Abstract
Chiggers are common ectoparasites and the exclusive vector of scrub typhus. Based on previous investigations from a unique geographical area in Yunnan Province of southwest China, the Three Parallel Rivers Area, we retrospectively studied the species diversity and related ecology of chiggers on rodents and other small mammals. A very high species diversity of 120 chigger species was identified. Five dominant chigger species accounted for 59.4% (5238/8965) of total chiggers, and among them Leptotrombidium scutellare is the second major vector of scrub typhus in China. Species diversity of the chigger community fluctuates greatly in different altitudinal and latitudinal gradients. There are significant differences in species composition, species diversity and dominant species of chiggers among hosts with apparent community heterogeneity. Based on the species abundance distribution, the expected total number of chigger species was estimated to be 170, 50 more than the number of actually collected species; this further indicates a very high chigger species diversity in this area. The bipartite ecological network analysis revealed the intricate relationships between chigger and host species—positive and negative correlations existed among some species of dominant and vector chiggers.
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Data availability
The experimental data used to support the findings of this study are available from the corresponding author on request.
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Acknowledgements
We are very grateful to the following people who contributed to the field investigations and laboratory work: Yun-Ji Zou, Qiao-Hua Wang, Wen-Ge Dong, Peng-Biao Yang, Pei-Ying Peng, Yong Zhang, Cong-Hua Gao, Nan Zhao, Jian-Chang He, Guo-Li Li, Yan-Liu Li, Xue-Song He, De-Cai Ouyang, and several colleagues and college students.
Funding
The research leading to these results received funding from the National Natural Science Foundation of China under Grant Agreement No. 82160400 and the Major Science and Technique Programs in Yunnan Province under Grant Agreement No. 202102AA310055-X to Xian-Guo Guo, and the Expert workstation for Dao-Chao Jin in Dali Prefecture.
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Conceptualization, funding acquisition, project administration, resources, supervision, validation, and writing—review & editing, X-GG; supervision, D-CJ; data cura-tion, formal analysis, software, visualization, and writing—original draft, YG; investigation, C-FZ, Z-WZ, RF and TC; methodology, J-XZ, YL, P-WY, W-YS. All authors have read and agreed to the published version of the manuscript.
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The capture and use of animal hosts was approved by the local wildlife affairs authority and the Animal Ethics Committee of Dali University, approval code: DLDXLL2020-1104, approval date: 4 November 2020, which followed the international standards of animal euthanasia, 2013 AVMA guidelines (Cima 2013).
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Appendices
Appendix 1: Taxonomic checklist of small mammals captured from nine survey sites in the Three Parallel Rivers Area of northwest Yunnan, China (2001–2015)
Order Rodentia
I Family Muridae
-
1.
Rattus tanezumi Temminck, 1844
-
2.
R. nitidus (Hodgson, 1845)
-
3.
R. norvegicus (Berkenhout, 1769)
-
4.
R. andamanensis Blyth, 1860
-
5.
Niviventer confucianus (Hodgson, 18736)
-
6.
N. fulvescens (Gray, 1847)
-
7.
N. andersoni (Thomas, 1911)
-
8.
N. excelsior (Thomas, 1911)
-
9.
Mus musculus L., 1758
-
10.
M. caroli Bonhote, 1902
-
11.
Apodemus draco (Barrett-Hamiliton, 1900)
-
12.
A. peninsulae (Thomas, 1906)
-
13.
A. chevrieri Milne-Edwards, 1868
-
14.
A. agrarius (Pallas, 1771)
-
15.
A. latronum Thomas, 1911
-
16.
Berylmys bowersi (Anderson, 1879)
-
17.
Micromys minutus (Pallas, 1771)
-
18.
Vernaya fulva (Allen, 1927)
-
19.
Bandicota indica (Bechstein, 1800)
II Family Cricetidae
-
20.
Eothenomys miletus (Thomas, 1914)
-
21.
E. eleusis (Thomas, 1911)
-
22.
E. proditor Hinton, 1923
-
23.
E. custos (Thomas, 1912)
III Family Sciuridae
-
24.
Callosciurus quinquestriatus (Anderson, 1871)
-
25.
Tamiops swinhoei (Milne-Edwards, 1874)
-
26.
Dremomys pernyi (Milne-Edwards, 1867)
-
27.
Rupestes forresti (Thomas, 1922)
IV Family Pteromyidae
-
28.
Petaurista albiventer (Gray, 1834)
-
29.
P. xanthotis (Milne-Edwards, 1872)
-
30.
Trogoterus xanthipes (Milne-Edwards, 1867)
-
31.
Belomys pearsonii (Gray, 1842)
-
32.
Hylopetes alboniger (Hodgson, 1836)
-
33.
Pteromys volans (L., 1758)
Order Eulipotyphla
V Family Talpidae
-
34.
Scaptonyx fusicaudus Milne-Edwrds, 1872
VI Family Soricidae
-
35.
Sorex excelsus Allen, 1923
-
36.
S. cylindricauda Milne-Edwards, 1871
-
37.
Episoriculus leucops (Hosfield, 1855)
-
38.
Suncus murinus (L., 1766)
-
39.
Crocidura attenuata Milne-Edwards, 1872
-
40.
Anourosorex squamipes Milne-Edwards, 1872
Order Scandetia
VII Family Tupaiidae
-
41.
Tupaia belangeri (Wagner, 1841)
Order Lagomorpha
VIII Family Ochotonidae
-
42.
Ochotona thibetana (Milne-Edwards, 1871)
-
43.
O. roylii (Ogilby, 1839)
Order Carnivora
IX Family Mustelidea
-
44.
Mustela kathiah Hodgson, 1835
Appendix 2: Taxonomic checklist of chiggers identified from nine survey sites in the Three Parallel Rivers Area of northwest Yunnan, China (2001–2015). Species marked with ‘**’ are proven effective vectors of scrub typhus, tsutsugamushi disease, and those with ‘*’ are potential vectors of scrub typhus
I Family Trombiculidae
Subfamily Trombiculinae
-
1.
Leptotrombidium scutellare** (Nagayo et al., 1921)
-
2.
L. sinicum Yu et al., 1981
-
3.
L. eothenomydis Yu and Yang, 1986
-
4.
L. hiemalis Yu et al., 1982
-
5.
L. rusticum Yu et al., 1986
-
6.
L. shuqui Wen et Xiang, 1984
-
7.
L. wangi Yu et al., 1986
-
8.
L. densipunctatum Yu et al., 1982
-
9.
L. yongshengense Yu and Yang, 1986
-
10.
L. yui* (Chen and Hsu, 1955)
-
11.
L. xiaguanense Yu et al., 1981
-
12.
L. imphalum** Vercammen-Grandjean and Langston, 1976
-
13.
L. gongshanense Yu et al., 1981
-
14.
L. spicanisetum Yu et al., 1986
-
15.
L. cuonae Wang et al., 1996
-
16.
L. deplanoscutum Yu et al., 1981
-
17.
L. lianghense Yu et al., 1983
-
18.
L. wenense (L. kaohuense)** Yang et al., 1959
-
19.
L. qujingense Yu et al., 1981
-
20.
L. dianchi Wen et Xiang, 1984
-
21.
L. jinmai Wen et Xiang, 1984
-
22.
L. longimedium Wen et Xiang, 1984
-
23.
L. akamushi** Barumpt, 1910
-
24.
L. alpinum Yu et Yang, 1986
-
25.
L. trapezoidum Wang et al., 1981
-
26.
L. allosetum Wang et al., 1981
-
27.
L. sinotupaium Wen et Xiang, 1984
-
28.
L. hsui Yu et al., 1986
-
29.
L. robustisetum Yu et al., 1983
-
30.
L. biluoxueshanense Yu et al., 1982
-
31.
L. cangjiangense Yu et al., 1981
-
32.
L. hupeicum Ma et Hsu, 1965
-
33.
L. apodemi* Wen et Sun, 1984
-
34.
L. intermedium* Nagayo et al., 1920
-
35.
L. biji Wen et Xiang, 1984
-
36.
L. apodevrieri Wen et Xiang, 1984
-
37.
L. suense Wen, 1984
-
38.
L. huangdi Wen et Yang, 1984
-
39.
L. zhongdianense Yu et Yang, 1981
-
40.
L. bishanense Yu et al., 1986
-
41.
L. yunlingense Yu et Zhang, 1981
-
42.
L. ejingshanense Yu et al., 1982
-
43.
L. baoshui Wen et Xiang, 1984
-
44.
L. laojunshanense Yu et al., 1986
-
45.
L. caudatum Wen et al., 1984
-
46.
L. xinjiangense Shao et Wen, 1984
-
47.
L. jianshanense Yu et al., 1982
-
48.
L. saltuosum Yu et al., 1982
-
49.
L. sexsetum Yu et Hu, 1981
-
50.
L. rupestre* Traub et Nadchatram, 1967
-
51.
L. bambicola Wen et Xiang, 1984
-
52.
L. liaoji Wen et Sun, 1984
-
53.
L. rattistae Wen et al., 1984
-
54.
L. linhuaikongense* (Wen et Hsu, 1961)
-
55.
L. miyajimai (Fukuzumi et Obata, 1951)
-
56.
L. fujianense Liao et Wang, 1983
-
57.
L. burnsi (Sasa et al., 1953)
-
58.
L. insulare** Wei et al., 1989
-
59.
L. gemiticulum (Traub et al., 1958)
-
60.
L. yunnanense Yu et al., 1980
-
61.
L. huangchuanense Yang, 1994
-
62.
L. bayanense Yang, 1994
-
63.
Trombiculindus alpinus Yu et Yang, 1979
-
64.
T. yunnanus Wang et Yu, 1965
-
65.
T. cuneatus Traub et Evans, 1951
-
66.
T. bambusoides Wang et Yu, 1965
-
67.
T. nujiange Wen et Xiang, 1984
-
68.
Neotrombicula longmenis Wen et Xiang, 1984
-
69.
N. deqinensis Yu et Wang, 1981
-
70.
N. japonica (Tanaka et al., 1930)
-
71.
N. tongtianhensis Yang et al., 1995
-
72.
N. aeretes Hsu et Yang, 1985
-
73.
N. microtomici Wen et al., 1984
-
74.
N. microti (Ewing, 1928)
-
75.
Microtrombicula nadchatrami Vercammen-Grandjean, 1965
-
76.
Helenicula hsui Zhao, 1990
-
77.
H. lanius (Radford, 1946)
-
78.
Doloisia brachypus (Audy et Nadchatram, 1957)
-
79.
D. taishanensis Teng, 1982
-
80.
D. furcipelta Yu et al., 1983
-
81.
Ascoschoengastia indica* (Hirst, 1915)
-
82.
A. yunnanensis Yu et al., 1980
-
83.
A. leechi (Domrow, 1962)
-
84.
A. menghaiensis Yu et al., 1986
-
85.
A. rattinorvegici Wen, 1984
-
86.
Herpetacarus spinosetosus Wang et al., 1980
-
87.
H. tenuiclavus Yu et al., 1979
-
88.
H. hastoclavus Yu et al., 1979
-
89.
Euschoengastia weifangensis Teng et Zhang, 1989
Subfamily Gahrliepiinae Womersley, 1952
-
90.
Walchia pacifica* (Chen et Hsu, 1955)
-
91.
W. parapacifica (Chen et al., 1955)
-
92.
W. micropelta (Traub et Evans, 1957)
-
93.
W. chinensis* (Chen et Hsu, 1955)
-
94.
W. kor (Chen et Hsu, 1957)
-
95.
W. enode Gater, 1932
-
96.
W. sheensis Wen, 1984
-
97.
W. xishaensis Zhao et al., 1986
-
98.
W. ewingi (Fuller, 1949)
-
99.
Schoengastiella ligula Radford, 1946
-
100.
Gahrliepia zhongwoi Wen et Xiang, 1984
-
101.
G. longipedalis Yu et Yang, 1986
-
102.
G. radiopunctata Hsu et al., 1965
-
103.
G. octosetosa Chen et al., 1956
-
104.
G. latiscutata Chen et Fan, 1981
-
105.
G. lengshui Wen et Xiang, 1984
-
106.
G. yangchenensis Chen et Hsu, 1957
-
107.
G. deqinensis Yu et Yang, 1982
-
108.
G. tenuiclava Yu et al., 1983
-
109.
G. tenella Traub et Morrow, 1955
-
110.
G. chekiangensis Chu, 1964
-
111.
G. yunnanensis Hsu et al., 1965
-
112.
G. chungkingensis Jeu et al., 1963
-
113.
G. megascuta Hsu et al., 1965
-
114.
G. madun Wen et Xiang, 1984
-
115.
G. linguipelta Jeu et al., 1983
-
116.
G. fimbriata Traub et Morrow, 1955
-
117.
Intermedialia hegu (Yu, Yang et Wu, 1979)
II Family Leeuwenhoekiidae
Subfamily Leeuwenhoekiinae
-
118.
Chatia maoyi Wen et Xiang, 1984
-
119.
C. alpine Shao et Wen, 1984
-
120.
Shunsennia scabrisetosa Huang, 1986
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Guo, Y., Zhou, JX., Guo, XG. et al. Species diversity and related ecology of chiggers on small mammals in a unique geographical area of Yunnan Province, southwest China. Exp Appl Acarol 91, 439–461 (2023). https://doi.org/10.1007/s10493-023-00841-z
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DOI: https://doi.org/10.1007/s10493-023-00841-z