Multiple long-term, landscape-scale datasets reveal intraspecific spatial variation in temporal trends for bird species

Quantifying temporal changes in species occurrence has been a key part of ecology since its inception. We quantified multi-decadal site occupancy trajectories for 18 bird species in four independent long-term, large-scale studies (571 sites, ~ 1000 km latitude) in Australia. We found evidence of a year x long-term study interaction in the best-fitting models for 14 of the 18 species analysed, with differences in the temporal trajectories of the same species in multiple studies consistent with non-stationarity. Non-stationarity patterns in occupancy were not related to the distance from a species niche centroid; species in locations further from their niche centroid did not demonstrate differing temporal trajectories to those closer to their niche centroid. Further, temporal trajectories of species were not associated with climatic values for each study relative to their niche. Our findings demonstrate the need for multiple long-term studies across a species range, especially when tailor..., , , # Data and code for Lindenmayer et. al 2024, Multiple long-term, landscape-scale datasets reveal intraspecific spatial variation in temporal trends for bird species. Ecology Letters.

## Description

The data package contains several csv files, R code files, RData files

Data:

* 'All_data_combined.csv' contains the point count surveys for all data from the four studies in this paper.
* 'YearSite': the combined site code and year
* 'SiteCode': the unique identifier for the site
* 'SurveyYear': year of the survey
* 'RepeatNumber': the point count visit per year per site
* 'StudyDescription': the study in which the point count was located
* 'Treat': the main treatment for site
* 'Temperature' (scale 1-10) , 'WindId' (scale 1[calm]-4[windy]), 'CloudsId' (scale 1[clear]-6[completely overcast], 'ObserverId' (each number refers to an observer): the observation level predictors
* Following columns are binomial data of whether a given species is observed in that point count.
*...