All posts by Michelle Mack

South African Field Trip

In March, the lab group made a trip to Kruger National Park in South Africa to survey the tree resprouting experiment.  Savanna trees suffer frequent damage from large herbivores. Often the whole crown of the tree is knocked over and crushed.  How fast and vigorously a damaged tree can resprout determines survival, growth, and reproduction–things that plant ecologists, like us, find fascinating.  Resprouting is also important for maintaining forage for animals, firewood for humans, and for carbon storage in these ecosystems.  In 2011, we set up an experiment across the Kruger Climate Gradient to examine what factors control tree resprouting.  Is it soil moisture?  Soil nutrients?  Tree species? Tree age or size?  We are exploring these questions while enjoying the southern hemisphere sun!

Tree carnage

Becky Hewitt (left), Samantha Miller (center), and Ben Ketter (right) chortle over trees decapitated for developing allometric relationships.

Xan tree height

Xanthe Walker discovers that savanna trees are much taller than those in the taiga ecosystems of the high northern latitudes.

Small measurements

Thoughtful measurement of stem diameters by Ben Ketter (left), Becky Hewitt (middle) and Corey Nielson (right).

Rico cage

Ricardo Holdo (center) protects himself from herbivores while Ben Ketter (left) takes notes.

Xanthe Walker joins lab as new postdoc!

The Mack lab is very excited to welcome Dr. Xanthe Walker to the lab in her new role as a postdoctoral researcher.  Xanthe brings her expertise in fire ecology and dendrochronology. She will work on the new NASA Arctic Boreal Research project, studying the impacts of severe fires on the loss of old carbon from boreal forest and arctic tundra soils.  Xanthe also brings her expertise in Brett Michaels-style Buff wearing, braving mosquitos without a bug shirt (see Samantha’s attire for contrast), and multivariate statistics.

Xanthe 2015

Relocated in the Southwest

Michelle and family, pictured below amidst the sunflowers, have moved to Northern Arizona University in Flagstaff, AZ, to join the Center for Ecosystem Science and Society and the Department of Biological Sciences.  Samantha Miller, lab manager extraordinaire pictured in stylish field gear, made the move from Florida, too, to set up the new lab.  The truck full of lab gear arrived last week, bringing hundreds of boxes of archived samples and all of our equipment to a new home.

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