Lice infestations of Steppe Buzzards (Buteo buteo vulpinus) markedly differ from those of Common Buzzards (Buteo buteo buteo)

Publication Type:Journal Article
Year of Publication:2019
Authors:R. Yosef, Strutzer, O., Tabibi, R., Rózsa, L.
Journal:Journal of Raptor Research
Pagination:7 pp
Type of Article:Short Communications
Keywords:Common Buzzard, infestation, lice, Migration, Steppe Buzzard

ABSTRACT.—The Steppe Buzzard (Buteo buteo vulpinus), an eastern subspecies of the Common Buzzard (Buteo buteo), is a long-distance migrant raptor that breeds across eastern European and central Asian grasslands. The eastern European populations migrate through a geographic bottleneck in Israel and overwinter in eastern and southern Africa. To investigate how the metabolic demand of long-distance migration may affect their health, we trapped Steppe Buzzards (n 1⁄4 28) at Eilat, Israel, during the spring migration of 2016 and 2017 and collected their parasitic lice (Insecta: Phthiraptera). We compared their lice infestation levels to published data on nonmigratory or short-distance migratory Common Buzzards (B. b. buteo). These Common Buzzards were divided into two groups, free-living birds (n 1⁄4 59) and captive ones (n 1⁄4 104). All the Steppe Buzzards we examined harbored 1–4 species of lice. The Amblyceran lice that feed partially on living tissues and are thought to be relatively more virulent (Laemobothrion maximum and Colpocephalum nanum) were significantly more prevalent on Steppe Buzzards than on Common Buzzards (either free-living or in captivity). In contrast, the less-harmful Ischnoceran lice (Craspedorrhynchus platystomus and Degeeriella fulva) were either similarly or less prevalent on Steppe Buzzards than on the nonmigratory Common Buzzards, either free-living or in captivity. We hypothesize that this difference may mirror the metabolic demands of long-distance migration or, alternatively, our Eilat sample of Steppe Buzzards might have been biased in favor of the heavily infested individuals. In the Steppe Buzzard sample, we also detected a formerly unknown negative correlation between the abundance of Laemobothrion maximum and Colpocephalum nanum.

RESUMEN.—Buteo buteo vulpinus, una subespecie oriental de B. buteo, es una rapaz migratoria de larga distancia que cr ́ıa en los pastizales del este de Europa y el centro de Asia. Las poblaciones del este de Europa migran a trave ́s de un cuello de botella geogra ́fico en Israel y pasan el invierno en el este y sur de ́frica. Para investigar como la demanda metabo ́lica de un migrante de larga distancia puede afectar la salud de esta especie atrapamos individuos de B. b. vulpinus (n 1⁄4 28) en Eilat, Israel, durante la migracio ́ n de primavera de los an ̃os 2016 y 2017 y recolectamos sus piojos (Insecta: Phthiraptera). Comparamos los niveles de infestacio ́n con piojos con datos publicados de individuos no migratorios o migrantes de corta distanciadeB.b.buteo.Losindividuosdeestau ́ltimasubespeciefuerondivididosendosgrupos,aveslibres (n 1⁄4 59) y aves cautivas (n 1⁄4 104). Todos los individuos de B. b. vulpinus que examinamos albergaron entre 1 y 4 especies de piojos. Los piojos del suborden Amblycera Laemobothrion maximum y Colpocephalum nanum, que se alimentan parcialmente de tejidos vivos y que se cree que son relativamente ma ́s virulentos, fueron significativamente ma ́s prevalentes en B. b. vulpinus que en B. b. buteo libres o en cautivos. Por el contario, los piojos menos dan ̃inos del suborden Ischnocera Craspedorrhynchus platystomus y Degeeriella fulva fueron igual o menos prevalentes en B. b. vulpinus que en los individuos no migratorios de B. b. buteo libres o cautivos. Hipotetizamos que esta diferencia puede reflejar las demandas metabo ́licas de la migracio ́n de larga distancia o, alternativamente, nuestra muestra de Eilat de B. b. vulpinus podr ́ıa haber estado sesgada en favor de individuos fuertemente infestados. En la muestra de B. b. vulpinus tambie ́n detectamos una correlacio ́n negativa previamente desconocida entre la abundancia de Laemobothrion maximum y la de Colpocephalum nanum.

File attachments: 
Thu, 2019-02-07 13:21 -- Yokb
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith