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Biological Diversity

Dwarf Mistletoe Research

Western hemlock dwarf mistletoe (Arceuthobium tsugense subsp. tsugense) is a small, parasitic plant that infects the leaves and branches of its host plant, the western hemlock (Tsuga heterophylla) tree. Within a forest, like the HJ Andrews Experimental Forest, areas of mistletoe infection are patchy. Some areas of the forest have trees that are not infected, while other areas have trees that are heavily infected. Hemlock trees infected with dwarf mistletoe grow dense, multi-branched growths, called witches’ brooms.

Andrews Forest Newsletter Spring 2019 Issue

News Brief Description: 

The Spring 2019 issue of the Andrews Forest Newsletter, is now available as an online version or as a downloadable PDF.

  • Get the buzz on meadow flowers and flower visitors
  • Find out what happens in the forest when a heavy snow falls 
  • Consider silence and the sound of the night
  • Track what’s happening to plant phenology as the climate warms

The Andrews Forest Newsletter is a semi-annual publication of the Andrews Forest Program. View past issues at https://andrewsforest.oregonstate.edu/publications/newsletter 

March of the Newts

News Brief Description: 

The rough-skinned newt is an emblem of moist forests of the Pacific Northwest. The newt is the unofficial mascot of the Andrews Forest -- it even shows up on our logo!  Check out this short film, March of the Newts, that celebrates the nature of newts and raises awareness around the prevention and detection of Bsal, a disease that threatens salamander species worldwide.

Thesis Defense Seminar on Oregon Streams

Event Date: 
Thursday, May 9, 2019
Event Brief Description: 

"Bottom-up drivers of primary producers and predator populations in Oregon streams"

Understanding factors limiting food web productivity is important to effective management of stream ecosystems and biota. Two key resources that influence productivity at the base of the food web are light and nutrients. Come hear about how two widespread anthropogenic modifications to stream ecosystems of the Pacific Northwest — riparian harvesting and the reduction of naturally spawning salmon — have altered light and nutrients in streams and how these changes may be impacting stream food webs. The first half focuses on how riparian stand development processes following historic clear-cutting influence stream consumers through bottom-up processes. The second half evaluates how the drastic reduction in spawning salmon in NE Oregon may be influencing stream food webs, and in particular juvenile Chinook Salmon and steelhead.

THURSDAY, MAY 9. 9AM NASH 032
WEBEX LINK: BEAV.ES/Zcc

2018 PhenoChampions: Oregon Season Tracker

News Brief Description: 

Congratulations to Oregon Season Tracker (OST), winner of the 2018 PhenoChampion Award of the National Phenology Network.  Started by Oregon State University Extension and HJ Andrews Experimental Forest LTER in 2014, OST links natural resource managers, educators, researchers, and community members in the shared goal of understanding how plants respond and adapt to regional variations in climate. You can read about how OST is training the next generation of climate scientists in this article from Clearing Magazine. As the PhenoChampion Award winners, OST received a customizable trail sign to tell visitors about their efforts. Find out more or learn how to get involved at http://oregonseasontracker.forestry.oregonstate.edu/ 

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