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Gall morphology and the effects of h...

University of California, Los Angeles.

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Gall morphology and the effects of host plant water status on the Asphondylia auripila group on Larrea tridentata in the Mojave Desert, Granite Mountains, California.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Gall morphology and the effects of host plant water status on the Asphondylia auripila group on Larrea tridentata in the Mojave Desert, Granite Mountains, California./
Author:	Huggins, Thomas Roy.
Description:	152 p.
Notes:	Adviser: Henry A. Hespenheide.
Contained By:	Dissertation Abstracts International69-10B.
Subject:	Biology, Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3332564
ISBN:	9780549840923

Gall morphology and the effects of host plant water status on the Asphondylia auripila group on Larrea tridentata in the Mojave Desert, Granite Mountains, California.
Huggins, Thomas Roy.

Gall morphology and the effects of host plant water status on the Asphondylia auripila group on Larrea tridentata in the Mojave Desert, Granite Mountains, California. - 152 p.

Adviser: Henry A. Hespenheide.

Thesis (Ph.D.)--University of California, Los Angeles, 2008.

This dissertation is comprised of four studies about gall morphology and distribution in the Asphondylia auripila group (Diptera: Cecidomyiidae) on the desert shrub Larrea tridentata (Zygophyllaceae). Gall morphology in the Asphondylia auripila group is diverse and species specific. To explain this interspecific variation in gall morphology I introduce a "microclimate hypothesis" that proposes that gall morphologies represent unique adaptations to the abiotic properties or microclimate of a gall's habitat. My results demonstrate that (1) galls in the auripila group have species-specific distributions within and between four discrete plant surfaces, (2) galls have discrete species-specific morphologies, but may be categorized into three gross morphological types, and (3) gall morphological types are more or less consistent within plant surfaces. Using plant morphology as a model for gall adaptation, variation in gall morphology such as SGA, surface area, and pubescence parallel well documented morphological plant adaptations in and environments, suggesting that microclimatic conditions associated with gall substrates may explain interspecific differences in gall morphology.

ISBN: 9780549840923Subjects--Topical Terms:

1017726
Biology, Ecology.

Gall morphology and the effects of host plant water status on the Asphondylia auripila group on Larrea tridentata in the Mojave Desert, Granite Mountains, California.
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020 $a 9780549840923
035 $a (UMI)AAI3332564
035 $a AAI3332564
040 $a UMI $c UMI
100 1 $a Huggins, Thomas Roy. $3 1028925
245 1 0 $a Gall morphology and the effects of host plant water status on the Asphondylia auripila group on Larrea tridentata in the Mojave Desert, Granite Mountains, California.
300 $a 152 p.
500 $a Adviser: Henry A. Hespenheide.
500 $a Source: Dissertation Abstracts International, Volume: 69-10, Section: B, page: 5882.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2008.
520 $a This dissertation is comprised of four studies about gall morphology and distribution in the Asphondylia auripila group (Diptera: Cecidomyiidae) on the desert shrub Larrea tridentata (Zygophyllaceae). Gall morphology in the Asphondylia auripila group is diverse and species specific. To explain this interspecific variation in gall morphology I introduce a "microclimate hypothesis" that proposes that gall morphologies represent unique adaptations to the abiotic properties or microclimate of a gall's habitat. My results demonstrate that (1) galls in the auripila group have species-specific distributions within and between four discrete plant surfaces, (2) galls have discrete species-specific morphologies, but may be categorized into three gross morphological types, and (3) gall morphological types are more or less consistent within plant surfaces. Using plant morphology as a model for gall adaptation, variation in gall morphology such as SGA, surface area, and pubescence parallel well documented morphological plant adaptations in and environments, suggesting that microclimatic conditions associated with gall substrates may explain interspecific differences in gall morphology.
520 $a The relationship between plant water status and Asphondylia gall densities was also investigated. Improvements in plant water status due to increased precipitation were associated with community-wide declines in gall density, a result consistent with previous studies. Within the general decline in gall density, individual gall species behaved more or less independently. Ecologically sensitive galls responded robustly to relatively short-term interannual changes in plant water status. Gall species may be considered mesophyllic or xerophyllic based on the nature of their response to plant water status, their phenologies, as well as their response to plant characteristics associated with water status. During an experimental manipulation, galls again responded negatively to increases in plant water status. Total gall density was negatively correlated with stem water content and plant growth, but not correlated with meristem density. These results did not support the meristem hypothesis, which proposes that decreases in plant water status increase meristem density, which increases oviposition opportunities for gall-makers. Because gall density was strongly correlated with plant growth measured as node production, hypotheses based on plant growth rather than meristem density better explain the results of this study.
590 $a School code: 0031.
650 4 $a Biology, Ecology. $3 1017726
650 4 $a Biology, Plant Physiology. $3 1017865
690 $a 0329
690 $a 0817
710 2 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertation Abstracts International $g 69-10B.
790 $a 0031
790 1 0 $a Hespenheide, Henry A., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3332564