Güney Karadeniz’de Mnemiopsis leidyi ve Predatörü Beroe ovata’nın Mevsimsel Boy–Ağırlık İlişkileri

Abstract

Karadeniz pelajik besin ağı biyolojik istilalarla yeniden yapılanırken, bölgesel ısınma ve denizel sıcak hava dalgaları jelatinimsi tüketicilerin mevsimsel ortaya çıkış pencerelerini değiştirmektedir. Bu nedenle, hızla toplanan boy verilerini biyokütleye dönüştürmek için boy–yaş ağırlık ilişkilerine (LWR) ihtiyaç vardır; ancak bu ilişkiler vücut biçimine, mevsime ve veri işleme yöntemine duyarlıdır. Bu çalışmada, Sinop kıyılarından 2018 yılında toplanan veri seti, istilacı loplu ktenofor Mnemiopsis leidyi ve onun ktenofor predatörü Beroe ovata için biyometrik yönden analiz edilmiştir. Gerçekleştirilen mevsimsel plankton çekimleri 1–45 m derinlikler arasında olup; canlı bireylerin toplam boyu ve hacimsel ağırlığı kaydedilmiştir. Toplam 1.187 M. leidyi ve 569 B. ovata için boy–ağırlık verisi alınmıştır. Ortalama boy ve yaş ağırlık M. leidyi için 2,981 ± 0,053 cm ve 6,621 ± 0,211 g; B. ovata için 3,895 ± 0,071 cm ve 5,893 ± 0,247 g olarak hesaplanmıştır. Türler için boy-ağırlık ilişkisi modelleri sırasıyla W = 0,7503L¹·⁶⁷⁵¹ (b için %95 GA: 1,636–1,714; R² = 0,859) ve W = 0,2081L²·²⁵¹⁹ (2,181–2,322; R² = 0,874) sonuçlarını vermiş; eğimler anlamlı olarak farklı bulunmuştur (ANCOVA etkileşimi: F₁,₁₇₅₂ = 129,64, p < 0,001). Denklemler iklimsel nedenselliğe kesin bir kanıt oluşturmamakla beraber Güney Karadeniz için yeniden üretilebilir bir biyometrik referans sunmaktadır. Gelecekteki izleme çalışmaları, ktenofor fenolojisi ve biyokütlesindeki iklim kaynaklı değişimleri açıklığa kavuşturmak amacıyla sıcaklık, tuzluluk, çözünmüş oksijen, besin yoğunluğu ve ağ çekimi sırasında süzülen su hacmine ilişkin verileri birlikte değerlendirmelidir.

Keywords

• Mnemiopsis leidyi
• Beroe ovata
• boy-ağırlık ilişkisi
• iklim değişikliği
• Karadeniz

Seasonal Length–Weight Relationships of Mnemiopsis leidyi and Its Predator Beroe ovata in the Southern Black Sea

Abstract

The Black Sea pelagic food web has been reorganized by biological invasion while regional warming and marine heatwaves are altering the seasonal windows for gelatinous consumers. Length–wet weight relationships (LWRs) are therefore needed to convert rapidly collected size data into biomass, but they are sensitive to body form, season and data handling. 2018 dataset from the Sinop coast for the invasive lobate ctenophore Mnemiopsis leidyi and its ctenophore predator Beroe ovata. Seasonal daytime plankton tows covered 1–45 m depth; live total length and individual displacement volume were recorded. A total 1,187 M. leidyi and 569 B. ovata positive length–weight were recorded. Mean length and wet weight were 2.981 ± 0.053 cm and 6.621 ± 0.211 g for M. leidyi, and 3.895 ± 0.071 cm and 5.893 ± 0.247 g for B. ovata. Pooled log-linear models gave W = 0.7503L¹·⁶⁷⁵¹ (95% CI for b: 1.636–1.714; R² = 0.859) and W = 0.2081L²·²⁵¹⁹ (2.181–2.322; R² = 0.874), respectively; the slopes differed (ANCOVA interaction: F₁,₁₇₅₂ = 129.64, p < 0.001). The equations provide a reproducible southern Black Sea biometric baseline, not evidence of climate causality. Future monitoring should combine with temperature, salinity, dissolved oxygen, prey, tow-water volume resolve climate-driven changes in ctenophore phenology and biomass.

Keywords

• Mnemiopsis leidyi
• Beroe ovata
• length–wet weight relationship
• climate warming
• Black Sea

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