Academic literature on the topic 'Morphometric variation'

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Journal articles on the topic "Morphometric variation"

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Amol A, Shinde, Agrawal Sakshi, and Patel Dinesh K. "Splenic Notches and Morphometrics of Spleen as Tools for Sexual Dimorphism: an Analysis in Pune Region of Maharashtra." International Research Journal of Multidisciplinary Scope 06, no. 01 (2025): 833–40. https://doi.org/10.47857/irjms.2025.v06i01.02752.

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Variations in shapes and morphometry of spleen is seen. Number and location of splenic notches show regional variation. This study is done to determine tools for sexual dimorphism of spleen. 72 spleen of known sex were used from cadavers used for 1st MBBS dissection. Shape, number and location of splenic notches were noted. Length, breadth, thickness and weight of spleen were calculated. Triangular shaped spleen was seen most commonly. Maximum 5 notches were seen on a spleen. Morphometric measurements showed regional variations and sexual dimorphism. We conclude that formation of splenic notch
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Cadrin, Steven X., and Vaughn M. Silva. "Morphometric variation of yellowtail flounder." ICES Journal of Marine Science 62, no. 4 (2005): 683–94. http://dx.doi.org/10.1016/j.icesjms.2005.02.006.

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Abstract Significant variation in morphometry was found between sexes of yellowtail flounder and among eight geographic areas, from the Grand Bank to the Mid-Atlantic Bight. Females had relatively deeper abdomens and larger heads than males. Newfoundland samples had relatively shorter bodies, deeper abdomens and longer heads than those from south of Nova Scotia. Morphometric analyses classified 71–95% of yellowtail to the correct Canadian area, but accuracy was lower for areas off the northeastern United States (43–76%). Morphometric differences are consistent with differences in ontogenetic r
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Das, Mithun, Md Mahiuddin Zahangir, Fatema Akhter, Md Main Uddin Mamun, and Md Moudud Islam. "Land-Mark based morphometric and meristic variations in two congeneric hilsha population, Tenualosa ilisha and Tenualosa toli from Bangladesh water bodies." Asian Journal of Medical and Biological Research 6, no. 2 (2020): 265–82. http://dx.doi.org/10.3329/ajmbr.v6i2.48072.

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The morphometric characters are effectively used for the better differentiation among the fish population and sustainable management. The appraisal of the natural population stock and morphological variation within and between two hilsha species (Tenualosa ilisha and Tenualosa toli) from three different habitat (Coastal, riverine and marine) of Bangladesh, were investigated by applying the land mark based morphometric and meristic variation measurement methods. All data were adjusted and Univariate ANOVA, where discriminant function analysis (DFA) and principal component analysis (PCA) exhibit
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OLSTAD, K., A. P. SHINN, L. BACHMANN, and T. A. BAKKE. "Host-based identification is not supported by morphometrics in natural populations of Gyrodactylus salaris and G. thymalli (Platyhelminthes, Monogenea)." Parasitology 134, no. 14 (2007): 2041–52. http://dx.doi.org/10.1017/s0031182007003332.

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SUMMARYGyrodactylus salaris is a serious pest of wild pre-smolt Atlantic salmon (Salmo salar) in Norway. The closely related G. thymalli, originally described from grayling (Thymallus thymallus), is assumed harmless to both grayling and salmon. The 2 species are difficult to distinguish using traditional, morphometric methods or molecular approaches. The aim of this study was to explore whether there is a consistent pattern of morphometrical variation between G. salaris and G. thymalli and to analyse the morphometric variation in the context of ‘diagnostic realism’ (in natural populations). Sp
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I Made Budiarsa, Fatmah Dhafir, and Manap Trianto. "Morphometrical Variations of Tetragonula laeviceps in Different Habitats in Central Sulawesi Province." BIOEDUSCIENCE 6, no. 2 (2022): 165–70. http://dx.doi.org/10.22236/j.bes/625062.

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Background: Habitat is a place for living things to grow and develop. Differences in habitat in an area can affect the size of an organism. This study aims to determine the morphometric variations of Tetragonula laeviceps found in urban and forest habitats in Central Sulawesi Province. Methods: This research was conducted with roaming technique. Morphometric characters observed were 35 characters of stingless bee and analyzed using Microsoft Excel software. Results: The results of this study indicated that the morphometric size variation of T. laeviceps found in forest habitats (3.58 mm) is gr
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Tripathy, Subodh Kumar. "Significance of Traditional and Advanced Morphometry to Fishery Science." Journal of Human, Earth, and Future 1, no. 3 (2020): 153–66. http://dx.doi.org/10.28991/hef-2020-01-03-05.

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Morphometric characters of fishes are measurable or metric characters. Morphometrics is a more or less interwoven set of large statistical procedures to analyze variability in the size and shape of organisms. Morphometrics and phylogenetics of a species are combined to utilize existing phylogeny which addresses hypotheses of shape change through evolutionary time. Morphometric differences among stocks of a species are recognized as important to evaluate population structure and form a basis to identify stocks. Advancements in morphometrics used powerful tools for testing and displaying differe
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O'Malley, Brian P., Joseph D. Schmitt, Jeremy P. Holden, and Brian C. Weidel. "Comparison of Specimen- and Image-Based Morphometrics for Cisco." Journal of Fish and Wildlife Management 12, no. 1 (2020): 208–15. http://dx.doi.org/10.3996/jfwm-20-029.

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Abstract Morphometric data from fish are typically generated using one of two methods: direct measurements made on a specimen or extraction of distances from a digital picture. We compared data on 12 morphometrics collected with these two methods on the same collection of Cisco Coregonus artedi from Lake Ontario, North America, to assess the degree of bias in measurements made directly on a specimen- vs. an image-based method. We also assessed the degree of reproducibility within the image-based method by evaluating the amount of variation between different analysts for each morphometric metho
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Furman, Eeva R. "Geographical variation of Balanus improvisus in biochemical and morphometric characters." Journal of the Marine Biological Association of the United Kingdom 70, no. 4 (1990): 721–40. http://dx.doi.org/10.1017/s0025315400059002.

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Samples of Balanus improvisus were collected from 15 sites in the Baltic, the west coast of Sweden, the British Isles and North America. They were analysed with horizontal starch gel electrophoresis for 11 loci and with opercular plate morphometry for 10 metrical characters. Analyses of isozyme patterns revealed a high degree of genetic similarity amongst populations. The Baltic sites, however, showed less heterozygote deficiency than the British and American sites indicating higher stability and outcrossing in the Baltic. Morphometric characters showed somewhat more heterogeneity than isozyme
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Carneiro, Lazaro, Cândida Maria Lima Aguiar, Willian Moura Aguiar, Elon Souza Aniceto, Lorena Andrade Nunes, and Vinina Silva Ferreira. "Morphometric Variability among Populations of Euglossa cordata (Hymenoptera: Apidae: Euglossini) from Different Phytophysiognomies." Sociobiology 66, no. 4 (2019): 575. http://dx.doi.org/10.13102/sociobiology.v66i4.4675.

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Geometric morphometrics is a tool capable of measuring the response of organisms to different environmental pressures. We tested the hypothesis that E. cordata wing morphometry, as an indicator of response to environmental pressure, it would vary depending on habitat changes, in the Atlantic Forest, Savanna and dry forest (Caatinga). For analysis of wing shape and size, 18 landmarks were digitized at the intersections of the wing veins 348 individuals. Except for the two populations sampled in Chapada Diamantina, the wing shape had significant statistical variations among the populations (p &l
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Corti, M., R. S. Thorpe, L. Sola, V. Sbordoni, and S. Cataudella. "Multivariate Morphometrics in Aquaculture: A Case Study of Six Stocks of the Common Carp (Cyprinus carpio) from Italy." Canadian Journal of Fisheries and Aquatic Sciences 45, no. 9 (1988): 1548–54. http://dx.doi.org/10.1139/f88-183.

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Multivariate morphometry was used to investigate the distinctness and interrelationships of six stocks of the common carp (Cyprinus carpio). A "size" component was clearly identified by multiple group principal component analysis. Canonical variate analysis computed only on the "shape" components showed that the stocks were morphometrically distinct and that the phenetic relationships based on allozymic and morphometric data are highly congruent. We therefore suggest that multivariate morphometrics could represent an appropriate and convenient tool to detect variation between strains in carp c
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Dissertations / Theses on the topic "Morphometric variation"

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Gause, Austin R. J., Lance D. Jessee, and Blaine W. Schubert. "Geometric Morphometric Analysis of Intervertebral Variation in Colubrid Snakes." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/asrf/2019/schedule/199.

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Snake vertebrae are common throughout the Cenozoic fossil record, but identification of isolated vertebrae often proves difficult due to inter- and intra-columnar variability. Most fossil identifications are based on comparisons with disarticulated modern specimens, with a focus on mid-trunk vertebrae. One focus of this study was to determine the necessity of identifying a true mid-trunk vertebra prior to identification and to develop a method of locating the columnar position of an isolated vertebra for both modern and fossil identifications. Colubrid genera Farancia and Heterodon were chosen
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Sorrentino, Rita <1989&gt. "Exploring morphological variation in hominid talar bones using geometric morphometric approaches." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/8876/1/Rita%20Sorrentino_PhD_thesis.pdf.

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This thesis focused on the exploration of morphological variation in extinct and extant hominid talar bones through (semi)landmark-based geometric morphometric methods. The first section of this project analyzes sexual dimorphism in three modern human groups for which the sex is known from cemetery and municipal records. Shape, form and size variables have been investigated. Results shown that changes in size have the higher power in driving sexual differences in modern humans. The second section aims to evaluate both external and internal (trabecular bone) architecture of modern human tali
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Warman, Sylvia Mary. "Morphometric investigation of dental variation to examine genetic relationships between pig populations." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342558.

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De, Beer Chénelle Lesley. "Genetic and morphometric variation of Octopus vulgaris in the Benguela Current region." Thesis, Rhodes University, 2014. http://hdl.handle.net/10962/d1012971.

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The Benguela Current is a cold eastern boundary current located on the south-western coast of the African continent. The establishment of its present day features approximately two million years ago has triggered allopatric events which have driven genetic and/or phenotypic differentiation in many of the warm-temperate organisms that previously had continuous distributions along the south and west coast of southern Africa. However, since many of these species have responded differently, despite similar isolation times, research in this region provides a unique opportunity to increase our under
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Schulz, Ariadne Lucia. "Morphometric analysis of variation in human proximal long bones within and between populations." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12681/.

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Morphological variation and reactivity in human bone underpins many research questions in palaeopathology, osteoarchaeology, and anthropology. Studies on the post-crania primarily pertain to the cross-sectional geometry and epiphyseal or joint morphology and diaphyseal curvature. Very few studies address diaphyseal surface morphology. This study aims to quantify morphology of the epiphyses, diaphyseal surface morphology, and cross-sectional morphology of human proximal long bones in relation to interpopulation and intrapopulation variables including sex, age, childhood stress indicators, and p
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Wessels, Grea. "Meristic and morphometric variation among sardine Sardinops sagax around the coast of southern Africa." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/11575.

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Includes abstract.<br>Includes bibliographical references (p. 72-81).<br>Meristic counts and morphometric measurements were made on previously frozen sardine Sardinops sagax to determine whether there is a difference in the shape of sardine from different areas around southern Africa. Because freezing influences body size, eight different freezing periods were examined to determine the effects of freezing duration on the caudal length, weight and 21 morphometric measurements of sardine collected from commercial catches at Gans Bay and Saldanha Bay, South Africa. The relative weight loss of sar
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Wieg, Christina. "Geographic Variation in the Bahamian Brown Racer, Alsophis Vudii." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1244729278.

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Souza, Gomes da Fontoura Clarissa. "Candidate gene analyses of craniofacial variation in malocclusion phenotypes." Diss., University of Iowa, 2019. https://ir.uiowa.edu/etd/6860.

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The precise role that genes play in early craniofacial development and postnatal craniofacial growth are essential to understand dento-facial development overall. However, genotype-phenotype correlations between genetic variation of early craniofacial genes and adult craniofacial phenotypes is poorly understood. Thus, this thesis focused on identifying the genetic etiology underlying phenotypic variations present in malocclusion conditions. First, we performed genotype-phenotype association analyses between common variants in 82 craniofacial genes and phenotypic variations extracted from 2D an
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Umphrey, Gary John Carleton University Dissertation Biology. "Differentiation of sibling species in the ant genus Aphaenogaster; karyotypic, electrophoretic, and morphometric investigations of the Fulva-Rudis-Texana complex." Ottawa, 1992.

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White, Suzanna. "The taxonomic status of the Middle Pleistocene hominins : a 3D geometric morphometric investigation of variation in the supraorbital region." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10059775/.

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This study investigated the significance of variation in the supraorbital morphology of the Middle Pleistocene hominins (MPH), using 3D geometric morphometric methods and a comparative taxonomic framework. The morphology of the supraorbital and orbital region of fourteen MPH from Africa, Asia, and Europe was recorded using 230 3D landmarks and surface semilandmarks. A comparative sample of 460 primates (Pan, Gorilla, Papio and Macaca) and 237 hominins (Early Pleistocene to Holocene) were included to model supraorbital variation in groups of varying taxonomic classification, ecology, and geogra
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Books on the topic "Morphometric variation"

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Ramos, Colleen N. Morphometric variation among some leporids (Mammalia: Lagomorpha) of North America. Denver Museum of Natural History, 1999.

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Alexander, Lois F. A morphometric analysis of geographic variation within Sorex monticolus (Insectivora:Soricidae). Natural History Museum, University of Kansas, 1996.

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Kosma, Veli-Matti. Reproducibility and sources of variation in morphologic and morphometric diagnostic histopathology. Dept. of Pathology, University of Kuopio, 1986.

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Ericson, Per G. P. Osteology of the eider, Somateria mollissima (L.): A study of sexual, geographic, and temporal morphometric variation in the eider skeleton. Statens Historiska Museum, 1987.

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Alexander, Lois F. A morphometric analysis of geographic variation within Sorex monticolus. 1994.

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A morphometric analysis of geographic variation within Sorex monticolus (Insectivora:Soricidae). Natural History Museum, University of Kansas, 1996.

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Alexander, Lois F. Morphometric Analysis of Geographic Variation Within Sorex Monticolus (Insectivora : Soricidae). Creative Media Partners, LLC, 2018.

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Morphometric Analysis of Geographic Variation Within Sorex Monticolus (Insectivora : Soricidae). Creative Media Partners, LLC, 2022.

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Kidd, Robert Stewart. An investigation into the patterns of morphological variation in the proximal tarsus of selected human groups, apes and fossils: A morphometric analysis. 1996.

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Aspden, Richard, and Jenny Gregory. Morphology. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199668847.003.0011.

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The study of joint morphology can help us to understand the risk factors for osteoarthritis (OA), how it progresses, and aids in developing imaging biomarkers for study of the disease. OA results in gross structural changes in affected joints. Growth of osteophytes, deformation of joint components, and loss of joint space where cartilage has broken down are all characteristics of the disorder. Certain bone shapes as well as malalignment predispose people to future OA, or may be a marker for early OA. Geometrical measures, such as the alpha angle or Wiberg’s CE angle, used to be the primary too
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Book chapters on the topic "Morphometric variation"

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Das, Simon Kumar. "Morphometric and Meristic Variation of Archer Fish." In Archer Fish Biology. CRC Press, 2023. http://dx.doi.org/10.1201/9781003027676-2.

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Cavalcanti, Mauro J. "Geometric morphometric analysis of head shape variation in four species of hammerhead sharks (Carcharhiniformes: Sphyrnidae)." In Morphometrics. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08865-4_8.

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Coetzee, Louise. "Species or morphological variation? A multivariate morphometric analysis of Afroleius simplex(Acari, Oribatida, Haplozetidae)." In Trends in Acarology. Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9837-5_43.

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Bastir, Markus, and Antonio Rosas. "Geometric morphometrics in paleoanthropology: Mandibular shape variation, allometry, and the evolution of modern human skull morphology." In Morphometrics. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-08865-4_16.

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Raju, A. J. Solomon. "Morphometric Variation and Floral Resources of the Dwarf Honeybee, Apis florea F. in Andhra Pradesh and Telangana, India." In The Future Role of Dwarf Honeybees in Natural and Agricultural Systems. CRC Press, 2020. http://dx.doi.org/10.1201/9781003033936-13.

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Kapoor, B. G., and Bhavna Khanna. "Morphometrics; Taxonomy; Meristic Variation." In Ichthyology Handbook. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-07844-0_2.

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Loy, Anna. "An Introduction to Geometric Morphometrics and Intraspecific Variation." In Advances in Morphometrics. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-9083-2_22.

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Corti, Marco, Carlo Fadda, Shimon Simson, and Eviatar Nevo. "Size and Shape Variation in the Mandible of the Fossorial Rodent Spalax ehrenbergi." In Advances in Morphometrics. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-9083-2_25.

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Walker, Jeff A. "Principal Components of Body Shape Variation within an Endemic Radiation of Threespine Stickleback." In Advances in Morphometrics. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-9083-2_26.

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Roy, Denis, Kay Lucek, Esther Bühler, and Ole Seehausen. "Correlating Shape Variation with Feeding Performance to Test for Adaptive Divergence in Recently Invading Stickleback Populations from Swiss peri-alpine Environments." In Morphometrics for Nonmorphometricians. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-95853-6_10.

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Conference papers on the topic "Morphometric variation"

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Li, Bingjue, Andrew P. Murray, David H. Myszka, and Gérard Subsol. "Synthesizing Planar Rigid-Body Chains for Morphometric Applications." In ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59412.

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Morphometrics is a quantitative analysis to compare a set of geometric representations of forms, including shape and size. Analysis of shape variation is useful in systematics, evolutionary biology, biostratigraphy, and developmental biology. Distinguished by the data being analyzed, three forms of morphometrics are commonly recognized. Traditional morphometrics measures the lengths, ratios, angles, etc., of patterns of shape variations. Outline-based morphometrics analyzes the outlines of forms using open or closed curves. Landmark-based geometric morphometrics summarizes shapes in terms of t
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TATSUTA, HARUKI, HIROYOSHI IWATA, and KOICHI GOKA. "Morphometric Studies on the Variation of Male Lucanid Beetle Mandibles." In Proceedings of the 2nd International Symposium. WORLD SCIENTIFIC, 2013. http://dx.doi.org/10.1142/9789814518413_0004.

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TATSUTA, HARUKI, HIROYOSHI IWATA, and KOICHI GOKA. "Morphometric Studies of Male Lucanid Beetle Mandibles: Shape Variation between Hybrid Subspecies." In Proceedings of the 1st International Symposium. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814355247_0007.

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Tajika, Amane, Neil H. Landman, Kenji Ikuno, Naoki Morimoto, and Mariah Slovacek. "MORPHOMETRICS AND QUANTIFICATION OF INTRASPECIFIC VARIATION THROUGH ONTOGENY IN THE LATE CRETACEOUS NAUTILOID EUTREPHOCERAS USING LINEAR- AND GEOMETRIC MORPHOMETRIC APPROACHES." In GSA Annual Meeting in Phoenix, Arizona, USA - 2019. Geological Society of America, 2019. http://dx.doi.org/10.1130/abs/2019am-337144.

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Gully, Amelia J. "Quantifying Vocal Tract Shape Variation and its Acoustic Impact: A Geometric Morphometric Approach." In Interspeech 2021. ISCA, 2021. http://dx.doi.org/10.21437/interspeech.2021-1400.

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Омельяненко, Т. З., and Н. А. Багрикова. "VARIABILITY OF MORPHOMETRIC PARAMETERS L. IN THE FOOTHILL CRIMEA." In Сотрудничество ботанических садов в сфере сохранения ценного растительного генофонда. Материалы Международной научной конференции, посвященной 10-летию Совета ботанических садов стран СНГ при МААН. Crossref, 2022. http://dx.doi.org/10.35102/cbg.2022.48.45.070.

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Ambrosia artemisiifolia L. является широко распространенным инвазивным растением в Предгорном Крыму. Внедряется в экотопы различной степени нарушенности. Проведен анализ качественных и количественных морфометрических параметров в трех ценопопуляциях Ambrosia artemisiifolia в различных локалитетах Симферопольского района, описанных в 2020 г. Установлено, что наибольшие значения биоморфологических показателей характерны для ценопопуляций, описанных в синантропных и рудеральных сообществах. Для большинства параметров отмечен высокий (21-40 %) и очень высокий (&gt; 40 %) показатели коэффициента ва
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Spalević, Velibor, Milica Filipović, and Dejan Zejak. "Morphometric characterization of Lim river tributaries in the mountainous terrain of Plav, Montenegro." In 7th International Scientific Conference Modern Trends in Agricultural Production, Rural Development and Environmental Protection. The Balkans Scientific Center of the Russian Academy of Natural Sciences, 2025. https://doi.org/10.46793/7thmtagricult.27s.

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This study investigates five tributary basins of the Lim River – Đurička, Komaračka, Novšićki River, Bijeli River, and Velička River – located in the mountainous terrain of the Plav municipality in north-eastern Montenegro. The primary objective is to quantify morphometric parameters that influence hydrological behaviour, runoff generation, and erosion risk. The research addresses a critical knowledge gap stemming from the lack of detailed morphometric analyses for these basins, which are highly susceptible to erosion and flash flooding due to steep slopes and complex topography. Using a combi
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Tiwari, R. K., P. K. Garg, A. Shukla, R. S. Ahluwalia, N. Singh, and P. Chauhan. "A geomorphic and morphometric analysis of surface ice velocity variation of different valley type glaciers." In SPIE Asia-Pacific Remote Sensing, edited by Reza Khanbilvardi, Ashwagosh Ganju, A. S. Rajawat, and Jing M. Chen. SPIE, 2016. http://dx.doi.org/10.1117/12.2227108.

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Aneja, Deepali, Siddharth R. Vora, Esra D. Camci, Linda G. Shapiro, and Timothy C. Cox. "Automated Detection of 3D Landmarks for the Elimination of Non-Biological Variation in Geometric Morphometric Analyses." In 2015 IEEE 28th International Symposium on Computer-Based Medical Systems (CBMS). IEEE, 2015. http://dx.doi.org/10.1109/cbms.2015.86.

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Molchanov, Vladimir, and Anna Popova. "VARIATIONS OF ACORN MORPHOLOGICAL PARAMETERS IN THE VORONEZH REGION." In Modern problems of animal and plant ecology. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2021. http://dx.doi.org/10.34220/mpeapw2021_50-55.

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The acorn morphometric analysis was carried out. Acorns of Quercus robur collected in populations of the Shilovo, Krasnolesnyy, BSSC «Maklok», Shipov forest. The indicators of acorn were weight, in g., acorn length and width, in cm. The widest limits of variation in weight, length, and diameter are observed in acorns from the experimental territory «Shipov forest»: from 0.55 to 10.43 g, from 1.52 to 4.7 cm, and from 0.86 to 2.31 cm, respectively. The smallest differences between the maximum and minimum weight (from 1.53 to 5.48 g) and the diameter (from 1.1 to 1.69 cm) are observed in the expe
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