Search Results for : Shape analysis
Skull shape variation in the Armored Sailfin catfish, Pterygoplichthys disjunctivus (Siluriformes: Loricariidae), described using geometric morphometrics
The two-dimensional shapes of the skulls of male and female Armored Sailfin Catfish, Pterygoplichthys disjunctivus, were reconstructed in this study using Thin-Plate Spline (TPS) grids. The rationale for doing this is to draw out hypotheses regarding the life history and population dynamics of the Armored Sailfin Fish, which is becoming a nuisance in some freshwater […]
Geometric morphometric and heavy metals analysis of flathead grey mullet (Mugil cephalus), from Agusan River, Butuan city, Philippines
Geometric Morphometric used as a tool in quantifying phenotypic variations among species of the same population. The analysis of heavy metals in the fishes created to determine the extent of harmful elements found since it serves as a human food source. This study aims to determine the fluctuating asymmetry (FA) in the body shapes of […]
Outline-based Analysis of Sexual Dimorphism in the Shell of the Freshwater Mussel (Margaritifera margaritifera L.)
This study was conducted to determine the patterns of sexual dimorphism in the vulnerable species of freshwater mussel Margaritifera margaritifera L. The method of Elliptic Fourier Analysis (EFA) was employed to extract shape information from a total of one hundred (100) points collected from digitized images of the shells. The EFA coordinates where then subjected […]
Morphological characterization and diversity analysis of some selected aromatic rice genotypes in Bangladesh
The improvement of aromatic rice genotypes requires proper characterization of its existing germplasm. For this purpose, twenty four (nineteen aromatic and five non-aromatic fine) rice genotypes were evaluated for twenty qualitative and sixteen quantitative traits at morphological level to identify the suitable genotypes for future hybridization program at Bangabandhu Sheikh Mujibur Rahman Agricultural University. All […]
Mandibular shape variation among different size classes of the ant Camponotus sp.(Hymenoptera: Formicidae)
This study was conducted to determine shape differences in the mandibles of different size classes of the ant Camponotus sp.. To do this, landmarks taken from digital images of a total of sixty minor (30) and major worker (30) ants were subjected to the outline-based Geometric Morphometric Analsis of Elliptic Fourier Analysis (EFA). Results showed […]
Mandibular shape variation among size classes in the worker ants of Pheidologeton diversus
The geometric morphometric approach of landmark analysis was utilized in this study to compare the shapes of the mandibles of three size classes of the ant Pheidologeton diversus. To do this, the X and Y coordinates of a total of fifty points were digitized and subjected to relative warp analysis. Results showed that the mandibular […]
Using Thin-plate Spline Grids in Modeling Sex Differences in the Shapes of the Apical Disc in the Sea Urchin Tripneustes gratilla
Variations in the shapes of the apical discs between sexes in the sea urchin Tripneustes gratilla were modeled through the use of Thin-plate spline (TPS) deformation grids.The analysis was done in two levels. First, the consensus or average morphologies of each sex were established and compared. Second, patterns of shape variation were analyzed through a […]
Morphological variations of green mussel (Perna viridis) in bula, general santos city using geometric morphometric analysis
The Philippines, being a tropical country in the Pacific, has long been culturing mussels for business and food consumption. However, they cannot determine at a glance what gender is which. This study is conducted to determine the difference of the male P. viridis and the female P. viridis through landmark based Geometric-Morphometric method. The population […]
Population analysis via fluctuating asymmetry in the wings of Culex quinquefasciatus say from selected breeding sites in Iligan City, Philippines
Fluctuating asymmetry (FA) refers to the unequal bilateral sides of an organism. It occurs when an individual is unable to undergo identical development on both sides of a bilaterally symmetrical trait. It measures the sensitivity of development to a broad array of environmental and genetic stresses. In this study, FA was used to measure developmental […]
Gradient analysis of urban landscape pattern (Case Study: Isfahan, Iran)
Urban landscape is a heterogeneous mosaic of physical and biological patches. Quantifying the landscape pattern is required to assess and monitor economical, social and ecological functions of a city. This study has been developed by the expansion of the fields such as landscape ecology. In this study a combination of gradient analysis and landscape metrics […]