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 Morphometry, length-weight relationship and relative condition factor of red-toothed trigger fish, Odonus niger

2021 ◽  
Vol 42 (4) ◽  
pp. 1026-1032
Author(s):  
N.K. Suyani ◽  
◽  
R. Mridula ◽  
K.M. Rajesh ◽  
M.M. Meshram ◽  
...  
Keyword(s):  
Condition Factor ◽  
Coefficient Of Determination ◽  
Allometric Growth ◽  
Morphometric Measurements ◽  
Morphometric Characters ◽  
Weight Relationship ◽  
Relative Condition Factor ◽  
Wide Range ◽  
Size Groups ◽  
Combined Data

Aim: The study aimed to investigate the morphometric and meristic measurements, length-weight relationship and relative condition factor of Odonus niger landed along coastal Karnataka. Methodology: The morphometric and meristic measurements, length-weight relationship and relative condition factor (Kn) of O. niger was studied for a period of eight months from August 2019 to March 2020. The different morphometric characters were subjected to statistical analysis. The length-weight relationship was analyzed for both the sexes (female and male) and combined data. Monthly relative condition factor was analyzed for both the sexes and for different size group. Results: A comparison of different morphometric measurements exhibited good extent of correlation indicating good extent of interdependence of these characters. Four out of eight morphometric characters are environmentally controlled and suggested wide range of zoogeographical distribution of O. niger. The length-weight relationship is indicated as W = 0.046 L2.565, W = 0.044 L2.589 and W = 0.047 L2.561 with coefficient of determination (r2) of 0.910, 0.913 and 0.910 for male, female and combined sexes, respectively. The 'b' values of both the sexes (male and female) exhibited negative allometric growth (p<0.05) and appeared to be leaner. There was no significant (p<0.05) variation for relative condition factor (Kn) among the months and size groups. However, little higher values were observed during November and February. Interpretation: The study fills the knowledge gap and support for developing a suitable management system for this fish species.

Redescription of Robsonella fontaniana (Cephalopoda: Octopodidae)

2008 ◽  
Vol 88 (3) ◽  
pp. 617-624 ◽  
Author(s):  
C.M. Ibáñez ◽  
R.D. Sepúlveda ◽  
J. Guerrero ◽  
J. Chong
Keyword(s):  
Sexual Dimorphism ◽  
Morphological Characters ◽  
South Coast ◽  
Lateral Tooth ◽  
Zoological Museum ◽  
Adult Males ◽  
Morphometric Characters ◽  
Terminal Organ ◽  
The Family ◽  
Central South

The genus Robsonella Adam, 1938 belongs to the family Octopodidae and can only be identified by some characters present in males. In this work the species Robsonella fontaniana is redescribed from morphological and morphometric characters of 33 specimens (21 males and 12 females) collected on the central-south coast of Chile, during the years 2003 and 2004, and of 11 specimens (three males and eight females) obtained from the Zoological Museum of Hamburg. New diagnoses for the genus Robsonella and the species R. fontaniana are provided. Sexual dimorphism in R. fontaniana is evident by adult males having enlarged suckers and a shorter third right arm compared to the females. Some morphological characters such as ligula, radula and terminal organ diverticulum make it possible to distinguish this genus clearly from other genera. The ligula of the hectocotylized arm in Robsonella is characterized by a longitudinal groove, rounded tip, large calamus and seven copulatory lamellae. In addition, the first lateral tooth in the radula is crescent-shaped; this allows the identification of Robsonella regardless of sex.

Size At Sexual Maturity and Morphometric Variability in Three Populations of a Ustropotamobi Us Pallipes Pallipes (Lereboullet, 1858) According To a Restocking Strategy

Crustaceana ◽  
1997 ◽  
Vol 70 (4) ◽  
pp. 454-468 ◽  
Author(s):  
D. Romain ◽  
J.P. Mocquard ◽  
C. Souty-Grosset ◽  
F. Grandjean
Keyword(s):  
Sexual Maturity ◽  
Morphological Characters ◽  
Allometric Equation ◽  
Canonical Discriminant Analysis ◽  
The Other ◽  
Morphometric Characters ◽  
Relative Growth ◽  
Size At Sexual Maturity ◽  
Reference Parameter ◽  
Two Populations

AbstractSize at sexual maturity was determined by the allometric equation in three populations of Austropotamobius pallipes pallipes from the Poitou-Charentes region, France. Seven morphological characters were measured and POL (post orbital length) was used as a reference parameter. The puberal moult was identified by changes in the relative growth of CW (claw width) and CL (claw length) in both sexes. Males have shown variation of the relative growth of CW and CL at 19.15 mm of POL for the Gatineau (Gat) stream, 20.1 mm of POL for the Magnerolle (Mag) and 20.3 mm for the Fontaine Saint-Pierre (Fsp) populations, respectively. Sexual maturity of females occurred at 16.17 mm POL for the Fsp, 18.2 mm for the Mag and for the Gat. Geographic variation in A. pallipes was investigated using multivariate analysis of five morphometric characters on mature specimens. By canonical discriminant analysis, the Mag population was distinct from the other two populations. Results are discussed with regard to restocking strategy.

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 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 Sexual dimorphism in the squirrel monkey, Saimiri sciureus (Linnaeus, 1758) and Saimiri ustus (I. Geoffroy, 1844) (Primates, Cebidae)

2009 ◽  
Vol 69 (1) ◽  
pp. 171-174 ◽  
Author(s):  
B. Goldschmidt ◽  
A. Mota-Marinho ◽  
C. Araújo-Lopes ◽  
MA. Brück-Gonçalves ◽  
D. Matos-Fasano ◽  
...  
Keyword(s):  
Body Weight ◽  
Sexual Dimorphism ◽  
Squirrel Monkey ◽  
Coat Color ◽  
Morphological Characters ◽  
Saimiri Sciureus ◽  
External Ear ◽  
Adult Females ◽  
In The Wild ◽  
Capture Techniques

Causes and implications of sexual dimorphism have been studied in several different primates using a variety of morphological characters such as body weight, canine length, coat color and ornamentation. Here we describe a peculiar coat color characteristic in the squirrel monkey that is present only in adult females over five years old and which increases with age. Neither males nor young animals manifest this phenomenon, which is characterized by a spot of black hairs located anteriorly to the external ear (pinna). This characteristic could be used to discriminate adult females of Saimiri sciureus in the wild without the need of capture techniques.

Filling missing links in albuneid crab distributions (superfamily Hippoidea) in the Bay of Bengal, eastern Indian Ocean

Crustaceana ◽  
2018 ◽  
Vol 91 (12) ◽  
pp. 1495-1504 ◽  
Author(s):  
Rajan Kumar ◽  
Shikha Rahangdale ◽  
Subal Kumar Roul
Keyword(s):  
Indian Ocean ◽  
Bay Of Bengal ◽  
Morphological Characters ◽  
Eastern Indian Ocean ◽  
Species Discrimination ◽  
Gulf Of Mannar ◽  
Fishing Gear ◽  
Morphometric Characters ◽  
First Time

Abstract Albuneid crabs are specialized and active sand-burrowing organisms. Despite their substantial diversity, their ability to avoid fishing gear leads to “under collection” and a discontinuous record of distribution. The present study documents the first distributional record of Albunea occulta Boyko, 2002 from the Bay of Bengal, eastern Indian Ocean. Albunea thurstoni Henderson, 1893 is also recorded for the first time from the area, i.e., from the Gulf of Mannar, southwestern Bay of Bengal. This study further reports variation in morphological characters, especially in the carapace grooves (CG) from previous records and across specimens from different regions. Morphometric characters were found useful in species discrimination, which is explained as well.

scholarly journals Climatologia da Chuva em Maceió: Aspectos Climáticos e Ambientais

2021 ◽  
Vol 14 (4) ◽  
pp. 2253-2264
Author(s):  
José Francisco de Oliveira Júnior ◽  
Pedro Henrique de Almeida Souza ◽  
Edson de Oliveira Souza ◽  
Mário Henrique Guilherme dos santos Vanderlei ◽  
Washington Luiz Félix Correia Filho ◽  
...  
Keyword(s):  
Land Surface ◽  
Decadal Variability ◽  
Coefficient Of Determination ◽  
Rainfall Regime ◽  
Environmental Aspects ◽  
High Coefficient ◽  
Precipitation Product ◽  
Surface Areas ◽  
Period 2 ◽  
Statistical Indicators

The objectives of the study are: i) to evaluate the climatology of rain in Maceió based on observed data, with emphasis on climatic and environmental aspects and ii) to validate the precipitation product for the municipality. Data from 1979 to 2013 of the precipitation product CHELSA (Climatologies at High Resolution for the Earth's Land Surface Areas) were validated by rainfall data from the National Water Agency (NWA) from 1960 to 2016. Statistical indicators showed a high coefficient of determination and linear correlation between CHELSA and observed data (R2 = 0.80; r = 0.89) and the smallest errors (SEE = 6.58 mm and RMSE = 18.76 mm), therefore the CHELSA product can be applied in the region. The time series presented a period 1 (P1) - (1960 to 1989) with rainfall above the historical average and a period 2 (P2) - (1990 to 2016) with a significant reduction in rainfall. Observed data versus climatological normals showed a significant decrease in normal 1 (1961-1990) in the rainy season, while in relation to normal 2 (1981-2010) there was an increase in the months of February, March and April (between 10 to 20%) and October and December (between 5 to 15%). The spatial distribution of monthly rainfall via the CHELSA product showed the formation of a pluviometric gradient between the coast and the upper part of Maceió. The topography influences the rainfall regime in neighborhoods belonging to the administrative regions (AR) - (R4, R5 and R6) with the highest rainfall records. The ENOS phases are directly responsible for the variability of interannual rain, while the decadal variability corresponded to the PDO phase change and changes in land use and occupation in Maceió.

Taxonomy, natural history, and conservation of the Great-billed Seed-Finch Sporophila maximiliani (Cabanis, 1851) (Thraupidae, Sporophilinae)

Zootaxa ◽  
2018 ◽  
Vol 4442 (4) ◽  
pp. 551 ◽  
Author(s):  
FLÁVIO KULAIF UBAID ◽  
LUÍS FABIO SILVEIRA ◽  
CESAR A. B. MEDOLAGO ◽  
THIAGO V. V. COSTA ◽  
MERCIVAL ROBERTO FRANCISCO ◽  
...  
Keyword(s):  
Natural History ◽  
South America ◽  
Captive Breeding ◽  
Conservation Status ◽  
Bird Species ◽  
Principal Component ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
Morphometric Characters ◽  
History Of

Seed-finches are small-sized Neotropical granivorous birds characterized by extremely strong and thick beaks. Among these birds, the Great-billed Seed-Finch Sporophila maximiliani has been selectively and intensively trapped to the extent that has become one of the most endangered bird species in South America, yet its taxonomy remains complex and controversial. Two subspecies have been recognized: S. m. maximiliani (Cabanis, 1851), mainly from the Cerrado of central South America, and S. m. parkesi Olson (= Oryzoborus m. magnirostris), from northeastern South America. Originally, S. m. parkesi was diagnosed as being larger than the Large-billed Seed-Finch, S. c. crassirostris (Gmelin, 1789), but proper comparisons with S. m. maximiliani, which is larger than S. c. crassirostris, were never performed. Here we provide a review of the taxonomic and nomenclatural history of S. maximiliani, reevaluate the validity and taxonomic status of the subspecies based on morphological characters, and significantly revise its geographic distribution. Analyses based on plumage patterns and a Principal Component Analysis of morphometric characters indicated that S. m. parkesi is most appropriately treated as a synonym of the nominate taxon, which results in a monotypic S. maximiliani comprising two disjunct populations. Further, we conducted systematic searches for S. maximiliani in Brazil, in an attempt to obtain natural history information. After more than 6,000 hours of fieldwork in 45 areas of potential and historical occurrence, S. maximiliani was located only in two sites, in marshy environments called veredas, confirming the critical conservation status of this species, at least in Brazil. We discuss the conservation potential for, and the problems involved with, captive breeding of S. maximiliani for reintroduction into the wild. 

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