Stable isotope compositions of dominant zooplankton species in relation to environmental factors in the Dardanelles

Uzundumlu, Sinan; Büyükateş, Yeşim

doi:10.2298/abs181003059u

Cited by 2 publications

(1 citation statement)

References 49 publications

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“…Under the influence of the northerly winds the ZFCC can be extended to the southern Taiwan Strait in winter and spring, while the TWC controlled most of the scECS in summer and autumn. Different marine environmental characteristics can cause differences in stable isotope ratio of food sources since the origins of carbon sources and other nutrients varied (Uzundumlu and Büyükateş, 2019), and then affect the stable isotope composition of consumers. Our observation shows that the seasonal variation of water mass is quite consistent with the variation of δ 13 C. Generally, the δ 13 C value in the area affected by TWC is relatively stable, while the area affected by ZFCC is more complicated due to the joint influence of terrestrial-derived carbon and marine-derived carbon.…”

Section: Isotopic Variations and Trophic Position Of Bombay Duckmentioning

confidence: 99%

Trophic Plasticity of Bombay Duck (Harpadon nehereus) in the South-Central East China Sea Based on Stable Isotope Evidence

et al. 2021

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High trophic plasticity is often invoked to explain the successful expansion of many aquatic species. Bombay duck (BD) outcompete other traditionally commercial fishes in the East China Sea (ECS) in recent years, displaying a continuous and sharp increase of catches, however, little is known whether the competition advantage of BD was related to its trophic plasticity. Using stable isotope analysis (SIA), we investigated the trophic ecology of BD in the south-central ECS in two periods. Significant differences in δ13C and δ15N values were found between sampling months and among body sizes. Modal (95% credibility limits) estimation showed that BD’s trophic position (TP) gradually increased from 3.56 (3.31–3.82) in G1 (120–150 mm for body size) to 4.09 (3.69–4.50) in G5 (241–270 mm) in November, and from 3.37 (2.92–3.88) in G2 (151–180 mm) to 3.66 (3.07–4.23) in G4 (211–240 mm) in April, respectively, suggesting obvious ontogenetic variation of δ15N and TP. More importantly, the TP of BD within the same body size showed wide amplitude, indicating BD possess high trophic plasticity, and can capture prey from low to high trophic levels. Further quantitative analysis based on the MixSIAR model showed that BD mainly fed on zooplankton and fish, but its feeding habit was characterized by the consumption of gradually reduced zooplankton and increased fish associated with increased body size. Interestingly, the fish’s contribution to BD showed obvious seasonal variation. It can be explained by varied food availability in ECS. Relatively low fish prey in April forced BD to adjust its diet, adding the ingestion of shrimps and cephalopods corresponding to temporal variations in food availability. The present study provides the evidence that high trophic plasticity exists in the feeding strategy of BD, which is reflected in the ability to adjust the feeding preference according to nutritional needs and food environmental changes; thus, it is competitively advantageous and may partly explain why BD is becoming the predominant species and displays an extensive distribution in the ECS.

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Section: Isotopic Variations and Trophic Position Of Bombay Duckmentioning

confidence: 99%

Trophic Plasticity of Bombay Duck (Harpadon nehereus) in the South-Central East China Sea Based on Stable Isotope Evidence

et al. 2021

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Current Status of Critically Endangered Fan Mussel Pinna nobilis (Linnaeus 1758) Population in Çanakkale Strait, Turkey

Acarlı¹,

Acarlı²,

Kale³

2021

Marine Science and Technology Bulletin

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The population of Pinna nobilis (Linnaeus, 1758) has been severely damaged, especially by the effect of the disease, in addition to the causes such as fishing activities, overexploitation, environmental pollution, habitat degradation, tourism, and human impacts. Particularly, Haplosporidium pinnae caused gigantic destruction in the P. nobilis population. Accordingly, the present study aimed to determine the current status of the P. nobilis populations in the Çanakkale Strait. Samplings were carried out between July and August 2020 at 9 different stations in the Çanakkale Strait. The results revealed that mass mortality was observed at the two stations (Abide Beach and Kumkale Village Beach) located near the Aegean Sea. On the other hand, it has been determined that the lowest mortality rate (9.62%) has been found at Ilgardere station. Juvenile individuals have been observed in healthy and uninfected populations with high survival rates. This paper is the first document on the spatial distribution of P. nobilis in Çanakkale Strait. Therefore, the P. nobilis population should be continuously monitored to ensure the sustainability of the species.

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Stable isotope compositions of dominant zooplankton species in relation to environmental factors in the Dardanelles

Cited by 2 publications

References 49 publications

Trophic Plasticity of Bombay Duck (Harpadon nehereus) in the South-Central East China Sea Based on Stable Isotope Evidence

Trophic Plasticity of Bombay Duck (Harpadon nehereus) in the South-Central East China Sea Based on Stable Isotope Evidence

Current Status of Critically Endangered Fan Mussel Pinna nobilis (Linnaeus 1758) Population in Çanakkale Strait, Turkey

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