The magnitude of Allee effects varies across Allee mechanisms, but not taxonomic groups

The Allee effect is a density-dependent phenomenon in which individual fitness increases as population density increases at low population densities. Over the past few decades, a growing number of studies have identified Allee effects in populations using experimental approaches and statistical modelling techniques. These studies have investigated multiple Allee mechanisms (e.g., mate-finding, predation, resource limitation), across a range of systems and taxa (e.g., plants, vertebrates, invertebrates). This meta-analysis aims to synthesize studies that experimentally manipulated population density and measured either per capita population growth or fitness components, with the goal of determining whether the “magnitude” of the Allee effect (defined here as the correlation between population density and population growth or fitness) varies with Allee mechanism across taxonomic groups. A total of 2305 studies were screened, and 62 of these studies met our meta-analysis inclusion criteria..., Studies were screened to determine if they met the meta-analysis inclusion criteria (an experimental manipulation of population density). Data for these studies was obtained from supplementary material or from online repositories, or it was extracted from the candidate studies either directly (from text, tables etc.) or by reverse engineering figures using Engauge Digitize software., , Eva J. Muir, Marc J. Lajeunesse, Andrew, M. Kramer

\---------------------------------------

Data for: The magnitude of Allee effects varies across Allee mechanisms, but not taxonomic groups

\---------------------------------------

File list

Scripts

\=====================

Allee_effect_meta_analysis_code.R

Data

\=====================

Allee_effect_meta_analysis_effect_size.csv

Allee_effect_meta_analysis_literature.csv

Allee_effect_meta_analysis_raw_data.xslx

\---------------------------------------

Description

Scripts

\=====================

Allee_effect_meta_analysis_code_mechanism.R – R file to run the meta-analysis models for Allee mechanism, taxa, and Allee effect type. Creates a forest plot of effect sizes (Figure 2).

Data

\=====================

Allee_effect_meta_analysis_effect_size.csv – a csv file containing the information for each study to run the meta-analysis models.

\- SEARCH_ID: Serach ID (r...