Eels as natural samplers highlight spatial heterogeneity in energy flow in an estuary

Nishimoto A.; Iida M.; Yokouchi K.Yamamoto T.Fukuda N.

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Eels as natural samplers highlight spatial heterogeneity in energy flow in an estuary

机译：Eels as natural samplers highlight spatial heterogeneity in energy flow in an estuary

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? 2023 Elsevier LtdThe high spatiotemporal heterogeneity makes it difficult to ensure the representation of samples in estuarine studies. Using Japanese eels as natural samplers (n = 881), we revealed the spatial heterogeneity of energy flow among three successive estuarine segments (upper, middle, and lower estuaries) of the Hamana Lake?Miyakoda River system on the Pacific side of central Honshu, Japan. In the upper estuary which serves as the nursery ground for eels, the predominant small eels (body weight 150 g) fed directly on terrestrial subsidies in the form of fallen insects (49.0 IRI) and earthworms (20.2 IRI), indicating that the detritus food chain does not directly affect the diet of large eels. Terrestrial subsidies in the form of living organisms do not contribute to the diet of eels in the adjacent middle estuary, which is the main growth habitat for eels within an estuary. However, small eels depend on terrestrial subsidies by feeding on oysters (71.6 IRI), which assimilate terrestrial particulate organic matter. The predominant medium eels were highly dependent on the high diversity and biomass of prey groups, as indicated by the high IRI values of several groups, such as infaunal bivalves (31.7 IRI), oysters (19.0 IRI), amphipods (22.6 IRI), and polychaetes (16.4 IRI). Eelgrass beds usually serve as shelters and foraging areas for medium and large eels in the lower estuary. Despite the high species diversity around seagrass meadows, the eels concentrated on infaunal bivalves (85.4 IRI) with high biomass, predominantly Anadara sp. In addition to being tools for monitoring fauna, eels as natural samplers provide insights into the energy flow in ecosystems.

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《Estuarine coastal and shelf science》 |2023年第5期|1.1-1.9|共9页
作者
Nishimoto A.; Iida M.; Yokouchi K.Yamamoto T.Fukuda N.;
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作者单位

Yokohama Field Station Fisheries Technology Institute Japan Fisheries Research and Education Agency||Fisheries Technology Institute Japan Fisheries Research and Education Agency;

Hamanako Branch Shizuoka Prefectural Research Institute of Fishery and Ocean;

Yokohama Field Station Fisheries Resources Institute Japan Fisheries Research and Education AgencyNikko Field Station Fisheries Technology Institute Japan Fisheries Research and Education Agency;

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正文语种英语
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Allochthonous input; Euryhaline species; Japanese eel; Stomach content analysis; Terrestrial subsidies;

Eels as natural samplers highlight spatial heterogeneity in energy flow in an estuary

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