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<p>Host relatedness has been hypothesized to cause similarities in parasite assemblages and prevalence; we investigate this hypothesis in the ecologically diverse Caucasus Mountain region. Three <i>Phylloscopus</i> species sampled between 1998 and 2014 were analyzed to determine infection rates and to investigate whether <i>P. collybita</i> had low infection rates when compared to two congeners (<i>P. nitidus</i> and <i>P. sindianus</i>), as has been suggested. Generalized linear models were utilized to determine whether any differences in infection rates were related to environmental differences among sampling locations. <i>Phylloscopus collybita</i> and <i>P. nitidus</i> had comparable infection rates across and within haemosporidian genera; however, <i>P. sindianus</i> had distinctly lower infection rates. Models indicated that these infection differences were the result of differences between avian host species, rather than being influenced by other factors (e.g., host characteristics or environment). Results suggest that the host-relatedness hypothesis does not apply to here. Low haemosporidian infections rates of <i>P. sindianus</i> could be attributed to a higher elevational distribution, which may reduce contact with vector populations. One novel lineage was recovered from a <i>P. nitidus</i> individual in Armenia. This novel <i>Haemoproteus</i> lineage is similar in haplotype to another previously identified lineage found infecting <i>P. trochiloides</i> in India.</p>

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Haemosporidian infections in three sympatric Phylloscopus species: does host or environment determine parasite prevalence?

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月17日

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  • Ryan M. Weesner,
  • Serguei V. Drovetski,
  • Sargis A. Aghayan,
  • Gary Voelker

摘要

Host relatedness has been hypothesized to cause similarities in parasite assemblages and prevalence; we investigate this hypothesis in the ecologically diverse Caucasus Mountain region. Three Phylloscopus species sampled between 1998 and 2014 were analyzed to determine infection rates and to investigate whether P. collybita had low infection rates when compared to two congeners (P. nitidus and P. sindianus), as has been suggested. Generalized linear models were utilized to determine whether any differences in infection rates were related to environmental differences among sampling locations. Phylloscopus collybita and P. nitidus had comparable infection rates across and within haemosporidian genera; however, P. sindianus had distinctly lower infection rates. Models indicated that these infection differences were the result of differences between avian host species, rather than being influenced by other factors (e.g., host characteristics or environment). Results suggest that the host-relatedness hypothesis does not apply to here. Low haemosporidian infections rates of P. sindianus could be attributed to a higher elevational distribution, which may reduce contact with vector populations. One novel lineage was recovered from a P. nitidus individual in Armenia. This novel Haemoproteus lineage is similar in haplotype to another previously identified lineage found infecting P. trochiloides in India.