Estimating age structure of Liocarcinus depurator along the western Black Sea coast of Türkiye using the Bhattacharya method

Year 2025, Volume: 10 Issue: 6, 825 - 831

Ahmet Mutlu Gözler , Aziz Gümüşler , Erhan Çiloğlu

https://doi.org/10.35229/jaes.1773741

Abstract

A total of 2.233 Liocarcinus depurator samples were collected during beam trawl surveys along the northwestern Black Sea coast of Türkiye to analyse the population's age structure. The male-to-female ratio is 2:1. Length-frequency distributions were estimated for four age groups using the Bhattacharya method, with carapace lengths of 0+ = 15.51 mm, I+ = 23.76 mm, II+ = 31.29 mm, and III+ = 36.49 mm for males, and 0+ = 15.35 mm, I+ = 21.36 mm, II+ = 27.18 mm, and III+ = 30.50 mm for females. For all sexes combined, lengths were 0+ = 15.35 mm, I+ = 22.65 mm, II+ = 30.81 mm, and III+ = 36.59 mm. One-way ANOVA showed significant differences in mean length among age groups for the pooled sample, as well as for males and females separately (all p < 0.001). Independent t-tests found no significant difference between sexes in age group 0 (p = 0.59), but significant differences in age groups I, II, and III (p < 0.05 for all). Males were generally larger than females in older age groups, indicating apparent sexual dimorphism and different growth patterns in the population.

Keywords

Age structure , Bhattacharya method , Liocarcinus depurator , Sexual dimorphism , Turkish Black Sea coast

Ethical Statement

We declare that our research, the details of which are provided above, is among studies that do not require ethical committee approval.

Supporting Institution

Recep Tayyip Erdogan University

Project Number

RTEU BAP FYL 2018-856

Thanks

We want to express our deepest gratitude to the crew of the “Black Sea Research” vessel for their assistance and support in this project.

Bhattacharya yöntemi kullanılarak Türkiye'nin Batı Karadeniz kıyılarında Liocarcinus depurator'un yaş yapısının tahmini

Abstract

Türkiye'nin kuzeybatı Karadeniz kıyılarında, popülasyonun yaş yapısını belirlemek amacıyla, toplam 2.233 Liocarcinus depurator bireyleri, beam trol operasyonları toplanmıştır. Erkek-dişi oranı 2:1 dir. Bhattacharya yöntemi kullanılarak dört yaş grubu için uzunluk-frekans dağılımları tahmin edildi; erkekler için kabuk uzunlukları 0+ = 15,51, I+ = 23,76, II+ = 31,29 ve III+ = 36,49 mm; dişiler için 0+ = 15,35, I+ = 21,36, II+ = 27,18 ve III+ = 30,50 mm olarak belirlenmiştir; birleşik cinsiyetler için toplam uzunluklar 0+ = 15,35, I+ = 22,65, II+ = 30,81 ve III+ = 36,59 mm olarak belirlenmiştir. Tek yönlü ANOVA, birleştirilmiş örneklemde ve ayrıca dişiler ve erkekler için ayrı ayrı yaş grupları arasında ortalama uzunlukta önemli farklılıklar olduğunu göstermiştir (tümü p <0,001). Bağımsız t-testleri, yaş grubu 0+'da cinsiyetler arasında önemli bir fark olmadığını ortaya koyarken (p = 0,59), yaş grupları I+, II+ ve III+'da önemli farklılıklar gözlemlenmiştir (tüm karşılaştırmalar için p < 0,05). Erkekler, genel olarak yaşlı kohortlarda dişilerden daha büyüktü, bu da popülasyonda belirgin cinsel dimorfizm ve farklı büyüme modellerini yansıtmaktadır.

Keywords

Yaş yapısı , Bhattacharya metodu , Liocarcinus depurator , Eşeysel dimorfizm , Türkiye Karadeniz kıyıları

Ethical Statement

Yukarıda bilgileri yer almakta olan araştırmamızın etik kurul izni gerektirmeyen çalışmalar arasında yer aldığını beyan ederiz.

Supporting Institution

Recep Tayyip Erdoğan Üniversitesi

Project Number

RTEU BAP FYL 2018-856

Thanks

Bu projede yardım ve desteklerinden dolayı “Karadeniz Araştırmaları” gemisinin mürettebatına en derin şükranlarımızı sunarız.

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