Spatial and temporal variations in stable isotope values (δ13C and δ15N) of the primary and secondary consumers along the southern coastline of the Caspian Sea

Naddafi, Rahmat; Koupayeh, Nazila Hajizadeh; Ghorbani, Rasoul

doi:10.1016/j.marpolbul.2021.112001

Cited by 8 publications

(3 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As essential elements for the growth of life, carbon, and nitrogen play an important role in ecosystems. Related studies have shown that carbon and nitrogen can reflect the construction of aquatic food chains and the division of trophic levels in aquatic ecosystems [6] and can also be used for carbon and nitrogen isotope analysis in aquatic plants and plankton [7,8]. Water bodies in karst areas are generally rich in calcium and somewhat alkaline.…”

Section: Introductionmentioning

confidence: 99%

Study on the Carbon and Nitrogen Isotope Characteristics and Sources and Their Influence on Carbon Sinks in Karst Reservoirs

Zhou

Kong

Zhang

et al. 2023

Land

View full text Add to dashboard Cite

The hydrochemical analysis method was used to reveal the sources and spatiotemporal variations of carbon and nitrogen elements in the Pingzhai Reservoir, and the C–N coupling cycle and its influence on the karst carbon sink are discussed. The results show the following: (1) The hydrochemical type of the study area is HCO3-Ca. (2) From the river to the reservoir and then to the reservoir outlet, the values of HCO3− and δ13CDIC showed an opposite trend. The values of NO3−, δ15N-NO3−, and δ18O-NO3− were different in each stage of the river. (3) HCO3− mainly comes from the weathering of carbonate rocks and the oxidative decomposition of organic matter. Nitrate mainly comes from chemical fertilizers, soil organic nitrogen, sewage, and livestock manure. (4) The average proportion of HCO3− produced by HNO3 dissolving carbonate rock is 8.38%, but this part does not constitute a carbon sink. Compared with rivers, the proportion of HCO3− and (Ca2+ + Mg2+) produced by HNO3 dissolving carbonate rock in reservoir water is relatively large. The input of nitrate not only pollutes the water body with NO3− but also changes the carbon source/sink pattern of the water–rock interaction.

show abstract

Section: Introductionmentioning

confidence: 99%

Study on the Carbon and Nitrogen Isotope Characteristics and Sources and Their Influence on Carbon Sinks in Karst Reservoirs

Zhou

Kong

Zhang

et al. 2023

Land

View full text Add to dashboard Cite

show abstract

“…The southern part of the Caspian Sea (bordering with Iran) is increasingly exposed to human caused pollution due to high percentage of organic matter entering the basin via agricultural and aquaculture effluents 29 . Additionally, WHO report on surveillance of antibiotic consumption puts Iran among countries with high-level use of antibiotics 30 which possibly would further leak into aquatic ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Genome-resolved insight into the reservoir of antibiotic resistance genes in aquatic microbial community

Goodarzi

Asad

Mehrshad

2022

Sci Rep

View full text Add to dashboard Cite

Aquatic microbial communities are an important reservoir of antibiotic resistance genes (ARGs). However, distribution and diversity of different ARG categories in environmental microbes with different ecological strategies is not yet well studied. Despite the potential exposure of the southern part of the Caspian Sea to the release of antibiotics, little is known about its natural resistome profile. We used a combination of Hidden Markov model (HMM), homology alignment and a deep learning approach for comprehensive screening of the diversity and distribution of ARGs in the Caspian Sea metagenomes at genome resolution. Detected ARGs were classified into five antibiotic resistance categories including prevention of access to target (44%), modification/protection of targets (30%), direct modification of antibiotics (22%), stress resistance (3%), and metal resistance (1%). The 102 detected ARG containing metagenome-assembled genomes of the Caspian Sea were dominated by representatives of Acidimicrobiia, Gammaproteobacteria, and Actinobacteria classes. Comparative analysis revealed that the highly abundant, oligotrophic, and genome streamlined representatives of taxa Acidimicrobiia and Actinobacteria modify the antibiotic target via mutation to develop antibiotic resistance rather than carrying extra resistance genes. Our results help with understanding how the encoded resistance categories of each genome are aligned with its ecological strategies.

show abstract

“…The southern part of the Caspian Sea is increasingly exposed to human pollutions. There is a high percentage of organic matter entering the basin via agricultural and aquaculture effluents (20). The status of antibiotic pollution of the Caspian Sea has not been assessed, however as the WHO report on surveillance of antibiotic consumption puts Iran among countries with high-level use of antibiotics (21), monitoring the ARG reservoir of the Caspian sea seems critical.…”

Section: Introductionmentioning

confidence: 99%

Genome-resolved insight into the reservoir of antibiotic resistance genes in an aquatic microbial community

Goodarzi

Asad

Mehrshad

2022

Preprint

View full text Add to dashboard Cite

Aquatic microbial communities are an important reservoir of Antibiotic Resistance Genes. However, distribution and diversity of different ARG categories in environmental microbes with different ecological strategies is not yet well studied. Despite the potential exposure of the southern part of the Caspian Sea to the release of antibiotics, little is known about its natural resistome profile. We used a combination of Hidden Markov model (HMM), homology alignment and a deep learning approach for comprehensive screening of the diversity and distribution of ARGs in the Caspian Sea metagenomes at a genome resolution. Detected ARGs were classified into five antibiotic resistance categories including Prevention of access to target (44%), Modification/protection of targets (30%), Direct modification of antibiotics (22%), Stress resistance (3%), and Metal resistance (1%). The 102 detected ARG containing metagenome-assembled genomes of the Caspian Sea were dominated by representatives of Acidimicrobiia, Gammaproteobacteria and Actinobacteria classes. Comparative analysis revealed that the highly abundant, oligotrophic, and genome streamlined representatives of taxa Acidimicrobiia and Actinobacteria modify the antibiotics target via mutation to develop antibiotic resistance rather than carrying extra resistance genes. Our results help with understanding how the encoded resistance categories of each genome are aligned with their ecological strategies.

show abstract

Spatial and temporal variations in stable isotope values (δ13C and δ15N) of the primary and secondary consumers along the southern coastline of the Caspian Sea

Cited by 8 publications

References 50 publications

Study on the Carbon and Nitrogen Isotope Characteristics and Sources and Their Influence on Carbon Sinks in Karst Reservoirs

Study on the Carbon and Nitrogen Isotope Characteristics and Sources and Their Influence on Carbon Sinks in Karst Reservoirs

Genome-resolved insight into the reservoir of antibiotic resistance genes in aquatic microbial community

Genome-resolved insight into the reservoir of antibiotic resistance genes in an aquatic microbial community

Contact Info

Product

Resources

About