Diet niche segregation of co-occurring larval stages of mesopelagic and commercially important fishes in the Osumi Strait assessed through morphological, DNA metabarcoding, and stable isotope analyses

Kume, Gen; Kobari, Toru; Hirai, Junya; Kuroda, Hiroumi; Takeda, Tsutomu; Ichinomiya, Mutsuo; Komorita, Tomohiro; Aita-Noguchi, Maki; Hyodo, Fujio

doi:10.1007/s00227-020-03810-x

Cited by 18 publications

(13 citation statements)

References 60 publications

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“…The possible reasons were as follows. First, small organisms or digested organisms are too di cult to identify using a microscope (Dromard et al 2015;Kume et al 2021). In this study, microscopic examination found a large amount of detritus in the sh intestinal contents (data not shown).…”

Section: Discussionmentioning

confidence: 60%

Characteristics of Macroalgal Consumption by Eight Herbivorous Coral Reef Fishes From the Xisha Islands, China, as Determined by Microscopy, 18S rRNA High-throughput Sequencing and Stable Isotope Analyses

Wu¹,

Wang²,

Liu³

et al. 2021

Preprint

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Herbivorous fishes play an important role in controlling the overabundance of macroalgae on coral reefs. Understanding the feeding selectivity and consumption of macroalgae by herbivorous fishes can be challenging in studies of their ecological role in the preservation and recovery of coral reefs. Coral reef decline, macroalgal overgrowth and overfishing are clearly visible in the Xisha Islands, China. However, there have been no studies of the feeding behaviors of herbivorous fishes in this area. We used microscopy, 18S rRNA high-throughput sequencing and stable isotope analyses to comprehensively examine the dietary spectrum of eight herbivorous reef fish species common in the Xisha Islands, including one parrotfish, two chub, two unicorn fish and three rabbitfish. Multi-technique analyses of intestinal contents revealed that Kyphosus vaigiensis, Naso unicornis and Siganus argenteus showed a high consumption potential of macroalgae, suggesting that they are the key browsers which should receive priority protection in in the Xisha Islands. Kyphosus cinerascens, K. vaigiensis, N. unicornis and S. punctatissimus fed on the entire macroalgal thallus, indicating their greater ecological importance compared with species which only consume the algal fronds. However, Calotomus carolinus can consume the red alga Pneophyllum conicum, which is widely distributed on Indo-Pacific coral reefs and can overgrow and kill live corals. Clearly, a diverse herbivorous fish fauna is very important in the Xisha coral reefs. These results not only demonstrated the various functions of different herbivorous fish species in macroalgal removal, but also provided insights into the management of herbivorous fishes on the coral reefs of the South China Sea.

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Section: Discussionmentioning

confidence: 60%

Characteristics of Macroalgal Consumption by Eight Herbivorous Coral Reef Fishes From the Xisha Islands, China, as Determined by Microscopy, 18S rRNA High-throughput Sequencing and Stable Isotope Analyses

Wu¹,

Wang²,

Liu³

et al. 2021

Preprint

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“…The δ 13 C values of appendicularians are lower than those of copepods. The δ 13 C values of Scomber spp., M. asperum, and S. gracilis were lower than those of E. japonicus and T. japonicus, which feed exclusively on copepods (Kume et al, 2021). This suggests that appendicularians are an important food source for Scomber spp., M. asperum, and S. gracilis, compared with E. japonicus and T. japonicus.…”

Section: Larval Feeding Habitsmentioning

confidence: 94%

“…did not differ from those of E. japonicus. However, the morphological and DNA metabarcoding analyses of the gut contents suggest that diet composition differs between these two species (Kume et al, 2021).…”

Section: Larval Feeding Habitsmentioning

confidence: 95%

“…Trophic Relationship With Dominant Small Pelagic and Mesopelagic Fish Larvae Isotopic analysis aids in determining fish diets, as prey can be distinguished isotopically (Minagawa and Wada, 1984). Kume et al (2021) showed that the larvae of M. asperum and S. gracilis fed substantially on appendicularians in the northern Satsunan area. The δ 13 C values of appendicularians are lower than those of copepods.…”

Section: Larval Feeding Habitsmentioning

confidence: 99%

“…Both the quality and quantity of prey are important for the growth of fish (Hjort, 1914). Therefore, the characterization of trophic ecology is essential for understanding the recruitment dynamics of fish (Hirai et al, 2017;Kume et al, 2021). The growth rate of fish is determined by multiple environmental factors, such as water temperature and prey availability (Heath, 1992;Takasuka et al, 2016), along with the key factors regulating the survival potential during the early life stages and the recruitment success of the fish (Shoji et al, 2005;Robert et al, 2007;Kamimura et al, 2015;Takasuka et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Distribution, Feeding Habits, and Growth of Chub Mackerel, Scomber japonicus, Larvae During a High-Stock Period in the Northern Satsunan Area, Southern Japan

et al. 2021

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To evaluate the importance of the northern Satsunan area in southern Japan as a spawning and nursery ground for chub mackerel (Scomber japonicus), we investigated the early life history characteristics (e.g., larval distribution, feeding habits, and growth) of S. japonicus over five successive years. This area is considered the main habitat and spawning ground of the congeneric species, S. australasicus. Using polymerase chain reaction-restriction fragment length polymorphism analysis, we first confirmed that S. japonicus larvae were abundant in the northern Satsunan area, potentially representing a major spawning and nursery ground in the Japanese Pacific coastal area. The number of recorded larvae started to increase in 2016, corresponding to the population dynamics of the Pacific stock of the species, which has shown increasing trends in recent years. Morphological and DNA metabarcoding analyses of gut contents and stable isotope analysis showed that, in addition to copepods, the larvae fed substantially on appendicularians. The trophic pathway involving appendicularians might support the feeding habits of S. japonicus, promoting its coexistence with other dominant species. Both the instantaneous growth rate and daily specific growth rate were comparable to those in the southern East China Sea, which is the main spawning and nursery ground of the species. Our data strongly suggest that the northern Satsunan area has favorable conditions for sustaining high larval population densities, even during phases with high population numbers. Our results provide insights for the fisheries management for S. japonicus in the Japanese Pacific coastal area, especially during high-stock periods.

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Method choice affects estimates of diet and niche breadth for small stream fish

Kuhrt,

Musetta-Lambert,

Power

et al. 2023

Hydrobiologia

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Diet niche segregation of co-occurring larval stages of mesopelagic and commercially important fishes in the Osumi Strait assessed through morphological, DNA metabarcoding, and stable isotope analyses

Cited by 18 publications

References 60 publications

Characteristics of Macroalgal Consumption by Eight Herbivorous Coral Reef Fishes From the Xisha Islands, China, as Determined by Microscopy, 18S rRNA High-throughput Sequencing and Stable Isotope Analyses

Characteristics of Macroalgal Consumption by Eight Herbivorous Coral Reef Fishes From the Xisha Islands, China, as Determined by Microscopy, 18S rRNA High-throughput Sequencing and Stable Isotope Analyses

Distribution, Feeding Habits, and Growth of Chub Mackerel, Scomber japonicus, Larvae During a High-Stock Period in the Northern Satsunan Area, Southern Japan

Method choice affects estimates of diet and niche breadth for small stream fish

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