Effects of the parasitic flies of the genus Philornis (Diptera:Muscidae)on Pitangus sulphuratus (Tyrannidae) in the State of Rio de Janeiro
ABSTRACT. Luz H.R., Ferreira I. & Moya-Borja G.E. [Effects of the parasitic flies of the genus Philornis (Diptera:Muscidae)on Pitangus sulphuratus (Tyrannidae) in the State of Rio de Janeiro.] Efeitos das moscas parasitas do gênero Philornis (Diptera: Muscidae) em Pitangus sulphuratus (Tyrannidae) no estado do Rio de Janeiro. Revista Brasileira de Medicina Veterinária, 35(Supl.2):136-140, 2013. Curso de Pós-Graduação em Ciências Veterinárias, Instituto de Veterinária, Anexo 1, Universidade Federal Rural do Rio de Janeiro, Campus Seropédica, BR 465 Km 7, Seropédica, RJ 23897-970, Brasil. E-mail: firstname.lastname@example.org Over the past decades larvae Philornis sp. has been causing enormous damage to birds in South and Central America. In some regions, as the Galapagos Island, these ectoparasites are being incriminated as a major cause of the decline of wild bird populations. In this study, we report the effects of parasitism on nestlings of the species Pitangus sulphuratus in the state of Rio de Janeiro. Were studied eight nests of P. sulphuratus totalizing 20 nestlings, of these 12 (60%) had parasites. Half of nestlings (n = 6/50%) died in the first days of life. These were highly parasitized by larvae between days 0 and 3 of life when compared with nestlings survivors [9±1.7 (12-7)]. The statistical analyzes showed differences in total length between parasitized and non-parasitized nestlings (p≤0.001), parasitized nestlings presented slow growing, with smaller sizes, when compared with the development of non-parasitized nestlings. We also observed a difference in the mass gain between parasitized [23g ±15 (52-4)] and non-parasitized [39g ±25 (76-4)]. Individuals parasitized showed a gain of mass slower when compared to non-infected individuals (t = 41791; p ≤ 0.0001). According to these results we can say that birds infested by larvae of the genus Philornis. have a delay in his development (body weight and total length), especially when there is a high degree of parasitism.