Food habits of bluegill<i>Lepomis macrochirus</i>populations in reservoirs in Kagawa, Japan

Yokogawa, Koji

doi:10.1080/21658005.2018.1474309

Cited by 2 publications

(2 citation statements)

References 87 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of empirical studies showed that L. macrochirus consumes more zooplankton or invertebrates than fish, in contrast to the feeding tendency of M. salmoides [55,56]. Choi and Kim [28] also suggested that M. salmoides consumes young fish, including L. macrochirus, whereas L. macrochirus prefers zooplankton and invertebrates.…”

Section: Effect Of the Cladoceran Community On The Settlement Of Exotic Fishmentioning

confidence: 99%

Effect of the Human Utilization of Northern Snakehead (Channa argus Cantor, 1842) on the Settlement of Exotic Fish and Cladoceran Community Structure

Choi

Kim

2021

Sustainability

View full text Add to dashboard Cite

Empirical studies suggest that changes in the density of top predators, such as carnivorous fish, in freshwater food webs, strongly affect not only fish communities but also various primary and secondary consumers. Based on these findings, we explored how differences in the utilization of carnivorous fish (i.e., Northern Snakehead, Channa argus) by humans affected the fish and cladoceran community structure as well as the settlement of exotic fish species (i.e., Lepomis macrochirus and Micropterus salmoides) in 30 wetlands located in the upper and lower reaches of the Nakdong River. Our results show that in the mid–lower reaches of the Nakdong River, the density of C. argus was low, while high densities of L. macrochirus and M. salmoides were observed. Exotic fish species are frequently consumed by C. argus, leading to a low density of L. macrochirus and M. salmoides in the upper reaches, which supported a high density of C. argus. However, in the mid–lower reaches, the density of L. macrochirus was high because of the frequent collection of C. argus by fishing activities. The dominance of L. macrochirus significantly changed the structure of cladoceran communities. L. macrochirus mainly feeds on pelagic species, increasing the density of epiphytic species in the mid–lower reaches. The continued utilization of C. argus by humans induced a stable settlement of exotic fish species and strongly affected the community structures of primary consumers in the 30 wetlands. The frequency of C. argus collection has to be reduced to secure biodiversity in the mid–lower reaches of the Nakdong River, which will reduce the proportion of exotic fish species and increase the conservation of native fish.

show abstract

Section: Effect Of the Cladoceran Community On The Settlement Of Exotic Fishmentioning

confidence: 99%

Effect of the Human Utilization of Northern Snakehead (Channa argus Cantor, 1842) on the Settlement of Exotic Fish and Cladoceran Community Structure

Choi

Kim

2021

Sustainability

View full text Add to dashboard Cite

show abstract

“…L. macrochirus is a highly predatory fish with a wide feeding niche, ranging from zooplankton to small vertebrates, with its feeding plasticity depending on its growth stage and the habitat it occupies [33,34]. Diverse studies related to the dietary resources of L. macrochirus have been conducted, because its broad dietary spectrum poses a severe threat to ecosystems [14,[35][36][37]. However, most of these studies have focused on investigating the major dietary resources for L. macrochirus using a single analytical method, either SCA or SIA.…”

Section: Introductionmentioning

confidence: 99%

Insights into Ontogenetic Niche Changes in Bluegill, Lepomis macrochirus, Applying Combined Analyses of Stomach Content and Stable Isotopes

Kwak,

Kim,

et al. 2023

Water

View full text Add to dashboard Cite

We integrated stomach content analysis (SCA) and stable isotope analysis (SIA) to understand ontogenetic niche shifts in the invasive freshwater fish, bluegill, Lepomis macrochirus, inhabiting the Yedang Reservoir in Korea. Based on the total length (TL), we classified L. macrochirus as small (23–57 mm), medium (61–99 mm), or large (100–163 mm). Across all study sites, the index of relative importance (IRI) of zooplankton was high for small individuals, whereas those of benthic macroinvertebrates were high for the medium and large groups. Isotopic niche width estimates based on carbon and nitrogen isotope ratios (δ space) also increased with growth, indicating an ontogenetic niche shift in L. macrochirus. In particular, the δ space and diet plasticity of large fish was higher in the littoral population, implying L. macrochirus are generalist feeders as adults. Individuals classified as small showed confined and constant δ space, regardless of habitat condition. Thus, together with the results on the significantly high IRI of zooplankton, these individuals seem to have strong specialistic feeding ecology. Our study demonstrates the applicability strength of combining SCA and SIA for ecological niche research by providing clear evidence of an ontogenetic niche shift in L. macrochirus and elucidates their feeding ecology.

show abstract

Food habits of bluegillLepomis macrochiruspopulations in reservoirs in Kagawa, Japan

Cited by 2 publications

References 87 publications

Effect of the Human Utilization of Northern Snakehead (Channa argus Cantor, 1842) on the Settlement of Exotic Fish and Cladoceran Community Structure

Effect of the Human Utilization of Northern Snakehead (Channa argus Cantor, 1842) on the Settlement of Exotic Fish and Cladoceran Community Structure

Insights into Ontogenetic Niche Changes in Bluegill, Lepomis macrochirus, Applying Combined Analyses of Stomach Content and Stable Isotopes

Contact Info

Product

Resources

About