Fauna of Anemonefishes (Pomacentridae, Amphiprioninae) and Their Host Sea Anemones (Cnidaria, Actiniaria) of the Hon Rom Coral Reefs (Southern Central Vietnam, Nha Trang Bay) and its Changes for the Period from 2003 to 2018

IF 0.5 4区生物学 Q4 FISHERIES Journal of Ichthyology Pub Date : 2024-06-25 DOI:10.1134/s0032945224700085

D. A. Astakhov, Nguyen Thi Hai Thanh, A. V. Mishin

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Abstract

The fauna of the anemonefishes (Pomacentridae, Amphiprioninae) and their host sea anemones , inhabiting the detached coral reef of the Hon Rom Island, has been first described. Changes in faunas of these groups over 2003–2018 were traced. The species (qualitative) composition of these groups did not change over the period indicated above. It includes four anemonefish species: Amphiprion clarkii, A. frenatus, A. perideraion, and A. sandaracinos and six sea anemone species symbiotic with them: Entacmaea quadricolor, Stichodactyla mertensii, Heteractis aurora, H. crispa, H. magnifica, and H. malu. Four of these host sea anemone species (S. mertensii, H. magnifica, E. quadricolor, and H. crispa) belong to the principal host sea anemones of the reef anemonefishes, i.e. ensure the long-term existence of spawning pairs of symbiont fishes . However, quantitative changes in the faunas of the study groups have occurred. Two host sea anemone species (S. mertensii and H. magnifica) and mature anemonefishes inhabiting them were recorded each year in the observation period. The number of the sea anemones S. mertensii reduced by two thirds to 2018, compared to that in 2003–2005, and 100% of adult A. sandaracinos disappeared, while the number of adult A. clarkii within the study sea anemone species reduced by one third. The number of sea anemones H. magnifica reduced by 20% until 2018, compared to that in 2003–2010; 40% of adult A. perideraion disappeared. At least a threefold decrease in the pairs number of the anemonefish A. frenatus within the sea anemones E. quadricolor was observed; pairs of the anemonefish A. clarkii replaced them. It has been shown that there is no displacement of spawning pairs of A. sandaracinos, A. perideraion, and A. frenatus, respectively, from their host sea anemones S. mertensii, H. magnifica, and E. quadricolor, but there is replacement of these anemonefish species in the fish-free sea anemones by another anemonefish species—A. clarkii.

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Hon Rom 珊瑚礁（越南中南部，芽庄湾）的无须鳕（Pomacentridae, Amphiprioninae）及其寄主海葵（Cnidaria, Actiniaria）的动物群及其在 2003 年至 2018 年期间的变化情况

摘要首次描述了栖息在红岩岛离群珊瑚礁上的海葵鱼（Pomacentridae, Amphiprioninae）及其寄主海葵的动物群落。追溯了 2003-2018 年间这些类群的动物群变化。这些类群的物种（质量）组成在上述期间没有发生变化。其中包括四种无须鳕：Amphiprion clarkii、A. frenatus、A. perideraion 和 A. sandaracinos，以及与它们共生的六个海葵物种：Entacmaea quadricolor、Stichodactyla mertensii、Heteractis aurora、H. crispa、H. magnifica 和 H. malu。其中四种寄主海葵（S. mertensii、H. magnifica、E. quadricolor 和 H. crispa）属于珊瑚礁海葵鱼类的主要寄主海葵，即确保产卵对共生鱼类的长期存在。然而，研究组群的动物群发生了量变。在观察期间，每年都会记录两种寄主海葵（S. mertensii 和 H. magnifica）和栖息在其中的成熟海葵鱼类。到 2018 年，海葵 S. mertensii 的数量比 2003-2005 年减少了三分之二，成体 A. sandaracinos 100%消失，而在研究的海葵物种中，成体 A. clarkii 的数量减少了三分之一。到 2018 年，海葵 H. magnifica 的数量比 2003-2010 年减少了 20%；40%的 A. perideraion 成体消失。在海葵 E. quadricolor 中观察到的海葵鱼 A. frenatus 的成对数量至少减少了三倍，取而代之的是成对的海葵鱼 A. clarkii。研究结果表明，在无鱼海葵中，A. sandaracinos、A. perideraion 和 A. frenatus 的产卵对并没有分别从其寄主海葵 S. mertensii、H. magnifica 和 E. quadricolor 中移出，而是被另一种海葵--A. clarkii 取代。

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来源期刊

Journal of Ichthyology Multiple-

CiteScore

1.00

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28.60%

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期刊介绍： Journal of Ichthyology is an international peer-reviewed journal published in collaboration with the Russian Academy of Sciences. It covers original studies in fish taxonomy, evolution, molecular biology, morphology, species diversity, zoological geography, genetics, physiology, ecology, behavior, reproduction, embryology, invasions, and protection. Some problems of applied ichthyology are also covered. The journal welcomes manuscripts from all countries in the English or Russian language.