Seasonal variations of intensity of avian malaria infection in the Thousand Island Lake System, China
(2023) In Parasites and Vectors 16.- Abstract
Background: Migratory birds play an important part in the spread of parasites, with more or less impact on resident birds. Previous studies focus on the prevalence of parasites, but changes in infection intensity over time have rarely been studied. As infection intensity can be quantified by qPCR, we measured infection intensity during different seasons, which is important for our understanding of parasite transmission mechanisms. Methods: Wild birds were captured at the Thousand Island Lake with mist nets and tested for avian hemosporidiosis infections using nested PCR. Parasites were identified using the MalAvi database. Then, we used qPCR to quantify the infection intensity. We analyzed the monthly trends of intensity for all species... (More)
Background: Migratory birds play an important part in the spread of parasites, with more or less impact on resident birds. Previous studies focus on the prevalence of parasites, but changes in infection intensity over time have rarely been studied. As infection intensity can be quantified by qPCR, we measured infection intensity during different seasons, which is important for our understanding of parasite transmission mechanisms. Methods: Wild birds were captured at the Thousand Island Lake with mist nets and tested for avian hemosporidiosis infections using nested PCR. Parasites were identified using the MalAvi database. Then, we used qPCR to quantify the infection intensity. We analyzed the monthly trends of intensity for all species and for different migratory status, parasite genera and sexes. Results: Of 1101 individuals, 407 were infected (37.0%) of which 95 were newly identified and mainly from the genus Leucocytozoon. The total intensity trend shows peaks at the start of summer, during the breeding season of hosts and during the over-winter season. Different parasite genera show different monthly trends. Plasmodium causes high prevalence and infection intensity of winter visitors. Female hosts show significant seasonal trends of infection intensity. Conclusions: The seasonal changes of infection intensity is consistent with the prevalence. Peaks occur early and during the breeding season and then there is a downward trend. Spring relapses and avian immunity are possible reasons that could explain this phenomenon. In our study, winter visitors have a higher prevalence and infection intensity, but they rarely share parasites with resident birds. This shows that they were infected with Plasmodium during their departure or migration and rarely transmit the disease to resident birds. The different infection patterns of different parasite species may be due to vectors or other ecological properties.
(Less)
- author
- Han, Yuxiao LU ; Hellgren, Olof LU ; Wu, Qiang ; Liu, Juan ; Jin, Tinghao ; Bensch, Staffan LU and Ding, Ping
- organization
- publishing date
- 2023
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Avian malaria, Bird migration, Disease dynamics, Hemosporidia, Infection intensity
- in
- Parasites and Vectors
- volume
- 16
- article number
- 218
- publisher
- BioMed Central (BMC)
- external identifiers
-
- pmid:37403099
- scopus:85164025741
- ISSN
- 1756-3305
- DOI
- 10.1186/s13071-023-05848-4
- language
- English
- LU publication?
- yes
- id
- 2c9eac0e-d32b-4d71-a37c-7f4d8fc5ebba
- date added to LUP
- 2023-08-29 15:30:37
- date last changed
- 2024-04-20 02:10:02
@article{2c9eac0e-d32b-4d71-a37c-7f4d8fc5ebba,
abstract = {{<p>Background: Migratory birds play an important part in the spread of parasites, with more or less impact on resident birds. Previous studies focus on the prevalence of parasites, but changes in infection intensity over time have rarely been studied. As infection intensity can be quantified by qPCR, we measured infection intensity during different seasons, which is important for our understanding of parasite transmission mechanisms. Methods: Wild birds were captured at the Thousand Island Lake with mist nets and tested for avian hemosporidiosis infections using nested PCR. Parasites were identified using the MalAvi database. Then, we used qPCR to quantify the infection intensity. We analyzed the monthly trends of intensity for all species and for different migratory status, parasite genera and sexes. Results: Of 1101 individuals, 407 were infected (37.0%) of which 95 were newly identified and mainly from the genus Leucocytozoon. The total intensity trend shows peaks at the start of summer, during the breeding season of hosts and during the over-winter season. Different parasite genera show different monthly trends. Plasmodium causes high prevalence and infection intensity of winter visitors. Female hosts show significant seasonal trends of infection intensity. Conclusions: The seasonal changes of infection intensity is consistent with the prevalence. Peaks occur early and during the breeding season and then there is a downward trend. Spring relapses and avian immunity are possible reasons that could explain this phenomenon. In our study, winter visitors have a higher prevalence and infection intensity, but they rarely share parasites with resident birds. This shows that they were infected with Plasmodium during their departure or migration and rarely transmit the disease to resident birds. The different infection patterns of different parasite species may be due to vectors or other ecological properties. <br/></p>}},
author = {{Han, Yuxiao and Hellgren, Olof and Wu, Qiang and Liu, Juan and Jin, Tinghao and Bensch, Staffan and Ding, Ping}},
issn = {{1756-3305}},
keywords = {{Avian malaria; Bird migration; Disease dynamics; Hemosporidia; Infection intensity}},
language = {{eng}},
publisher = {{BioMed Central (BMC)}},
series = {{Parasites and Vectors}},
title = {{Seasonal variations of intensity of avian malaria infection in the Thousand Island Lake System, China}},
url = {{http://dx.doi.org/10.1186/s13071-023-05848-4}},
doi = {{10.1186/s13071-023-05848-4}},
volume = {{16}},
year = {{2023}},
}