Abstract
Seasonal life history events are often interdependent, but we know relatively little about how the relationship between different events is influenced by the abiotic and biotic environment. Such knowledge is important for predicting the immediate and evolutionary phenological response of populations to changing conditions. We manipulated germination timing and shade in a multi-factorial experiment to investigate the relationship between spring and autumn phenology in seedlings of the pedunculate oak, Quercus robur, and whether this relationship was mediated by natural colonization of leaves by specialist fungal pathogens (i.e., the oak powdery mildew complex). Each week delay in germination corresponded to about 2 days delay in autumn leaf senescence, and heavily shaded seedlings senesced 5–8 days later than seedlings in light shade or full sun. Within seedlings, leaves on primary-growth shoots senesced later than those on secondary-growth shoots in some treatments. Path analyses demonstrated that germination timing and shade affected autumn phenology both directly and indirectly via pathogen load, though the specific pattern differed among and within seedlings. Pathogen load increased with later germination and greater shade. Greater pathogen load was in turn associated with later senescence for seedlings, but with earlier senescence for individual leaves. Our findings show that relationships between seasonal events can be partly mediated by the biotic environment and suggest that these relationships may differ between the plant and leaf level. The influence of biotic interactions on phenological correlations across scales has implications for understanding phenotypic variation in phenology and for predicting how populations will respond to climatic perturbation.
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This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant no. 1449440 and an international travel allowance through the Graduate Research Opportunities Worldwide (GROW) to JM.
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This material is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant no. 1449440 and an international travel allowance through the Graduate Research Opportunities Worldwide (GROW) to JM.
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JM, JE and AJMT designed the research, RM and LJAvD set up the field experiment, and JM collected and analyzed data. All the authors contributed to writing the manuscript.
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Mutz, J., McClory, R., van Dijk, L.J.A. et al. Pathogen infection influences the relationship between spring and autumn phenology at the seedling and leaf level. Oecologia 197, 447–457 (2021). https://doi.org/10.1007/s00442-021-05044-0
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DOI: https://doi.org/10.1007/s00442-021-05044-0