Research and Extension Center System
University of California
Research and Extension Center System


Sheep roam freely on University Road

The Hopland Research & Extension Center is accessed by University Road which is a county road.  It is one of the last Mendocino County roads with a livestock "cattleguard" ( metal grate-like structure at ground level that prevents livestock from crossing without the need for a gate) maintained by the county.   At times when HREC has sheep grazing in Vassar Pasture, visitors get the thrill of seeing sheep on the road ... literally!

Posted on Thursday, April 21, 2011 at 8:32 AM
  • Author: Robert J Keiffer

HREC Greenhouse retrofit makes it aphid-proof.

Beginning in 2010, a group of researchers began assessing an individual's risk of acquiring an infectious disease ("disease risk") and whether or not that risk can be determined by a handful of ecological traits of the host individual.  They are also looking to see if other host species that are potential sources of infection play a role ("community context").  The experiments utilize aphids and grasses and a certain grass-specific virus as the model.  The HREC greenhouse has been retrofitted to be aphid-proof" to allow the propagation of "virus-free" grasses.

Posted on Wednesday, April 20, 2011 at 11:11 AM
  • Author: Robert J Keiffer

33 Years of Rain Data from HREC!

In 1977 the US State Agricultural Experiment Stations (SAES) began a nationwide project to monitor atmospheric deposition and study its effects on the environment.  This project is titled the National Atmospheric Deposition Program (NADP). The NADP precipitation chemistry network, which began in 1978, has the goal of providing data on the amounts, trends, and geographic distributions of acids, nutrients, and base cations in rainfall.  NADP site CA45, located at HREC, has collected some of the cleanest rain water in the nation due to the fact that most moisture in our storms is derived from moisture over the Pacific Ocean (not many industrial plants out there!).

Posted on Tuesday, April 19, 2011 at 8:14 AM
  • Author: Robert J Keiffer

Look who's visiting the TUVU nest tree!

TUVU is the scientific acronym for Turkey Vulture.  Remember the tree from the last post?  Well, that tree has been a successful Turkey Vulture nest in years' past, but look who is living in the tree now.   Several photos captured this raccoon leaving (at dusk) and entering the tree (at dawn) which tells us that this critter is using the tree for daytime sleeping.  TUVUs have actually looked into this tree cavity this year, so will they attempt to nest there? 

Posted on Monday, April 18, 2011 at 8:27 AM
  • Author: Robert J Keiffer

Turkey Vulture nest sites monitored at HREC

We have four trail cameras set up on Turkey Vulture nest sites in an attempt to gather data on the activity of the adult birds.   So far all four sites have been visited by adult vultures.  Unknown to many folks is the importance to old decadent hollow oak trees to provide nest cavities for these birds.  The photo shows one of the trees and the camera set on a post.

Posted on Saturday, April 16, 2011 at 7:51 PM
  • Author: Robert J Keiffer

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