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Theresa Crimmins

Purpose This provisional Biogeographic Analysis Package provides a comparison between the annual Spring Indices First Leaf and First Bloom within the user-selected area of interest. Change in the timing of seasonal biological events (phenology – e.g., leaf-out, migration, and reproduction) is one of the most proximate responses to climate change. Information on phenological changes supports managers in adjusting the timing of activities such as treating invasive species, operating visitor facilities, and scheduling climate-related events (e.g., flower festivals, autumn leaf-viewing). Recent work shows that 53% of natural resource parks managed by the United States National Park Service are experiencing extremely...
Purpose This provisional Biogeographic Analysis Package provides an analysis of an annual Spring Index, First Bloom, within the user-selected area of interest. Change in the timing of seasonal biological events (phenology – e.g., leaf-out, migration, and reproduction) is one of the most proximate responses to climate change. Information on phenological changes supports managers in adjusting the timing of activities such as treating invasive species, operating visitor facilities, and scheduling climate-related events (e.g., flower festivals, autumn leaf-viewing). Recent work shows that 53% of natural resource parks managed by the United States National Park Service are experiencing extremely early springs (that...
This page contains NetCDF files of the Spring Leaf and Bloom Indices spanning 1880-2013. These files were created and are maintained by the USA National Phenology Network (www.usanpn.org). The Extended Spring Indices are mathematical models that predict the "start of spring" (timing of leaf out or bloom for species active in early spring) at a particular location (Schwartz 1997, Schwartz et al. 2006, Schwartz et al. 2013). These models were constructed using historical observations of the timing of first leaf and first bloom in a cloned lilac cultivar (S. x chinensis 'Red Rothomagensis') and two cloned honeysuckle cultivars (Lonicera tatarica 'Arnold Red' and L. korolkowii 'Zabelii'). Primary inputs to the model...
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Collaborating with Resource Managers to Identify and Address Phenological Information Needs
Plants and animals undergo certain recurring life-cycle events, such as springtime flowering or migrations between summer and winter habitats, that are often strongly controlled by changes in environmental conditions, including climate. Because species interact, shifts in one species’ phenology can have cascading effects throughout entire food webs and ecosystems. Recent advances have helped grow the body of literature surrounding phenology. We now know, for example, that invasive species often show greater flexibility in the timing of their phenological events, enabling them to outcompete native species as climate and environmental conditions change. Natural resource managers recognize that changes in phenology...
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