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This paper presents a brief overview and history of “phenoclimatology”, a subdiscipline of climatology, emphasizing atmosphere-biosphere interactions. Here, we describe the establishment and recent growth in models and forecasts created using in situ phenology observations and the factors enabling these advancements, with focus on North America. Most notably, large-scale phenological models paved the way for development of synthetic indices. Such indices can supply an assessment of a location’s general phenological response over a standard period, context for comparing regional or local-scale studies, the ability to analyze changes in damage risks for plants, and reconstruction of the timing of events in years past across many regions. As such, synthetic phenological indices have seen wide adoption in estimating spring-season evolution in real time, anticipating short-term impacts of an early or late start to spring, and in assessing changes in the timing of seasonal transitions associated with climate change.more » « less
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Abstract The number and diversity of phenological studies has increased rapidly in recent years. Innovative experiments, field studies, citizen science projects, and analyses of newly available historical data are contributing insights that advance our understanding of ecological and evolutionary responses to the environment, particularly climate change. However, many phenological data sets have peculiarities that are not immediately obvious and can lead to mistakes in analyses and interpretation of results. This paper aims to help researchers, especially those new to the field of phenology, understand challenges and practices that are crucial for effective studies. For example, researchers may fail to account for sampling biases in phenological data, struggle to choose or design a volunteer data collection strategy that adequately fits their project’s needs, or combine data sets in inappropriate ways. We describe ten best practices for designing studies of plant and animal phenology, evaluating data quality, and analyzing data. Practices include accounting for common biases in data, using effective citizen or community science methods, and employing appropriate data when investigating phenological mismatches. We present these best practices to help researchers entering the field take full advantage of the wealth of available data and approaches to advance our understanding of phenology and its implications for ecology.more » « less