Geographic variation in morphology of the genus Agamura Blanford, 1874 in Iran

2017 ◽  
Vol 38 (4) ◽  
pp. 449-459 ◽  
Author(s):  
Seyyed Saeed Hosseinian Yousefkhani ◽  
Mansour Aliabadian ◽  
Eskandar Rastegar-Pouyani ◽  
Jamshid Darvish
Keyword(s):  
Geographic Variation ◽  
Function Analysis ◽  
Principal Component ◽  
Morphological Characters ◽  
Correct Classification ◽  
Meristic Characters ◽  
Iranian Plateau ◽  
Different Populations ◽  
Head Height ◽  
Two Populations

The genusAgamurawas previously known from four species occurring on the Iranian Plateau, but was recently revised as a monotypic genus that excluded three species. In the present study, we examined different populations ofAgamura persicamorphologically. We found thatA. persicashows geographic variation with respect to two groups, with the eastern population considered asA. cruralisandA. persicaproposed for the western population. Separation between the two populations ofA. persicawas verified based upon ANOVA results for many morphological characters, including Head Height (HH), Interorbital distance (IO), Forelimb length (FLL), Number of scales across widest part of abdomen (NSA), Loreal scales (LOS), and Number of scales that separate two adjacent tubercles (NTV). Principal Component Analysis (PCA) and Discriminant Function Analysis (DFA) based on metric and meristic characters confirmed the revision of the genusAgamura. Multivariate analysis indicated that all studied OTUs were assigned to the correct classification and have significantly different morphological characters.

scholarly journals Morphological divergence in the anchovy Anchoa januaria (Actinopterygii, Engraulidae) between tropical and subtropical estuarine areas on the Brazilian coast

2018 ◽  
Vol 99 (4) ◽  
pp. 947-955
Author(s):  
Joaquim N. S. Santos ◽  
Rafaela de S. Gomes-Gonçalves ◽  
Márcio de A. Silva ◽  
Ruan M. Vasconcellos ◽  
Francisco G. Araújo
Keyword(s):  
Function Analysis ◽  
Body Height ◽  
Principal Component ◽  
Morphological Characters ◽  
Tropical Region ◽  
Brazilian Coast ◽  
Morphological Divergence ◽  
Subtropical Region ◽  
Meristic Characters ◽  
Head Height

AbstractPhenotypic differentiation among fish populations may be used for management of distinct stocks and helps in conserving biodiversity. We compared morphometric and meristic characters of the anchovy Anchoa januaria from shallow semi-closed bays between the south-eastern (Tropical, 23°S) and southern (Subtropical, 25°S) Brazilian coast. We hypothesized that differences between habitats and environmental conditions result in morphological divergence between conspecific populations. Fish size did not differ significantly between the two areas. Significant differences in the meristic and morphological characters were detected for individuals between the two areas, with specimens from the Subtropical region having significant larger head height, pectoral fin length and eye diameter compared with those from the Tropical region. Conversely, specimens from the Tropical region had significantly larger maxillary length, mouth length and body height than those from the Subtropical region. The number of rays for the dorsal and pectoral fins were higher for the specimens from the Subtropical region, whereas for the anal fin was higher for individuals from the Tropical region. Different morphological groups between the two regions were depicted by principal component analysis and discriminant function analysis, which suggest that morphological divergence is occurring. Local environmental influences and the lack of genetic interchange are likely to be the causes of such divergence. This is facilitated by the low tolerance of this species to marine waters that prevents connectivity between these stocks/populations.

scholarly journals Gammarus Fossarum Koch, 1835: Redescription Based on Neotype Material and Notes on its Local Variation (Crustacea, Amphipoda)

1972 ◽  
Vol 42 (2) ◽  
pp. 124-138 ◽  
Author(s):  
Annemarie Goedmakers
Keyword(s):  
Geographic Variation ◽  
Local Variation ◽  
Morphological Characters ◽  
Gammarus Fossarum ◽  
Different Populations

A redescription of Gammarus fossarum Koch, 1835, is given, together with some notes on the variability in morphological characters of this species, both within one population and in different populations. It is proved through crosses that five morphologically different populations all belong to the same species, G. fossarum. The geographic variation of the various characters is discussed.

scholarly journals Morphological variability of acorns and its taxonomic significance in Quercus. from Turkey

2015 ◽  
Vol 43 (3) ◽  
pp. 293-299 ◽  
Author(s):  
Y Bakis ◽  
MT Babaç
Keyword(s):  
Principal Component Analysis ◽  
Morphological Variability ◽  
Morphological Characteristics ◽  
Principal Component ◽  
Component Analysis ◽  
Morphological Characters ◽  
Taxonomic Significance ◽  
Morphological Variations ◽  
Quercus Species ◽  
Different Populations

Morphological variations of acorn among and within the groups of Quercus species were studied. A total of 617 acorns belonging to 14 species representing all 3 sections of Quercus L. (Fagaceae) in Turkey were examined in this study. Specimens were collected from 47 different populations over both Anatolian and Thrace part of Turkey. Principal component analysis was used to analyze the morphological characteristics of acorns. Results obtained from this study demonstrate the use of morphological characters in differentiating the taxa of Quercus and Cerris sections studied. Another important finding is the introgression among the acorns of species within Quercus section DOI: http://dx.doi.org/10.3329/bjb.v43i3.21601 Bangladesh J. Bot. 43(3): 293-299, 2014 (December)

Variability of leaf blade anatomical traits in the Sesleria juncifolia complex (Poaceae) on the Balkan Peninsula

Phytotaxa ◽  
2020 ◽  
Vol 442 (3) ◽  
pp. 138-152
Author(s):  
TIJANA ĐENADER ◽  
DMITAR LAKUŠIĆ ◽  
NEVENA KUZMANOVIĆ
Keyword(s):  
Cross Sections ◽  
Leaf Blade ◽  
Function Analysis ◽  
A Priori ◽  
Principal Component ◽  
Balkan Peninsula ◽  
Character State ◽  
Adaxial Side ◽  
Qualitative Characters ◽  
Different Populations

This paper presents the results of a detailed study of leaf blade anatomical traits of populations of the Sesleria juncifolia complex from the Balkan Peninsula. The measurements were performed on cross sections of 302 tiller leaf blades from 24 populations. We calculated basic descriptive statistics for each character state. Principal component and canonical discriminant analyses were used to identify the structure of variability and the characters that majorly contributed to the differentiation of the defined groups. Cluster analysis was done to estimate the distances among the studied populations. We provide a detailed description of the leaf blade anatomy of the different populations of S. juncifolia complex investigated within Croatia, Bosnia and Herzegovina, Montenegro, Serbia and North Macedonia. The results show that most of the characters exhibit moderate degrees of variation. The principal component analysis shows slight separation of populations from northwestern Croatia. Canonical discriminant analysis shows that the three a priori defined groups—three species, S. interrupta, S. juncifolia and S. ujhelyii, can be distinguished based on leaf blade anatomical characters. In addition to the characters that were singled out as statistically most significant for differentiation of the three species in discriminant function analysis, the most useful characters for their delimitation are the length of the trichomes on the adaxial side of the leaf, as well as qualitative characters such as the sclerenchyma on the abaxial side of the leaf (continuous or interrupted) and the type of indumentum of the adaxial side of the leaf (very hairy, hairs long vs. very weakly hairy, hairs short). The northwestern populations of S. juncifolia mostly have glabrous leaves or single hairs on the adaxial side of the leaf, while in S. interrupta and S. ujhelyii populations, individuals always have hairy leaves. The presence of continuous subepidermal sclerenchyma has proven to be a good differential character for separating S. ujhelyii from the S. juncifolia and S. interrupta.

scholarly journals Characterization of morphological and meristic traits and their variations between two different populations (wild and cultured) of <i>Cichlasoma festae</i>, a species native to tropical Ecuadorian rivers

2016 ◽  
Vol 59 (4) ◽  
pp. 435-444 ◽  
Author(s):  
Martín A. González ◽  
Jorge M. Rodriguez ◽  
Elena Angón ◽  
Andrés Martínez ◽  
Antón Garcia ◽  
...  
Keyword(s):  
Condition Factor ◽  
Univariate Analysis ◽  
Meristic Characters ◽  
Morphometric Measurements ◽  
Linear Discriminant ◽  
Length Standard ◽  
Cultured Fish ◽  
Different Populations ◽  
Two Populations

Abstract. This study was carried out to determine morphometric and meristic characteristics of two populations (wild and cultured) of Cichlasoma festae and to establish whether populations could be discriminated based on morphometric variability. Twenty-two morphometric and four meristic characters were used to test the hypothesis differentiation. Univariate analysis of variance (ANOVA) from 100 adult specimens showed significant differences (p <  0.05) for 21 standardized morphometric measurements out of 26 characters among the means of the wild and cultured Cichlasoma festae populations tested. Cross correlation amongst certain morphometric variables (i.e. body weight, total length, standard length, pre-ventral length, AC1, LC1 and P1) were medium-strong (r ≥  0.5), while the remaining were weakly correlated (r <  0.5). The length–weight relationship parameter b and condition factor (K) values were respectively 2.21 and 1.97 (indicating allometric growth) for cultured fish groups and 2.86 and 4.07 (p <  0.05) for wild fish groups. The condition factor values were significantly different from each other and showed that feeding of cultured fish should be improved. Both groups were accurately separated (>  80 % success rate) by linear discriminant functions that included only four morphometric measures.

A multivariate analysis of geographic variation in the Trapelus agilis complex (Sauria: Agamidae)

2005 ◽  
Vol 26 (2) ◽  
pp. 159-173 ◽  
Author(s):  
Nasrullah Rastegar-Pouyani
Keyword(s):  
Geographic Variation ◽  
Principal Components ◽  
Morphological Characters ◽  
Canonical Variate ◽  
Iranian Plateau ◽  
Operational Taxonomic Units ◽  
Central Asian ◽  
Southwestern Iran ◽  
Primary Groups ◽  
Former Ussr

AbstractThe "Trapelus agilis complex" encompasses three conventional taxa: T. a. agilis (Olivier), T. a. isolepis (Boulenger), and T. a. sanguinolentus (= T. sanguinolentus) (Pallas). In previous studies the author revised this complex, synonymized T. a. isolepis with T. a. agilis, and recognized four distinct subspecies within the complex: T. a. agilis from central Iranian Plateau, southern Afghanistan, and southwestern Pakistan; T. a. sanguinolentus from northeastern Iran, northern Afghanistan, and the Central Asian Republics of the former USSR as well as Daghestan; T. a. khuzistanensis from the lowland southwestern Iran; and T. a. pakistanensis from southeastern Pakistan as well as adjoining northwestern India. In order to re-evaluate this judgment and to resolve the patterns of geographic variation within and among the mentioned four taxa, cluster analysis, principal components analysis, and canonical variate analysis were employed using 18 most informative morphological characters recorded for 522 undamaged and fully-grown specimens belonging to 19 operational taxonomic units (OTUs) throughout the range. The principal components as well as canonical variate analyses identified four primary groups of individuals corresponding to the four taxa recognized by the previous studies.

scholarly journals Variation in morphological characters of Marsilea crenata living in floating aquatic, emergent aquatic, and terrestrial habitats

2021 ◽  
Vol 22 (7) ◽  
Author(s):  
WISANTI WISANTI ◽  
DURAN COREBIMA ALOYSIUS ◽  
Siti Zubaidah ◽  
SRI RAHAYU LESTARI
Keyword(s):  
Principal Component ◽  
Morphological Characters ◽  
Natural Habitats ◽  
Morphological Variations ◽  
Quantitative Characters ◽  
Morphological Adaptations ◽  
Terrestrial Habitats ◽  
Grouping Pattern ◽  
Qualitative Characters ◽  
Two Populations

Abstract. Wisanti, Aloysius DC, Zubaidah S, Lestari SR. 2021. Variation in morphological characters of Marsilea crenata living in floating aquatic, emergent aquatic, and terrestrial habitats. Biodiversitas 22: 2853-2859. Marsilea is a hydrophyte fern that has plasticity often influenced by enviroment. Several of the species with different habitats or geographies show morphological variations. Therefore, this study aims to analyze the variations in morphological characters of M. crenata growing in aquatic and terrestrial habitats. A total of 38 plant samples were collected from their natural habitats including floating aquatic, emergent aquatic, and terrestrial types. Morphological variations data included 4 qualitative characters and 9 quantitative characters. The quantitative characters were analyzed by one-way ANOVA to test for differences, while the combination of both characters was analyzed using Principal Component Analysis (PCA) to determine the distribution between groups. The data results showed a separate grouping pattern between aquatic and terrestrial populations. These two groups showed significant differences in 5 quantitative characters and 2 qualitative characters. However, emergent aquatic samples’ distribution pattern is closer to the terrestrial group. The characters’ similarity of these two populations was in ??the rhizomes air spaces area, the position between leaflets and absence of red streak on the abaxial lamina. Conclusively, the variations in M. crenata’s morphological characters indicate that this plant has experienced morphological adaptations to water availability in its environment.

scholarly journals Metamorphosis of whitemouth croaker Micropogonias furnieri (Pisces, Sciaenidae)

2020 ◽  
Vol 33 (2) ◽  
pp. 163-182
Author(s):  
Mara Braverman ◽  
Daniel Brown ◽  
E. Marcelo Acha
Keyword(s):  
Developmental Stages ◽  
Anterior Part ◽  
Feeding Activity ◽  
Principal Component ◽  
Morphological Characters ◽  
The Body ◽  
Juvenile Period ◽  
Meristic Characters ◽  
Early Stages ◽  
Micropogonias Furnieri

Fish metamorphosis is an important ontogenetic process with a key role on early stages survival and on successful recruitment to adult populations. The whitemouth croaker (Micropogonias furnieri) is an important commercial resource for the coastal fisheries of Argentina and Uruguay. Metamorphosis, using morphometric and morphological analyses during larval development was studied. Changes in morpho-meristic characters before and after metamorphosis were employed to determine the length interval of this transition by employing Principal Component Analysis. Individuals (n=430) from 4 to 41 mm standard length (SL) were collected in the Río de la Plata estuary (35.45º S, 56.35º W) in March 2006. Length ranges of individual´s developmental stages were associated with the presence of key morphological characters. During early life stages, M. furnieri changes from a big-headed, robust shape larva to a slender and more elongated body form. Most of the morphometric variables showed an inflexion point at 15.2 mm SL, with a 95% confidence interval of 14.0 – 16.4 mm. The anterior part of the body grows faster during early stages, probably related to an intense feeding activity strategy. The completion of pectoral fin rays and the onset of squamation determine the beginning of metamorphosis at 11-12 mm SL. At around 18 mm SL, squamation ends, first barbels develop and the sagittae otolith primordium is closed. The length-at-metamorphosis for M. furnieri was established between 9 to 18 mm SL, since all developmental characters studied highly overlapped at that interval. All those processes are indicative of the beginning of the juvenile period associated to the settlement and the start of a bottom-oriented life-style.

Distinguishing between Different Populations of Harp Seal (Phoca groenlandica) by Chemometry of the Fatty Acid Profiles in the Jaw Bone

1993 ◽  
Vol 50 (7) ◽  
pp. 1400-1404 ◽  
Author(s):  
Otto Grahl-Nielsen ◽  
Olav Mjaavatten ◽  
Einar Tvedt
Keyword(s):  
Fatty Acid ◽  
Barents Sea ◽  
Principal Component ◽  
Eye Lens ◽  
Fatty Acid Profiles ◽  
Phoca Groenlandica ◽  
The Barents Sea ◽  
Different Populations ◽  
The Difference ◽  
Two Populations

The relative amounts of various fatty acids of jawbone and eye lens were determined in harp seals (Phoca groenlandica) caught in the Greenland Sea and in the Barents Sea. The two tissues had distinctly different profiles. The fatty acid profile in the lens tissue changed with age. Principal component analysis of the data showed that the profiles in the jawbone were different in seals from the two populations, while the difference was much less prominent in the case of the eye lens. Using the jawbone profiles from the western and eastern seals as reference, it was shown that seven seals, caught in west coast seine nets during the large invasion of harp seals along the Norwegian coast in the winter of 1986–87, had come from the eastern population.

Land-Mark based morphometric and meristic variations in two congeneric hilsha population, Tenualosa ilisha and Tenualosa toli from Bangladesh water bodies

2020 ◽  
Vol 6 (2) ◽  
pp. 265-282
Author(s):  
Mithun Das ◽  
Md Mahiuddin Zahangir ◽  
Fatema Akhter ◽  
Md Main Uddin Mamun ◽  
Md Moudud Islam
Keyword(s):  
Function Analysis ◽  
Morphological Characteristics ◽  
Morphological Differentiation ◽  
Principal Component ◽  
Meristic Characters ◽  
Morphometric Measurements ◽  
Network Measurements ◽  
Morphometric Characters ◽  
Marine Population ◽  
Tenualosa Ilisha

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

Sign in / Sign up

Export Citation Format

Share Document