Global study reveals latitudinal diversity patterns of mixed-species bird flocks linked to environmental factors
image: The objective of this study is to quantify the α and β diversity of mixed-species bird flocks on a global scale and explore the influence of environmental factors. Quantifiable data on their global diversity patterns are provided, and it is suggested that future animal conservation management strategies should prioritize a community-based approach focused on interspecific interactions.
Credit: Jiahao Wu, Eben Goodale, Weiye Li, Fasheng Zou, and Qiang Zhang
Date: April 20, 2026
Guangzhou, China: A new collaborative study led by researchers from the Institute of Zoology, Guangdong Academy of Sciences and Xi’an Jiaotong-Liverpool University has mapped the global diversity patterns of mixed-species bird flocks (MSBFs) and their relationships with environmental and anthropogenic factors, offering data-driven insights for conservation strategies centered on interspecific interactions.
Research Overview: Data Synthesis and Key Metrics
Published in Biological Diversity, the research synthesizes data from 172 global publications, covering 2,095 bird species participating in MSBFs—nearly one-fifth of the world’s total bird species. The team analyzed α diversity (local species richness) and β diversity (community compositional variation) across latitudinal gradients and continents, alongside climate, vegetation, and human disturbance metrics.
Key Findings: Latitudinal Gradients and Community Patterns
Key findings show that MSBF species diversity peaks at low latitudes and declines toward higher latitudes, consistent with the classic latitudinal diversity gradient. Globally, β diversity is extremely high (βsor = 0.91) and dominated by species turnover, while high-latitude regions exhibit nestedness, meaning species-poor flocks are subsets of more diverse communities.
Drivers of Diversity: Environmental Impacts and Continental Trends
Environmental factors strongly shape these patterns: temperature and solar radiation boost MSBF diversity, whereas high wind speed and human disturbance exert significant negative effects. Geographical distance is the primary driver of β diversity variation globally. Continentally, South America supports the highest MSBF diversity, while Europe shows the lowest; Africa and Europe deviate slightly from the general latitudinal trend due to regional climate and connectivity.
Conservation Implications: Safeguarding Interspecific Interactions
The study highlights that MSBFs—mostly forest-dependent, insectivorous passerines—are sensitive to habitat change and human pressure. The authors emphasize that conservation plans should move beyond single-species protection to safeguard interspecific interactions and community structures, such as preserving mid-successional forests that support cohesive MSBF networks.
With 150 MSBF-participating species listed as threatened on the IUCN Red List, protecting these flocks represents a holistic, system-level approach to conserving biodiversity under global change.
Original Source
Wu, Jiahao, Eben Goodale, Weiye Li, Fasheng Zou, and Qiang Zhang. 2024. “Patterns in the global diversity of mixed-species bird flocks in relation to environmental factors.” Biological Diversity 1(2): 44–53.
https://onlinelibrary.wiley.com/doi/10.1002/bod2.12014
Keywords
anthropogenic disturbance, bird communities, grouping behavior, latitudinal gradients, social networks
About the Author
Jiahao Wu (First Author), PhD candidate, received his master’s degree from the South China Botanical Garden, Chinese Academy of Sciences, and is currently pursuing his doctoral degree at Xi’an Jiaotong-Liverpool University. His research focuses on ecology and ornithology.
Qiang Zhang (Corresponding Author), PhD, Deputy Director and Research Professor at the Institute of Zoology, Guangdong Academy of Sciences. His research focuses on avian diversity, interspecific social organization, plant-animal networks, and functional ecology.
About the Journal
Biological Diversity (ISSN: 2994-4139) is a new open-access, high-impact, English-language journal, devoted to advancing biodiversity conservation, enhancing ecosystem services, and promoting the sustainable use of resources under global change. It features innovative research addressing the global biodiversity crisis.