scholarly journals Investigation on Prevalence of Sparganum mansoni Infection in Wild Frogs on Hainan Island of China

2020 ◽  
Author(s):  
Ruijia Fu ◽  
Pei Liang ◽  
Gang LU ◽  
Jinbao Gu ◽  
Dayong Wang
Keyword(s):  
South China Sea ◽  
Infection Rate ◽  
South China ◽  
Natural Infection ◽  
Hainan Island ◽  
Open Wound ◽  
Potential Threat ◽  
Local Populations ◽  
Food Borne ◽  
The Mainland Of China

Abstract Background: Sparganosis is a serious food-borne parasitic zoonosis, which is mainly caused by ingesting or open-wound contact of the frog flesh infected by Sparganum mansoni, or even by intake of the water contaminated by the parasite. The purpose of the study was to explore the prevalence of sparganum infection in wild frogs distributed throughout the Hainan Island, which is the largest island of the mainland of China and located at the northwest of the South China Sea, and to analyze the risk in local populations to suffer from sparganosis.Methods: From 2018 to 2020, wild frogs were collected from rural ponds, rivers and farmlands in different cities and counties throughout the Hainan Island. After weighing and marking of the frogs, the sparganums were examined and isolated. The sites of the parasite and the number of infections of each frog were recorded and analyzed by statistics analysis.Results: A total of 1556 of wild frogs were examined and isolated. 201 wild frogs were found to be infected by sparganum, and the natural infection rate of sparganum in wild frogs was 12.92% (201/1556). There were 612 sparganums found in the frogs, and the average was 3.04 per frog, while the highest infection rate of wild frogs was in Baoting, up to 32.93% (27/82). The infection rate of sparganum in wild frogs in the central region of Hainan Island is higher than other regions. Most sparganums were located in the hind legs of frog, and the number of the sparganum infection in the frogs was not related to the species and weight of the frogs.Conclusions: On Hainan Island, sparganum infection in wild frogs is relatively common, and constitutes a potential threat to human. Effective measures should be taken to control the incidence of sparganosis.

scholarly journals Evaluation of HRCLDAS and ERA5 Datasets for Near-Surface Wind over Hainan Island and South China Sea

Atmosphere ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 766
Author(s):  
Yi Jiang ◽  
Shuai Han ◽  
Chunxiang Shi ◽  
Tao Gao ◽  
Honghui Zhen ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Surface Wind ◽  
Hainan Island ◽  
The South China Sea ◽  
Wind Data ◽  
The South ◽  
Near Surface ◽  
China Sea

Near-surface wind data are particularly important for Hainan Island and the South China Sea, and there is a wide range of wind data sources. A detailed understanding of the reliability of these datasets can help us to carry out related research. In this study, the hourly near-surface wind data from the High-Resolution China Meteorological Administration (CMA) Land Data Assimilation System (HRCLDAS) and the fifth-generation ECMWF atmospheric reanalysis data (ERA5) were evaluated by comparison with the ground automatic meteorological observation data for Hainan Island and the South China Sea. The results are as follows: (1) the HRCLDAS and ERA5 near-surface wind data trend was basically the same as the observation data trend, but there was a smaller bias, smaller root-mean-square errors, and higher correlation coefficients between the near-surface wind data from HRCLDAS and the observations; (2) the quality of HRCLDAS and ERA5 near-surface wind data was better over the islands of the South China Sea than over Hainan Island land. However, over the coastal areas of Hainan Island and island stations near Sansha, the quality of the HRCLDAS near-surface wind data was better than that of ERA5; (3) the quality of HRCLDAS near-surface wind data was better than that of ERA5 over different types of landforms. The deviation of ERA5 and HRCLDAS wind speed was the largest along the coast, and the quality of the ERA5 wind direction data was poorest over the mountains, whereas that of HRCLDAS was poorest over hilly areas; (4) the accuracy of HRCLDAS at all wind levels was higher than that of ERA5. ERA5 significantly overestimated low-grade winds and underestimated high-grade winds. The accuracy of HRCLDAS wind ratings over the islands of the South China Sea was significantly higher than that over Hainan Island land, especially for the higher wind ratings; and (5) in the typhoon process, the simulation of wind by HRCLDAS was closer to the observations, and its simulation of higher wind speeds was more accurate than the ERA5 simulations.

scholarly journals Newly discovered seagrass beds and their potential for blue carbon in the coastal seas of Hainan Island, South China Sea

2017 ◽  
Vol 125 (1-2) ◽  
pp. 513-521 ◽  
Author(s):  
Zhijian Jiang ◽  
Songlin Liu ◽  
Jingping Zhang ◽  
Chunyu Zhao ◽  
Yunchao Wu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Hainan Island ◽  
Blue Carbon ◽  
Seagrass Beds ◽  
China Sea

Morphology and molecular phylogeny of Ostreopsis cf. ovata and O. lenticularis (Dinophyceae) from Hainan Island, South China Sea

2017 ◽  
Vol 66 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Hua Zhang ◽  
Songhui Lu ◽  
Yang Li ◽  
Jingyi Cen ◽  
Hualong Wang ◽  
...  
Keyword(s):  
South China Sea ◽  
Molecular Phylogeny ◽  
South China ◽  
Hainan Island ◽  
China Sea

Extensive cryptic diversity of giant clams (Cardiidae: Tridacninae) revealed by DNA-sequence-based species delimitation approaches with new data from Hainan Island, South China Sea

2020 ◽  
Vol 86 (1) ◽  
pp. 56-63 ◽  
Author(s):  
Jun Liu ◽  
Dan Cui ◽  
Hui Wang ◽  
Jiawei Chen ◽  
Helu Liu ◽  
...  
Keyword(s):  
South China Sea ◽  
South China ◽  
Species Delimitation ◽  
Strong Support ◽  
Hainan Island ◽  
The Philippines ◽  
Nominal Species ◽  
Cryptic Diversity ◽  
China Sea ◽  
Giant Clams

Abstract Accurate species delimitation is important, especially for endangered species. As one of the most conspicuous bivalve taxa, giant clams are threatened throughout their geographic range. Many phylogeographic studies have revealed strong population structure among giant clams in the Indo-Pacific, suggesting cryptic diversity within these species. However, less attention has been paid to their identification and delimitation. In this study, we assembled a comprehensive dataset of mitochondrial cytochrome c oxidase subunit I (COI) sequences for Tridacna species, focusing on new sequences from Hainan Island in the South China Sea and previously published ones from Japan, Taiwan, Singapore, the Philippines, Indonesia, Australia, the Solomon Islands and the Red Sea. Three nominal species, Tridacna crocea, T. squamosa and T. noae, were recognized at Hainan Island on the basis of distance-based DNA barcoding, with mean interspecific K2P distances of 10.6–24.7% for seven Tridacna species (T. crocea, T. squamosa, T. noae, T. maxima, T. mbalavuana, T. derasa and T. gigas). The most abundant species, T. noae, represents the first record of this species from Hainan Island. Using a combination of phylogenetic and DNA-based species delimitation analyses (automatic barcode gap discovery, generalized mixed Yule coalescent and Bayesian Poisson tree processes), we found strong support for a total of 13 operational taxonomic units (OTUs) for the seven nominal Tridacna species. These results, coupled with the fact that each OTU occupies different regions in the Indo-Pacific, strongly suggest multiple cryptic species of giant clams. Our findings point to the need for taxonomic revisionary work on giant clams throughout the Indo-Pacific; such work will have important conservation implications.

New species of the giant deep-sea isopod genus Bathynomus (Crustacea, Isopoda, Cirolanidae) from Hainan Island, South China Sea

2017 ◽  
Vol 12 (4) ◽  
pp. 283-291 ◽  
Author(s):  
Qi KOU ◽  
Jun CHEN ◽  
Xinzheng LI ◽  
Lisheng HE ◽  
Yong WANG
Keyword(s):  
New Species ◽  
South China Sea ◽  
South China ◽  
Deep Sea ◽  
Hainan Island ◽  
China Sea
Sign in / Sign up

Export Citation Format

Share Document