Relationship between fish community diversity and environmental factors in the Lianjiang River, Guangdong, China

The excessive use of antibiotics speeds up the dissemination and aggregation of antibiotic resistance genes (ARGs) in the environment. The ARGs have been regarded as a contaminant of serious environmental threats on a global scale. The constant increase in aquaculture production has led to extensive use of antibiotics as a means to prevent and treat bacterial infections; there is a universal concern about the environmental risk of ARGs in the aquaculture environment. In this study, a survey was conducted to evaluate the abundance and distributions of 10 ARGs, bacterial community, and environmental factors in sediment samples from aquatic farms distributed in Anhui (AP1, AP2, and AP3), Fujian (FP1, FP2, and FP3), Guangxi (GP1, GP2, and GP3), Hainan (HP1, HP2, and HP3), and Shaanxi (SP1, SP2, and SP3) Province in China. The results showed that the relative abundance of total ARGs was higher in AP1, AP2, AP3, FP3, GP3, HP1, HP2, and HP3 than that in FP1, FP2, GP1, GP2, SP1, SP2, and SP3. The sul1 and tetW genes of all sediment samples had the highest abundance. The class 1 integron (intl1) was detected in all samples, and the result of Pearson correlation analysis showed that the intl1 has a positive correlation with the sul1, sul2, sul3, blaOXA, qnrS, tetM, tetQ, and tetW genes. Correlation analysis of the bacterial community diversity and environmental factors showed that the Ca2+ concentration has a negative correlation with richness and diversity of the bacterial community in these samples. Of the identified bacterial community, Proteobacteria, Firmicutes, Chloroflexi, and Bacteroidota were the predominant phyla in these samples. Redundancy analysis showed that environmental factors (TN, TP, Cl–, and Ca2+) have a positive correlation with the bacterial community (AP1, GP1, GP2, GP3, SP1, SP2, and SP3), and the abundance of ARGs (sul1, tetW, qnrS, and intl1) has a positive correlation with the bacterial community (AP2, AP3, HP1, HP2, and HP3). Based on the network analysis, the ARGs (sul1, sul2, blaCMY, blaOXA, qnrS, tetW, tetQ, tetM, and intl1) were found to co-occur with bacterial taxa from the phyla Chloroflexi, Euryarchaeota, Firmicutes, Halobacterota, and Proteobacteria. In conclusion, this study provides an important reference for understanding the environmental risk associated with aquaculture activities in China.

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Composition of the ichthyofauna in Brazilian semiarid reservoirs

Biota Neotropica ◽

10.1590/1676-0611-bn-2017-0334 ◽

2017 ◽

Vol 17 (3) ◽

Cited By ~ 1

Author(s):

Silvia Yasmin Lustosa Costa ◽

José Etham de Lucena Barbosa ◽

Leandro Gomes Viana ◽

Telton Pedro Anselmo Ramos

Keyword(s):

Endangered Species ◽

Arid Region ◽

Fish Community ◽

Aquatic Invertebrates ◽

Fish Fauna ◽

Community Diversity ◽

Drainage Basins ◽

Brazilian Semiarid ◽

Semi Arid Region ◽

Semi Arid

Abstract The scale of impact that the São Francisco River transposition project will have on the drainage basins ichthyofauna is still unclear, however, changes in the fish community diversity and abundance is probable. Surveys and registries of the fish fauna within key systems of the catchment basins are priority actions for the conservation of the aquatic diversity. This study conducted a taxonomic survey of the Epitácio Pessoa (Boqueirão municipality) and Argemiro de Figueiredo (Itatuba municipality), reservoirs ichthyofauna, both belonging to the Paraíba do Norte River basin, important socioeconomic and environmental systems for the transposition project. Monthly sampling was carried out between October/2014 to September/2015 in the upstream and downstream zones of the reservoirs. The specimens were collected using dip nets, drag nets, and sieves, and placed on ice in the field. Later in the laboratory, they were transferred to 10% formaldehyde and then preserved in 70% alcohol. A total of 2,328 specimens were collected representing five orders, 14 families, and 31 species in both systems. At the upstream zones 2057 specimens were collected representing 17 species, and at the downstream zones 271 specimens were collected representing 24 species. Of the 31 species recorded, 13 species are endemic to watersheds that drain rivers from the Brazilian semi-arid region, and seven species (Apareiodon davisi, Characidium bimaculatum, Hypostomus pusarum, Parotocinclus jumbo, P. spilosoma, Pimelodella enochi, and Prochilodus brevis) are endemic to the Mid-Northeastern Caatinga Ecoregion (MNCE). Among the latter, Parotocinclus spilosoma and Pimelodella enochi are endemic to the Paraíba do Norte River. Apareiodon davisi is classified as Endangered according to the current published Brazil’s official list of endangered species of fish and aquatic invertebrates. This pre-transposition ichthyofaunistic survey will serve as a basis for future post-transposition analyzes, considering this action will change the scope of the ecosystems diversity.

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Long-term impacts of invasive round goby Neogobius melanostomus on fish community diversity and diets in the St. Clair River, Michigan

Journal of Great Lakes Research ◽

10.1016/j.jglr.2015.05.004 ◽

2015 ◽

Vol 41 (3) ◽

pp. 862-872 ◽

Cited By ~ 10

Author(s):

Erin M. Burkett ◽

David J. Jude

Keyword(s):

Fish Community ◽

Round Goby ◽

Neogobius Melanostomus ◽

Community Diversity

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Using eDNA Metabarcoding to Monitor Changes in Fish Community Composition After Barrier Removal

Frontiers in Ecology and Evolution ◽

10.3389/fevo.2021.629217 ◽

2021 ◽

Vol 9 ◽

Author(s):

Teja P. Muha ◽

Deiene Rodriguez-Barreto ◽

Richard O'Rorke ◽

Carlos Garcia de Leaniz ◽

Sofia Consuegra

Keyword(s):

Community Composition ◽

Fish Community ◽

Anguilla Anguilla ◽

Environmental Dna ◽

Life Cycles ◽

Population Connectivity ◽

Community Diversity ◽

Additional Species ◽

Fish Community Composition ◽

Barrier Removal

Artificial instream barriers are a major cause of habitat fragmentation that reduce population connectivity and gene flow by limiting fish movements. To mitigate their impacts, obsolete barriers are increasingly been removed worldwide, but few barrier removal projects are monitored. We employed a powerful Before-After-Downstream-Upstream (BADU) approach using environmental DNA (eDNA) metabarcoding to examine the effects on fish community composition of removing a weir in the river Lugg (England) that had been suggested to have a detrimental effect on salmonid migration. We found no change in fish community diversity or relative abundance after the removal above or below the weir, but detected an important effect of sampling season, likely related to the species' life cycles. eDNA detected nine fish species that were also identified by electrofishing sampling and one additional species (Anguilla anguilla) that was missed by traditional surveys. Our results suggest that monitoring of barrier removal projects should be carried out to ensure that any ecological benefits are properly documented and that eDNA metabarcoding is a sensitive technique to monitor the effects of barrier removal.

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Species richness and identity both determine the biomass of global reef fish communities

Nature Communications ◽

10.1038/s41467-021-27212-9 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jonathan S. Lefcheck ◽

Graham J. Edgar ◽

Rick D. Stuart-Smith ◽

Amanda E. Bates ◽

Conor Waldock ◽

...

Keyword(s):

Species Richness ◽

Environmental Factors ◽

Reef Fish ◽

Ecosystem Functioning ◽

Fish Community ◽

Ecosystem Functions ◽

Rocky Reef ◽

Community Biomass ◽

Number Of Species ◽

Declining Species

AbstractChanging biodiversity alters ecosystem functioning in nature, but the degree to which this relationship depends on the taxonomic identities rather than the number of species remains untested at broad scales. Here, we partition the effects of declining species richness and changing community composition on fish community biomass across >3000 coral and rocky reef sites globally. We find that high biodiversity is 5.7x more important in maximizing biomass than the remaining influence of other ecological and environmental factors. Differences in fish community biomass across space are equally driven by both reductions in the total number of species and the disproportionate loss of larger-than-average species, which is exacerbated at sites impacted by humans. Our results confirm that sustaining biomass and associated ecosystem functions requires protecting diversity, most importantly of multiple large-bodied species in areas subject to strong human influences.

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