Avian Haemosporidian Parasites: Causes and Consequences of Infection

A special issue of Animals (ISSN 2076-2615). This special issue belongs to the section "Birds".

Deadline for manuscript submissions: 31 December 2024 | Viewed by 9168

Special Issue Editor


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Guest Editor
Department of Evolutionary Ecology, Museo Nacional de Ciencias Naturales (CSIC), 28006 Madrid, Spain
Interests: factors affecting Haemosporidian transmission and effects on birds and vectors; bird related factors; climate effects on transmissions and host infections; factors affecting distribution and incidence of infections; bird-Haemosporidian-vector interactions

Special Issue Information

Dear Colleagues,

Over the last few decades, there have been important advances in our knowledge regarding bird Haemosporidians, especially in terms of their diversity, taxonomy, specificity and distribution. These advances allow for a better comprehension of the interactions between parasites and hosts and of the parasite effects on hosts, as well as of the factors that increase the risk of infections and their control. The development and application of molecular techniques to detect and identify parasites speed up the development of this area of research.

However, there is still much to be uncovered in terms of our understanding of the causes of the infection and its relapse in birds, as well as of the factors modulating their effects on the hosts both at the individual and population levels. Some studies, mostly in captive hosts, point to an effect caused by hormones on the increase in infections on peripheral blood but without reaching firm conclusions. In addition, medication experiments and long-term studies have allowed researchers to determine important detrimental effects of infections in birds although these results are usually obscured by the potential interaction of several concurrent infections within the same individual. There is a plethora of factors that wild animals confront in their life which can influence their possibility to be infected and to suffer from more or less important consequences of these infections. In addition, factors that indirectly affect the vertebrate host could be highly important for invertebrate hosts transmitting infections to birds. The interaction between vectors, parasites and birds is still being explored in many cases. Thus, there is a need for important research advancement in these areas.

The aim of this Special Issue is to present recent research and reviews on the causes and consequences of Haemosporidian infections in birds from different perspectives and at different levels, from the individual to the population, with the aim of stimulating interest, understanding and exploration of this important subject.

Prof. Dr. Santiago Merino Rodríguez
Guest Editor

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Keywords

  • factors affecting Haemosporidian transmission and effects on birds and vectors
  • bird-related factors
  • climate effects on transmissions and host infections
  • factors affecting distribution and incidence of infections
  • bird–Haemosporidian–vector interactions

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Published Papers (4 papers)

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Research

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16 pages, 1048 KiB  
Article
The Impact of Avian Haemosporidian Infection on Feather Quality and Feather Growth Rate of Migratory Passerines
by Carlos Mora-Rubio, Luz Garcia-Longoria, Martina Ferraguti, Sergio Magallanes, João T. Cruz, Florentino de Lope and Alfonso Marzal
Animals 2024, 14(12), 1772; https://doi.org/10.3390/ani14121772 - 12 Jun 2024
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Abstract
Bird feathers have several functions, including flight, insulation, communication, and camouflage. Since feathers degrade over time, birds need to moult regularly to maintain these functions. However, environmental factors like food scarcity, stress, and parasite infections can affect feather quality and moult speed. This [...] Read more.
Bird feathers have several functions, including flight, insulation, communication, and camouflage. Since feathers degrade over time, birds need to moult regularly to maintain these functions. However, environmental factors like food scarcity, stress, and parasite infections can affect feather quality and moult speed. This study examined the impact of avian haemosporidian infection and uropygial gland volume, as well as feather quality and feather growth rate in two migratory hirundine species captured in southwestern Spain—the house martin (Delichon urbicum) and sand martin (Riparia riparia). Our findings showed that the prevalence of infection varied among species, with house martins having the highest rates, possibly due to their larger colony size. Moreover, haemosporidian infection had a different impact on each species; infected house martins exhibited lower feather quality than healthy individuals, although this outcome was not observed in sand martins. Furthermore, no effect of infection on feather growth rate was observed in both hirundinids. Additionally, feather growth rate only correlated positively with feather quality in house martins. Finally, no link was observed between uropygial gland volume and feather quality or feather growth rate in any of the species in this study. These findings highlight the effect of haemosporidian infections on the plumage of migratory birds, marking, for the first time, how avian haemosporidian infection is shown to adversely impact feather quality. Even so, further research is needed to explore these relationships more deeply. Full article
(This article belongs to the Special Issue Avian Haemosporidian Parasites: Causes and Consequences of Infection)
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16 pages, 911 KiB  
Article
Avian Haemosporidian Infection in Wildlife Rehabilitation Centres of Portugal: Causes, Consequences, and Genetic Diversity
by João T. Cruz, Luís Madeira de Carvalho, Mariana Ribeiro Ferreira, Carolina Nunes, María Casero and Alfonso Marzal
Animals 2024, 14(8), 1216; https://doi.org/10.3390/ani14081216 - 18 Apr 2024
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Abstract
In the last decade, over 40% of bird species in Europe have experienced poor and bad conservation status, with more than 30% of bird species in mainland Portugal threatened with extinction. Along with anthropogenic factors, parasites and pathogens such as avian haemosporidians have [...] Read more.
In the last decade, over 40% of bird species in Europe have experienced poor and bad conservation status, with more than 30% of bird species in mainland Portugal threatened with extinction. Along with anthropogenic factors, parasites and pathogens such as avian haemosporidians have been suggested to be responsible for these avian population declines. Wildlife rehabilitation centres play an essential role in species conservation and preservation. Moreover, animals admitted for rehabilitation can provide valuable information regarding transmission and pathogenicity of many diseases that affect wild birds that are rarely sampled in nature. However, reports of haemosporidians in captive birds are still limited. Here, we explored the prevalence and genetic diversity of avian haemosporidians in 89 birds from 29 species admitted to rehabilitation centres in Portugal, showing an overall infection prevalence of 30.3%. The prevalence of infection was higher in Strigiformes and in birds admitted to rehabilitation centres due to debilitating diseases. Remarkably, 30% of the infected bird species have not been found to harbour malaria parasites in preceding studies. We detected 15 different haemosporidian lineages infecting a third of bird species sampled. Notably, 2 out of these 15 detected haemosporidian lineages have not been obtained previously in other studies. Furthermore, we also identified nine new host–parasite interactions representing new host records for these haemosporidian parasites. Finally, our results revealed that birds infected with haemosporidians require longer rehabilitation treatments, which increase the economic costs for rehabilitation and may impair their survival prospects. These findings emphasise the importance of integrating haemosporidian infection considerations into rehabilitation protocols, highlighting the challenges posed by these infections in avian conservation and rehabilitation, including economic and logistical demands. Full article
(This article belongs to the Special Issue Avian Haemosporidian Parasites: Causes and Consequences of Infection)
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17 pages, 3686 KiB  
Article
Prevalence and Diversity of Blood Parasites (Plasmodium, Leucocytozoon and Trypanosoma) in Backyard Chickens (Gallus gallus domesticus) Raised in Southern Thailand
by Kanpapat Boonchuay, Thotsapol Thomrongsuwannakij, Carolina Romeiro Fernandes Chagas and Pornchai Pornpanom
Animals 2023, 13(17), 2798; https://doi.org/10.3390/ani13172798 - 3 Sep 2023
Cited by 3 | Viewed by 3886
Abstract
Avian malaria and leucocytozoonosis can cause fatal diseases, whereas avian trypanosomiasis is reported to be harmless in chickens. Backyard chickens can be infected by several pathogens, including blood parasites, that may shed to industrial poultry production, with a consequently higher economic impact. This [...] Read more.
Avian malaria and leucocytozoonosis can cause fatal diseases, whereas avian trypanosomiasis is reported to be harmless in chickens. Backyard chickens can be infected by several pathogens, including blood parasites, that may shed to industrial poultry production, with a consequently higher economic impact. This study aimed to investigate the presence of several blood parasites (Plasmodium, Leucocytozoon and Trypanosoma) in backyard chickens raised in Southern Thailand, using PCR-based detection and microscopic methods. From June 2021 to June 2022, 57 backyard chickens were sampled. Fresh thin blood smears were prepared from 11 individuals, and buffy coat smears were prepared from 55 of them. Both thin blood smears and buffy coat smears were used for microscopic analysis. Two nested PCR protocols that amplify a fragment of cytochrome b (cytb) and small subunit rRNA (SSU rRNA) genes were used to identify Haemosporida and Trypanosoma parasites, respectively. The number of positive samples was higher with the application of nested PCR than when buffy coat smears were used. Three new Plasmodium lineages (GALLUS47-49) and thirteen Leucocytozoon lineages (GALLUS50-62) were found. Trophozoites, meronts and gametocytes of Plasmodium gallinaceum (GALLUS01) were present in one thin blood smear. All thin blood smears revealed Leucocytozoon infections, but only three samples were a single infection. These three samples revealed the presence of fusiform host cell–parasite complexes, of which the morphological features resembled those of Leucocytozoon macleani (possible synonym is Leucocytozoon sabrazesi), while the cytb showed that this parasite is closely related to the lineage GALLUS06-07, described as Leucocytozoon schouteni. The Trypanosoma prevalence was 33.33%; it was present in only one of the thin blood smears, and it resembles Trypanosoma calmettei. This study showed the prevalence of a high diversity of Plasmodium (64.91%) and Leucocytozoon (89.47%) in Thai chickens. Both nested-PCR and buffy coat smear can be used as the diagnostic tool for the testing of Plasmodium, Leucocytozoon and Trypanosoma for parasitic control in backyard chickens and poultry farms. The information on the parasite species that can be found in chickens raised in Southern Thailand was also considered as the baseline information for further study. Full article
(This article belongs to the Special Issue Avian Haemosporidian Parasites: Causes and Consequences of Infection)
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Review

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12 pages, 728 KiB  
Review
A Literature Review on the Role of the Invasive Aedes albopictus in the Transmission of Avian Malaria Parasites
by Jesús Veiga, Mario Garrido, Marta Garrigós, Carolina R. F. Chagas and Josué Martínez-de la Puente
Animals 2024, 14(14), 2019; https://doi.org/10.3390/ani14142019 - 9 Jul 2024
Cited by 1 | Viewed by 1398
Abstract
The Asian tiger mosquito (Aedes albopictus) is an invasive mosquito species with a global distribution. This species has populations established in most continents, being considered one of the 100 most dangerous invasive species. Invasions of mosquitoes such as Ae. albopictus could [...] Read more.
The Asian tiger mosquito (Aedes albopictus) is an invasive mosquito species with a global distribution. This species has populations established in most continents, being considered one of the 100 most dangerous invasive species. Invasions of mosquitoes such as Ae. albopictus could facilitate local transmission of pathogens, impacting the epidemiology of some mosquito-borne diseases. Aedes albopictus is a vector of several pathogens affecting humans, including viruses such as dengue virus, Zika virus and Chikungunya virus, as well as parasites such as Dirofilaria. However, information about its competence for the transmission of parasites affecting wildlife, such as avian malaria parasites, is limited. In this literature review, we aim to explore the current knowledge about the relationships between Ae. albopictus and avian Plasmodium to understand the role of this mosquito species in avian malaria transmission. The prevalence of avian Plasmodium in field-collected Ae. albopictus is generally low, although studies have been conducted in a small proportion of the affected countries. In addition, the competence of Ae. albopictus for the transmission of avian malaria parasites has been only proved for certain Plasmodium morphospecies under laboratory conditions. Therefore, Ae. albopictus may play a minor role in avian Plasmodium transmission in the wild, likely due to its mammal-biased blood-feeding pattern and its reduced competence for the development of different avian Plasmodium. However, further studies considering other avian Plasmodium species and lineages circulating under natural conditions should be carried out to properly assess the vectorial role of Ae. albopictus for the Plasmodium species naturally circulating in its distribution range. Full article
(This article belongs to the Special Issue Avian Haemosporidian Parasites: Causes and Consequences of Infection)
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