Reproductive success of three parid species in managed boreal forests

Anthropogenic impacts, such as forestry and land use practices, can deteriorate habitat quality, affecting reproductive success and leading to population decline. The boreal willow tit (Poecile montanus) population has dramatically declined in Finland. In contrast, great tits (Parus major) and blue tits (Cyanistes caeruleus), both of temperate origin, have expanded their ranges and increased in numbers in Northern Finland. It has been suggested that the decline in the willow tit population is mainly caused by the reduction of breeding sites and wintering areas resulting from habitat loss and degradation. We investigated whether forest management influences the reproductive success of willow tits, great tits, and blue tits, including recruitment across years, while considering other factors such as possible intra- and interspecific competition. We combined long-term breeding data (1990-2020) from Oulu, Finland, with spatial data on forest management activities and analysed the data using..., , # Reproductive success of three parid species in managed boreal forests

Dataset DOI: [10.5061/dryad.9ghx3ffz4](https://doi.org/10.5061/dryad.9ghx3ffz4)

## Description of the data and file structure

This repository includes the data and R scripts required for analysing and creating figures presented in the original research article, \"Reproductive success of three parid species in managed boreal forests.\"

All CSV files (=the data) were generated with similar column names in English (Table 1). They are the variables also used in the analysis. See the original research article for further explanation of the methods and more detailed variable descriptions.

Table 1. Explanations of the data column names in files BT_data.csv, GT_data.csv, and WT_data.csv.

| Column name | Explanation | Unit |
| :------------------------------------------------------------------------------------------...,