Frequency of bird species observations across survey grids in the Hawaiian islands. This dataset contains presence/frequency data for 183 bird species across 1,183 spatial grid cells, along with metadata about survey locations and species characteristics.
Format
A dgCMatrix sparse matrix (183 x 1,183) with bird species
frequency observations. Rows are bird species and columns are survey grid cells.
Metadata is stored as attributes.
Access metadata via:
attr(hawaiibirds, "metadata_h")- Survey grid information (1,183 rows):- grid
Character vector of grid cell identifiers
- island
Factor indicating which Hawaiian island
- lat
Numeric latitude coordinate
- lng
Numeric longitude coordinate
attr(hawaiibirds, "metadata_w")- Species information (183 rows):- species
Character vector of species common names
- status
Factor: "introduced" or "native"
- type
Factor indicating bird type (e.g., "birds of prey", "seabirds")
Details
This dataset contains bird observation data from the Hawaiian Islands, useful for ecological and biogeographic studies. The data is sparse, with many grid cells containing no observations for most species.
Bird types include:
Birds of prey
Coastal and wetland birds
Land birds
Seabirds
Waterbirds
Examples
# \donttest{
# Load dataset
data(hawaiibirds)
# Inspect structure
dim(hawaiibirds)
#> [1] 183 1183
table(attr(hawaiibirds, "metadata_w")$status)
#>
#> introduced native
#> 40 143
table(attr(hawaiibirds, "metadata_h")$island)
#>
#> Hawaii Kahoolawe Kauai Lanai Maui Molokai Oahu Puuwai
#> 593 4 183 5 148 19 229 2
# Run NMF to identify species co-occurrence patterns
result <- nmf(hawaiibirds, k = 10, maxit = 50)
# }