Morphometric analysis of the shell of the intertidal gastropod Echinolittorina lineolata (d'Orbigny, 1840) at different latitudes along the Brazilian coast

2020 ◽  
Vol 100 (5) ◽  
pp. 725-731
Author(s):  
Alisson Sousa Matos ◽  
Helena Matthews-Cascon ◽  
Oscar R. Chaparro
Keyword(s):  
Morphometric Analysis ◽  
Brazilian Coast ◽  
Intertidal Gastropod ◽  
Males And Females

AbstractMorphometric analysis is one of the tools widely used to quantify, analyse and describe the variations in the biological forms of animals. In this study, we examined the linear morphometric variations of the shell of the small intertidal gastropod Echinolittorina lineolata and compared the patterns to identify variations among populations and between sexes. The individuals were collected from latitudes 3°S, 14°S, 21°S and 23°S along the Brazilian coast. Traditional morphometric analysis was performed, and the morphometric variables of the shells, namely, the length and width of the shell and the length and width of the shell opening were obtained. The observed size pattern was influenced by latitude, as well as by local spatial responses to factors such as the substrate changing the morphometric variables of the snail. Of the morphometric variables, the length and the width of the shell were the most representative variables that influenced the gastropods in the different latitudes. These variables were also different in males and females, with females having larger shell lengths and widths across all latitudes.

scholarly journals Cuttlebone morphometrics and sex identification of Sepia bertheloti (d’Orbigny, 1835) from the central-east Atlantic

2019 ◽  
Vol 73 (1) ◽  
Author(s):  
Airam Guerra-Marrero ◽  
David Jiménez-Alvarado ◽  
Vicente Hernández-García ◽  
Leticia Curbelo-Muñoz ◽  
José Juan Castro-Hernández
Keyword(s):  
Morphometric Analysis ◽  
Growth Pattern ◽  
Gonadal Development ◽  
Sex Identification ◽  
East Atlantic ◽  
Subsequent Increase ◽  
Northwest Africa ◽  
Males And Females

Abstract Analysis of 322 cuttlebones of Sepia bertheloti caught in the waters of the Northwest Africa showed significant differences in growth between males and females. Morphometric analysis revealed a relatively different cuttlebone growth pattern between sexes, with males presenting faster growth in length to reach larger sizes and females displaying greater growth in width. This difference in cuttlebone growth is related to female gonadal development and the subsequent increase of the paleal cavity, providing more support and space to accommodate a higher number of oocytes.

scholarly journals Multi-aspect testing and ranking inference to quantify dimorphism in the cytoarchitecture of cerebellum of male, female and intersex individuals: a model applied to bovine brains

2020 ◽  
Vol 225 (9) ◽  
pp. 2669-2688
Author(s):  
L. Corain ◽  
E. Grisan ◽  
J.-M. Graïc ◽  
R. Carvajal-Schiaffino ◽  
B. Cozzi ◽  
...  
Keyword(s):  
Morphometric Analysis ◽  
Data Analytics ◽  
Granule Cells ◽  
Neuronal Cell ◽  
Purkinje Neurons ◽  
Shape Descriptors ◽  
Morphological Pattern ◽  
Depth Analysis ◽  
Viii And Ix ◽  
Males And Females

AbstractThe dimorphism among male, female and freemartin intersex bovines, focusing on the vermal lobules VIII and IX, was analyzed using a novel data analytics approach to quantify morphometric differences in the cytoarchitecture of digitalized sections of the cerebellum. This methodology consists of multivariate and multi-aspect testing for cytoarchitecture-ranking, based on neuronal cell complexity among populations defined by factors, such as sex, age or pathology. In this context, we computed a set of shape descriptors of the neural cell morphology, categorized them into three domains named size, regularity and density, respectively. The output and results of our methodology are multivariate in nature, allowing an in-depth analysis of the cytoarchitectonic organization and morphology of cells. Interestingly, the Purkinje neurons and the underlying granule cells revealed the same morphological pattern: female possessed larger, denser and more irregular neurons than males. In the Freemartin, Purkinje neurons showed an intermediate setting between males and females, while the granule cells were the largest, most regular and dense. This methodology could be a powerful instrument to carry out morphometric analysis providing robust bases for objective tissue screening, especially in the field of neurodegenerative pathologies.

scholarly journals On the identities of Callianassa bouvieri Nobili, 1904, C. maldivensis Borradaile, 1904, and C. gravieri Nobili, 1905 (Crustacea: Decapoda: Callianassidae): a morphometric approach

Zootaxa ◽  
2012 ◽  
Vol 3149 (1) ◽  
pp. 39 ◽  
Author(s):  
PETER C. DWORSCHAK
Keyword(s):  
Morphometric Analysis ◽  
Junior Synonym ◽  
Type Specimens ◽  
Separate Species ◽  
Males And Females

Recent samplings of callianassid shrimp from various habitats, together with the study of type specimens, show that Cal-lianassa gravieri Nobili, 1905 is a junior synonym of Callianassa bouvieri Nobili, 1904. Callianassa maldivensis Borra-daile, 1904, which had been synonymised with the latter, is a separate species. Morphometric analysis of more than 250specimens of these shrimps, which are assigned here to the genus Paratrypaea Komai & Tachikawa, 2008, show that P.bouvieri males and females have unequal chelipeds, whereas P. maldivensis has males with unequal chelipeds and femaleswith equal chelipeds. In addition, both species differ by the presence/absence and size of a median spine on the posteriortelson border. Male P. bouvieri and P. maldivensis are superficially similar but can be differentiated based on numerouscharacters of the major chelipeds, which are illustrated here in detail. The two species occur in different habitats, P. bou-vieri in the intertidal, often near mangroves, P. maldivensis usually sublittoraly near patchy corals. The importance of size and sex when comparing callianassid species is discussed.

scholarly journals Reproductive biology of the Brazilian sharpnose shark (Rhizoprionodon lalandii) from southeastern Brazil

2007 ◽  
Vol 64 (9) ◽  
pp. 1829-1835 ◽  
Author(s):  
Fabio S. Motta ◽  
Rafael C. Namora ◽  
Otto B. F. Gadig ◽  
F. M. S. Braga
Keyword(s):  
Reproductive Biology ◽  
Positive Relationship ◽  
Ovarian Follicles ◽  
Southeastern Brazil ◽  
Brazilian Coast ◽  
Marine Science ◽  
Size At Maturity ◽  
Total Length ◽  
Males And Females ◽  
Using Data

Abstract Motta, F. S., Namora, R. C., Gadig, O. B. F., and Braga, F. M. S. 2007. Reproductive biology of the Brazilian sharpnose shark (Rhizoprionodon lalandii) from southeastern Brazil. – ICES Journal of Marine Science, 64: 1829–1835. The reproductive biology of the Brazilian sharpnose shark, Rhizoprionodon lalandii, off southeastern Brazil was investigated using data from gillnet landings. The size-at-maturity for males and females was estimated to be 59 and 62 cm total length (LT), respectively. Ovarian fecundity ranged from 3 to 7 follicles (mean = 4.54), and uterine fecundity from 1 to 5 embryos (mean = 3.3). There was a slight positive relationship between female LT and the number of ovarian follicles, but uterine fecundity was not related to female LT. Embryonic growth is fast following fertilization during summer and autumn. Gestation requires 11–12 months, and peak parturition is between August and September. A comparison of size-at-maturity between animals from northeastern and southeastern Brazil suggests the existence of at least two stocks of R. lalandii along the Brazilian coast.

scholarly journals Morphometric analysis of freshwater crab, Potamon koolooense (Decapoda: Brachyura: Potamidae) from hillstream Khoh, Uttarakhand

2013 ◽  
Vol 14 (1&2) ◽  
pp. 55-59
Author(s):  
Shurveer Singh ◽  
Ashish K. Chowdhary ◽  
Anita Rawat Rana ◽  
S.N. Bahuguna
Keyword(s):  
Morphometric Analysis ◽  
Growth Pattern ◽  
Carapace Length ◽  
Regression Equations ◽  
Freshwater Crab ◽  
Allometric Growth ◽  
Monthly Basis ◽  
Anova Test ◽  
Weight Relationship ◽  
Males And Females

The present study was carried out on freshwater crab in hillstream Khoh of district Pauri Garhwal in Uttarakhand state. Samples of crab were collected from the population inhabits the hillstream Khoh on monthly basis during May 2011 to April 2012. The regression equations for the length-weight relationship in crabs were obtained as Y=2.045X+0.266 and Y=1.522X+0.392 for males and females respectively. The ANOVA test revealed significant differences in carapace length-weight relationship at p<0.05 for both the sexes. Allometric growth pattern was observed in the study for both sexes of P. koolooense. A weak relationship was observed between length and weight of the specimen.

Three new species of Colomastix Grube, 1861 (Amphipoda: Colomastigidea) from Todos-os-Santos Bay, northeastern Brazilian coast, with identification keys to Atlantic Ocean species

Zootaxa ◽  
2019 ◽  
Vol 4629 (4) ◽  
pp. 519-554 ◽  
Author(s):  
LIZ SILVANY ◽  
ANDRÉ R. SENNA
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
Brazilian Coast ◽  
Identification Keys ◽  
Males And Females ◽  
Three New Species

Colomastigids are small, commensal marine amphipods distributed worldwide. Here we present descriptions of three new species of Colomastix Grube, 1861 from Todos-os-Santos Bay (Bahia state), and separately identification keys to males and females of all known Colomastix species from the Atlantic Ocean. Males of Colomastix iemanja sp. nov. can be distinguished from all others in the genus especially by the bifurcate apex of inner ramus of uropod 1, with highly asymmetric branches surrounded by a membranous-like structure. Males of Colomastix tubulosa sp. nov. can be distinguished from all others in the genus especially by the tube-like morphology of the apex of inner ramus of uropod 1, the morphology of the distalmost palmar process of gnathopod 2 and by the expanded inner ramus of uropod 2. Females of Colomastix iemanja sp. nov. and Colomastix tubulosa sp. nov. are the only species in the Atlantic with a pleated apex on dactylus of gnathopod 2, besides Colomastix trispinosa Silvany, Alves & Senna, 2019. Colomastix marielle sp. nov. can be distinguished from all other species in the genus by the elongate carpus of pereopod 5 of females and by the rudder-like morphology of the apex of inner ramus of uropod 1 of males. These three new species increase the number of Colomastix in the Atlantic from 18 to 21, and are amongst the first records of the suborder Colomastigidea Lowry & Myers, 2017 from Brazilian waters. 

Sexual Selection in Dung Beetles .1. A Multivariate Study of the Morphological Variation in 2 Species of Onthophagus (Scarabaeidae, Onthophagini)

1987 ◽  
Vol 35 (2) ◽  
pp. 123 ◽  
Author(s):  
D Cook
Keyword(s):  
Sexual Selection ◽  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Body Shape ◽  
Dung Beetles ◽  
Structural Polymorphism ◽  
Multivariate Study ◽  
History Of ◽  
Males And Females ◽  
Horned Beetles

Sexual dimorphism in horned beetles reflects a history of different selection pressures operating on males and females. A multivariate morphometric analysis was carried out on two scarabaeine dung beetles, Onthophagus binodis Thunberg and O. ferox Harold. There is clear structural polymorphism within O. binodis; horned males, females and hornless males were separated on the basis of body shape. Sexual dimorphism within O. ferox was established; sexes were separated according to the size of pronotal and cephalic horns. The effect of differential selection is discussed within the context of sexual selection.

scholarly journals A note on strandings of Bryde's whales (Balaenoptera edeni) in the southwestern Atlantic

2020 ◽  
Vol 21 (1) ◽  
pp. 9-15
Author(s):  
Eduardo Cabral Casado Lima
Keyword(s):  
Sexual Maturity ◽  
Brazilian Coast ◽  
Southwestern Atlantic ◽  
Simple Linear Regression ◽  
Rio Grande Do Sul ◽  
Significant Difference ◽  
Males And Females ◽  
Anthropogenic Threats ◽  
Sexually Mature

The aim of the present study is to trace a diagnosis of Bryde´s whale (Balaenoptera edeni) strandings in jurisdictional Brazilian waters through the compilation of published records and those conveyed in communication channels. During 1972 and 2015, 74 strandings were documented between the states of Rio Grande do Sul and Rio de Janeiro, Bahia and Maranhão. The results point out statistically significant differences between the frequencies of strandings in relation to Brazilian regions (χ² = 103.17), with the highest abundance found for the Southeast region (71.62%). Statistically significant differences were also observed between stranding frequency and sexual maturity (χ² = 12.31), with a higher abundance for sexually mature females(54.25%). No statistically significant difference between the stranding frequency in relation to seasonality (χ² = 2.34) was observed. Regarding sex, no statistically significant difference between stranding frequency for males and females was found (χ²=3.12). A trend of increasing B.edeni strandings was observed from the 1980s onwards, by the use of a simple linear regression. This may be due to population growth of the species, increased monitoring throughout the Brazilian coast, and/or increased anthropogenic threats. Thus,stranding monitoring is important for the adoption of conservation measures for this species, as well as for the determination of regional stocks through genetic analyses.  

Population biology of Callinectes danae and Callinectes sapidus (Crustacea: Brachyura: Portunidae) in the south-western Atlantic

2009 ◽  
Vol 89 (7) ◽  
pp. 1341-1351 ◽  
Author(s):  
Mário José Pereira ◽  
Joaquim Olinto Branco ◽  
Martin Lindsey Christoffersen ◽  
Felipe Freitas ◽  
Hélio Augusto Alves Fracasso ◽  
...  
Keyword(s):  
Population Biology ◽  
Callinectes Sapidus ◽  
Relative Equilibrium ◽  
Carapace Width ◽  
Fishing Effort ◽  
Brazilian Coast ◽  
Egg Mass ◽  
Western Atlantic ◽  
Males And Females ◽  
Callinectes Danae

The capture of crabs of the genus Callinectes is one of the oldest extractive activities practised by waterside communities, due to the abundance of brachyurans along the Brazilian coast. The present paper aimed to provide basic information on the population biology of C. sapidus and C. danae during the period of December 2003 to November 2004, in Babitonga Bay, Joinville, Santa Catarina. The size of the first maturation of C. danae was estimated as 7.1 cm in total carapace width for females, and as 8.6 cm for males. Fecundity of the 20 females of C. danae with carapace width from 7.0 to 11.0 cm varied from 618,667 to 811,267 eggs. Fecundity of C. sapidus was higher, with a median of 978,000 eggs per female, but carapace widths in this species were also larger, with the highest frequency of females attaining 19.01 cm on average. In both species, a tendency was observed for the egg mass to increase with size of females. The capture per unit of effort presented the lowest values in summer, while the largest values occurred from March, August and November. A total of 80 males and 117 females of C. sapidus were captured in the four collecting areas, with the largest abundances in Area III (45.18%), followed by Areas II, IV and I. The size of the first maturation of C. sapidus was estimated as 10.2 cm for females and as 9.0 cm for males. Fishing effort was in relative equilibrium for adult stock (males = 58.75% and females = 52.99%) and juveniles (males = 41.25% and females = 47.01%). The largest monthly rates of biomass of C. sapidus occurred from April to November, with a peak of capture in August, without significant differences in the participation of males and females.

scholarly journals An Electron Microscopical Examination of the Ageing Process of the Wing Muscles of the House Fly (Musca Domestica)

1977 ◽  
Vol 46 (2) ◽  
pp. 185-198 ◽  
Author(s):  
P.C. Diegenbach ◽  
E. Meijssen-de Ridder
Keyword(s):  
Musca Domestica ◽  
Morphometric Analysis ◽  
Total Activity ◽  
House Fly ◽  
Microscopical Examination ◽  
Dehydrogenase Reaction ◽  
Cell Components ◽  
Males And Females ◽  
Electron Microscopical ◽  
Clear Increase

Morphometric analysis was carried out on wing muscles of the House Fly (Musca domestica), ranging from the pupation period to death. In the first week a clear increase was found in the percentage of food reserve consumed by the cell components. Both fibrils and sarcosomes increase in circumference during the first week. The sarcosomes then fuse. After the first week few changes occur. The sarcosomal volume increases in male flies. No disintegration or degeneration of the muscle cells appears with old age. Even the fact that the wing of the male flies exhibits abrasion earlier than that of females cannot be correlated with changes in the wing muscles. The ratio of fibrils to sarcosomes is greater than two to one. This ratio differs in males and females. A gradual decrease in the number of cristae per sarcosome was observed during ageing. This can influence the total activity of the sarcosome. The succinate dehydrogenase reaction is not dependent on age. The presence of two types of sarcosomes is unlikely. Sarcosomes with more cristae are of a darker colour than those with few cristae.

Sign in / Sign up

Export Citation Format

Share Document