Baolong Wang’s research while affiliated with Dalian Ocean University and other places

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Publications (6)


The survival rate and behavior of Limnodrilus hoffmeisteri after different treatments. (a) The survival rate of L. hoffmeisteri; (b) Proportion of the migratory numbers of L. hoffmeisteri; (c) Swing frequency of migratory L. hoffmeisteri; (d) Swing frequency of nucleus populations L. hoffmeisteri; (e) Successful food acquisition rate of L. hoffmeisteri at D7; (f) Successful food acquisition rate of L. hoffmeisteri at D14; (g) Aggregation rate of L. hoffmeisteri at D7; (h) Aggregation rate of L. hoffmeisteri at D14. BA: B. aeruginosa; NS: None snails; PC: P. canaliculata. Different superscript letters indicate significant difference between groups (p < 0.05).
Enzymatic activity and lipid peroxidation of L. hoffmeisteri after different treatments. (a) SOD; (b) CAT; (c) GSH; (d) MDA.
The composition of intestinal symbiotic bacteria of L. hoffmeisteri under different treatments. (a) phylum level; (b) genus level.
The survival rate and behavior of L. hoffmeisteri after different treatments (AFPC, As or IPC). (a) The survival rate of L. hoffmeisteri; (b) Proportion of the migratory numbers of L. hoffmeisteri; (c) Swing frequency of migratory L. hoffmeisteri; (d) Swing frequency of nucleus populations L. hoffmeisteri; (e) Successful food acquisition rate of L. hoffmeisteri at D7; (f) Successful food acquisition rate of L. hoffmeisteri at D14; (g) Aggregation rate of L. hoffmeisteri at D7; (h) Aggregation rate of L. hoffmeisteri at D14. Different superscript letters indicate significant difference between groups (p < 0.05).
The oxidation and antioxidant responses of L. hoffmeisteri after different treatments. (a) SOD; (b) CAT; (c) GSH; (d) MDA.

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Effect of Pomacea canaliculata on Limnodrilus hoffmeisteri: Behavior, Oxidative Stress, and Microbiota Alterations
  • Article
  • Full-text available

November 2024

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12 Reads

Mingyuan Liu

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Changrun Sui

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Baolong Wang

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[...]

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Ying Liu

Pomacea canaliculata is an invasive species which has significantly impacted native ecosystems globally. The benthic worm Limnodrilus hoffmeisteri is essential for the stability of the native aquatic ecosystem, facilitating the nutrient cycle dynamics through bioturbation. Nevertheless, limited information exists regarding the impact of P. canaliculata on those key native benthic species. Present study evaluated the impacts of P. canaliculata on L. hoffmeisteri by exposing L. hoffmeisteri to P. canaliculata (PC group) and the native snail Bellamya aeruginosa (BA group), with a control group consisting of no snails (NS group). The survival rate of L. hoffmeisteri in the PC group persisted diminished over 14 days, with notable declines in the rates of successful food acquisition and aggregation, an increase in migration, and a decrease in swing frequency. Elevated oxidative stress levels were linked to these alterations in L. hoffmeisteri behavior. Additionally, the presence of P. canaliculata increased the abundance of intestinal pathogenic bacteria in L. hoffmeisteri, with Aeromonas being one of the most lethal. Experimental models of Aeromonas‐free P. canaliculata (AFPC), re‐infected AFPC (IPC), and Aeromonas (As) were established to illustrate the role of Aeromonas in the decline of L. hoffmeisteri. Similar patterns in L. hoffmeisteri survival, behavior, and oxidative stress were observed in As, IPC, and PC group; however, these effects were mitigated by the elimination of Aeromonas in the AFPC group. Furthermore, L. hoffmeisteri was fatally affected by the four Aeromonas strains that were obtained from P. canaliculata intestine. These findings indicate that P. canaliculata exerts a deleterious impact on L. hoffmeisteri, and Aeromonas colonizing in intestine plays an important role. This study reveals a novel invasion mechanism of P. canaliculata.

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Responses of survival, antioxidant system and intestinal microbiota of native snail Bellamya purificata to the invasive snail Pomacea canaliculata

September 2024

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33 Reads

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1 Citation

Pomacea canaliculata is one of the most successful invader in worldwide, adversely affecting native ecosystem through direct predation or indirect competition, while the mechanism of indirect effects on native species remain poorly understood. To clarify the effects of P. canaliculata on the native near-niche species, Bellamya purificata, a widespread freshwater gastropod in China, was selected as the research subject. The changes of mortality, histology, antioxidant system as well as the intestinal flora diversity of B. purificata were explored in present study. The results showed that the median lethal dose of P. canaliculata culture solution for B. purificata was 23.76 ind/L and a concentration-dependent damage of both the gonad and hepatopancreas were observed, the gonadal villi were dissolved and the hepatopancreas cells were broken at 20 ind/L. Furthermore, different concentrations of P. canaliculata culture solution leading to the antioxidant damage on the enzyme or non-enzyme systems of B. purificata at various degrees. Additionally, a decrease in the diversity of the intestinal flora was observed, accompanied by an increase in the abundance of pathogenic bacteria such as Pseudomonas and Aeromonas after the exposure of the culture solution of P. canaliculata. Last, after being recovered in freshwater for 24 h, the antioxidant damage of B. purificata and the disturbance of intestinal flora diversity were still not recovered especially in the high concentration group. The indirect competitive mechanism of P. canaliculata culture solution on B. purificata were explored from the aspects of tissue, biochemical level and intestinal flora, which enriched the research of P. canaliculata invasion on native snails in China, and provided new insights for the study of the invasion strategy of P. canaliculata.


The behavior responses of Limnodrilus hoffmeisteri after exposure to secretion solutions (a) migratory proportion of L. hoffmeisteri, (b) aggregation rate of L. hoffmeisteri. N = 9.
Antioxidant enzymatic activity and lipid peroxidation of Limnodrilus hoffmeisteri and Propsilocerus akamusi after exposure to secretion solutions. (a–d) represent the activities of SOD, CAT, GSH, and MDA for L. hoffmeisteri, (A–D) represent the activities of SOD, CAT, GSH, and MDA for P. akamusi. N = 3. Different letters indicated significant differences between groups (p < .05).
The compositions of the intestinal microbiota of Limnodrilus hoffmeisteri and Propsilocerus akamusi under different treatments. (a) phylum level of L. hoffmeisteri, (b) genus level of L. hoffmeisteri, (c) ternary plots of genus of L. hoffmeisteri, (d) phylum level of P. akamusi, (e) genus level of P. akamusi, (f) ternary plots of genus of P. akamusi. N = 5.
Effects of short‐term exposure to Pomacea canaliculata secretions on Limnodrilus hoffmeisteri and Propsilocerus akamusi: A study based on behavior, intestinal microbiota, and antioxidant system

June 2024

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19 Reads

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1 Citation

Pomacea canaliculata is one of the most notorious invasive aquatic snail, capable of influencing various aquatic organisms through their secretions. Limnodrilus hoffmeisteri and Propsilocerus akamusi are the most prevalent and powerful bioturbators in aquatic ecosystems. However, the mechanism of P. canaliculata's secretions affecting bioturbators remains unknown. This study aimed to investigate the effects of P. canaliculata's secretion on L. hoffmeisteri and P. akamusi. L. hoffmeisteri and P. akamusi were treated for 24 h with P. canaliculata and the native species Bellamya aeruginosa secretions at different densities (1 or 20). The migration numbers and aggregation rate of L. hoffmeisteri indicated that P. canaliculata secretion caused L. hoffmeisteri to become alert and migrate away from the nucleus community, resulting in poor population identification, especially at high concentrations. Moreover, the antioxidant enzymatic activity, lipid peroxidation, intestinal microbial diversity, and composition of the two bioturbators were analyzed. Superoxide dismutase (SOD) activity and malondialdehyde (MDA) concentration were elevated following P. canaliculata secretion treatment, indicating oxidative damage. Furthermore, the composition and diversity of intestinal microbiota of L. hoffmeisteri and P. akamusi were changed. The abundance of functional microbiota decreased, and pathogenic bacteria such as Aeromonas became dominant in the intestines of both bioturbators. The current research evaluates the effects of P. canaliculata secretion on the behavior, oxidative stress, and intestinal microbial composition and diversity of two bioturbators, providing new insights into the assessment of post‐invaded ecosystems.


Study on the inactivation and reactivation mechanism of pathogenic bacteria in aquaculture by UVC-LED

May 2023

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165 Reads

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9 Citations

Ultraviolet disinfection is an important method for controlling the large-scale outbreaks of diseases in aquaculture. As a novel and promising light source, ultraviolet light-emitting diode (UV-LED) has the advantages of safety, high efficiency and no environmental pollution risks. However, it remains unclear whether UV-LEDs can replace traditional UV light sources for aquaculture water treatment processes. Present study aimed to investigate the efficacy of UVC-LEDs (265 nm) on pathogenic bacteria, specifically Aeromonas salmonicida and Escherichia coli. The effects of UVC-LED dose, light conditions, and temperature on bacterial reactivation were also investigated. The results showed that exposure to UVC-LED effectively inactivated both types of bacteria. To achieve 4.5-log inactivation of A. salmonicida and E. coli, 24 mJ/cm² and 28 mJ/cm² UVC-LED irradiation were required, and the inactivation rate increased with increasing UVC-LED fluence. Both A. salmonicida and E. coli were revived after UVC-LED disinfection, and photoreactivation was significantly higher than dark reactivation. Bacterial reactivation rate due to high-dose UVC-LED treatment was significantly lower than that of low-dose. After 72 h of reactivation, photoreactivation and dark reactivation rates were 1 ± 0.4% and 2.2 ± 0.2%for A. salmonicida, and 0.02% and 0% for E. coli, respectively. Besides, the photoreactivation rates for the two bacteria exhibited different correlations with temperature. The highest photoreactivation rate for A. salmonicida was 68.7 ± 4% at 20°C, while the highest photoreactivation rate for E. coli was 53.98 ± 2.9% at 15°C for 48 h. This study reveals the rapid and efficient inactivation of bacteria by UVC-LED, and elucidates the mechanism and influencing factors for inactivation and reactivation by UVC-LED. The study also highlights that adequate UVC-LED irradiation and avoidance of visible light after UVC-LED disinfection can effectively inhibit bacterial reactivation. Our findings form a reference for the design and operation of UV disinfection in aquaculture.


Citations (2)


... The secretions and excreta of P. canaliculata contain diverse symbiotic bacteria, among which Aeromonas represents a prominent group colonizing the intestinal tract (Chen et al. 2021;Li et al. 2019Li et al. , 2022. Recent research has demonstrated that the secretions of P. canaliculata can release diverse pathogenic bacteria and threat the safety of native aquatic animals Sui et al. 2024). L. hoffmeisteri is sensitivity to environmental microorganisms, the pathogens released by P. canaliculata into their ecosystem are likely a significant factor in the reduction of their populations . ...

Reference:

Effect of Pomacea canaliculata on Limnodrilus hoffmeisteri: Behavior, Oxidative Stress, and Microbiota Alterations
Responses of survival, antioxidant system and intestinal microbiota of native snail Bellamya purificata to the invasive snail Pomacea canaliculata

... Thus, to ensure safely treated water by UV-based systems without combined chemical products, it is crucial to understand the mechanism of bacterial regrowth in the post-UV disinfection phase, as well as the possibility of controlling regrowth through induced cellular damage by radiation dosage (Wang, 2021;Zhang et al., 2023). Hence, this study aimed to verify, on bench scale, the possibility of minimizing bacterial regrowth by increasing the UV radiation dose applied to the disinfection of groundwater. ...

Study on the inactivation and reactivation mechanism of pathogenic bacteria in aquaculture by UVC-LED