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Life history correlates in female pa...

The University of Arizona.

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Life history correlates in female parasitoid wasps: Exploring old concepts and new frontiers.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Life history correlates in female parasitoid wasps: Exploring old concepts and new frontiers./
Author:	Asplen, Mark Kenneth.
Description:	102 p.
Notes:	Adviser: David N. Byrne.
Contained By:	Dissertation Abstracts International68-03B.
Subject:	Biology, Entomology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3255674

Life history correlates in female parasitoid wasps: Exploring old concepts and new frontiers.
Asplen, Mark Kenneth.

Life history correlates in female parasitoid wasps: Exploring old concepts and new frontiers. - 102 p.

Adviser: David N. Byrne.

Thesis (Ph.D.)--The University of Arizona, 2007.

Although parasitoid wasps have shown promise as model systems for studying life history evolution, empirical studies of certain traits in these small insects have proven difficult. In this dissertation, two "black boxes" in the life histories of female parasitoids are examined: (1) oosorption, and (2) dispersal by flight. I first demonstrate that a short-lived species with high early reproductive investment (Eretmocerus eremicus) resorbs eggs, which runs counter to the notion that the time costs of oosorption are prohibitive to such wasps. Instead, it appears that the resorption mechanism in E. eremicus is capable of both decreasing costs and increasing nutritional benefits of oosorption relative to that of other parasitoid species. In addition, a literature review reveals four functional hypotheses for parasitoid oosorption: (1) age-related egg apoptosis, (2) conservation of ovarian capacity, and (3) nutrient allocation to either longevity or future oogenesis. As none of these can be rejected, I propose several avenues of future research: (1) refinement of physiological techniques to measure nutrient traffic into and out of eggs, (2) morphological phylogenetic studies of oosorption mechanisms, (3) development of lifetime nutrient budgets for parasitoids with different reproductive life histories, (4) examination of decay rates of oocytes with different yolk types, and (5) increased study of ovarian dynamics in pro-ovigenic parasitoids.Subjects--Topical Terms:

1018619
Biology, Entomology.

Life history correlates in female parasitoid wasps: Exploring old concepts and new frontiers.
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005 20100630
008 100630s2007 ||||||||||||||||| ||eng d
035 $a (UMI)AAI3255674
035 $a AAI3255674
040 $a UMI $c UMI
100 1 $a Asplen, Mark Kenneth. $3 1018627
245 1 0 $a Life history correlates in female parasitoid wasps: Exploring old concepts and new frontiers.
300 $a 102 p.
500 $a Adviser: David N. Byrne.
500 $a Source: Dissertation Abstracts International, Volume: 68-03, Section: B, page: 1409.
502 $a Thesis (Ph.D.)--The University of Arizona, 2007.
520 $a Although parasitoid wasps have shown promise as model systems for studying life history evolution, empirical studies of certain traits in these small insects have proven difficult. In this dissertation, two "black boxes" in the life histories of female parasitoids are examined: (1) oosorption, and (2) dispersal by flight. I first demonstrate that a short-lived species with high early reproductive investment (Eretmocerus eremicus) resorbs eggs, which runs counter to the notion that the time costs of oosorption are prohibitive to such wasps. Instead, it appears that the resorption mechanism in E. eremicus is capable of both decreasing costs and increasing nutritional benefits of oosorption relative to that of other parasitoid species. In addition, a literature review reveals four functional hypotheses for parasitoid oosorption: (1) age-related egg apoptosis, (2) conservation of ovarian capacity, and (3) nutrient allocation to either longevity or future oogenesis. As none of these can be rejected, I propose several avenues of future research: (1) refinement of physiological techniques to measure nutrient traffic into and out of eggs, (2) morphological phylogenetic studies of oosorption mechanisms, (3) development of lifetime nutrient budgets for parasitoids with different reproductive life histories, (4) examination of decay rates of oocytes with different yolk types, and (5) increased study of ovarian dynamics in pro-ovigenic parasitoids.
520 $a Next, I describe results from a vertical flight chamber study designed to test hypotheses regarding the correlation between pre-oviposition dispersal and reproductive effort in parasitoid wasps. This experiment was conducted on 1-d-old female whitefly parasitoids from five species in two genera. The two Eretmocerus spp. showed a higher flight propensity than the three Encarsia spp. This may be, in part, due to a more time limited life history in the former. Within species, egg load did not correlate well with flight propensity for all species examined. Finally, among individuals of Er. eremicus, the relationship between effective flight distance and egg load appears to be context dependent, as data consistent with both positive and negative correlations were collected. Correlational changes between flight distance and egg load may be due to variation in biotic (female longevity) or abiotic (temperature, relative humidity) factors.
590 $a School code: 0009.
650 4 $a Biology, Entomology. $3 1018619
690 $a 0353
710 2 $a The University of Arizona. $3 1017508
773 0 $t Dissertation Abstracts International $g 68-03B.
790 $a 0009
790 1 0 $a Byrne, David N., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3255674