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


Ancient sag ponds add to diversity at HREC.

The UC Hopland Research & Extension Center has three very old natural "sag" ponds, geologically formed as a result of seismic activity which is common throughout California.  A sag pond is a body of water which forms as water collects in the lowest portions of a depression that forms between two strands of an active strike-slip fault.  Basically, as the land mass "stretches" because of seismic activity over time, the land between them sinks, thus forming such ponds.

The Maacama Fault runs directly underneath this region.

One of the "Lake Biological Area" ponds holds a permanent body of water (see photo), one is semi-permanent holding water throughout the summer in all but the most extreme drought years, and one is a "vernal pool" filling each winter but drying each summer.

Once home to Northern California Red-legged Frogs, as known from 1950s collected specimens, the introduction of non-native large-mouth bass, green sunfish, and bluegill along with the invasion by bullfrogs led to the extermination of this population of native frog species.   The ponds, however, are home to many unique plants, birds, animals, amphibians and invertebrates of the local area due to the long-standing, permanent wetlands habitat.

Posted on Tuesday, June 14, 2011 at 8:57 AM
  • Author: Robert J Keiffer

Oak cavities for critters

Previous Hopland BLog posts told about Turkey Vultures using large, hollow oak trees as nest sites, and that we have trail cameras set up on four of them to monitor the "comings and goings" of the parent birds ... and other critters that may be visiting the cavities.  Occasionally, a digital camera is quietly held at the cavity entrance and a photo snapped to see what is inside.  Experience has shown us that this does not disrupt the adult Turkey Vultures if one happens to be incubating eggs.   Here you see two young, about the size of small chickens, totally covered in white down feathers.   The adults will return to the nest to feed the young where they regurgitate food down their throats (there's nothing better than a warm meal!).  The trail cameras will hopefully capture how often such feeding takes place.

Posted on Friday, June 10, 2011 at 11:46 AM
  • Author: Robert J Keiffer

HREC provides a unique volunteer opportunity

The UC Hopland Research & Extension Center owns the UC's only range sheep flock, and the flock is now the largest remaining range flock in Mendocino County.   HREC annually manages a herd of about 650 breeding ewes of the "Targhee" breed, plus replacement ewes and assorted rams to total about 1000 head.   Herding dogs (usually Border Collies) and guard dogs (Great Pyrenees, Akbash, and Anatolian Shepherd breeds) have always played a critical role in the management of the flock.  Here you see a local youth, who has volunteered at HREC for several years now where he receives valuable "hands-on" training for himself and his herd dog.

Posted on Wednesday, June 8, 2011 at 12:11 PM
  • Author: Robert J Keiffer

Delegation of Korean farmers visits Kearney

A group of farmers from Tongyeong, South Korea, visited the UC Kearney Agricultural Research and Extension Center today to learn about the scope of research activities under way at the facility.

The visit was arranged by the City of Reedley, situated 4 miles east of Kearney. Reedley and Tongyeong are sister cities.

The visiting farmers produce a diversity of crops in South Korea, including citrus, strawberries, orchids, kiwis, mangos and figs. At Kearney, they toured the post harvest facility, research plots and the greenhouse. This afternoon and tomorrow they will visit local farms and packing houses.

The Korean farmers showed particular interest in UC's Navel and Valencia Export to Korea (NAVEK) program. In 2004, Korea rejected incoming citrus from California when inspectors detected fruit infected with Septoria spot, which is caused by a pest that has not been reported in Korea. UC scientists developed a fruit certification program to ensure that fruit with Septoria spot isn't shipped to Korea.

The Korean farmers' week long trip to the United States will not be all business. They plan to take time to visit the Grand Canyon National Park in Arizona and Las Vegas, Nev., according to their guide, Sonny Er.

Kearney superintendent of agriculture, Chuck Boldwyn, introduces the visitors to the California agriculture industry.

Assistant KARE program and facility coordinator, Julie Sievert, leads a tour of the Mitchell Post Harvest Research Center.

Korean visitors tour Kearney's extensive research plantings.

South Korean farmers pose with a banner from home at Kearney.

Posted on Tuesday, June 7, 2011 at 12:11 PM
Tags: Korea (1), visitors (1)

In 1792, the English explorer George Vancouver, upon his expedition through the Santa Clara Valley, referred to the Valley Oak (Quercus lobata) as "stately lords of the forest".  In 1861, William Brewer, the chief botanist for the first California Geological Survey said, "some of these oaks are noble indeed, one with a diameter of over 6 feet".  The UC-Hopland Research & Extension Center has many of these stately oaks, a few with 4-6 foot diameter trunks.  About twenty years ago a trunk "section-round' was collected from a nearby property (still in storage at HREC) and it has over 400 growth rings on it.  This oak species is endemic to California, growing in the hot interior valleys and foothills.  The Valley oak's deeply lobed, but blunt, leaves help with the identification.  In advancing age, the branches of many trees assume a majestic drooping characteristic. These large, mature trees provide an array of wildlife habitat elements including acorns for food and large cavities for denning and nesting.   Unfortunately, California has lost many of these stately oaks over the last 200 years due to land development for housing and agriculture purposes.

Posted on Tuesday, June 7, 2011 at 9:12 AM
  • Author: Robert J Keiffer

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