The prevalence, abundance and distribution of cyathostomins (small stongyles) in horses from Western Romania.

This study investigates the extent and diversity of small strongyles (a type of parasitic worm) infestations in 47 work horses in Western Romania. The study found that every horse was affected to varying degrees by these parasites, and further analysis classifies the impact on different organs and highlights the preference of certain species for specific locations within the host bodies.

Objective and Methodology

• This research targeted working horses in Western Romania, aiming to discover the pervasiveness, number, and variation of small strongyles (cyathostomins) infections. These parasites are a common occurrence in equines and can lead to serious health problems.
• The study involved conducting autopsies on 47 horses and examining the level of infestation, reflecting the burden and variety of the parasitic species present.

Results

• All the examined horses were found to be infected with cyathostomins. The intensity of the infestation varied significantly, ranging from 390 to 13,010, and each host was affected by 8-24 species of parasites.
• Within the digestive system, the ventral and dorsal colons had the highest levels of infestation, while the caecum (a pouch within the intestine) recorded the lowest parasite count.
• Twenty-four species were identified in total. Three species, namely Cyathostomum catinatum, Cylicocyclus insigne, and C. Nassatus, were found within all horses. Additionally, over half the horses had infections from Coronocyclus coronatus, Cylicostephanus calicatus, C. goldi, and C. longibursatus.
• Some species such as Coronocyclus labiatus, Parapoteriostomum mettami, Poteriostomum imparidentatum, and P. ratzii, were less prevalent.
• Most identified cyathostomins species displayed a significant preference for specific organs, indicating a niche preference for particular bodily locations.

Niche Breadth Analysis

• Some species displayed more diverse selection and did not restrict themselves to specific organs, demonstrating a broader ‘niche breadth’.
• The study found the niche breadth of ten species was noticeably impacted by their own intensity. Specifically, if there were large numbers of a particular parasite, it significantly influenced the variety of locations within the host where they could be found.
• Additionally, for Cylicocyclus nassatus, it was observed that the total intensity of other species had a positive effect on its niche breadth, while for Cylicocyclus elongatus the opposite was true.

Community Composition

• The study also conducted a cluster analysis, grouping together species based on the similarity of their preferred habitats within the host body.
• The primary cluster was composed of three dominant species, while the second most significant group was formed by Coronocyclus coronatus.
• Remaining species displayed a tree-like structure, suggesting the presence of variable and complex parasitic communities within the hosts.