Characteristics of Fish Fauna in the Lower Geum River and Identification of Trophic Guilds using Stable Isotopes Analysis

Yoon, Ju-Duk; Chang, Kwang‐Hyeon; Choi, Jong-Yun; Joo, Gea‐Jae; Nam, Gui-Sook; Yoon, Johee; Jang, Min‐Ho

doi:10.11626/kjeb.2015.33.1.034

Cited by 9 publications

(5 citation statements)

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“…There remains a controversy about classifying consumers into the specific trophic group since the same consumer may have different dietary characteristics in different geographical environments. However, a discriminant function analysis (DFA) has been successfully conducted to classify samples into groups (Jepsen and Winemiller, 2002;Burress et al, 2013;Yoon et al, 2015). δ 13 C and δ 15 N values were used as variables to examine whether samples could be classified into predefined trophic groups.…”

Section: Discussionmentioning

confidence: 99%

Carbon Transfer Processes of Food Web and Trophic Pathways in a Tropical Eutrophic Seagrass Meadow

et al. 2021

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Seagrass meadows provide important habitats and rich organic carbon sources for consumers at different trophic levels but are threatened by accelerating eutrophication in coastal waters. Nevertheless, at present, carbon transfer processes throughout the food web and trophic pathways in eutrophic seagrass meadows are still poorly known. To resolve this issue, carbon sources of different trophic communities in a eutrophic tropical seagrass meadow [Xincun (XC) bay, South China Sea] under eutrophication were examined in summer and winter using dual stable isotopes. The δ13C value of omnivores and carnivores overlapped more with that of herbivores and planktivores/filter feeders, which mainly overlapped with that of epiphytes in summer and macroalgae in winter. Meanwhile, epiphytes and macroalgae exhibited high biomass and corresponding highest contribution to herbivores, omnivores, and carnivores in summer and winter, respectively. These results suggest that the grazing food chain was the main trophic pathway in this eutrophic seagrass meadow, and that the transfer of carbon flow in the grazing food chain was mainly dominated by the proliferating epiphytes or macroalgae carbon. In contrast, the contribution of seagrass to detritivores in both seasons was higher than that of other food sources. Our findings suggest that in eutrophic tropical seagrass meadows, the proliferation of epiphytes or macroalgae induced by high nutrient loading, as well as their seasonal changes, has a greater impact on the transfer of carbon in the grazing food chain than that in the detritus food chain, and the seagrass fueled the food web mainly through the detritus food chain.

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Section: Discussionmentioning

confidence: 99%

Carbon Transfer Processes of Food Web and Trophic Pathways in a Tropical Eutrophic Seagrass Meadow

et al. 2021

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“…The predatory carp E. erythropterus is also known to feed on benthic invertebrates and juvenile fish. They also pursue and select prey near the water surface [42]. The wide horizontal range of predatory E. erythropterus's ENS at downstream but narrower ENS at upstream of the weirs may indicate that its niche is specified by selecting various prey items at the same trophic level, avoiding overlap with largemouth bass in the downstream area of the weirs, which is a more lotic environment but their niches overlap in upstream locations.…”

Section: Discussionmentioning

confidence: 99%

Ecological Niche Space of Fish Communities in Impounded Sections of Large Rivers: Its Application to Assessment of the Impact of Weirs on River Ecosystems

Hur¹,

Jang

Shin

et al. 2018

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To estimate the impact of weirs on large river fish communities, we applied the ecological niche space (ENS) measured quantitatively using carbon and nitrogen stable isotope ratios to the monitoring of effects of weirs constructed on four major rivers in Korea. ENS was calculated using the Bayesian stable isotope in R statistics. The ENS of fish communities showed persistent differences between upstream and downstream areas of all studied weirs. The ENSs of omnivores were larger in upstream impounded areas but the ENSs of predator species, both endemic (Erythroculter erythropterus) and exotic (Micropterus salmoides) predators had decreased ENSs in upstream areas. E. erythropterus showed horizontal variations in a wide range of carbon stable isotopes, whereas M. salmoides showed vertical variations in nitrogen stable isotopes. The results suggest that weir construction may have species-specific impact on the ENS of fish community by impoundment and increase niche overlap in upstream areas of the weir. The measured ENS of fish community was significantly correlated with the relative abundance of tolerant species negatively, whereas correlated with that of endemic species positively, suggesting that the ENS can be used as a comprehensive indicator of habitat conditions.

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“…Light and dark gray represent South and North Korea, respectively. Circles represent the sampling sites of potential diets: FF: freshwater fish [ 49 , 50 ], FI: freshwater invertebrates [ 51 , 52 ], MF: marine fish [ 53 ], MS: marine shrimp [ 54 ], and MC: marine crustacean [ 55 ]. The base map was creasted using Natural Earth.…”

Section: Methodsmentioning

confidence: 99%

Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks

et al. 2021

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The endangered Black-faced Spoonbill (Platalea minor) strictly breeds in marine environments and is threatened by the rapid loss of coastal wetlands within its breeding range. Adults with chicks are thought to gradually switch feeding sites from freshwater wetlands to coastal mudflats as the chicks’ osmoregulatory system develops. We investigated age-dependent shifts in the diet of Black-faced Spoonbill chicks at four breeding colonies with varying freshwater habitat availability by examining stable isotopes (δ13C, δ15N) between the tip (grown at the age of 10 days) and middle (grown at the age of 22 days) portions of their primary feathers. The δ13C value of the middle portions was significantly higher than that of the tips, which suggested that the ratio of marine resources increased with the growth and development of chicks. A Bayesian isotope mixing model revealed that the diet proportion of marine prey in the early-chick rearing season was slightly higher than in the late-chick rearing season at three colonies in inshore areas, although this proportion was approximately 60% even in the early chick-rearing period. In contrast, isotopic values and reconstructed diet composition suggested that chicks in an offshore colony with limited freshwater wetlands relied more heavily on freshwater diets for both chick-rearing periods (>80%). Our results suggest that the shifts in feeding sites seen in previous studies might be related to the age-dependent dietary shift of chicks, highlighting the importance of freshwater wetlands for spoonbills on offshore islands without an inflow of freshwater in nearby intertidal mudflats. These findings emphasize the importance of freshwater prey and wetlands even for the endangered marine-breeding spoonbills, even though the negative impact of salt stress remains inconclusive.

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Characteristics of Fish Fauna in the Lower Geum River and Identification of Trophic Guilds using Stable Isotopes Analysis

Cited by 9 publications

References 0 publications

Carbon Transfer Processes of Food Web and Trophic Pathways in a Tropical Eutrophic Seagrass Meadow

Carbon Transfer Processes of Food Web and Trophic Pathways in a Tropical Eutrophic Seagrass Meadow

Ecological Niche Space of Fish Communities in Impounded Sections of Large Rivers: Its Application to Assessment of the Impact of Weirs on River Ecosystems

Age-dependent shifts and spatial variation in the diet of endangered Black-faced Spoonbill (Platalea minor) chicks

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