Titre du document / Document title

Preference and performance of a generalist insect herbivore on Quercus agrifolia and Quercus engelmannii seedlings from a southern California oak woodland

Auteur(s) / Author(s)

DUNNING Connell E. ⁽¹⁾ ; REDAK Richard A. ^{(1 2)} ; PAINE Timothy D. ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Department of Entomology, University of California, Riverside, CA 92521, ETATS-UNIS
⁽²⁾ Center for Conservation Biology, University of California, Riverside, CA 92521, ETATS-UNIS

Résumé / Abstract

Knowledge of the impact that insects have on oak seedlings planted in restoration programs is important for land managers and those interested in maintaining visible populations of a variety of oak species. Once established as seedlings, oaks face potential herbivory by mammals and phytophagous insects. To determine potential damage of a common generalist insect herbivore on oak seedlings, we conducted performance and preference tests using a grasshopper (Melanoplus sanguinipes) and two species of oaks (Quercus agrifolia and Quercus engelmannii) occurring in a southern California oak grassland. Q. agrifolia is abundant and often used in restoration plantings, while Q. engelmannii has the smallest range of all native oaks in California. To quantify herbivore performance, we measured leaf area of 30 Q. agrifolia and 30 Q. engelmannii seedlings, and caged them individually with a single grasshopper within acetate feeding arenas. Performance then was estimated by determining amount of leaf area eaten and frass produced. Grasshopper preference for either oak species was estimated in replicated choice experiments. M. sanguinipes consumed significantly more leaf area and produced significantly more frass when feeding only on Q. agrifolia than when feeding solely on Q. engelmannii. Additionally, grasshoppers feeding on Q. agrifolia gained significantly more biomass, whereas those feeding on Q. engelmannii actually lost biomass. Q. agrifolia provided a better diet than Q. engelmannii for this grasshopper species, a result that has the potential to affect the success of seedling planting programs in areas where both oaks and M. sanguinipes occur.

Revue / Journal Title

Forest ecology and management   ISSN 0378-1127   CODEN FECMDW 

Source / Source

2003, vol. 174, n^o1-3, pp. 593-603 [11 page(s) (article)] (2 p.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1976) (Revue)

Mots-clés anglais / English Keywords

Phytophagous ; Spermatophyta ; Angiospermae ; Dicotyledones ; Fagaceae ; Hardwood forest tree ; Pest ; America ; North America ; United States ; Invertebrata ; Arthropoda ; Insecta ; Orthoptera ; Acridoidea ; Acrididae ; Plant juvenile growth stage ; Animal plant relation ; California ; Melanoplus sanguinipes ; Afforestation ; Forest regeneration ; Weight gain ; Growth ; Leaf area ; Performance evaluation ; Browsing (damage) ; Damage ; Feeding preference ;

Mots-clés français / French Keywords

Phytophage ; Spermatophyta ; Angiospermae ; Dicotyledones ; Fagaceae ; Arbre forestier feuillu ; Déprédateur ; Amérique ; Amérique du Nord ; Etats Unis ; Invertebrata ; Arthropoda ; Insecta ; Orthoptera ; Acridoidea ; Acrididae ; Quercus engelmannii ; Quercus agrifolia ; Stade juvénile plante ; Relation animal végétal ; Californie ; Melanoplus sanguinipes ; Reboisement ; Régénération forestière ; Prise poids ; Croissance ; Surface foliaire ; Evaluation performance ; Abroutissement ; Dégât ; Préférence alimentaire ;

Mots-clés espagnols / Spanish Keywords

Fitófago ; Spermatophyta ; Angiospermae ; Dicotyledones ; Fagaceae ; Arbol forestal frondoso ; Plaga ; America ; America del norte ; Estados Unidos ; Invertebrata ; Arthropoda ; Insecta ; Orthoptera ; Acridoidea ; Acrididae ; Estado juvenil planta ; Relación animal vegetal ; California ; Melanoplus sanguinipes ; Reforestación ; Regeneración forestal ; Ganancia peso ; Crecimiento ; Superficie foliar ; Evaluación prestación ; Ramoneo ; Estrago ; Preferencia alimentaria ;

Mots-clés d'auteur / Author Keywords

Restoration ; Oak ; Seedling ; Herbivory ; Grasshopper ; Preference ;

Localisation / Location

INIST-CNRS, Cote INIST : 17223, 35400010768837.0430