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Influence of forest stand characteri...

McMillin, Joel David.

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Influence of forest stand characteristics and natural enemies on the spatial distribution of pine sawflies.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Influence of forest stand characteristics and natural enemies on the spatial distribution of pine sawflies./
Author:	McMillin, Joel David.
Description:	123 p.
Notes:	Source: Dissertation Abstracts International, Volume: 57-04, Section: B, page: 2298.
Contained By:	Dissertation Abstracts International57-04B.
Subject:	Ecology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9625765

Influence of forest stand characteristics and natural enemies on the spatial distribution of pine sawflies.
McMillin, Joel David.

Influence of forest stand characteristics and natural enemies on the spatial distribution of pine sawflies. - 123 p.

Source: Dissertation Abstracts International, Volume: 57-04, Section: B, page: 2298.

Thesis (Ph.D.)--Northern Arizona University, 1996.

The overall goal of this study was to examine the relationship between stand and site characteristics of pine and the distribution of pine sawflies (Hymenoptera: Diprionidae). To achieve this goal I first conducted a literature review to identify stand and site characteristics important in determining Diprionidae distributions and population dynamics. Although field observations of pine sawfly occurrence on open-grown trees and at specific elevations are common, there is a lack of detailed investigation on these phenomena.Subjects--Topical Terms:

516476
Ecology.

Influence of forest stand characteristics and natural enemies on the spatial distribution of pine sawflies.
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008 170521s1996 ||||||||||||||||| ||eng d
035 $a (MiAaPQ)AAI9625765
035 $a AAI9625765
040 $a MiAaPQ $c MiAaPQ
100 1 $a McMillin, Joel David. $3 3187297
245 1 0 $a Influence of forest stand characteristics and natural enemies on the spatial distribution of pine sawflies.
300 $a 123 p.
500 $a Source: Dissertation Abstracts International, Volume: 57-04, Section: B, page: 2298.
500 $a Co-Chairs: Peter W. Price; Michael R. Wagner.
502 $a Thesis (Ph.D.)--Northern Arizona University, 1996.
520 $a The overall goal of this study was to examine the relationship between stand and site characteristics of pine and the distribution of pine sawflies (Hymenoptera: Diprionidae). To achieve this goal I first conducted a literature review to identify stand and site characteristics important in determining Diprionidae distributions and population dynamics. Although field observations of pine sawfly occurrence on open-grown trees and at specific elevations are common, there is a lack of detailed investigation on these phenomena.
520 $a The second objective of my research was to quantify the spatial distributions of two pine sawfly species in relation to stand density and elevation in Arizona and in Sichuan, P.R. of China. Both species (Neodiprion autumnalis Smith in Arizona and N. xiangyunicus (Xiao and Huang) in Sichuan) were restricted to pure stands of their hosts at specific elevations. Defoliation of ponderosa pine (Pinus ponderosa Dougl. ex Laws) trees by N. autumnalis was also limited to stand basal areas of less than 5 m$\sp2$/ha.
520 $a The final objective was to compare the relative strengths of host plant and natural enemy effects in determining the distribution of a N. autumnalis. Lab and field studies indicated a linkage between oviposition preference for trees growing at low densities and at bottom slope elevations and progeny performance (egg survival and potential fecundity). Life table analyses further revealed that mortality attributed to host plant effects during the egg and larval stages had the largest impact on fitness. Overall, these results suggest that the distribution of N. autumnalis is caused by host plant effects. The varying effects of tritrophic level interactions may be further enhancing this pattern during certain life stages.
520 $a Tree vigor and foliage characteristics were also measured across the same tree density and elevation gradients. Results based on xylem water potential measurements suggest that N. autumnalis oviposition preference and progeny performance were not positively coupled with host plant stress. In addition foliage characteristics varied across stand density and elevation gradients in both Arizona and Sichuan. Needle size may be acting as a proximate factor in oviposition selection and subsequent progeny performance via enhanced larval feeding and defensive behavior.
590 $a School code: 0391.
650 4 $a Ecology. $3 516476
650 4 $a Entomology. $3 615844
650 4 $a Forestry. $3 895157
690 $a 0329
690 $a 0353
690 $a 0478
710 2 $a Northern Arizona University. $3 783744
773 0 $t Dissertation Abstracts International $g 57-04B.
790 $a 0391
791 $a Ph.D.
792 $a 1996
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9625765