News & Publications

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Nature’s Notebook data show shift to earlier milkweed flowering

Thu, Jan 10, 2019
Publication Summary

Nature’s Notebook data were used to evaluate how common milkweed flowering is responding to changes in climate. With each degree of maximum temperature increase, the mean flowering date for milkweed shifted nearly four days earlier. The shift occurred across first, last, and mean flowering dates but did not extend to initial growth or fruit ripening. The shift became more significant over the period of 2011 to 2016. These findings will help managers develop conservation plans for this species and its pollinators.

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Overlooked climate factors predict flowering phenology best

Tue, Nov 27, 2018
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Researchers at UC Santa Barbara combined herbarium records with observations contributed by Nature’s Notebook participants to assess the impact of climate variables on timing of flowering in 2,500 species of plants. The authors found that maximum temperature, the number of frost-free days, and the quantity of precipitation as snow were the best predictors of flowering time for both herbarium and observed data. A better understanding of the climate variables that drive flowering phenology can help us anticipate how future changes in climate might impact flowering.

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USA-NPN 10 year Anniversary Event

Mon, Oct 22, 2018
News

In 2018, we commemorated 10 years of the USA National Phenology Network and data collection with Nature's Notebook. 

On October 19th, we brought together USA-NPN partners and Nature's Notebook leaders and observers at the home of the USA-NPN's National Coordinating Office in Tucson. There we reflected on the last 10 years of the USA-NPN and envisioned the next 10 years. 

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With the right resources, untrained observers record high-quality data

Mon, Sep 10, 2018
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In order to better understand precision and accuracy in phenology data collection and how that varies by training level, researchers at Acadia National Park’s Schoodic Institute compared data from three different observer types – expert professional scientists, trained citizen scientists, and untrained citizen scientists. The authors found that untrained citizen scientists recorded data that was as precise and sometimes more accurate than trained citizen scientists, likely due to a misinterpretation of materials presented at trainings. The authors recommend that informative datasheets, mid-season assessments and calibration trainings may help to ensure high-quality data.

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In loving memory of our dear friend and colleague Patty Guertin

Wed, May 23, 2018
News

It is with heavy hearts that we tell you of a great loss to the USA National Phenology Network. In May 2018 we lost Patty Guertin, our staff botanist who had been with us since the start of the USA-NPN. Taken from the world by cancer far too soon, she is sorely missed by her family, friends, and the coworkers who consider her family. 

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Seed dispersing bears influence plant community composition

Wed, May 23, 2018
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In a new study, researchers at Oregon State University sought to quantify the role bears in Alaska play in dispersing seeds. The authors estimated that brown and black bears disperse over 200,000 seeds per hour per square km while foraging for fleshy fruits and then excreting them on the landscape. Brown bears disperse more seeds than black bears overall, and at different times of the year. Because bears disperse a large percentage of the seeds of fleshy-fruit bearing species, they have a great influence on the species composition of plants in their ecosystems. If populations of bears are reduced, the number of fleshy-fruited shrubs may also decline and be replaced by wind-dispersed plants.

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Linking time-lapse camera data to phenology observations

Mon, Mar 19, 2018
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To better link phenology data from time-lapse cameras and on-the-ground observations, authors of a new study in Ecosphere compared digital images of tree foliage color from spring to autumn to observations made using the USA-NPN protocols. The authors also found that chill and minimum temperature in autumn, drought stress in autumn, and heat stress in summer are all important factors to the timing of peak fall foliage color.

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