Population and nesting habitat survey for Oreotrochilus chimborazo chimborazo

The adaptive significance of group-living has promoted considerable debate about the potential role of environmental drivers in the evolution of coloniality. Nest aggregations may result as a plastic response of reproductive individuals to limited substrate availability and favorable environmental conditions for nesting (Limited Substrate Availability Hypothesis). However, few studies have demonstrated the direct role of environmental factors in promoting social aggregations. A population survey of Oreotrochilus chimborazo chimborazo (Chimborazo Hillstar), a hummingbird subspecies endemic to the Ecuadorian High Andes, resulted in the identification of 7 nesting aggregations and 13 solitary nests. Of a total of 74 active nests detected, most (82%) were found in reproductive colonies. Furthermore, nesting aggregations were consistently associated year-round with roosting groups of males and non-reproductive females, a unique case among birds. These findings challenge the widespread assump..., , , # Population and nesting habitat survey for *Oreotrochilus chimborazo chimborazo*

[Access this dataset on Dryad](https://doi.org/10.5061/dryad.sn02v6xfj)
\- This dataset is associated with the following Dryad files: Dryad_Raw_Data.docx and README_Dryad.md

Dataset associated with Cañas-Valle and Bouzat (2024) publication in *Ornithology* (Vol 142: 1-13), entitled \"Ecological drivers of coloniality in *Oreotrochilus chimborazo chimborazo* (Chimborazo Hillstar), a hummingbird endemic to the High Andes of Ecuador.\"
See Materials and Methods section of Cañas-Valle and Bouzat (2024) for specific descriptions of methods used for the collection of the data reported here. [https://doi.org/10.1093/ornithology/ukae063](https://doi.org/10.1093/ornithology/ukae063)

## Descriptions

**Raw Data associated with the study published in** ***Ornithology*** **(2024)**

1. Population survey raw data
2. Nesting survey data
3. Nesting and roosting survey of colonial aggregations
4. Avian checklists
5. Char...,