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THE WILSON JOURNAL OF ORNITHOLOGY • Vol. 123. No. 4. December 2011 
Months 
Months 
FK3 1. Monthly average captures (standardized by 1,000 net hrs) of Flammuiated Flycatchers (Deltarynchus 
flammulatus) and precipitation at the Chamela Biological Station. 1999-2001. 2005-2010. Error bars represent 1 SD; 
numbers above bars represent total net hrs sampled by month. 
Each captured bird was banded with a num¬ 
bered aluminum band and processed for body 
mass (0.1 g with a 50 g electronic scale), exposed 
culmen and tarsus lengths (0.05 mm using dial 
calipers), and unflattened wing cord length 
(0.5 mm using a flat-ended 15-cm ruler). Birds 
were classified as male or female only if they 
were in ‘breeding condition’ (presence of a 
cloacal protuberance or brood patch). Age was 
evaluated by the presence of unpneumaticized 
areas in the skull. 
RESULTS 
Phenology .—We captured 135 Flammulatec 
Flycatchers (first captures only). Eight were 
hatching year <HY) and 127 were after hatching 
year (AHY); 11 were males. 27 were females, anc 
89 were of unknown gender. Morphologica 
measurements (mean ± SD) of adult Flammu- 
lated Flycatchers (n = 29) were: wing chord (71 ( 
;*?!■ tarSUS (I8J ± 073 cm), culmen 
(tu .2 _ 0.41 cm), and mass (17.2 ± 0.86 g) We 
n0t Jr 1 * ender dances in these metrics 
(Mann-Whitney U, P > 0.05). 
Monthly averages of captures differed between 
seasons with a peak (71%) during May to August 
(end ol dry season to middle of wet season) and 
fewer (29%) captures during the rest of the year 
(Fig. 1). Flammuiated Flycatchers in breeding 
condition (n = 38) were captured only in June 
and July. HYs {n = 8) were captured from 10 July 
through 11 December. 
Habitat Use .—Comparable numbers of indi¬ 
viduals were captured in deciduous forest (n = 
59) and semi-deciduous forest (n = 48) based 
on analysis of data from 1999 and 2000 when 
we applied equal effort between habitats. There 
was an interaction among forest type and season 
(X 2 = 9.2, df = 1, P = 0.002). Proportionately 
more birds were captured in deciduous forest 
during the wet season (1:0.55), whereas this 
relationship reversed during the dry season 
(0.47:1). 
Recaptures .—We recaptured 13 birds; all were 
captured for the first time during the breeding 
season and recaptured at the same site during the 
following breeding season (n = 12) or two 
breeding seasons apart (n = 1). 
