Abstract
Our study provides information on the breeding and biometrics of Rusty-Margined Flycatcher Myiozetetes cayanensis in southwest Brazilian Amazonia. Myiozetetes cayanensis is distributed from Central America until north of South America. We made observations on reproduction and captures of this species in a terra firme forest fragment in the state of Acre, between 1999 and 2020 and we evaluated the breeding season in Brazil through citizen science data. We monitored nine nests between 2012 and 2020, built at a mean height of 1.8 m above ground. Clutch size was two, three or four eggs, incubated for 15 days. We monitored the development of six nestlings: minimum hatch weight was 2 g and young fledged with a mean mass of ca. 25.5 g. The constant growth rate (K) of nestlings was 0.18 with a growth asymptote of 22.8 g. Daily survival rate was 90% and 100% during the incubation and nestling periods, respectively. The Mayfield success in the incubation and nestling periods was 20 and 100%, respectively. Apparent nesting success in the incubation and nestling periods was 46 and 100%, respectively. We recorded a minimum longevity of 2 years, nine months and 26 days. The subspecies M. c. cayanensis start to nest mainly between the dry and rainy season in Brazil, overlapping with the molt period in southwest Amazonia.
Highlights
Contributions to the conservation of bird species are possible with studies of the reproductive biology which reveal important data that can aid understanding of ecological relationships (Martin 2004) between biotic and abiotic factors
Few data are available on the reproductive biology of M. cayanensis (Carvalho 1960, Oniki & Willis 1983, Dyrcz 1991, Pascoal et al 2016), and most of the studies have been conducted in countries other than Brazil (Mobley & Kirwan 2020)
The eastern extreme of the Brazilian state of Acre and adjacent areas of the lowlands of southeastern Peru and northeastern Bolivia represent the limit of the distribution of M. cayanensis in southwestern Amazonia (Schulenberg et al 2010, Guilherme 2016, Mobley & Kirwan 2020)
Summary
Contributions to the conservation of bird species are possible with studies of the reproductive biology which reveal important data that can aid understanding of ecological relationships (Martin 2004) between biotic and abiotic factors. Rusty-Margined Flycatcher ranges from Costa Rica and Panama to northern South America (Mobley & Kirwan 2020). This species is usually one of the most common flycatchers in the regions of Brazil in which it occurs (Sick 1997). Few data are available on the reproductive biology of M. cayanensis (Carvalho 1960, Oniki & Willis 1983, Dyrcz 1991, Pascoal et al 2016), and most of the studies have been conducted in countries other than Brazil (Mobley & Kirwan 2020). We obtained detailed data on the reproductive biology and biometrics of M. c. cayanensis from a lowland terra firme forest in southwest Brazilian Amazonia, including its breeding season in Brazil, which provide important insights into the life history patterns of the flycatchers
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