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Journal articles on the topic 'Morphological variation'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 March 2023

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1

van Hinsberg, A. "Morphological variation in." Journal of Evolutionary Biology 10, no. 5 (1997): 687. http://dx.doi.org/10.1007/s000360050049.

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JIA, Lin, Yun-Dong SHI, Hong YU, and Shu-Ying LI. "Morphological Variation inCymbidium tortisepalum." Plant Science Journal 31, no. 1 (2013): 93. http://dx.doi.org/10.3724/sp.j.1142.2013.10093.

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3

Sterling, Tracy M., Leigh W. Murray, and Yanglin Hou. "Morphological variation amongGutierrezia sarothraepopulations." Weed Science 48, no. 3 (May 2000): 356–65. http://dx.doi.org/10.1614/0043-1745(2000)048[0356:mvagsp]2.0.co;2.

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4

Davis, Jerrold I., and Amy Jean Gilmartin. "Morphological Variation and Speciation." Systematic Botany 10, no. 4 (October 1985): 417. http://dx.doi.org/10.2307/2419135.

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5

Fábregas, Antonio, and Ángel J. Gallego. "Morphological variation in Spanish." Lingua 151 (November 2014): 97–119. http://dx.doi.org/10.1016/j.lingua.2014.09.007.

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6

van de Weijer, Jeroen, and Tetsuo Nishihara. "Morphological variation in Japanese." Lingua 120, no. 10 (October 2010): 2319–22. http://dx.doi.org/10.1016/j.lingua.2010.03.025.

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7

Nielsen, Ruth. "Morphological variation ofStromatella monostromatica." Helgoländer Meeresuntersuchungen 42, no. 3-4 (September 1988): 427–34. http://dx.doi.org/10.1007/bf02365619.

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8

Costa, H. S., D. M. Westcot, D. E. Ullman, R. Rosell, J. K. Brown, and M. W. Johnson. "Morphological variation inBemisia endosymbionts." Protoplasma 189, no. 3-4 (September 1995): 194–202. http://dx.doi.org/10.1007/bf01280174.

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9

Chaudhari, Milind, and Asif Hasan. "Distal Aortopulmonary Window: A Morphological Variation." Asian Cardiovascular and Thoracic Annals 17, no. 4 (August 2009): 413–14. http://dx.doi.org/10.1177/0218492309345214.

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10

L. Anbumani, T. N. Pavazhakkurinji, and A. Thamaraiselvi. "MORPHOLOGICAL STUDY ON VARIATION OF EXTERNAL SURFACE OF LIVER." International Journal of Anatomy and Research 8, no. 2.2 (May 5, 2020): 7481–85. http://dx.doi.org/10.16965/ijar.2020.140.

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11

Hoffman, David L., F. J. Muehlbauer, and G. Ladizinsky. "Morphological Variation in Lens (Leguminosae)." Systematic Botany 13, no. 1 (January 1988): 87. http://dx.doi.org/10.2307/2419244.

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12

YASODAI, R., DR SHIVAKUMAR A.H, DR S. RAJASHANKAR., and M. VEERAMUTHU. "MORPHOLOGICAL VARIATION OF FORAMEN MAGNUM." International Journal of Advanced Research 4, no. 6 (June 30, 2016): 387–91. http://dx.doi.org/10.21474/ijar01/651.

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13

McCarthy, Corrine. "Modeling morphological variation and development." Linguistic Approaches to Bilingualism 2, no. 1 (February 10, 2012): 25–53. http://dx.doi.org/10.1075/lab.2.1.02mcc.

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This paper proposes a model of morphological variation and development grounded in feature-geometric theory. It tests two hypotheses that follow from this model on a corpus of data from speakers of Spanish as a second language (L2). First, variation is systematic; default, underspecified feature values are adopted when errors occur. This hypothesis is supported for person, number, and finiteness, as 3rd, singular, and nonfinite defaults surface in place of 1st, plural, and finite verbs. Second, developmental trends are observed as nodes are added to the geometry; the unmarked/less specified feature value is successfully produced prior to the marked/more specified one. This hypothesis is partially supported, as accuracy in 3rd person emerges prior to 1st. However, no developmental pattern is found for number. Errors in finiteness are limited to lower-proficiency speakers, whereas intermediate speakers favor 3rd person, finite defaults. Together, these results suggest systematic variation and gradual development in the morphology.
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14

SHUBIN, NEIL, and DAVID WAKE. "Phytogeny, Variation, and Morphological Integration." American Zoologist 36, no. 1 (February 1996): 51–60. http://dx.doi.org/10.1093/icb/36.1.51.

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15

Edmondson, W. T., and Arni H. Litt. "Morphological variation in Kellicottia longispina." Hydrobiologia 186-187, no. 1 (December 1989): 109–17. http://dx.doi.org/10.1007/bf00048902.

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16

DITTER, ROBERT E., ROBERT B. ERDMAN, ANNA M. GOEBEL, and HEATHER D. BRACKEN-GRISSOM. "Widespread phenotypic hypervariation in the enigmatic anchialine shrimp Barbouria cubensis (Decapoda: Barbouriidae)." Zootaxa 4648, no. 1 (July 29, 2019): 1–26. http://dx.doi.org/10.11646/zootaxa.4648.1.1.

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Classification and evolutionary relationships among anchialine shrimp from the family Barbouriidae Christoffersen, 1987, has long been a topic of debate amongst crustacean taxonomists. To date, no study has examined morphological or molecular variation among populations of these enigmatic shrimp. The present study documents and analyzes patterns of widespread morphological variation within populations of Barbouria cubensis von Martens, 1872, from anchialine pools on three Bahamian islands. Such extensive morphological variation confounds identification using classic taxonomical methods. Phenotypic variation is by no means a new topic, but studies of decapods are typically limited to isolated individuals or few morphological characters. Moreover, past studies of B. cubensis do not report extensive morphological variation, however we find that upwards of 90% of individuals are affected. Anomalous phenotypes are described in 54 morphological characters with no detectable pattern associated with geographic distribution. The term phenotypic hypervariation (PhyV) is used to describe morphological variation that greatly deviates from any previous taxonomic descriptions. Analysis of partial sequences of the 16S and COI mitochondrial genes confirm the identity of morphologically variable specimens as B. cubensis without population structure across the tropical western Atlantic. A test for cryptic diversity within B. cubensis suggests PhyV is not correlated with cryptic diversity. Morphological variation at this scale likely depends on recent changes either to their environment or genetic diversity.
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17

Kolbe, Sarah E., Rowan Lockwood, and Gene Hunt. "Does morphological variation buffer against extinction? A test using veneroid bivalves from the Plio-Pleistocene of Florida." Paleobiology 37, no. 3 (2011): 355–68. http://dx.doi.org/10.1666/09073.1.

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Although morphological variation is known to influence the evolutionary fates of species, the relationship between morphological variation and survivorship in the face of extinction-inducing perturbations is poorly understood. Here, we investigate this relationship for veneroid bivalves in association with the Plio-Pleistocene extinction in Florida. Fourteen pairs of related species were selected for analysis, with each pair including one species that survived the Plio-Pleistocene extinction and another that became extinct during the interval. Morphological landmark data were acquired for more than 1500 museum specimens, representing 19 localities that encompass four well-known Plio-Pleistocene units in the study region. Procrustes superimposition was applied to each sample, and overall multivariate variation was calculated as the mean squared partial Procrustes distance between specimens and their mean form. Morphological variation was calculated at three geographic scales for each species, and differences in variation between survivors and victims were examined within each species pair. Results indicate that species surviving the Plio-Pleistocene extinction were significantly more variable morphologically than victims. Greater morphological variation may promote survivorship by directly enhancing species adaptations to changing conditions or by permitting the occupation of a larger geographic range. Alternatively, high morphological variation and survivorship may both be mediated by a third variable, such as large geographic range.
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18

Mayer, Stephanie S. "Morphological Variation in Hawaiian Wikstroemia (Thymelaeaceae)." Systematic Botany 16, no. 4 (October 1991): 693. http://dx.doi.org/10.2307/2418871.

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19

Talbott, Harriet G., Richard A. Wilkins, Anthony C. Redmond, Claire L. Brockett, and Marlène Mengoni. "Morphological variation of the hemophilic talus." Clinical Anatomy 34, no. 6 (May 25, 2021): 941–47. http://dx.doi.org/10.1002/ca.23757.

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20

Passos, Paulo, Lourdes Y. Echevarría, and Pablo J. Venegas. "Morphological Variation ofAtractus carrioni(Serpentes: Dipsadidae)." South American Journal of Herpetology 8, no. 2 (August 2013): 109–20. http://dx.doi.org/10.2994/sajh-d-12-00025.1.

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21

Shrestha, Jiban. "Morphological variation in maize inbred lines." International Journal of Environment 3, no. 2 (May 30, 2014): 98–107. http://dx.doi.org/10.3126/ije.v3i2.10521.

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In order to identify morphological variation in maize inbred lines, one hundred five inbred lines were planted under randomized complete block design with two replications at research field of National Maize Research Program, Rampur, Chitwan, Nepal during summer season (March to June), 2010. Descriptive statistics and cluster analysis were done. The results revealed a wide range of morphological variation among the tested inbred lines. The inbred lines grouped in cluster 4 namely PUTU-13, L-9, RL-105, RL-197, RL-103, RML-9, RML-41, RL-165, RL-36, RL-76, RL-125, RL-30-3, L-6, RL-107, RL-174, RL-41, L-13, RML-76 and L-5 had 0.833 days anthesis-silking interval and earlier in flowering (tasseling in 54.50 days and silking in 55.33 days). Moreover they consisted of 1.16 plant aspect, 1.25 ear aspect, 33.08 cm tassel length and 13.5 tassel branch number. Among tested lines, the above inbred lines had better morphological traits, so it was concluded that they were good candidates for development of hybrids and synthetic varieties. DOI: http://dx.doi.org/10.3126/ije.v3i2.10521 International Journal of the Environment Vol.3(2) 2014: 98-107
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22

MICHAUX, B. "Morphological variation of species through time." Biological Journal of the Linnean Society 38, no. 3 (November 1989): 239–55. http://dx.doi.org/10.1111/j.1095-8312.1989.tb01577.x.

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23

Arase, S., Y. Katano, X. Li, Y. Honda, and M. Nozu. "Morphological Variation in Spores ofPyricularia oryzaeCavara." Journal of Phytopathology 142, no. 4 (December 1994): 253–57. http://dx.doi.org/10.1111/j.1439-0434.1994.tb00020.x.

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24

Caradus, J. R., and A. C. Mackay. "Morphological and flowering variation ofTrifolium dubiumSibth." New Zealand Journal of Agricultural Research 32, no. 2 (April 1989): 129–32. http://dx.doi.org/10.1080/00288233.1989.10423445.

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25

Hyun, Chang Woo, and Young Dong Kim. "Morphological Variation of Berberis amurensis Complex." Korean Journal of Plant Taxonomy 38, no. 2 (June 30, 2008): 93–109. http://dx.doi.org/10.11110/kjpt.2008.38.2.093.

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26

Tamminga, Meredith. "Persistence in phonological and morphological variation." Language Variation and Change 28, no. 3 (October 2016): 335–56. http://dx.doi.org/10.1017/s0954394516000119.

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AbstractPersistence, the tendency to repeat a recently used variant in speech, has been observed for a range of sociolinguistic variables. This paper uses quantitative data from ING and TD in Philadelphia English to show that persistence reflects morphological structure and can therefore be a useful tool for defining variables at the phonology–morphology interface. For both ING and TD, persistence arises only when prime and target belong to the same morphological category, with additional interactions between morphological category and lexical repetition. This pattern of results suggests that both the linguistic variables and cognitive processes at play are multifactorial.
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27

Bedigian, Dorothea, C. A. Smyth, and Jack R. Harlan. "Patterns of morphological variation insesamum indicum." Economic Botany 40, no. 3 (July 1986): 353–65. http://dx.doi.org/10.1007/bf02858991.

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28

Terada, Katsuyuki. "Morphological variation in Laboulbenia polymorpha (Laboulbeniales)." Mycoscience 45, no. 5 (October 2004): 324–32. http://dx.doi.org/10.1007/s10267-004-0190-z.

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29

Staiger, Elizabeth A., Rebecca R. Bellone, Nathan B. Sutter, and Samantha A. Brooks. "Morphological Variation in Gaited Horse Breeds." Journal of Equine Veterinary Science 43 (August 2016): 55–65. http://dx.doi.org/10.1016/j.jevs.2016.04.096.

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30

Kokkini, S., and D. Babalonas. "Morphological variation in Nepeta nuda L." Feddes Repertorium 93, no. 1-2 (April 18, 2008): 71–76. http://dx.doi.org/10.1002/fedr.19820930110.

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31

Alqahtani, Abdulaziz R., Ahmed Badry, Fahd Mohammed Abd Al Galil, and Zuhair S. Amr. "Morphometric and meristic diversity of the species Androctonus crassicauda (Olivier, 1807) (Scorpiones: Buthidae) in Saudi Arabia." PeerJ 10 (October 19, 2022): e14198. http://dx.doi.org/10.7717/peerj.14198.

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Intraspecific molecular and morphological variations among geographically isolated populations are useful for understanding the evolutionary processes, which is considered early stage of allopatric speciation. Also, the knowledge of the regional variation of scorpion venom composition is needed to improve antivenom therapeutic management. Androctonus crassicauda (Olivier, 1807) is the most common and medically important species in Arabia and the Middle East. Therefore, this study aimed to investigate the geographic morphological variation among A.crassicaudapopulations, regarding its geographical distribution in unexplored arid regions in Saudi Arabia. Samples were collected and examined morphologically under a dissecting microscope from different four eco-geographical regions. The results of ANOVA and multivariate statistical analyses provide strong evidence of geographical variation. The two populations from OTU3 and OUT4 showed the greatest degree of morphological difference from populations of OUT1 and OUT2. Each OTU3 and OTU4 populations showed significant speciation without overlapping in the two groups, while the remaining overlapped groups comprised two other populations. Several body variables influenced male separation, including carapace posterior width, metasoma 3rd length, and metasoma 2nd length. For females, telson length, metasoma 1st width, and sternite 7th width were highly influential variables. Such variation may suggest the existence of cryptic taxa within A. crassicauda populations in Saudi Arabia. Moreover, metasoma ratios can be used as good indicators in intraspecific variation studies of Scorpions.
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32

Eckhardt, Robert B., and Reiner Protsch von Zieten. "Morphological variation in the nasal region of extant and fossil hominids." Zeitschrift für Morphologie und Anthropologie 78, no. 2 (November 30, 1990): 211–16. http://dx.doi.org/10.1127/zma/78/1990/211.

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33

Munda, Ivka M., and Bruno P. Kremer. "Morphological variation and population structure of Fucus spp. (Phaeophyta) from Helgoland." Nova Hedwigia 64, no. 1-2 (February 17, 1997): 67–86. http://dx.doi.org/10.1127/nova.hedwigia/64/1997/67.

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34

Lammert, Adam, Michael Proctor, and Shrikanth Narayanan. "Morphological Variation in the Adult Hard Palate and Posterior Pharyngeal Wall." Journal of Speech, Language, and Hearing Research 56, no. 2 (April 2013): 521–30. http://dx.doi.org/10.1044/1092-4388(2012/12-0059).

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Purpose Adult human vocal tracts display considerable morphological variation across individuals, but the nature and extent of this variation has not been extensively studied for many vocal tract structures. There exists a need to analyze morphological variation and, even more basically, to develop a methodology for morphological analysis of the vocal tract. Such analysis will facilitate fundamental characterization of the speech production system, with broad implications from modeling to explaining interspeaker variability. Method A data-driven methodology to automatically analyze the extent and variety of morphological variation is proposed and applied to a diverse subject pool of 36 adults. Analysis is focused on two key aspects of vocal tract structure: the midsagittal shape of the hard palate and the posterior pharyngeal wall. Result Palatal morphology varies widely in its degree of concavity but also in anteriority and sharpness. Pharyngeal wall morphology, by contrast, varies mostly in terms of concavity alone. The distribution of morphological characteristics is complex, and analysis suggests that certain variations may be categorical in nature. Conclusion Major modes of morphological variation are identified, including their relative magnitude, distribution, and categorical nature. Implications of these findings for speech articulation strategies and speech acoustics are discussed.
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35

Suttill, Terri A., and Geraldine A. Allen. "Morphological and chromosomal variation in Dodecatheon pulchellum (Primulaceae)." Canadian Journal of Botany 70, no. 12 (December 1, 1992): 2476–83. http://dx.doi.org/10.1139/b92-306.

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Dodecatheon pulchellum (Raf.) Merr. is a widespread and morphologically variable species of western North America. Analysis of morphological variation, combined with chromosome counts and evidence from a transplant study, showed this species to consist of two subspecies. Subspecies cusickii is pubescent, mainly diploid, and occurs in the drier parts of the species range. The more variable ssp. pulchellum is glabrous to sparsely pubescent, mainly polyploid, and is widely distributed. Within ssp. pulchellum, three varieties can be recognized: the tall, many-flowered var. alaskanum, of wet, low-elevation habitats; the diminutive var. watsonii, generally of alpine habitats; and the intermediate and widely distributed var. pulchellum. Common garden studies indicate that size differences among these varieties have a genetic basis and that ecological differences exist in D. pulchellum even among morphologically similar forms. Key words: Dodecatheon, Primulaceae, systematics, morphology, chromosome numbers, common garden studies.
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36

Russell, G. E. Gibbs, and J. J. Spies. "Variation in important pasture grasses: I. Morphological and geographical variation." Journal of the Grassland Society of Southern Africa 5, no. 1 (January 1988): 15–21. http://dx.doi.org/10.1080/02566702.1988.9648103.

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37

Austin, CM, and B. Knott. "Systematics of the Freshwater Crayfish Genus Cherax Erichson (Decapoda: Parastacidae) in South-Western Australia: Electrophoretic, Morphological and Habitat Variation." Australian Journal of Zoology 44, no. 3 (1996): 223. http://dx.doi.org/10.1071/zo9960223.

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A detailed study of electrophoretic, morphological and habitat variation amongst species of Cherax in south-western Australia supported the recognition of only five of the eight species currently recognised and revealed that morphological and habitat variation within these crayfish is more extensive and complicated than was previously realised. Within several species morphological and habitat variation was found to be as great as that between species. Furthermore, a major component of the morphological variability, both within and between species, was found to be associated with habitat variation. Three of the five species of Cherax recognised in this study correspond to the consistently recognised and widespread species, C. preissii Erichson, C. quinquecarinatus (Gray) and C. tenuimanus Smith. The two other species are C. crassimantus Riek and C. glaber Riek which have restricted distributions in the extreme south-west of Western Australia. The species C. glabrimanus Riek and C. neocarinatus Riek could not be distinguished from C. quinquecarinatus, nor could C. plebejus (Hess) be distinguished from C. preissii. On a general level, the results of this study question the value of morphological information in systematic studies of freshwater crayfish. Morphologically based taxonomic studies of freshwater crayfish need to be interpreted with caution because, firstly, taxonomic characters may be far more variable than realised; secondly, morphological and habitat differences cannot necessarily be equated with specific distinctions; and thirdly, genetically distinct species that occupy similar habitats need not be morphologically distinct.
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38

Cunha, Andressa Maria, Mariana Terossi, Fernando Luis Mantelatto, and Alexandre Oliveira Almeida. "Genetic variation and cryptic diversity of the." Marine and Freshwater Research 73, no. 3 (November 22, 2021): 319–27. http://dx.doi.org/10.1071/mf21043.

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Alpheus lobidens sensu lato is one of the most common groups of snapping shrimps in the Indo-West Pacific. The objective of this study was to investigate the phylogenetic relationships among lineages of A. lobidens s.l. throughout their geographical distribution and identifying possible morphological characteristics that support the lineages from this combined dataset. Molecular data were obtained by analysing 16S rRNA from nine individuals of A. lobidens, three of A. buckupi, one of A. inopinatus and six other Alpheus species. The genetic analyses (mean p-distance and Bayesian Inference) indicate considerable genetic divergence and at least nine lineages within the A. lobidens species complex. The high morphological variability observed in Alpheus spp. and the high rates of interspecific genetic divergence agree with the Marine Ecoregions of the World and ocean currents, which suggests limited gene flow among those lineages, indicating that these could be treated as new species. However, as no informative morphological characters were identified, describing the six new taxa of the complex recognised in this study was unfeasible. Future studies using a higher number of specimens and applying more sensitive methods for detecting structural differences, might help morphologically define the new species that were uncovered herein.
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39

López-Borja, Edgar Noel, Rosa De Lourdes Romo-Campos, Hilda Julieta Arreola-Nava, Alejandro Muñoz Urias, and Sofía Loza-Cornejo. "Morphological variation in Opuntia jaliscana (Cactaceae)." Anales del Jardín Botánico de Madrid 74, no. 1 (June 26, 2017): 058. http://dx.doi.org/10.3989/ajbm.2431.

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The aim of this study was to describe morphological variations of Opuntia jaliscana in 5 wild populations in the state of Jalisco (Mexico). Populations were selected along an environmental aridity gradient, and 61 vegetative and reproductive characters from 25 individuals were measured per population. Quantitative characters were analyzed independently by a one-way ANOVA test using the site as variation factor. Subsequently, a discriminant analysis was performed. The discriminant analysis results showed that the 46% of the total variation was explained by the first four discriminant functions. The analysis of overall membership between populations indicated that individuals were correctly classified in 87% of cases. Pearson linear correlation between the most significant variables and the aridity index, showed a positive relationship to cladode thickness and diameter of the trunk. The population from Tierra Blanca shows an outlier behavior because of variation in cladode thickness and fruit size, which might be related to plasticity of individuals to have a greater availability of water, while in Los Vallejo the separation might be due to selection by management and use. The remaining populations exhibited some morphological variability without separation.
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40

Elgmork, Kåre, and Gunnar Halvorsen. "Intraspecific morphological variation in a freshwater copepod (Crustacea) in relation to geographic distribution and environment." Canadian Journal of Zoology 76, no. 4 (April 1, 1998): 751–62. http://dx.doi.org/10.1139/z97-204.

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Intraspecific variation in morphology was studied by means of morphometric analysis in 52 populations of the freshwater planktonic copepod Cyclops scutifer G.O. Sars from Eurasia and North America. The species showed very conservative morphology over wide geographic areas and subspecies could not be established. Variations occurred irregularly, and morphologically very similar forms were found widely separated on different continents. Correlation analysis revealed that many morphological relations were correlated with environmental factors such as depth, temperature, and trophic condition. Variations in body proportions were thus related to environmental factors rather than to geographic distance.
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Drapikowska, Maria. "Variability of Anthoxanthum species in Poland in relation to geographical-historical and environmental conditions: morphological and anatomical variation." Biodiversity: Research and Conservation 30, no. 1 (June 1, 2013): 3–61. http://dx.doi.org/10.2478/biorc-2013-0010.

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Abstract Three Anthoxanthum species are found in Poland: the native A. odoratum L. s. str. and A. alpinum Á. Löve & D. Löve, and the alien A. aristatum Boiss. Major problems within this genus concern: (1) population variation of the native A. odoratum, representing various phases of ecological expansion to anthropogenic habitats; (2) population variation of A. odoratum and A. alpinum along the altitudinal transect; and (3) variation between populations of A. aristatum colonizing new areas and habitats outside its natural range of distribution (chorological expansion). In this study, morphological and anatomical variation of the three Polish Anthoxanthum species was analysed in detail. The variation of A. odoratum and A. aristatum was analysed in respect of environmental differences: habitat types and soil parameters. In the Babia Góra massif, variability distribution along the altitudinal transect was analysed for two vicariants: A. odoratum and A. alpinum. A odoratum in this massif does not cross the upper forest limit (i.e. forest line), and lower montane populations are morphologically very similar to lowland populations. Morphological and anatomical differences were detected between populations of A. alpinum along the altitudinal transect in the Babia Góra massif, with distinct upper montane populations. Moreover, clear morphological differences were found between the two altitudinal vicariants. Lowland populations of A. odoratum are characterized by great morphological variation, only weakly correlated with the type of occupied habitat and the phase of ecological expansion. The detected morphological variation reflects only to a limited extent the environmental variation of occupied habitats, and is not significantly correlated with the phase of chorological expansion. Some soil parameters are significantly correlated with some morphological characters studied in all the Anthoxanthum species. The analysed anatomical features of stems and leaves show continuous variation in the three species.
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42

González-Díaz, Alfonso A., Karem F. Ramírez-Moreno, Wilfredo A. Matamoros, Miriam Soria-Barreto, and Rocío Rodiles-Hernández. "Geometric morphometric comparison of the oral jaw and lower pharyngeal jaw of the closely-related cichlid, Vieja bifasciata, V. breidohri and V. hartwegi (Cichliformes: Cichlidae)." Revista Mexicana de Biodiversidad 93 (April 5, 2022): e933861. http://dx.doi.org/10.22201/ib.20078706e.2022.93.3861.

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Systematics of the genus Vieja is complex, with many morphologically similar species that have little genetic differentiation. Examination of additional morphological traits can be useful for clarifying their taxonomic status and evolutionary history. We analyzed morphological variation of bones in the oral jaw and lower pharyngeal jaw to determine if these structures permit delimitation of species and to study possible functional implications. Morphological differences were quantified from canonical variates analysis, MANOVA, and paired comparisons. Differences in the number of pharyngeal teeth in the lower pharyngeal jaw were determined using an ANCOVA. The shape of the premaxilla and lower pharyngeal jaw are best for differentiating between these closely related-species. Although the morphological variation between V. breidohri and V. hartwegi were most similar, the shape of the lower pharyngeal jaw contrasts in morphospace. Vieja bifasciata possesses more teeth in the lower pharyngeal jaw. Variation in this bones may effect jaw biomechanics. Morphological differences are in contrast with the little genetic differentiation observed. The geographic isolation of V. bifasciata is likely related to its morphological differentiation. The common ancestry of V. breidohri and V. hartwegi probably explains their small morphological divergence.
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Andrés-Agustín, J., R. Nieto-Ángel, A. F. Barrientos-Priego, M. T. Martínez-Damián, F. González-Andrés, S. D. Segura-Ledesma, J. G. Cruz-Castillo, and C. Gallegos-Vázquez. "VARIACIÓN MORFOLÓGICA DE LA HOJA DEL CHIRIMOYO." Revista Chapingo Serie Horticultura X, no. 2 (December 2004): 103–10. http://dx.doi.org/10.5154/r.rchsh.2003.10.065.

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44

K., Anupama, Shameem Shariff, and Shetty Shailaja. "Morphological variation of the kidneys with its pathological relevance." National Journal of Clinical Anatomy 05, no. 01 (January 2016): 044–47. http://dx.doi.org/10.1055/s-0039-3401581.

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AbstractKidneys are bean shaped organs with the length of 11cms, breadth of 6cms and thickness of 3cms in antero­ posterior dimension. Variations in morphology of the kidneys are either congenital or acquired. The present paper deals with two cases with abnormal morphology. During routine dissection of abdomen for the under graduate students in MVJ Medical College, Bengaluru, it was found that there were kidneys with morphological variations in two cadavers. Both these specintens were analysed morphologically and sent for histopathological examination. The specinten No: 1 was a case of Ask Upmark kidney and Specinten No: 2 was a case of Granular contracted kidney. Morphological changes in kidney could be congenital or acquired. It is usually associated with various pathologies of kidneys. The pathogenesis is controversial attributed to vesicoureteric reflux with intrarenal reflux or localised developmental arrest, arteriolar nephrosclerosis and glomerulonephritis. The morphology and histopathology of the cases have been discussed.
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Chitra, P. S., and V. Anandhi. "An uncommon morphological variation of coracobrachialis muscle." National Journal of Clinical Anatomy 03, no. 01 (January 2014): 37–38. http://dx.doi.org/10.1055/s-0039-1700712.

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AbstractThe Coracobrachialis muscle in the arm is more important morphologically than functionally. In many animals, the Coracobrachialis has three parts. During the process of evolution the third part has disappeared and only the first two parts are found in man, enclosing the musculocutaneous nerve between them. Morphologic variations of Coracobrachialis have been known for a long time and include accessory slips that attach to the lesser tubercle, medial supracondylar ridge and medial intermuscular septum. The existence of abnormal insertion of the corabrachialis muscle should be kept in mind in a patient presenting with high median nerve palsy together with symptoms of brachial artery compression and before carrying out post-mastectomy reconstruction using coracobrachialis as a transposition flap.
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46

Keeley, Ernest R., Janet L. Loxterman, Sammy L. Matsaw, Zacharia M. Njoroge, Meredith B. Seiler, and Steven M. Seiler. "Morphological and genetic concordance of cutthroat trout (Oncorhynchus clarkii) diversification from western North America." Canadian Journal of Zoology 99, no. 4 (April 2021): 235–48. http://dx.doi.org/10.1139/cjz-2020-0106.

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The cutthroat trout (Oncorhynchus clarkii (Richardson, 1836)) is one of the most widely distributed species of freshwater fish in western North America. Occupying a diverse range of habitats, they exhibit significant phenotypic variability that is often recognized by intraspecific taxonomy. Recent molecular phylogenies have described phylogenetic diversification across cutthroat trout populations, but no study has provided a range-wide morphological comparison of taxonomic divisions. In this study, we used linear- and geometric-based morphometrics to determine if phylogenetic and subspecies divisions correspond to morphological variation in cutthroat trout, using replicate populations from throughout the geographic range of the species. Our data indicate significant morphological divergence of intraspecific categories in some, but not all, cutthroat trout subspecies. We also compare morphological distance measures with distance measures of mtDNA sequence divergence. DNA sequence divergence was positively correlated with morphological distance measures, indicating that morphologically more similar subspecies have lower sequence divergence in comparison to morphologically distant subspecies. Given these results, integrating both approaches to describing intraspecific variation may be necessary for developing a comprehensive conservation plan in wide-ranging species.
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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 (July 7, 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) exhibited the divergences in eight morphometric measurements and eight truss network measurements among the three stocks of T. ilisha. The 1st DFA accounted for 89.8% & 87.4% and the second DFA resolved 10.2% and 12.6%, respectively in morphometric characteristics variation among the group studied. Scattered plotting from PCA and dendogram from cluster analysis (CA) revealed that, the river habitants were morphologically different from the coastal and marine population. Twelve of fifteen morphometric measurements and thirteen of fourteen truss network measurements showed significant differences between T. ilisha and T. toil with significant variation in meristic characters. PCA revealed 89.23% and 88.29% in case of morphometric and truss measurement respectively confirmed high degree of variations in morphological characteristics between two species. Overall, our results based on morphometrics with truss measurements together provide useful information about the morphological differentiation which will be helpful for sustainable exploration and effective management for these two species. Asian J. Med. Biol. Res. June 2020, 6(2): 265-282
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Wood, Brian M., and Mark B. Bain. "Morphology and microhabitat use in stream fish." Canadian Journal of Fisheries and Aquatic Sciences 52, no. 7 (July 1, 1995): 1487–98. http://dx.doi.org/10.1139/f95-143.

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Microhabitat use and body morphology were compared among 15 warmwater stream fishes from the Alabama River (Alabama, U.S.A.) watershed. Morphological variation among separate populations of a species was detected in 14 of the 15 species, indicating that populations should be separated in analyses among species. Comparison of morphological variation between microhabitat generalist and specialist species suggested that all species may vary in morphology relative to their environment. Regression analysis showed that within two families, Cyprinidae and Percidae, morphology was related to specific microhabitat variables. In the Centrarchidae, morphology was not related to any microhabitat variables. Morphological differences among the species occurred along gradients that were similar to gradients of habitat utilization, indicating that within a family, species widely separated in microhabitat use were morphologically different and species using similar microhabitats were similar in morphology. Our results suggest that patterns of morphological variation correspond to properties of the available habitat for warmwater stream fish species.
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Chitra, PS, and V. Anandhi. "An uncommon morphological variation of coracobrachial muscle." National Journal of Clinical Anatomy 3, no. 1 (2014): 37. http://dx.doi.org/10.4103/2277-4025.297365.

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50

Krahl, Kimberly H., Ali Lansari, and Amy F. Iezzoni. "Morphological variation within a sour cherry collection." Euphytica 52, no. 1 (January 1991): 47–55. http://dx.doi.org/10.1007/bf00037856.

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