Spring in the desert means it’s time to plant Joshua trees. Read MoreĪ Joshua tree seedling in one of the gardens. That’ll be what we hope to discover with the data we will collect next year in the summer of 2022. While we definitely could see garden effects, it’s too early to tell if plants from different populations are faring better in different gardens. The seedlings are only a few inches tall, but already we can see differences in “garden effects” – that is, seedlings in the hottest garden are growing much more slowly than those in a wetter, more northerly garden.
The four common gardens are spread across the Mojave and have been planted with Joshua trees ( Yucca brevifolia and Yucca jaegeriana) from populations that have different home environments. Earlier this spring Todd and Lesley led a massive effort, assisted by a small army of USGS researchers, to get the seedlings started and planted in the gardens. Todd and Lesley have led the development of our common garden experiments and manage the day-to-day operations of the gardens. Todd Esque, both with the USGS, are based. We all met outside of Las Vegas, Nevada, where JTGP scientists Dr. We’re about a year into the project seeds of Joshua trees were started back in 2020, seedlings were out-planted earlier this spring, and now we’re giving them a year to acclimate to their common gardens before we assess the level to which local adaptation is playing a role in shaping the demography, population structure, and long-term success of this iconic desert species. That’s the kind of heat the Joshua Tree project’s team members found themselves in early June when we all met in the desert to collect some preliminary data for our NSF award.
#JOSHUA TREE GPS TRACKS SKIN#
There’s heat, and then there’s Nevada’s 105☏ heat that is so dry your skin feels like it should audibly sizzle when you step outside.
#JOSHUA TREE GPS TRACKS UPDATE#
(Photo by Karolina Heyduk)Ī fieldwork update from JTGP collaborator Karolina Heyduk, a plant physiologist and Assistant Professor at the University of Hawai’i Mānoa. Collaborators Jeremy Yoder (left) and Lesley DeFalco prepare to take measurements on a seedling after dark.Collaborator Jeremy Yoder attempts plant physiology with the LiCor instrument.
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