณิตของหอยสองฝาวงศ์ Pinnidae ของประเทศไทย หัวหน้าโครงการ:ดร.ชีวารัตน์ พรินทรากูล, รองศาสตราจารย์ |
ที่มา:การประชุมครั้งที่ 3 อนุกรมวิธานและซิสเทมาติคส์ใประเทศไทยหัวเรื่อง:การประยุกต์ใช้วิธีการวิเคราะห์ทางมอร์โฟเมตริกแบบจีโอเมตริกของรูปแบบเส้นปีกในการจัดจำแนกชันโรงที่มีลักษณะสัณฐานวิทยาซับซ้อนในประเทศไทย |
ที่มา:วารสารสัตวแพทยศาสตร์ มข.หัวเรื่อง:การเปรียบเทียบขนาดหัวอสุจิละมั่งสายพันธุ์พม่า (Cervus elldi thamin) ที่ผ่านการแช่แข็งในสารละลายน้ำเชื้อชนิด TRIS และ BF5F ด้วยระบบคอมพิวเตอร์ (CASA) |
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 Researcherดร. เทพไท ไชยทอง, อาจารย์ที่ทำงาน:ภาควิชาภูมิศาสตร์ คณะสังคมศาสตร์ สาขาที่สนใจ:ภัยพิบัติทางธรรมชาติ, แบบจำลองดินถล่ม, geospatial analysis, hydro-geohazard Resume |
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