Necrophagous flies assemblages: Spatio-temporal patterns in a Neotropical urban environment
Ensamble de moscas necrófagas: Patrones espaciales y temporales en un ambiente urbano neotropical
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https://doi.org/10.15446/caldasia.v40n2.67103Palabras clave:
Community, forensic entomology, necrophagous flies, urbanization (en)Comunidad, entomología forense, moscas necrófagas, urbanización (es)
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Species composition, richness, and relative abundance of the communities of Calliphoridae, Muscidae, and Fanniidae in Córdoba city, Argentina was assessed, and how these characteristics are affected by seasonal and anthropogenic conditions was studied. The study was carried out in thirteen sites with various levels of urbanization during 2014 and 2015, comparing two seasons: the warmer-wet summer and the cold-dry winter. Adult flies were collected in each site using two traps baited with hydrated bone meal. A total of 1683 flies were collected, belonging to twelve genera and 22 species. Several of the species collected are relevant to forensic sciences. The most frequent species were Hydrotaea aenescens (Muscidae) and Fannia fusconotata (Fanniidae). No differences in necrophagous fly richness or relative abundances between the central urban sites and the periphery suburban sites were observed; however, richness was significantly correlated with local (250 m buffer area) built-up density. Species composition differed between the urban and suburban sites. Seasonal differences were also detected: the relative abundances per species were more even in the summer. Dissimilarities in the assemblages were mainly due to differences in the relative abundances of some species, reflecting their adaptability to landscapes with different degree of urbanization. Regardless of season or urbanization density, species richness and effective number of species were higher in traps placed in the sun as opposed to shade. Taken together, these results suggest that in Córdoba city both landscape and local factors explain variations in the necrophagous fly community.
Se evaluó la composición, riqueza y abundancia relativa de especies de las comunidades de Calliphoridae, Muscidae y Fanniidae en la ciudad de Córdoba, Argentina, y se examinó cómo estas características son afectadas por las condiciones estacionales y antropogénicas. El estudio se llevó a cabo durante 2014 y 2015 en trece sitios con diferentes niveles de urbanización, comparando las estaciones de verano cálido-húmedo e invierno frío-seco. Se recolectaron moscas adultas en cada sitio utilizando dos trampas cebadas con harina de hueso hidratada. Se recogieron 1683 moscas, pertenecientes a doce géneros y 22 especies. Varias de las especies recolectadas son relevantes en las ciencias forenses. Las especies más frecuentes fueron Hydrotaea aenescens (Muscidae) y Fannia fusconotata (Fanniidae). No se observaron diferencias en la riqueza ni en las abundancias relativas entre los sitios urbanos centrales y los sitios suburbanos periféricos; sin embargo, la riqueza se correlacionó con la densidad de construcción local (250 m de área buffer). La composición por especies difirió entre los sitios urbanos y suburbanos. Las abundancias relativas por especie fueron más uniformes en verano. Las disparidades en los ensambles se debieron principalmente a las diferencias en las abundancias relativas de algunas especies, lo que refleja su adaptabilidad a paisajes con diferente urbanización. Independientemente de la estación del año o de la densidad de urbanización, la riqueza de especies y el número efectivo de especies fueron mayores en las trampas al sol que a la sombra. Estos resultados sugieren que en la ciudad de Córdoba tanto el paisaje como los factores locales explican las variaciones en la comunidad de moscas necrófagas.
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