Results 271 to 280 of about 32,431 (313)

Dynamic Complexities in a Host-Parasitoid System with Aggregated Parasitoid

2009 First International Conference on Information Science and Engineering, 2009
The effect of aggregated parasitoid on a host-parasitoid system are investigated qualitatively by computer simulation. Our numerical simulations show that the aggregation of parasitoid can stabilize the population dynamics when the density-dependent effects of host is weak, while it can also destabilize the system when the density-dependent effect of ...
Huawei Dai, Hua Liu, Wenlong Li, Zizhen Li   +3 more
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Dynamic complexities in a parasitoid-host-parasitoid ecological model

Chaos, Solitons & Fractals, 2009
Abstract Chaotic dynamics have been observed in a wide range of population models. In this study, the complex dynamics in a discrete-time ecological model of parasitoid-host-parasitoid are presented. The model shows that the superiority coefficient not only stabilizes the dynamics, but may strongly destabilize them as well.
Hengguo Yu, Songjuan Lv, Lili Zhu, Min Zhao   +3 more
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Host/parasitoid interactions: critical timing of parasitoid-derived products

Journal of Insect Physiology, 1998
Short-term in vitro incubations were used to examine the ability of endoparasitoid larvae to produce and release both ecdysteroids and proteins into their environment. Second instar larvae of both Chelonus near curvimaculatus and Ascogaster quadridentata were observed by SDS-PAGE to release temporally-similar polypeptides in the 20-30kD M(r) range ...
John J. Brown, Darcy A. Reed
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Teratocytes and their functions in parasitoids

Current Opinion in Insect Science, 2014
Some endoparasitoid wasps (Hymenoptera) produce teratocytes, which are a type of cell that is released into host insects when wasp eggs hatch. In this short review I first summarize the different taxa of wasps that produce teratocytes, the embryonic origin of these cells, and key features of teratocyte growth.
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Predators and Parasitoids

2003
Predators and Parasitoids: An Introduction. Natural Enemies and Pest Control: An Integrated Pest Management Concept. Biological Control by Augmentation of Natural Enemies: Retrospect and Prospect. Developing Trichogramma as a Pest Management Tool. Tritrophic Interactions: The Inducible Defenses of Plants.
Opender Koul, G. S. Dhaliwal
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Parasitoids, polydnaviruses and endosymbiosis

Parasitology Today, 1990
Symbiotic associations traditionally have been treated as evolutionary curios rather than as a major source of evolutionary innovation. Recent research on a wide variety of organisms is changing this view and is breaking down the barriers between the traditional categories of parasitism, commensalism and mutualism, to produce a more flexible view of ...
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Parasitoids

2009
Publisher Summary This chapter focuses on the parasitoids, insects with a parasitic larval stage that develops by feeding on the body of a single host insect or other arthropod. Feeding by the larval parasitoid invariably results in the death of its host, and the resulting adult parasitoid is a free living insect.
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Insect immune resistance to parasitoids

Insect Science, 2008
AbstractInsect host—parasitoid interactions involve complex physiological, biochemical and genetic interactions. Against endoparasitoids, immune‐competent hosts initiate a blood cell‐mediated response that quickly destroys the intruders and envelops them in a multilayered melanotic capsule. During the past decade, considerable progress has been made in
Carton, Yves, Poirie, Marylene, Nappi, Anthony J.   +2 more
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What determines host range in parasitoids? An analysis of a tachinid parasitoid community

Oecologia, 2003
Despite the vast diversity of parasitic insects and their importance in natural and agricultural communities, our knowledge of what determines their patterns of association with hosts remains sparse. Unlike most parasites that tend to be specialized, parasitoid flies in the family Tachinidae exhibit a broad spectrum of host-specificity, with many ...
Michael S. Singer, John O. Stireman, John O. Stireman   +2 more
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Egg Load Evolution in Parasitoids

The American Naturalist, 2000
Parasitic wasps lay their eggs in or on other insects. Allocation of resources to reproduction (eggs) and survival (life span) should maximize reproductive success, but stochasticity in the number of hosts encountered precludes an exact match of allocation with reproductive opportunity.
Jan G. Sevenster, Gerard Driessen, Jacintha Ellers   +2 more
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