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<p>Colonial herons and egrets breed within highly heterogeneous landscapes where environmental conditions vary across multiple spatial scales. Although landscape structure is expected to shape colony-level species assemblages, explicit multi-scale empirical assessments remain scarce, particularly at national extents. We sought to (1) identify emergent species-assemblage types among heron and egret colonies across South Korea, (2) determine how these assemblages correspond to landscape heterogeneity across nested spatial scales, and (3) quantify the scale-dependent importance of environmental predictors influencing colony identity. We compiled species-specific nest counts from 176 breeding colonies and applied Self-Organizing Maps (SOM) to classify colony assemblages. Landscape variables were extracted from ESA CCI Plant Functional Type (PFT) datasets within five buffer radii: 500&#xa0;m, 1&#xa0;km, 3&#xa0;km, 5&#xa0;km, and 10&#xa0;km. The relative importance of land-cover predictors at each spatial scale was evaluated using Random Forest models. SOM analysis revealed six ecologically distinct colony groups differing in species dominance, richness, and geographic distribution. Large-bodied species predominated in inland forested regions, whereas medium- and small-bodied species clustered in coastal and urban–rural mosaics. Environmental predictors showed scale-dependent patterns: built areas, managed herbaceous vegetation, and water-related cover dominated at fine scales; natural grasslands, bare land, and tree-related PFTs emerged at intermediate scales; and broader land-use variables remained important at 10&#xa0;km. Colony assemblages arise from hierarchical interactions among fine-scale habitat features, river-corridor landscapes, and broader-scale land-use regimes. This hierarchical multi-scale perspective provides a landscape-ecological framework for anticipating how land-use change may alter the multi-scale landscape contexts supporting colonial wading birds. </p>

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Multi-scale environmental drivers of heron and egret colony assemblages in Korea using self-organizing map clustering

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月17日

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  • SeonYong Lee,
  • Han-I Choi,
  • Jae-Woong Hwang,
  • Ji-Yeon Lee,
  • Dong-Won Kim,
  • Yu-Seong Choi,
  • Hyung-Kyu Nam

摘要

Colonial herons and egrets breed within highly heterogeneous landscapes where environmental conditions vary across multiple spatial scales. Although landscape structure is expected to shape colony-level species assemblages, explicit multi-scale empirical assessments remain scarce, particularly at national extents. We sought to (1) identify emergent species-assemblage types among heron and egret colonies across South Korea, (2) determine how these assemblages correspond to landscape heterogeneity across nested spatial scales, and (3) quantify the scale-dependent importance of environmental predictors influencing colony identity. We compiled species-specific nest counts from 176 breeding colonies and applied Self-Organizing Maps (SOM) to classify colony assemblages. Landscape variables were extracted from ESA CCI Plant Functional Type (PFT) datasets within five buffer radii: 500 m, 1 km, 3 km, 5 km, and 10 km. The relative importance of land-cover predictors at each spatial scale was evaluated using Random Forest models. SOM analysis revealed six ecologically distinct colony groups differing in species dominance, richness, and geographic distribution. Large-bodied species predominated in inland forested regions, whereas medium- and small-bodied species clustered in coastal and urban–rural mosaics. Environmental predictors showed scale-dependent patterns: built areas, managed herbaceous vegetation, and water-related cover dominated at fine scales; natural grasslands, bare land, and tree-related PFTs emerged at intermediate scales; and broader land-use variables remained important at 10 km. Colony assemblages arise from hierarchical interactions among fine-scale habitat features, river-corridor landscapes, and broader-scale land-use regimes. This hierarchical multi-scale perspective provides a landscape-ecological framework for anticipating how land-use change may alter the multi-scale landscape contexts supporting colonial wading birds.