Plant–plant co-occurrences under a complex land-use gradient in a temperate forest

被引:0
|
作者
Verónica Chillo
Diego P. Vázquez
Julia Tavella
Luciano Cagnolo
机构
[1] Universidad Nacional de Río Negro,Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
[2] Instituto de Investigaciones en Recursos Naturales,Facultad de Ciencias Exactas y Naturales
[3] Agroecología y Desarrollo Rural (IRNAD),Cátedra de Botánica General, Facultad de Agronomía
[4] IRNAD,undefined
[5] Instituto Argentino de Investigaciones de Zonas Áridas,undefined
[6] CONICET and Universidad Nacional de Cuyo,undefined
[7] Universidad Nacional de Cuyo,undefined
[8] Universidad de Buenos Aires,undefined
[9] Instituto Multidisciplinario de Biología Vegetal,undefined
[10] Universidad Nacional de Córdoba and CONICET,undefined
来源
Oecologia | 2021年 / 196卷
关键词
Centralization; Functional traits; Modularity; Patagonia; Stress gradient hypothesis;
D O I
暂无
中图分类号
学科分类号
摘要
Land-use generates multiple stress factors, and we need to understand their effects on plant–plant interactions to predict the consequences of land-use intensification. The stress–gradient hypothesis predicts that the relative strength of positive and negative interactions changes inversely under increasing environmental stress. However, the outcome of interactions also depends on stress factor’s complexity, the scale of analysis, and the role of functional traits in structuring the community. We evaluated plant–plant co-occurrences in a temperate forest, aiming to identify changes in pairwise and network metrics under increasing silvopastoral use intensity. Proportionally, positive co-occurrences were more frequent under high than low use, while negative co-occurrences were more frequent under low than high. Networks of negative co-occurrences showed higher centralization under low use, while networks of positive co-occurrences showed lower modularity and higher centralization under high use. We found a partial relationship between co-occurrences and key functional traits expected to mediate facilitation and competition processes. Our results shows that the stress-gradient hypothesis predicts changes in spatial co-occurrences even when two stress factors interact in a complex way. Networks of negative co-occurrences showed a hierarchical effect of dominant species under low use intensity. But positive co-occurrence network structure partially presented the characteristics expected if the facilitation was an important mechanism characterizing the community under high disturbance intensity. The partial relationship between functional traits and co-occurrences may indicate that other factors besides biotic interactions may be structuring the observed negative spatial associations in temperate Patagonian forests.
引用
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页码:815 / 824
页数:9
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