A morphometric analysis of hybrid salamanders (genus Ambystoma) and their progenitors on Kelleys Island in Lake Erie

1989 ◽  
Vol 67 (10) ◽  
pp. 2376-2383 ◽  
Author(s):  
Clifford W. Zeyl ◽  
Leslie A. Lowcock
Keyword(s):  
Morphometric Analysis ◽  
Principal Components ◽  
Lake Erie ◽  
Meristic Character ◽  
Discriminant Functions ◽  
Morphometric Characters ◽  
Size And Shape ◽  
Canonical Variates

Six morphometric characters and one meristic character were measured on 96 adult and 88 juvenile Ambystoma from Kelleys Island, where extensive hybridization involves three species. Canonical variates, discriminant functions, and size-constrained principal components analyses showed that A. laterale (represented only in hybrids on Kelleys Island), A. texanum, A. tigrinum, and A. laterale–texanum–tigrinum are distinguishable from each other and from a complex of hybrids involving A. texanum and A. laterale. Within the latter complex, different ploidies are not distinct morphologically. Introgression may explain isolated atypical individuals. Adults differ from juveniles in both size and shape, demonstrating allometry.

scholarly journals Morphological evaluation of common bean diversity in Bosnia and Herzegovina using the discriminant analysis of principal components (DAPC) multivariate method

Genetika ◽  
2013 ◽  
Vol 45 (3) ◽  
pp. 963-977 ◽  
Author(s):  
Jasmin Grahic ◽  
Fuad Gasi ◽  
Mirsad Kurtovic ◽  
Lutvija Karic ◽  
Mirha Djikic ◽  
...  
Keyword(s):  
Discriminant Analysis ◽  
Common Bean ◽  
Bosnia And Herzegovina ◽  
Principal Components ◽  
Morphological Characteristics ◽  
Principal Component ◽  
Discriminant Functions ◽  
Factor Loadings ◽  
Geographical Regions ◽  
High Level

In order to analyze morphological characteristics of locally cultivated common bean landraces from Bosnia and Herzegovina (B&H), thirteen quantitative and qualitative traits of 40 P. vulgaris accessions, collected from four geographical regions (Northwest B&H, Northeast B&H, Central B&H and Sarajevo) and maintained at the Gene bank of the Faculty of Agriculture and Food Sciences in Sarajevo, were examined. Principal component analysis (PCA) showed that the proportion of variance retained in the first two principal components was 54.35%. The first principal component had high contributing factor loadings from seed width, seed height and seed weight, whilst the second principal component had high contributing factor loadings from the analyzed traits seed per pod and pod length. PCA plot, based on the first two principal components, displayed a high level of variability among the analyzed material. The discriminant analysis of principal components (DAPC) created 3 discriminant functions (DF), whereby the first two discriminant functions accounted for 90.4% of the variance retained. Based on the retained DFs, DAPC provided group membership probabilities which showed that 70% of the accessions examined were correctly classified between the geographically defined groups. Based on the taxonomic distance, 40 common bean accessions analyzed in this study formed two major clusters, whereas two accessions Acc304 and Acc307 didn?t group in any of those. Acc360 and Acc362, as well as Acc324 and Acc371 displayed a high level of similarity and are probably the same landrace. The present diversity of Bosnia and Herzegovina?s common been landraces could be useful in future breeding programs.

scholarly journals Sexual differences in size and shape of the Mosor rock lizard [Dinarolacerta mosorensis (Kolombatovic, 1886)] (squamata: lacertidae): A case study of the Lovcen mountain population (Montenegro)

2008 ◽  
Vol 60 (2) ◽  
pp. 279-288 ◽  
Author(s):  
Katarina Ljubisavljevic ◽  
Lidija Polovic ◽  
Ana Ivanovic
Keyword(s):  
Sexual Differences ◽  
Size Difference ◽  
Morphometric Characters ◽  
Positive Allometry ◽  
Size And Shape ◽  
Rock Lizard ◽  
Head Height ◽  
Dorsal Pattern ◽  
Mountain Population

Sexual differences in size and shape of the Mosor rock lizard, Dinarolacerta mosorensis (Kolombatovic, 1886), from Lovcen Mountain (Montenegro) were examined on the basis of the intersex variation pattern of nine morphometric, eight pholidotic, and four qualitative traits. Sexual dimorphism was apparent for all morphometric characters except snout-vent length, while scalation and dorsal pattern exhibited small differences between sexes. The value of the sexual size difference (SSD) index based on snout-vent length was 1.028. The sex-specific allometric slopes for head dimensions and interlimb distance significantly diverged. Head dimensions, especially head height, showed strong positive allometry in males, while interlimb distance was the only character which showed positive allometry in females. Generally, males had significantly greater body size than females. This was true of all body measurements except interlimb distance. The influence of sexual and natural selection on the examined traits is discussed.

scholarly journals PRIMATA BESAR DI JAWA: SPESIMEN BARU GIGANTOPITHECUS DARI SEMEDO

2016 ◽  
Vol 36 (2) ◽  
pp. 141-160 ◽  
Author(s):  
Sofwan Noerwidi
Keyword(s):  
Morphometric Analysis ◽  
Research Problem ◽  
Homo Erectus ◽  
Taxonomic Position ◽  
Tropical Environment ◽  
High Latitudes ◽  
Comparison Study ◽  
Species Identity ◽  
Morphometric Characters ◽  
Very High

In 2014 there was found two "enigmatic" specimens of mandible, which named as Semedo 3417 and 3418. Both mandibles are morphologically similar but twice bigger than common primate’s jaw. In this research, we use morphology and morphometric analysis to determine the species identity and taxonomic position of those specimens. For comparison study we use some samples from Homo erectus (Java and China), Gigantopithecus (blacki and bilaspurensis), Australopithecines (robust and gracile). Based on morphology and morphometric characters on the mandible and teeth, it is concluded that Semedo specimen tends to be close to Gigantopithecus blacki. The discoveries of Gigantopithecus fossil in Java has implication on some research problem, especially regarding the adaptation pattern of this species which known only found at high latitudes environment. Furthermore this discovery has reinforced the perspective that tropical environment has a very high biodiversity, particularly on primate fossils.

Problems of compensative fisheries: increasing the adaptive potential of broad whitefish Coregonus nasus (Pallas) in early ontogenesis by weak magnetic fields. 1. Morphometric analysis

2020 ◽  
pp. 32-46
Author(s):  
Alexander Germanovich Selyukov ◽  
Ekaterina Vladimirovna Efremova ◽  
Svetlana Aleksandrovna Selyukova ◽  
Leonid Alexandrovich Shuman
Keyword(s):  
Magnetic Fields ◽  
Morphometric Analysis ◽  
Juvenile Fish ◽  
Morphological Characters ◽  
Control Treatment ◽  
Physical Factors ◽  
Morphometric Characters ◽  
Ob River ◽  
Biological Potential ◽  
Organ Systems

The article presents the results of a production experiment with the embryos of Coregonus nasus, delivered at the Sobsk fish hatchery (settlement Kharp, YaNAO). The plant is taking compensatory measures to restore the number of valuable species of whitefishes in the Ob river basin. The purpose of our study was to increase the biological potential of juvenile broad whitefish for their subsequent release to the Ob river. At the last stage of the embryonic period, the embryos were treated with ultra-weak pulsed magnetic fields for several days. In the postembryonic period, the control and experimental juveniles of broad whitefish were fixed for subsequent morphometric and cytological-histological analysis. After conducting a morphometric analysis, we found that already at the early stages of the postembryonic period, the experimental larvae and fry exceeded the control ones in most parameters. Later, these differences persisted. At the same time, the juveniles of the experimental batch showed, as a rule, less variability of morphological characters. Also, the weight of the experimental fry before release to the Ob significantly exceeded the weight of the control fry. We calculated the degree of correlation of morphometric characters in juvenile broad whitefish of both parties in the process of rearing and found that during the first month the correlation of most parameters in the experimental juveniles was lower than in the control. However, with further development, the degree of relationship between the parameters in juveniles in the experiment increased and reached it in the control. Later, the allometric growth of the experimental juveniles began, which caused a decrease in the connection between some characters. We are discussing the features of the development of experimental juvenile fish; activation of its natural mechanisms of autorehabilitation by using weak physical factors. We explain the reasons for the stable, but insignificant differences between the experimental fish fry over the control treatment with an ultra-weak pulsed magnetic field at the last stages of embryogenesis, when the main organ systems are already formed. We conclude that this approach is advisable, starting with fertilization and early embryogenesis.

TAXONOMIC STATUS OF THE ROCKY MOUNTAIN LOCUST: MORPHOMETRIC COMPARISONS OF MELANOPLUS SPRETUS (WALSH) WITH SOLITARY AND MIGRATORY MELANOPLUS SANGUINIPES (F.)

1989 ◽  
Vol 121 (12) ◽  
pp. 1103-1109 ◽  
Author(s):  
Jeffrey A. Lockwood
Keyword(s):  
Morphometric Analysis ◽  
Rocky Mountain ◽  
Taxonomic Status ◽  
Environmental Variation ◽  
Body Measurements ◽  
Melanoplus Sanguinipes ◽  
Morphometric Characters ◽  
The Status ◽  
Solitary Phase

AbstractMorphometric analysis of 16 body measurements of migratory and solitary Melanoplus sanguinipes (F.) and M. spretus (Walsh) was used to determine if M. spretus was, in fact, the migratory phase of M. sanguinipes. Migratory M. sanguinipes was found to be more similar to its own solitary phase than to M. spretus. Melanoplus spretus resembled migratory M. sanguinipes, but in 14 comparisons M. spretus differed significantly from both solitary and migratory M. sanguinipes. Despite the potential for environmental variation obscuring differences in morphology, the divergent morphometric characters of M. spretus and the phases of M. sanguinipes appear to justify the status of M. spretus as a true species.

Hybridization between northern redbelly dace (Phoxinus eos) and finescale dace (Phoxinus neogaeus) (Osteichthyes: Cyprinidae) in Alberta

1989 ◽  
Vol 67 (3) ◽  
pp. 579-584 ◽  
Author(s):  
Mrinal K. Das ◽  
Joseph S. Nelson
Keyword(s):  
Principal Components ◽  
Parental Species ◽  
Introgressive Hybridization ◽  
Morphological Characters ◽  
Allopatric Populations ◽  
Canonical Variates ◽  
Female Hybrid ◽  
Hybrid Group

Hybridization between northern redbelly dace (Phoxinus eos) and finescale dace (Phoxinus neogaeus) was studied in Upper Pierre Grey Lake, Alberta. Sympatric parental and hybrid populations were compared with allopatric populations from Cameron Lake and Tay Lake, Alberta. Canonical variates and principal components analyses, using 31 morphological characters, revealed that the two parental groups were bridged by an intermediate all-female hybrid group in Upper Pierre Grey Lake. Hybrids made up approximately 33% of the individuals of the sympatic population. Neither backcross nor hybrid F2 individuals could be identified from the analyses, although the majority of hybrids were morphologically more similar to P. neogaeus than to P. eos. No clear evidence of introgressive hybridization was found in either of the sympatric parental species.

Bursaria (Pittosporaceae): a morphometric analysis and revision

1999 ◽  
Vol 12 (1) ◽  
pp. 117 ◽  
Author(s):  
L. W. Cayzer ◽  
M. D. Crisp ◽  
I. R. H. Telford
Keyword(s):  
Morphometric Analysis ◽  
Morphometric Characters ◽  
Eastern Australia ◽  
Infraspecific Taxa

Bursariais an endemic Australian genus of mostlyspinescent, scruffy shrubs and trees, found in all but the most arid or alpineareas. Previous classifications include many infraspecific taxa and haveproved unworkable in eastern Australia. This paper presents a revision of thegenus. On the basis of phenetic analyses of morphometric characters thefollowing taxa are now recognised: B. calcicolaL.Cayzer, Crisp & I.Telford, B. incana Lindl.,B. longisepala Domin,B. occidentalis E.M.Benn.,B. reevesii L.Cayzer, Crisp & I.Telford,B. spinosa Cav. subsp. lasiophylla (E.M.Benn.) L.Cayzer, Crisp & I.Telford, B. spinosasubsp. spinosa and B. tenuifoliaF.M.Bail. Two are described as new(B. calcicola, B. reevesii), and one is changed in rank:B. spinosa subsp. lasiophylla(formerly B. lasiophylla E.M.Benn.). None of the otherinfraspecific taxa recognised previously is supported by our analyses.

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