Friday, October 31, 2014
YOLO COUNTY NEWS
99 CENTS

Researchers learn more about oak apple galls

Researcher Ian Pearse looks at an oak apple gall. His research team at UC Davis studied galls on valley oaks in Davis, Woodland and Vacaville. Kathy Keatley Garvey/Courtesy photo

By
March 31, 2011 |

Those valley oak trees in California’s Central Valley have a lot of gall.

Scientists Ian Pearse, Maxwell Joseph and Melanie Gentles of the UC Davis department of entomology knew that going into their research, but in a survey of 1,234 oak apple galls, what they found has led to a better understanding of the gall-making wasps and the organisms that prey upon them or live with them.

“Oak apple galls are themselves a complex ecosystem, with over 20 species of insects, that are in many people’s back yards,” said Pearse, who is studying for his doctoral degree in entomology with major professor Rick Karban. “The galls and their wasps are not a major problem for oaks but are themselves food for other organisms such as birds and other insects.”

The wasp, a member of the Cynipidae family, lays her eggs on the leaves or twigs of a valley oak, which then forms a gall or a structure that resembles an apple hanging from the tree.

“The gall is actually very beneficial, and necessary, for the insect,” Pearse said. In reality, the insect “ ‘coerces’ the plant to make it a great home.”

Their research, published in a recent edition of the international journal Biodiversity and Conservation, shed light on the natural history of the common oak apple gall and its parasitoid and inquilines community. They found that the composition of the insect community varies with galls of different size, phenology and location. Their collection sites included Davis (around Putah Creek), Woodland and Vacaville.

The researchers discovered that the gall maker “most often reached maturity in larger galls that developed later in the season.”

Galls, which hang on the valley oaks like apples, are especially visible this time of year.

Researcher Joseph, who worked closely with UCD professors Sharon Lawler and Rick Karban, recently received his bachelor of science degree in wildlife, fish and conservation biology. Joseph is studying for his doctorate in ecology and evolutionary biology at the University of Colorado.

Gentles, who worked with major professor (now emeritus) Les Ehler at UCD, received her master’s degree in entomology. She is the UCD campus arborist.

Comments

comments

Kathy Keatley Garvey

  • Recent Posts

  • Enter your email address to subscribe to this newspaper and receive notifications of new articles by email.

  • .

    News

    Gardner guilty of murder, with special circumstances

    By Lauren Keene | From Page: A1 | Gallery

     
    State superintendent makes campaign stop in Davis

    By Jeff Hudson | From Page: A1 | Gallery

     
    Bob Dunning: Lawn display causes a theological crisis

    By Bob Dunning | From Page: A2 | Gallery

    Couple killed in Yolo County crash

    By Lauren Keene | From Page: A2

     
    Same-party races challenge incumbents

    By The Associated Press | From Page: A2

    State races test one-party rule

    By New York Times News Service | From Page: A2

     
    Meet Poppenga at Saturday reception

    By Enterprise staff | From Page: A2

     
    Indians celebrate Diwali with gala on Sunday

    By Special to The Enterprise | From Page: A3

    Rairdan dinged for late report

    By Jeff Hudson | From Page: A3

     
    Veterans will tailgate at ‘Salute to Heroes’ game

    By Enterprise staff | From Page: A3

    Wolk hailed for environmental votes

    By Enterprise staff | From Page: A3

     
    Yamada honored for leadership on aging issues

    By Enterprise staff | From Page: A3

    Embroidery group meets at mall

    By Enterprise staff | From Page: A3

     
    Local artisans featured at holiday craft fair

    By Enterprise staff | From Page: A4

    Got bikes? Donate ‘em!

    By Enterprise staff | From Page: A4

     
    Kids walk for friends at Birch Lane

    By Special to The Enterprise | From Page: A4

    Explorit: Creep out with some spooky science

    By Lisa Justice | From Page: A4

     
    Shambhala offers Tai Chi class

    By Special to The Enterprise | From Page: A4

    Bones for Life classes offered

    By Enterprise staff | From Page: A4

     
    Bet Haverim will hear Israel update

    By Special to The Enterprise | From Page: A4

    Enjoy wine, music and art at Sunday fundraiser for DHS choir

    By Anne Ternus-Bellamy | From Page: A9

     
    .

    Forum

    New-school cheating on the smartphone

    By Creators Syndicate | From Page: B5

     
    Garamendi, Dodd get my votes

    By Letters to the Editor | From Page: A10

    Tom Meyer cartoon

    By Debbie Davis | From Page: A10

     
    High hopes for Sunder

    By Letters to the Editor | From Page: A10

    Public service is in her heart

    By Letters to the Editor | From Page: A10

     
    A calm, thoughtful voice

    By Letters to the Editor | From Page: A10

    Sunder is a perfect fit

    By Letters to the Editor | From Page: A10

     
    Best predictor is past behavior

    By Letters to the Editor | From Page: A10

    Vote for students, with Tuck

    By Letters to the Editor | From Page: A10

     
    My choices on Tuesday

    By Letters to the Editor | From Page: A10

     
    .

    Sports

    Blue Devil girls net an easy win at Grant

    By Enterprise staff | From Page: B1 | Gallery

     
    Aggie offense A-OK; now what about defense?

    By Bruce Gallaudet | From Page: B1 | Gallery

    In Davis, rugby is as American as apple pie

    By Bruce Gallaudet | From Page: B1

     
    DHS plays undefeated Pacers Friday night

    By Enterprise staff | From Page: B1

     
     
    Niemi’s 43 saves aren’t enough in loss to Wild

    By The Associated Press | From Page: B8 | Gallery

    .

    Features

    .

    Arts

    Calling all artists for upcoming show

    By Enterprise staff | From Page: A11

     
    ‘Birdman': A dark comedy that soars

    By Derrick Bang | From Page: A11

     
    DHS Madrigals host singing workshop

    By Enterprise staff | From Page: A12

     
    Marcia Ball to play at The Palms

    By Enterprise staff | From Page: A12 | Gallery

     
    .

    Business

    Big, capable luxury defines Yukon

    By Ann M. Job | From Page: A5 | Gallery

     
    .

    Obituaries

    Joseph Francis Gray

    By Special to The Enterprise | From Page: A4

     
    .

    Comics

    Comics: Friday, October 31, 2014

    By Creator | From Page: B6

     
    .

    Real Estate Review

    Featured Listing

    By Special to The Enterprise | From Page: RER1

    Professional Services Directory

    By Special to The Enterprise | From Page: RER2

    Lyon Real Estate

    By Special to The Enterprise | From Page: RER3

    RE/Max Gold

    By Special to The Enterprise | From Page: RER4

    Kim Eichorn

    By Special to The Enterprise | From Page: RER5

    Susan von Geldern

    By Special to The Enterprise | From Page: RER6

    Team Traverso

    By Special to The Enterprise | From Page: RER6

    Yolo FCU

    By Special to The Enterprise | From Page: RER6

    Juan Ramirez

    By Special to The Enterprise | From Page: RER6

    Tracy Harris

    By Special to The Enterprise | From Page: RER7

    Susan von Geldern

    By Special to The Enterprise | From Page: RER7

    Wells Fargo Home Mortgage

    By Special to The Enterprise | From Page: RER8

    Julie Leonard

    By Special to The Enterprise | From Page: RER8

    Joe Kaplan

    By Special to The Enterprise | From Page: RER9

    Melrina A Maggiora

    By Special to The Enterprise | From Page: RER9

    Coldwell Banker

    By Special to The Enterprise | From Page: RER10

    Leslie Blevins

    By Special to The Enterprise | From Page: RER12

    Julie Partain

    By Special to The Enterprise | From Page: RER12

    Robin Garland

    By Special to The Enterprise | From Page: RER13

    Jamie Madison

    By Special to The Enterprise | From Page: RER13

    Diane Lardelli

    By Special to The Enterprise | From Page: RER13

    Karen Waggoner

    By Special to The Enterprise | From Page: RER14

    Jamie Madison & Associates

    By Special to The Enterprise | From Page: RER14

    Lisa Haass

    By Special to The Enterprise | From Page: RER14

    Ciana Wallace

    By Special to The Enterprise | From Page: RER15

    Travis Credit Union

    By Special to The Enterprise | From Page: RER16

    Malek Baroody

    By Special to The Enterprise | From Page: RER17

    Marcelo Campos

    By Special to The Enterprise | From Page: RER18

    F1rst Street Real Estate

    By Special to The Enterprise | From Page: RER20