scholarly journals A multivariate study of variation in two species of rock crab of the genus Leptograpsus

1974 ◽  
Vol 22 (3) ◽  
pp. 417 ◽  
Author(s):  
NA Campbell ◽  
RJ Mahon
Keyword(s):  
Carapace Length ◽  
Carapace Width ◽  
The Body ◽  
Canonical Variate ◽  
Multivariate Approach ◽  
Maximum Width ◽  
Multivariate Study ◽  
Rock Crab ◽  
Males And Females ◽  
Colour Form

A multivariate approach has been used to study morphological variation in the blue and orange-form species of rock crab of the genus Leptograpsus. Objective criteria for the identification of the two species are established, based on the following characters: width of the frontal region of the carapace; width of the posterior region of the carapace (rear width); length of the carapace along the midline; maximum width of the carapace; and the depth of the body. The first canonical variate, which differentiates between the two species, represents a contrast between the carapace width relative to the width of the front lip and the depth of the body; the blue-form species has a greater relative carapace width than has the orange form. The second canonical variate, which presents a contrast between the rear width and the carapace length, identifies males and females within each species; males have a greater relative carapace length than have females. All individuals, including 20 not used in the study, were correctly identified for colour form. The clear separation of the blue and orange forms achieved by canonical analysis supports the previously determined specific status of the two forms.

scholarly journals Investigations of Variability of Morphometric Characteristics in Stone Crayfish in Order to Preserve Autochthonous Genome

2020 ◽  
Vol 18 (1-2) ◽  
Author(s):  
Rajko Roljić ◽  
Vera Nikolić ◽  
Nebojša Savić
Keyword(s):  
Sexual Dimorphism ◽  
Carapace Length ◽  
Carapace Width ◽  
Morphological Variability ◽  
The Body ◽  
Morphometric Characteristics ◽  
Baited Traps ◽  
Males And Females ◽  
Austropotamobius Torrentium ◽  
Stone Crayfish

This paper presents the information about morphological variability and sexual dimorphism of the stone crayfish (Austropotamobius torrentium) in the area of Korana River in Mrkonjic Grad. The crayfish were caught by hand made baited traps from October 2018 to May 2019. A total of 46 crayfish were caught, of which 33 males and 13 females. The dimensions of eight morphometric characteristics: body weight (W), body length (TBL), rostrum length (ROL), rostrum width (ROW), claw length (CLL), carapace length (CPL), carapace width (CPW) and abdomen length (ABL), were analyzed, both in males and females. Also, the body condition was determined for all individuales. The measurements results of morphometric characteristics partially matched into the alredy known range of variations. These data presens first ones for the observed area. By using Mann-Whitey U-test, it was noted that there are significant differences between the sexes for W, TBL, CLL, CPL, CPW and ABL. These resuls could be explained by sexual dimorphism of the stone crayfish.

Morphological Divergence in the Genus Eptesicus (Microchiroptera: Vespertilionidae) in Western Australia: a Multivariate Approach.

1980 ◽  
Vol 28 (3) ◽  
pp. 457 ◽  
Author(s):  
NA Campbell ◽  
DJ Kitchener
Keyword(s):  
Western Australia ◽  
Canonical Variate ◽  
Morphological Divergence ◽  
Multivariate Approach ◽  
The South ◽  
Male And Female ◽  
North West ◽  
South West ◽  
Variate Analysis ◽  
Males And Females

Analyses of morphological divergence in male and female Eptesicus in Western Australia are detailed. Phenetic differences between individuals at each locality, or nearby groups of localities, are examined for males and females separately, by canonical variate analysis. Populations can be roughly grouped into those of the South-west, North-west-Desert, Pilbara, Kimberley and the Peninsulas. Trends are evident from the analysis of the regional data for external morphological measurements. The South-west populations are referable to Eptesicus regulus Thomas, 1906. The moderately large Northwest-Desert populations are considered part of a general cline of Eptesicus pumilus extending north through the intermediate-sized Pilbara populations to the small Kimberley populations. The Peninsula populations have their greatest phenetic affinities with Eptesicus douglasi. In all populations examined, female Eptesicus tend to be larger than males.

scholarly journals Comparison of body size, relative growth and size at onset sexual maturity of Uca uruguayensis (Crustacea: Decapoda: Ocypodidae) from different latitudes in the south-western Atlantic

2012 ◽  
Vol 93 (3) ◽  
pp. 781-788 ◽  
Author(s):  
Gustavo Luis Hirose ◽  
Vivian Fransozo ◽  
Carolina Tropea ◽  
Laura S. López-Greco ◽  
Maria Lucia Negreiros-Fransozo
Keyword(s):  
Body Size ◽  
Sexual Maturity ◽  
Fiddler Crab ◽  
Carapace Width ◽  
The Body ◽  
Brazilian Population ◽  
The South ◽  
Western Atlantic ◽  
Males And Females ◽  
Uca Uruguayensis

Some crustaceans show variations of their reproductive biology within their geographical distribution, and knowledge about such variations is important for the comprehension of their reproductive adaptations. This study compared two populations of the fiddler crab Uca uruguayensis from two locations on the south-western Atlantic coast: Ubatuba Bay, São Paulo, Brazil and Samborombón Bay, Buenos Aires, Argentina. The population features analysed were the body size variation (carapace width = CW) and the size at the onset of sexual maturity (SOM) in order to test the hypothesis that the size at SOM, should be the same in relative terms (RSOM), independently of the latitudinal position. In the Brazilian population the CW ranged from 4.18 to 11.60 mm for males and 3.90 to 9.80 mm for females, and in the Argentinean population from 3.60 to 14.10 mm for males and 2.85 to 12.00 mm for females. In the Brazilian population the SOM was 7.1 (RSOM = 0.58) and 5.9 mm CW (RSOM = 0.57) for males and females, respectively, and in the Argentinean population it was 7.0 (RSOM = 0.42) and 6.75 mm CW (RSOM = 0.53) for males and females, respectively. This fact is probably related to a great plasticity in the life history features of Uca uruguayensis under different environmental conditions.

scholarly journals MORPHOLOGICAL VARIABILITY AND SEXUAL DIMORPHISM OF NOBLE CRAYFISH Astacus astacus FROM THE BALKANA LAKE

2020 ◽  
Vol 10 (2) ◽  
Author(s):  
Rajko Roljić ◽  
Vera Nikolić ◽  
Nebojša Savić
Keyword(s):  
Carapace Width ◽  
Morphological Variability ◽  
The Body ◽  
Sex Dimorphism ◽  
Morphometric Characteristics ◽  
Astacus Astacus ◽  
Baited Traps ◽  
Noble Crayfish ◽  
Cephalothorax Length ◽  
Males And Females

This paper presents the information about morphological variability and sex dimorphism of the Noble crayfish (Astacus astacus) in the area of the Balkana Lake in Mrkonjic Grad. The crayfish were caught by hand made baited traps from October 9nd 2018. until May 31th 2019. A total of 58 crayfish were caught, of which 38 males and 20 females. The eight morphometric characteristics: body weight (W), body length (TBL), claw length (CLL), cephalothorax length (CFL), carapace width (CPW), abdomen length (ABL), rostrum length (ROL) and rostrum width (ROW) were measured, both in males and females. Also, the body condition was determined for all specimens. The results of morphometric characteristics partially matched into the already known range of variations. These data represent first ones for the observed area. The t-test showed that there were significant differences between the sexes in W, TBL, CLL, CFL and CPW which are explained by the emphasized sex dimorphism of the noble crayfish.

scholarly journals Studi perbandingan adaptasi Kura-Kura Pipi Putih (Siebenrockiella crassicollis) jantan dan betina di area Kolam Konservasi Universitas Bengkulu

2019 ◽  
Vol 3 (1) ◽  
pp. 33-39
Author(s):  
Julita Pasaribu ◽  
Aceng Ruyani ◽  
Hery Suhartoyo
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Carapace Length ◽  
Growth Parameters ◽  
Carapace Width ◽  
Weight Growth ◽  
Measurement Results ◽  
Males And Females ◽  
Three Space

ABSTRACT[Adaptation study of Pipi Putih (Siebenrockiella crassicolli) sexes in conservation pond at University of Bengkulu]. This study aims to compare the adaptability of Pipi Putih turtles (Siebenrockiella crassicollis) of males and females in the conservation pond area of University of Bengkulu (UNIB). Nine S.crassicollis were kept individually in a cage, consisting of three space at three different point. S.crassicollis were fed with kangkung (Ipomea aquatica) as much as 10% of  their body weight. Growth parameters was collected every week for six weeks : (a) weight gain (WG); (b) thick growth of body (TGB); (c) growth of carapace length (GCL), (d) growth of carapace width (GCW); (e) growth of plastron length (GPL)  and (f) plastron width growth (PWG)  The measurement results show: (a) WG: male = 3.50%, female = 2.01% (b) TGB: male = 0.30%, female = -0.05%; (c) GCL: male = 0.16, female = 0.26%, (d) GCW : male = 0.566%, female = 0.47% (e) GPL: male = 0.28%, female = 0, 27% and (f) PWG: male = 1.25%, female = 1.16%. Mean turtle growth percentage of all indicators: male S. crassicollis = 0.01% and 0.69% for female S. crassicollis. We concluded that the adaptability of male S. crassicollis turtles was higher than for female S. crassicollis. Keywords: Conservation; Siebenrockiella crassicollis; turtle; adaptation.(Received August 16, 2018; Accepted January 19, 2019; Published February 26, 2019) ABSTRAKPenelitian ini bertujuan untuk membandingkan kemampuan adaptasi kura-kura pipi putih (Siebenrockiella crassicollis) jantan dan betina di area kolam konservasi Universitas Bengkulu (UNIB). Sembilan ekor S.crassicollis dipelihara secara individu di dalam kerambah. Terdapat tiga kerambah yang diletakkan pada tiga titik berbeda. Kangkung (Ipomea aquatica) merupakan pakan yang diberikan sebanyak 10% dari berat badan. Pengambilan data dilakukan sekali seminggu selama enam pekan. Parameter pertumbuhan yang diamati adalah (a) pertumbuhan berat badan (PBB); (b) pertumbuhan tebal badan (PTB); (c) pertumbuhan panjang karapaks (PPK), (d) pertumbuhan lebar karapaks (PLK); (e) pertumbuhan panjang plastron (PPP) dan (f) pertumbuhan lebar plastron (PLP). Hasil pengukuran menunjukkan: (a) PBB: jantan = 3,50 %, betina = 2,01% (b) PTB: jantan =  0,30 %, betina = -0,05% ; (c) PPK : jantan =  0,16, betina = 0,26 %, (d) PLK : jantan = 0,566%, betina = 0,47%  (e) PPP: jantan = 0,28%, betina = 0,27%  dan (f) PLP: jantan = 1,25%, betina = 1,16%. Rata-rata persen pertumbuhan kura-kura dari seluruh indikator: S.crassicollis jantan = 0,01% dan 0,69% untuk S.crassicollis betina. Berdasarkan data yang diperoleh,disimpulkan bahwa tingkat adaptasi kura-kura S.crassicollis jantan lebih tinggi daripada S. crassicollis betina. Kata kunci: Konservasi; Siebenrockiella crassicollis; kura-kura; adaptasi. 

scholarly journals Short Communication: Biological aspects of Charybdis anisodon (De Haan, 1850) in Lasongko Bay, Central Buton, Southeast Sulawesi, Indonesia

2018 ◽  
Vol 19 (5) ◽  
pp. 1755-1762 ◽  
Author(s):  
ABDUL HAMID ◽  
YUSLI WARDIATNO
Keyword(s):  
Body Weight ◽  
Sex Ratio ◽  
Carapace Length ◽  
Short Communication ◽  
Carapace Width ◽  
Spawning Season ◽  
Growth Type ◽  
Size Growth ◽  
Males And Females ◽  
Biological Aspects

Hamid A, Wardiatno Y. 2018. Short Communication: Biological aspects of Charybdis anisodon (De Haan, 1850) in Lasongko Bay, Central Buton, Southeast Sulawesi, Indonesia. Biodiversitas 19: 1755-1762. Data on the biological aspects of Charybdis anisodon (De Haan, 1850) were still very limited. This study was aimed to determine the distribution of size, growth type, sex ratio and spawning season of C. anisodon in Lasongko Bay, Central Buton, Southeast Sulawesi. Crab collection was conducted from May 2013 to March 2014 using a crab gillnet. The carapace width of males and females C. anisodon ranged between 3.05-7.61 cm and 3.45-7.98 cm, respectively. Mann-Whitney test showed that width and length of carapace of males and females were significantly different (p<0.05). Type of growth of carapace width-body weight male and female were both allometric negative. Carapace length-body weight relationships of the males was isometric, but it was allometric negative for females. Spatially and temporally, the sex ratio of C. anisodon showed a variation, and the total sex ratio was 1: 0.38. The spawning season of C. anisodon tend to occur throughout the year.

scholarly journals Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil

2005 ◽  
Vol 48 (1) ◽  
pp. 139-145 ◽  
Author(s):  
Glaucia Dalabona ◽  
Jayme de Loyola e Silva ◽  
Marcelo Antonio Amaro Pinheiro
Keyword(s):  
Sexual Dimorphism ◽  
Sexual Maturity ◽  
Carapace Length ◽  
Carapace Width ◽  
Southern Brazil ◽  
Monthly Basis ◽  
Ucides Cordatus ◽  
Size At Sexual Maturity ◽  
Males And Females ◽  
One Year

Morphometry and maturity of Ucides cordatus were analyzed with males and females collected during one year on a monthly basis at Laranjeiras Bay, Paraná State, Brazil. Carapace length, chelipeds propodus length and abdominal width were measured and related to carapace width to verify sexual dimorphism and size at morphological maturity of each sex. Carapace and propodus length of larger and smaller cheliped presented difference between sexes, confirming the use of both as secondary sexual characters. MATURE II program indicated 44mm and 43mm of carapace width to represent the size at sexual maturity of males and females, respectively.

scholarly journals Body Weight, Carapace Length and Width Relationship and Condition Factor of the Mud Crab Scylla serrata (Forskal) in Mangrove Ecosystem

2017 ◽  
Vol 9 (3) ◽  
pp. 338-343 ◽  
Author(s):  
Sarvabhowma Chakravarty MYLA ◽  
Vijaya Bharathi TIRUMANI ◽  
Rama Chandra Ganesh PATURI
Keyword(s):  
Carapace Length ◽  
Condition Factor ◽  
Carapace Width ◽  
Scylla Serrata ◽  
Regression Equations ◽  
Allometric Growth ◽  
Mud Crab ◽  
Relative Condition Factor ◽  
Males And Females ◽  
Relationship Of

The relationship of length-weight and width-weight of the carapace and the relative condition factor of mud crab Scylla serrata from Coringa Wildlife Sanctuary (Andhra Pradesh, India) was the subject of present study. Significant difference in both males and females was observed between carapace length-weight, carapace width-weight with a linear relationship. The regression values of both the sexes were found to be statistically significant. The regression equations calculated for length-weight were W= 0.00000178 L 3.1139 (r= 0.95) for males, W= 0.00000520 L 2.8056 (r=0.94) for females and for sexes combined it was W = 0.0000297 L 2.9891(r= 0.94).  In case of carapace width-weight relationship of males, females and sexes combined the regression equations were W= 0.00000121 CW 3.0426 (r= 0.92), W= 0.00000178 CW 2.775 (r=0.93) and W = 0.00000204 CW 2.9210(r= 0.92) respectively. The male crabs showed positive allometric growth whereas female had negative allometric growth. Analysis of covariance confirmed remarkable difference between males and females in the growth pattern. The mean relative condition factor (Kn values) of both males and females and of the pooled sexes ranged from 0.680 (April) to 1.029 (November). A gradual raise in Kn values was observed from small- to big- sized crabs in both the sexes. Peak values were observed in 12.0-13.9 cm size group in November.

scholarly journals Morphometric characteristics of crayfish, Cherax gherardiae, from Maybrat, West Papua, Indonesia

2018 ◽  
Vol 26 (4) ◽  
pp. 223-230
Author(s):  
Yulianus Sedik ◽  
Dominggus Rumahlatu ◽  
Bambang Irawan ◽  
Agoes Soegianto
Keyword(s):  
Sexual Dimorphism ◽  
Sex Ratio ◽  
Carapace Length ◽  
Condition Factor ◽  
Carapace Width ◽  
Allometric Growth ◽  
Morphometric Characteristics ◽  
Significant Difference ◽  
West Papua ◽  
Males And Females

Abstract The objectives of this study were to determine the length-weight relationships (LWRs), chelae length (ChL)-width (ChW) relationships, carapace length (CL)-width (CW) relationships, sexual dimorphism, and condition factor (K) of Cherax gherardiae from Maybrat, West Papua Indonesia. The sex ratio of C. gherardiae was found to be 1.04:1. The LWRs for males, females, and all individuals were W = 0.225L1.96, W = 0.181L2.02, and W = 0.187L2.03, respectively. Males and females exhibited negative allometric growth (b<3). There was no significant difference in lengths between males and females; however, the weight of males was greater than that of females. The K values for males, females, and all individuals were 3.17, 3.09, and 3.13, respectively. The ChL of the crayfish ranged from 1.0 to 7.5 cm, and the ChW ranged from 0.4 to 2.5 cm. The CL of crayfish ranged from 1.6 to 6.0 cm, and the CW ranged from 0.6 to 4.1 cm. Males had longer chelae and carapaces than did females. There was no significant difference in chelae width or carapace width between males and females. The ChL-ChW relationships for males, females, and all individuals were ChW = 0.312ChL + 0.260, ChW = 0.397ChL - 0.050, and ChW = 0.345ChL + 0.119, respectively. The CL-CW relationships for males, females, and all individuals were CW = 0.750CL-0.955, CW = 0.526CL - 0.178, and CW = 0.635CL-0.543, respectively.

scholarly journals Taxonomy, length-weight relationship, food and feeding habits of flower moon crab Matuta planipes Fabricius, 1798 from coastal waters of Gopalpur, Odisha, India

2017 ◽  
Vol 64 (3) ◽  
Author(s):  
Durga Prasad Behera ◽  
S. Y. Tenjing ◽  
Rocktim Ramen Das ◽  
Laxman Nayak ◽  
D. Mohapatra
Keyword(s):  
Coastal Waters ◽  
Carapace Length ◽  
Feeding Habits ◽  
Carapace Width ◽  
Total Weight ◽  
Linear Pattern ◽  
Food And Feeding ◽  
Males And Females ◽  
Relationship Of ◽  
The Relationship

The relationship between carapace length (CL), carapace width (CW) and total weight (TW) in the flower moon crab Matuta planipes Fabricius, 1798 was studied and found to be CL = 0.144+1.319 CW and CL = 0.356+1.273 CL for males and females respectively. In case of the carapace width and total weight, the relationships were: TW = 0.272 CW3.011 and TW = 0.474 CW2.555 for males and females respectively. The relationships of carapace length and total weight were: TW = 0.128 CL2.917 for males and TW = 0.184 CL2.650 for females. A linear pattern was found between the relationship of CL and CW for M. planipes, whereas a curvilinear pattern was found between the relationship of CL/CW and TW in the present study. It was also observed that M. planipes is an opportunistic omnivore, seaweed being the most dominant food item followed by crustaceans, seagrass, amphipods and miscellaneous matter.

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