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THE ECOLOGY OF THE GALLS OF ATRIPLEX...
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University of California, Riverside.
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THE ECOLOGY OF THE GALLS OF ATRIPLEX SPP. (CHENOPODIACEAE) IN SOUTHERN CALIFORNIA.
Record Type:
Language materials, printed : Monograph/item
Title/Author:
THE ECOLOGY OF THE GALLS OF ATRIPLEX SPP. (CHENOPODIACEAE) IN SOUTHERN CALIFORNIA./
Author:
HAWKINS, BRADFORD ALAN.
Description:
208 p.
Notes:
Source: Dissertation Abstracts International, Volume: 45-03, Section: B, page: 0770.
Contained By:
Dissertation Abstracts International45-03B.
Subject:
Biology, Entomology. -
Online resource:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8413180
THE ECOLOGY OF THE GALLS OF ATRIPLEX SPP. (CHENOPODIACEAE) IN SOUTHERN CALIFORNIA.
HAWKINS, BRADFORD ALAN.
THE ECOLOGY OF THE GALLS OF ATRIPLEX SPP. (CHENOPODIACEAE) IN SOUTHERN CALIFORNIA.
- 208 p.
Source: Dissertation Abstracts International, Volume: 45-03, Section: B, page: 0770.
Thesis (Ph.D.)--University of California, Riverside, 1984.
The galls of Atriplex support 37 common species of inquilines, predators, and parasitoids. A food web of the gall community is provided.Subjects--Topical Terms:
1018619
Biology, Entomology.
THE ECOLOGY OF THE GALLS OF ATRIPLEX SPP. (CHENOPODIACEAE) IN SOUTHERN CALIFORNIA.
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THE ECOLOGY OF THE GALLS OF ATRIPLEX SPP. (CHENOPODIACEAE) IN SOUTHERN CALIFORNIA.
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208 p.
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Source: Dissertation Abstracts International, Volume: 45-03, Section: B, page: 0770.
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Thesis (Ph.D.)--University of California, Riverside, 1984.
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The galls of Atriplex support 37 common species of inquilines, predators, and parasitoids. A food web of the gall community is provided.
520
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Atriplex canescens (Prush) Nuttall and A. polycarpa (Torrey) Watson support 12 distinct gall morphotypes in southern California. Nine of these galls are incited by a group of morphologically indistinguishable gall midges (Diptera: Cecidomyiidae) in the genus Asphondylia. A series of field studies in the Colorado Desert (Coachella Valley), south-central Mojave Desert, and inland chaparral comparing the structure of the galls and the phenologies, distributions, densities, and population structures of selected groups of the midges provided evidence that the flies represent a sibling species complex. An electrophoretic study of seven of the Asphondylia spp. provided evidence that the midges are genetically distinct and do not interbreed in the field.
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Cluster analysis (UPGMA) grouped the 15 common species of parasitic Hymenoptera into three host-guilds of five species each: (1) specialists in a stem and leaf gall on A. canescens, (2) specialists in woolly stem galls on A. polycarpa, and (3) generalists that attack all galls. Furthermore, guild 1 dominated the galls with which it was associated, while guild 3 dominated the remainder, including the woolly stem galls.
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Host seasonality partly determined parasitoid population dynamics and guild structure. The expression of parasitoid dominance increased with lengthening gall duration, suggesting that parasitoid competition depended on resource stability. Host seasonality also presented a series of basic resource "types" to which parasitoids adapted. Continuously available galls were dominated by their specialists, while all seasonal galls were dominated by generalists. The sub-dominant specialists of woolly stem galls may represent a guild of competitively inferior species unable to compete with aggressive generalists. The characteristics accounting for the success of the parasitoids in the galls is also discussed. Lastly, the novel biology of the gall-forming Tetrastichus cecidobroter is presented.
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School code: 0032.
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University of California, Riverside.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8413180
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