Time filter

Source Type

Sanchez J.E.,Asociacion de Ornitologos Unidos de Costa Rica | Zook J.R.,Apartado 182 4200 | Carman E.,Apartado 56 7100 | Sandoval L.,University of Windsor
Check List | Year: 2014

We present information about the relative abundance and occurrence of the Redhead (Aythya americana), and the Ruddy Duck (Oxyura jamaicensis) in Costa Rica. The observations were conducted during the winter seasons of 2010 to 2011, 2011 to 2012, and 2012 to 2013 at different wetlands across the country. These sightings represent the southernmost records for each species. What caused these birds to such southern latitudes is unknown, because the regular wintering areas of those species occur in northern Central America or Mexico. © 2014 Check List and Authors.

Aguilar S.,University of Costa Rica | Sanchez J.E.,Asociacion de Ornitologos Unidos de Costa Rica | Martinez D.,Asociacion de Ornitologos Unidos de Costa Rica
Check List | Year: 2013

We present the first record of the Clay-colored Sparrow (Spizella pallida) in Costa Rica. An adult bird was recorded ca. 900 Km south of its common wintering range. This represents the first record of the species for the country and for southern Central America. © 2013 Check List and Authors.

Sanchez J.E.,Asociacion de Ornitologos Unidos de Costa Rica | Conejo-barboza K.,University of Costa Rica | Sanchez C.,Louisiana State University | Calderon-Franco D.,Colombia Birding | Sandoval L.,University of Costa Rica
Ornitologia Neotropical | Year: 2016

The breeding biology of the genus Discosura (Trochilidae) is poorly known. Here, we describe in detail the nest and eggs of the Green Thorntail (D. conversii). We analyze two nests; one was collected with two eggs at Limón province, Costa Rica, the other was observed and photographed at Departamento de Antioquia, Colombia. The eggs are white and oval-shaped. Both nests are deep and compact open cups, however, the nest from Colombia is externally covered with green-colored lichens while this feature is not present in the nest collected in Costa Rica. We recommend reporting more data from other nests and eggs of this species to determine possible causes for intraspecific variation.

Sandoval L.,University of Costa Rica | Sanchez C.,Louisiana State University | Biamonte E.,University of Costa Rica | Zook J.R.,Apartado 182 4200 | And 4 more authors.
Bulletin of the British Ornithologists' Club | Year: 2010

Department of Biological Sciences & Museum of Natural Science,. We report new data on distribution, colonisation and breeding of 17 species recently recorded in Costa Rica for the first time, such as Greater Shearwater Puffimis gravis and Savanna Hawk Bnteogallus meridionalis, as well as information for nine other species with few previous records in Costa Rica, e.g. Green-winged Teal Anas crecca, Ocellated Poorwill Nyctiphrynus ocellatus and Chipping Sparrow Spizella passerina. The majority of new records involve species that have expanded their range north from Panama (11 species), due principally to deforestation. © British Ornithologists' Club 2010.

Greeney H.F.,Yanayacu Biological Station and Center for Creative Studies | Sanchez C.,Louisiana State University | Sanchez J.E.,Asociacion de Ornitologos Unidos de Costa Rica | Carman E.,Asociacion de Ornitologos Unidos de Costa Rica
Journal of Ornithology | Year: 2013

We review published information on the nests and eggs of members of the polyphyletic genus of antbirds, Myrmeciza, and present the first descriptions of nests and eggs of the Dull-mantled Antbird M. laemosticta, based on three nests found in Costa Rica. We identify three distinct nest architectures within the group: bulky, bottom-supported, open cups of coarse vegetative matter; rim-suspended open cups of neatly woven fine materials; and bulky domed nests made of coarse vegetative materials. The majority of described nests (eight) belong to the first category, but the nests of M. atrothorax and M. hemimelaena have unique architectural characters which may prove to be phylogenetically informative. The nests of M. laemosticta are rim-suspended, open cups made of fibers, similar to those of M. palliata and M. hyperythra. As molecular data suggest that M. hyperythra is more closely related to Schistocichla than to M. laemosticta and M. palliata, these likely represent independent derivations of the rim-suspended architecture. M. melanoceps, M. goeldii, and M. fortis belong to the third architectural group, united by the construction of domed nests similar to hypothesized relatives. We conclude that nest architecture is phylogenetically informative within this group and supports molecular-based hypotheses. However, more nest descriptions are needed for all species, in particular M. longipes, M. berlepschi, M. pelzelni, and M. disjuncta; and future descriptions should include architectural details such as the manner in which nests are supported by or attached to their substrate. © 2013 The Author(s).

Loading Asociacion de Ornitologos Unidos de Costa Rica collaborators
Loading Asociacion de Ornitologos Unidos de Costa Rica collaborators