A study on the morphometric characteristics of<i>Astacus leptodactylus</i>inhabiting the Thrace region of Turkey

Deniz, Tomris; Harlıoğlu, Muzaffer Mustafa; Deval, Mehmet Cengiz

doi:10.1051/kmae/2010021

Cited by 8 publications

(2 citation statements)

References 21 publications

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“…Having the information on the sex ratio in population is significant because it tells us about the health and stability of the population (Jurković, 2016). Unbalanced sex ratio may be caused by biased sampling (Deniz et al, 2010), but also several biological factors, such as: unequal sex ratio after hatching, differentiation of immigration, and emigration of individuals of different sex. Uneven sex ratio can be a consequence of differences in the activity between different sex (Dakić & Maguire, 2016), differences in the age of reaching sexual maturity, but also different life expectancy of individuals of different sexes.…”

Section: Resultsmentioning

confidence: 99%

Morphometric characteristics and condition indices of stone crayfish Austropotamobius torrentium (Shrank, 1803) from the Mlinska River

Roljić

Dekić

Jurida

et al. 2022

AGR

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Regarded as a protected species on the IUCN list of endangered species, and classified as data deficient species, the stone crayfish (Austropotamobius torrentium) is one of the five European species from the Astacidae family that lives in freshwater ecosystems across Bosnia and Herzegovina. The aim of this study was to investigate the variability of selected morphometric characteristics of male and female crayfish of the A. torrentium species from the upper reaches of the Mlinska River. The crayfish were sampled in June 2021 when 62 individuals (22 males and 40 females) were caught. They were analyzed fresh in the field and in the laboratory. The treatment included the measurement of 12 morphometric features: total body length (TBL), weight (W), claw length (CLL), claw width (CLW), carapace length (CPL), carapace width (CPW), rostrum length (ROL), rostrum width (ROW), abdominal length and width (ABL, ABW) and telson length and width (TEL, TEW). The mean body length ± SD was 79.05 ± 7.35 in males and 60.54 ± 10.03 mm in females. The mean recorded body weight ± SD was 17.51 ± 8.3 g in males and 7.02 ± 4.41 g in females. Using the linear regression method, a positive correlation was found between body length and weight (♂ R2=0.7644; ♀ R2=0.8222), body weight and claws length (♂ R2=0.876; ♀ R2=0.9661), as well as carapace width and body length (♂ R2=0.7216; ♀ R2=0.8411). Using the T-test, a statistically significant difference of the analyzed morphometric parameters was found between the sexes, which is explained by the pronounced sexual dimorphism of stone crayfish. The calculated values for Condition factor and the Crayfish constant indicate that the males are of better fitness, which is in line with the results of previous research in Europe. Data presented in this paper can serve as a basis for further research of A. torrentium in this area.

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Section: Resultsmentioning

confidence: 99%

Morphometric characteristics and condition indices of stone crayfish Austropotamobius torrentium (Shrank, 1803) from the Mlinska River

Roljić

Dekić

Jurida

et al. 2022

AGR

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“…Balık, Ustaoğlu, Sarı, and Berber (2006) and Berber and Mazlum (2009) investigated spawning efficiency. Deniz (Bök), Harlıoğlu, and Deval (2010) and Deniz (Bök), Aydın, and Ateş (2013) investigated morphological characteristics of A. leptodactylus. Aydin, Harlıoğlu, and Deniz (2015) investigated biological and population characteristics of A. leptodactylus.…”

Section: Introductionmentioning

confidence: 99%

Untitled

Berber¹,

Kale²

2018

Turk. J. Fish. Aquat. Sci.

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The objective of this study was to determine whether the freshwater crayfish (Astacus leptodactylus Eschscholtz, 1823) rearing can be economically achieved in the rice fields using meta-analysis. For this purpose, 100 juvenile freshwater crayfishes were settled in each of three cages in the rice field and the survival and growth characteristics of juvenile freshwater crayfishes in the rice fields were evaluated for 68 days. The meta-analysis was performed to the present study and nineteen studies where researchers evaluated the survival and growth characteristics of juvenile freshwater crayfish. As a result, initial average length and weight of the individuals were 11.08±0.097 mm and 0.04±0.003 g, respectively. They reached to a total of 37.46±0.872 mm length and an average of 1.46±0.095 g weight after 68 days. During this period, the survival rate of the juvenile individuals was also determined as 64.67%. The meta-analysis showed that growth in length at a significant rate on the contrary growth in weight. In conclusion, it is suggested that freshwater crayfish rearing in rice fields is a new and applicable alternative method for growth of freshwater crayfish in Turkey.

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Morphological diversity of the stone crayfish − traditional and geometric morphometric approach

Lovrenčić

Pavić

Majnarić

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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Austropotamobius torrentium is one of four native European crayfish species inhabiting Croatian freshwaters. Existence of eight divergent monophyletic mtDNA phylogroups was described within A. torrentium; six of them are distributed in Croatia, with the highest genetic diversity established in its northern-central Dinaric region. Recent small-scale study of the stone crayfish morphological variability indicated significant differences among different phylogroups. In the present study larger sample size, covering populations from five phylogroups, was analysed with the aim of determining whether there are morphological characteristics that reliably separate stone crayfish from different phylogroups. Aiming this, 245 stone crayfish were analysed through traditional (TM) and, for the first time, geometric morphometric (GM) analyses. Multivariate discriminant analyses included 24 TM characteristics per crayfish, while GM comprised analyses of 22 landmarks on the dorsal side of cephalon. Both methods revealed congruent results, and significant differences among phylogroups in analysed features were obtained, with the cephalon shape contributing the most to crayfish discrimination. Research confirmed that both approaches, combined with statistical methods, are useful in distinguishing and separating crayfish phylogroups. Findings of present study are compatible with the previous molecular findings; stone crayfish present several distinct evolutionary lineages whose species status are currently undefined and require urgent clarification.

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A study on the morphometric characteristics ofAstacus leptodactylusinhabiting the Thrace region of Turkey

Cited by 8 publications

References 21 publications

Morphometric characteristics and condition indices of stone crayfish Austropotamobius torrentium (Shrank, 1803) from the Mlinska River

Morphometric characteristics and condition indices of stone crayfish Austropotamobius torrentium (Shrank, 1803) from the Mlinska River

Untitled

Morphological diversity of the stone crayfish − traditional and geometric morphometric approach

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