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ATIQUE USMAN,안광국 한국생태학회 2022 Journal of Ecology and Environment Vol.46 No.1
Background: Due to the rapidly changing climatic conditions, South Korea faces the grand challenge of exotic species. With the increasing human movement, the influx of alien species to novel regions is prevalent across the globe. The latest research suggests that it is easy to prevent the introduction and establishment of alien species rather than controlling their spread and eradication. Like other countries, the Korean Ministry of Environment released a list (in 2018) of 45 potential risky exotic fish species considered likely to be invasive candidate fish species if they ever succeed in entering the Korean aquatic ecosystems. Results: The investigation into the invasion suitability traits showed that potential risky fish species could utilize those features in becoming invasive once they arrive in the Korean aquatic ecosystems. If the novel species establish viable populations, they are likely to incur higher economic costs, damage the native aquatic fauna and flora, and jeopardize the already perilled species. Furthermore, they can damage the installed infrastructure, decline overall abundance and biodiversity, and disturb the ecosystem services. Here we reviewed the list of fish species concerning their family, native origin, preferred aquatic biomes, main food items, current status in Korea, and potential threats to humans and the ecosystems. Data shows that most species are either already designated as invasive in the neighboring counties, including Japan, Vietnam, Thailand, and China, or originate from these countries. Such species have a higher climate match with the Korean territories. Conclusions: Therefore, it is exceptionally essential to study their most critical features and take regulatory measures to restrict their entry. The incoming fish species must be screened before letting them in the country in the future. The regulatory authorities must highlight the threatening traits of such species and strictly monitor their entrance. Detailed research is required to explore the other species, especially targeting the neighboring countries fish biodiversity, having demonstrated invasive features and matching the Korean climate.
Md Atique Ahmed,Hae-Ji Kang,전복실 대한기생충학ㆍ열대의학회 2019 The Korean Journal of Parasitology Vol.57 No.4
Human infections due to the monkey malaria parasite Plasmodium knowlesi is increasingly being reported from most Southeast Asian countries specifically Malaysia. The parasite causes severe and fatal malaria thus there is a need for urgent measures for its control. In this study, the level of polymorphisms, haplotypes and natural selection of full-length pk- msp8 in 37 clinical samples from Malaysian Borneo along with 6 lab-adapted strains were investigated. Low levels of poly- morphism were observed across the full-length gene, the double epidermal growth factor (EGF) domains were mostly con- served, and non-synonymous substitutions were absent. Evidence of strong negative selection pressure in the non-EGF regions were found indicating functional constrains acting at different domains. Phylogenetic haplotype network analysis identified shared haplotypes and indicated geographical clustering of samples originating from Peninsular Malaysia and Malaysian Borneo. This is the first study to genetically characterize the full-length msp8 gene from clinical isolates of P. knowlesi from Malaysia; however, further functional characterization would be useful for future rational vaccine design.
하천 어류군집에 기반한 생태학적 건강도 악화를 초래하는 대규모 보 건설의 영향
우스만아티크 ( Usman Atique ),마문MD ( Md Mamun ),남스라이자갈 ( Namsrai Jargal ),안광국 ( Kwang-guk An ) 한국환경생태학회 2021 한국환경생태학회 학술대회지 Vol.2021 No.2
Massive weirs installations in larger rivers could be strongly detrimental to the ecosystem services, water chemistry, and fish assemblages due to unpredicted hydrological modifications and new microhabitat features. This study highlighted the impact of three gigantic weirs erected in Geum River during 2010-2017 compared to the riverine zones from upstream to downstream. Nineteen water quality parameters were studied at 21 sites, while fish assemblages were investigated at 26 sites. The data evaluations included the application of index of biotic integrity (IBI), water pollution index (WPI), and principal component analysis (PCA). The results disclosed seasonal and spatial heterogeneities indicating gradual water quality degradation. TOC, ambient ratios (N:P), Chl-a, and conductivity are dissimilar, while BOD, COD, TSS, TP, and fecal coliforms are directly influenced by seasonal precipitation. Nutrients (N, P) exhibited week relationships in weirs (GW: R2 = 0.21, SW: R2 = 0.12, BW: R2 = 0.25), but stronger in the upstream zone (R2 = 0.74) of the river. WPI, however, designated the weirs and river zones into ‘fair to very poor’ water quality status. Likewise, the ecological health based on IBI specified sites into ‘fair to poor’ health. Overall, 60 fish species and 64637 fish individuals were observed, with 81.24% individuals observed at the weir sites, while Squalidus japonicus coreanus (18.47 % RA) and Hemibarbus labeo (9.25 % RA) were relatively the most abundant fish species sampled. The number of fish species and the total number of individuals gradually declined along the river gradient. PCA grouped the dominant factors in the different zones of the river with a percent cumulative variance 81.80%. The tolerant and omnivorous fish species confirmed aggregations at the downstream zone accompanied by increased insectivorous species. In conclusion, the impacts of weir installation manifested assiduously and indicted increasingly deteriorating water chemistry, gradually declining fish assemblages with jumbled distribution, perturbed microhabitat conditions, and inclusively deteriorating ecological health status.
토지이용도, 유기물, Chl-a의 영양염류간의 상호작용 및 장마철 강우 시 영양염류 상태에 따른 농업용 저수지의 분류
우스만아티크 ( Usman Atique ),블랜디나제네스카코레 ( Blandina Genes Kakore ),안광국 ( Kwang-guk An ) 한국환경생태학회 2021 한국환경생태학회 학술대회지 Vol.2021 No.2
This study explored a range of agricultural reservoirs characterized according to their land-use patterns. The classifications included cropland, forest, urban and estuarine regions in the South Korean peninsula during 2008-2017. We analyzed the inter-annual and seasonal water quality deviation with monsoon precipitation intensity, and empirical models were developed on nutrients, their ambient ratios, and chlorophyll-a (Chl-a), total organic carbon (TOC), and ratios of chlorophyll-a with nutrient contributing factors. The multi-metric water pollution index (WPIKR) reflected the chemical health of reservoirs in relation to monsoon and land use patterns. The results indicated the intensity of monsoon rainfall tremendously influenced nutrients, Chl-a, and TOC levels in the cropland and urban reservoirs. However, TOC disclosed highest relationship with Chl-a in cropland (R2 = 0.66) and forest (R2 = 0.71) regions. Secchi disk depth (SDD) negatively correlated with the solids regime, TP and Chl-a in the cropland and estuarine regions. On the other hand, the trophic state index specified the majority of reservoirs in zooplankton grazing state except a few in the estuarine region showing the propensity of blue-green algae presence. Further principal component analysis (PCA) designated cropland region characterized by higher TP and Chl-a level within increasing Carlson’s trophic state index (CTSI), the urban region receiving higher sediments and chemical oxygen demand. On the contrary, the forest region tended to have higher organic matter (TOC), while estuarine was characterized by higher electrical conductivity (EC). Hierarchical cluster analysis (HCA) showed that cropland region reservoirs are nearer to urban reservoirs in deteriorating water quality. Based on WPIKR results, cropland and urban region reservoirs reflected as ‘poor’, estuarine as ‘fair’ condition while forest region indicated ‘excellent to good’ chemical health status. According to CTSI, forest and estuarine reservoirs were in the oligotrophic state, urban in mesotrophic and cropland region reservoirs from mesotrophic to eutrophic state. This study advocates a reduction in phosphorus yielding fertilizers in the Korean Peninsula that could help to mitigate the impending eutrophication events in lentic ecosystems in the future.
다목적 음용수 시설에서의 다변량 기법에 의한 시공간적 계절 수질 평가
우스만아티크 ( Usman Atique ),마문MD ( Md Mamun ),안광국 ( Kwang-guk An ) 한국환경생태학회 2021 한국환경생태학회 학술대회지 Vol.2021 No.2
A long-term water quality evaluation of critical water quality determinants was planned to explore a sustainable water quality supply and management suitability. We analyzed the spatio-seasonal variabilities of ambient nutrients and their enrichment, sestonic chlorophyll-a (CHL-a), the influence of flow regime, and monsoon precipitation through multivariate techniques (PCA, DA) in the second-largest reservoir in South Korea during 2010 -2020. The outcomes sharply defined the maneuvering role of monsoon-mediated flow regime effects on reservoir water chemistry. The reservoir showed a poor to average nutrient condition. An occasional emergence of total coliform bacteria (TCB) of 16000 MPNmL-100 at S3 may break out the waterborne diseases among the children. The Mann-Kendal test exhibited a consistent increase in water temperature (WT), conductivity, and chemical oxygen demand (COD), which may critically endanger a safer drinking water supply. Drought and flood dynamics showed seasonal heterogeneities in CHL-a, TCB, total suspended solids (TSS), and nutrients (N, P). The N:P ambient ratios are a more reliable predictor of sestonic CHL-a productivity, while the reservoir is P-limited. Total phosphorus (TP) showed a strong negative (R2 = 0.59), while TSS (R2 = 0.50) and CHL-a (R2 = 0.32) displayed a strong positive association with reservoir outflow, indicating flow regime impact on enhancing water quality and clarity. Seasonal trophic state index revealed oligo-mesotrophic nutrient enrichment, a good sign for long-term water quality management with limited risk of eutrophication. In conclusion, monsoon arbitrated the flood and drought conditions and disturbed the flow regime influencing the seasonal water quality. Furthermore, increasing intensive crop farming may threaten oligotrophic nutrient enrichment.
Lu, Feng,Ahmed, Md Atique,Xu, Simin,Xu, Sui,Han, Jin-Hee,Liu, Qianyan,Chen, Jing,Zhu, Guoding,Zhou, Huayun,Cao, Jun,Han, Eun-Taek ELSEVIER 2019 INFECTION GENETICS AND EVOLUTION Vol.70 No.-
<P><B>Abstract</B></P> <P>Imported malaria due to <I>Plasmodium ovale curtisi</I> and <I>P</I>. <I>ovale wallikeri</I> infections from African countries has increased recently (2011–2014) in Chinese travelers. We report novel genotypes, their prevalence and the predominant haplotypes of <I>P</I>. <I>ovale curtisi</I> and <I>P</I>. <I>ovale wallikeri</I> circumsporozoite protein (CSP) from 20 African countries in Chinese travelers. These genotypes should be considered while designing a CSP-based vaccine against <I>P</I>. <I>ovale</I> malaria.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This is the first to report the <I>csp</I> genotypes and their heterogeneity for <I>P. ovale curtisi</I> and <I>P. ovale wallikeri</I> parasites from African countries. </LI> <LI> Ten <I>csp</I> genotypes of <I>P</I>. <I>ovale curtisi</I> and 13 <I>csp</I> genotypes of <I>P</I>. <I>ovale wallikeri</I> based on the arrangement of central repeat motifs were found. </LI> <LI> Fifteen <I>csp</I> haplotypes of <I>P</I>. <I>ovale curtisi</I> and 10 <I>csp</I> haplotypes of <I>P</I>. <I>ovale wallikeri</I> on central repeat motifs were identified. </LI> <LI> These genotypes should be considered while designing a CSP-based vaccine against <I>P</I>. <I>ovale</I> malaria. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>