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1 February 2002 HEMATOLOGICAL PARAMETERS AND STRESS INDEX IN RUFOUS-COLLARED SPARROWS DWELLING IN URBAN ENVIRONMENTS
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Abstract

A number of wild bird species have fortuitously incorporated themselves into urban life. One of these, the Rufous-collared Sparrow (Zonotrichia capensis), dwells with seemingly similar success in urban and rural areas. Nevertheless, we found that urban Rufous-collared Sparrows have lower body weight, higher blood glucose concentration, higher proportion of heterophils (H), lower proportion of lymphocytes (L), and consequently, a larger H:L stress index, than rural ones. After two weeks of captivity rural birds developed blood characteristics that resembled those of urban birds. These indices reveal typical primary (acute), and secondary (chronic) stress characteristics in the urban birds.

Parámetros Hematológicos e Indice de Estrés en Zonotrichia capensis de Ambientes Urbanos

Resumen. Varias especies de aves han sido incorporadas a la vida urbana. Una de ellas, Zonotrichia capensis, habita con similar éxito tanto en ambientes urbanos como rurales. Sin embargo, hemos notado que individuos urbanos de Z. capensis tienen un peso corporal menor, mayores niveles de glucosa circulante, mayor proporción de heterófilos (H), menor proporción de linfocitos (L), y consecuentemente un mayor índice de estrés H:L que individuos rurales. Aves rurales mantenidos en cautiverio por dos semanas presentaron cambios hematológicos que concuerdan con las características de las aves urbanas. Estos índices revelan características de estrés primarias (agudas) y secundarias (crónicas) que son típicas en aves urbanas.

Gricelda Ruiz, Mario Rosenmann, Francisco Fernando Novoa, and Pablo Sabat "HEMATOLOGICAL PARAMETERS AND STRESS INDEX IN RUFOUS-COLLARED SPARROWS DWELLING IN URBAN ENVIRONMENTS," The Condor 104(1), (1 February 2002). https://doi.org/10.1650/0010-5422(2002)104[0162:HPASII]2.0.CO;2
Received: 6 February 2001; Accepted: 1 October 2001; Published: 1 February 2002
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