Morphometries of Three Sympatric Arctic Codfishes of the Genera Arctogadus and Gadus

1972 ◽  
Vol 29 (3) ◽  
pp. 243-249 ◽  
Author(s):  
Jean Boulva
Keyword(s):  
Sexual Dimorphism ◽  
Meristic Characters ◽  
Morphometric Characters ◽  
Otolith Shape ◽  
The Third ◽  
Two Populations

Three populations of codfishes inhabit the waters of Cambridge Bay: two belong to the genus Arctogadus, the third is Gadus ogac. In spite of phenotypic resemblances of some Arctogadus specimens to Gadus, the two genera are well separated as indicated by significant (P < 0.05) differences in otolith shape. Significant differences in 15 out of 27 morphometric characters and in two out of 10 meristic characters, and a different sexual dimorphism indicate that the separation of the Cambridge Bay Arctogadus stock in two populations is valid; these populations correspond respectively to the described species A. borisovi and A. glacialis.

scholarly journals Length-weight relationship and morphometrics of Osmerus eperlanus populations from two lakes of northeastern Poland

2021 ◽  
Vol 29 (3) ◽  
pp. 185-188
Author(s):  
Andrzej Kapusta ◽  
Piotr Traczuk ◽  
Piotr Chmieliński ◽  
Krzysztof Kozłowski
Keyword(s):  
Sexual Dimorphism ◽  
Morphological Characters ◽  
Coefficient Of Determination ◽  
Detailed Data ◽  
Morphometric Characters ◽  
High Coefficient ◽  
Weight Relationship ◽  
Northeastern Poland ◽  
Osmerus Eperlanus ◽  
Two Populations

Abstract This study provides the length-weight relationship (LWR) of European smelt (Osmerus eperlanus) occurring in two lakes in northeastern Poland. The morphometric characters of the two populations of this species in lakes Dargin and Dejguny were also compared. The LWRs were highly significant (P < 0.05) with a high coefficient of determination (r2 ≥ 0.923). The estimated b values ranged from 3.256 to 3.508. Sixteen of the 26 morphological characters measured differed between the two populations. No sexual dimorphism was observed. The research presents detailed data on the biometric characters of the species that contributes to the assessment of phenotypic plasticity and general morphological variation of the populations.

scholarly journals Assessment of morphological variation between stocks of bluefish, Pomatomus saltatrix (Actinopterygii, Perciformes, Pomatomidae), in the Aegean Sea, Black Sea, and Sea of Marmara

2021 ◽  
Vol 51 (1) ◽  
pp. 85-94
Author(s):  
Habib Bal ◽  
Telat Yanik ◽  
Dilek Türker
Keyword(s):  
Black Sea ◽  
Aegean Sea ◽  
Morphometric Character ◽  
Sea Of Marmara ◽  
Pomatomus Saltatrix ◽  
Meristic Characters ◽  
Morphometric Characters ◽  
Otolith Shape ◽  
Significant Difference ◽  
Shape Characters

The population structure of the bluefish, Pomatomus saltatrix (Linnaeus, 1766), in Turkish waters is scarcely described in the literature. To identify any distinct population units of bluefish, and reaffirm the findings of a previous study, four areas were selected: the Aegean Sea, western Black Sea, eastern Black Sea, and the Sea of Marmara. In this study, truss network morphometrics, meristics, and otolith shape analyses were successfully applied for different population identification of the bluefish. Multivariate analysis of variance (MANOVA) revealed no differences for truss network morphometrics, meristic, and otolith shape characters between males and females. Hence, both sexes were combined for the discriminant function (DFA) and the Principal Component Analysis (PCA). Using univariate ANOVA based on the stepwise method revealed a highly significant difference among different locations for each truss-morphometrics and otolith shape characters. Furthermore, six out of seven meristic characters also showed significant differences between different areas. Based on PCA, 25 out of 27 truss-morphometric characters had a loading value above 0.70, which was considered significant in this study. The results of DFA show clear patterns of truss-morphometric character variations, forming four distinct clusters that were well separated from each other, indicating the existence of four morphologically differentiated populations of the bluefish. The proportion of the correctly classified Aegean Sea, western Black Sea, and eastern Black Sea bluefish samples to their original groups were 100%, demonstrating clear separation of these stocks from each other. Whereas up to 5% of the total samples of the Sea of Marmara were incorrectly classified, assigning to the eastern Black Sea. These findings were supported by meristic and otolith shape characters that also indicated four morphologically differentiated populations of the bluefish. However, their overall proportion of correct classification was relatively lower than the truss-morphometric traits method. The findings suggest the requirement of strategic assessment and management of each bluefish stock separately to use them sustainably in the future.

Whiptail lizards in South America: a new Ameivula (Squamata, Teiidae) from Planalto dos Gerais, Eastern Brazilian Cerrado

2014 ◽  
Vol 35 (2) ◽  
pp. 227-242 ◽  
Author(s):  
Federico José Arias ◽  
Mauro Teixeira ◽  
Renato Recoder ◽  
Celso Morato de Carvalho ◽  
Hussam Zaher ◽  
...  
Keyword(s):  
New Species ◽  
Body Size ◽  
Discriminant Analysis ◽  
The Other ◽  
Brazilian Cerrado ◽  
Meristic Characters ◽  
Morphometric Characters ◽  
The Third ◽  
Quantitative Analyses ◽  
A New Species

We describe a new species of whiptail lizard genus Ameivula from Planalto dos Gerais, a sandstone plateau that extends along the Cerrado region in the states of Bahia, Tocantins, Piauí, and Minas Gerais, in Brazil. The new species is the third recognized species of the A. ocellifera group registered for the Cerrado. Quantitative analyses of morphometric characters showed that Caatinga species are distinguished from their Cerrado congeners on basis of body size and shape. A discriminant analysis upon meristic characters showed that the new species can be clearly distinguished from the other two Cerrado species A. mumbuca and A. jalapensis, also the morphology of the finger lamellae, and clutch size distinguish these species.

scholarly journals Genetics of Differences in Pheromonal Hydrocarbons Between Drosophila melanogaster and D. simulans

Genetics ◽  
1996 ◽  
Vol 143 (1) ◽  
pp. 353-364 ◽  
Author(s):  
Jerry A Coyne
Keyword(s):  
Drosophila Melanogaster ◽  
Sexual Dimorphism ◽  
Genetic Analysis ◽  
Species Difference ◽  
The Other ◽  
Chromosome 3 ◽  
Apparent Effect ◽  
The Third ◽  
Hydrocarbon Profile ◽  
The Right

Abstract Females of Drosophila melanogaster and its sibling species D. simulans have very different cuticular hydrocarbons, with the former bearing predominantly 7,11-heptacosadiene and the latter 7-tricosene. This difference contributes to reproductive isolation between the species. Genetic analysis shows that this difference maps to only the third chromosome, with the other three chromosomes having no apparent effect. The D. simulans alleles on the left arm of chromosome 3 are largely recessive, allowing us to search for the relevant regions using D. melanogaster deficiencies. At least four nonoverlapping regions of this arm have large effects on the hydrocarbon profile, implying that several genes on this arm are responsible for the species difference. Because the right arm of chromosome 3 also affects the hydrocarbon profile, a minimum of five genes appear to be involved. The large effect of the third chromosome on hydrocarbons has also been reported in the hybridization between D. simulans and its closer relative D. sechellia, implying either an evolutionaly convergence or the retention in D. sechllia of an ancestral sexual dimorphism.

scholarly journals Morphometric characters and their relationship in estuarine catfish

1970 ◽  
Vol 6 (2) ◽  
pp. 349-353 ◽  
Author(s):  
M Begum ◽  
Abdullah Al-Mamun ◽  
ML Islam ◽  
MJ Alam
Keyword(s):  
Sexual Dimorphism ◽  
Linear Relationship ◽  
Standard Length ◽  
Head Length ◽  
Pectoral Fin ◽  
Morphometric Characters ◽  
Total Length ◽  
Length Standard ◽  
Eye Diameter ◽  
Males And Females

The morphometric observations were made on total length, standard length, pre-caudal length, head length, eye diameter and depth of body at pectoral fin base of estuarine catfish M. gulio. Males and females showed homogeneity in characters. A linear relationship was found between total length and morphometric characters. Regression of length and weight did not deviate significantly from cube law indicating isometric growth. The fish exhibited sexual dimorphism. Keywords: Morphometric characters; Estuarine catfish; Mystus gulio DOI: 10.3329/jbau.v6i2.4833 J. Bangladesh Agril. Univ. 6(2): 349-353, 2008

scholarly journals A new wing skeleton of <i>Forfexopterus</i> (Pterosauria: Ctenochasmatidae) from the Early Cretaceous Jehol Biota reveals a developmental variation

Fossil Record ◽  
2020 ◽  
Vol 23 (2) ◽  
pp. 191-196
Author(s):  
Chang-Fu Zhou ◽  
Jiahao Wang ◽  
Ziheng Zhu
Keyword(s):  
Sexual Dimorphism ◽  
Early Cretaceous ◽  
Skeletal Maturity ◽  
Filter Feeding ◽  
Jehol Biota ◽  
Western Liaoning ◽  
Developmental Variation ◽  
The Third

Abstract. In the Jehol Biota, the filter-feeding ctenochasmatid pterosaurs flourished with a high biodiversity. Here, we report a new wing skeleton of the ctenochasmatid Forfexopterus from the Early Cretaceous Jiufotang Formation in Jianchang, western Liaoning, China. The specimen exhibits the sole autapomorphy, the first wing phalanx shorter than the second and longer than the third. Interestingly, it exhibits a skeletal maturity with co-ossified elements, but it is only about 75 % the size of the immature holotype. This discrepancy reveals developmental variation of Forfexopterus, but its relationship with sexual dimorphism needs to be certain by more available material.

scholarly journals Truss network based morphometric and meristic variations among south-western populations of Macrognathus aculeatus in Bangladesh

2021 ◽  
Vol 42 (3(SI)) ◽  
pp. 887-894
Author(s):  
M. Sarower-E-Mahfuj ◽  
◽  
S.K. Das ◽  
K.N. Azad ◽  
A.K. Paul ◽  
...  
Keyword(s):  
Analysis Of Variance ◽  
Discriminant Function ◽  
Network System ◽  
Meristic Characters ◽  
Morphometric Characters ◽  
Baseline Information ◽  
Macrognathus Aculeatus ◽  
Post Hoc ◽  
Separation Results ◽  
Discriminant Function Analyses

Aim: Landmark-based truss network system was applied to examine the morphometric and meristic differences among four different populaces of Macrognathus aculeatus namely; Dhakuriabeel, Jashore (DBJ); Arial Kha River, Madaripur (AKRM); Nabaganga River, Jhenaidah (NRJ); Kopotakkha River, Jashore (KRJ) in Bangladesh. Methodology: Completely 80 samples of M. aculeatus were collected (20 individuals from each population) for this study. Six meristic characters, 6 morphometric characters and 15 truss-based morphometric characters were measured for one-way analysis of variance (ANOVA) and Tukey-HSD post hoc test. Discriminant function analyses were also performed by using morphometric and truss-based morphometric characters to detect potential characters responsible for population separation. Results: Completely 80 samples of M. aculeatus were collected (20 individuals from each population) for this study. Six meristic characters, 6 morphometric characters and 15 truss-based morphometric characters were measured for one-way analysis of variance (ANOVA) and Tukey-HSD post hoc test. Discriminant function analyses were also performed by using morphometric and truss-based morphometric characters to detect potential characters responsible for population separation. Interpretation: The baseline information derived from the present study would be useful for appropriate conservation of M. aculeatus populations as well as for the researchers for further investigation.

scholarly journals Sexual dimorphism of sharks from the amazonian equatorial coast

2015 ◽  
Vol 20 (3) ◽  
pp. 297 ◽  
Author(s):  
Jorge Luiz Silva Nunes ◽  
Ana Paula Barbosa Martins ◽  
Ednaldo Da Silva Filho ◽  
Leonardo Manir Feitosa ◽  
Luiz Phelipe Nunes e Silva ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Discriminant Analysis ◽  
Mating Behavior ◽  
T Test ◽  
Internal Fertilization ◽  
Morphometric Characters ◽  
Morphological Differences ◽  
Student’S T ◽  
Different Levels ◽  
Student’S T Test

Sexual dimorphism is a widespread feature in several groups of vertebrates. Chondrichthyans differ sexually due to the presence of the clasper, a structure for internal fertilization, and other sexual differences in secondary characteristics. Nevertheless, studies assessing these variations are fairly rare. The main goal of this study is to identify differences in sexual dimorphism in three species of sharks from the Carcharhinidae family (<em>Rhizoprionodon porosus</em>, <em>Carcharhinus porosus</em> and <em>Isogomphodon oxyrhynchus</em>) using morphometric tools. A total of 213 specimens were captured in the Amazonian Equatorial Coast and analyzed using 65 morphometric characters. Discriminant analysis and The Student's t-test were used to demonstrate the morphological differences among sexes. Sexual dimorphism was reported at different levels for the three species. This study suggests that the most likely explanation for the presence of these variations is related to their reproductive characteristics and mating behavior.

scholarly journals Intra-Specific Venom Variation in the Australian Coastal Taipan Oxyuranus scutellatus

Toxins ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 485 ◽  
Author(s):  
Theo Tasoulis ◽  
Anjana Silva ◽  
Punnam Chander Veerati ◽  
Mark Baker ◽  
Wayne C. Hodgson ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Snake Venom ◽  
Geographical Variation ◽  
East Coast ◽  
Population Variation ◽  
The Other ◽  
North East ◽  
The North ◽  
Specific Variation ◽  
Two Populations

Intra-specific venom variation has the potential to provide important insights into the evolution of snake venom, but remains a relatively neglected aspect of snake venom studies. We investigated the venom from 13 individual coastal taipans Oxyuranus scutellatus from four localities on the north-east coast of Australia, spanning a distance of 2000 km. The intra-specific variation in taipan venom was considerably less than the inter-specific variation between it and the other Australian elapids to which it was compared. The electrophoretic venom profile of O. scutellatus was visually different to six other genera of Australian elapids, but not to its congener inland taipan O. microlepidotus. There was minimal geographical variation in taipan venom, as the intra-population variation exceeded the inter-population variation for enzymatic activity, procoagulant activity, and the abundance of neurotoxins. The pre-synaptic neurotoxin (taipoxin) was more abundant than the post-synaptic neurotoxins (3FTx), with a median of 11.0% (interquartile range (IQR): 9.7% to 18.3%; range: 6.7% to 23.6%) vs. a median of 3.4% (IQR: 0.4% to 6.7%; range: 0% to 8.1%). Three taipan individuals almost completely lacked post-synaptic neurotoxins, which was not associated with geography and occurred within two populations. We found no evidence of sexual dimorphism in taipan venom. Our study provides a basis for evaluating the significance of intra-specific venom variation within a phylogenetic context by comparing it to the inter-specific and inter-generic variation. The considerable intra-population variation we observed supports the use of several unpooled individuals from each population when making inter-specific comparisons.

Reproduction and Sexual Dimorphism in Two Populations of Sceloporus grammicus (Sauria: Phrynosomatidae) from Hidalgo, Mexico

Herpetologica ◽  
2010 ◽  
Vol 66 (1) ◽  
pp. 12-22 ◽  
Author(s):  
Uriel Hernández-Salinas ◽  
Aurelio Ramírez-Bautista ◽  
Adrian Leyte-Manrique ◽  
Geoffrey R. Smith
Keyword(s):  
Sexual Dimorphism ◽  
Sceloporus Grammicus ◽  
Two Populations
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