Results 371 to 380 of about 116,496 (411)
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Parasitoid aggregation and interference in host–parasitoid dynamics
Ecological Entomology, 20161. Parasitoids do not distribute themselves evenly among available patches, which has an important bearing on the dynamics of host–parasitoid interactions. This study examined the density‐dependent nature of aggregation of the parasitoid Dirhinus giffardii Silvestri on the oriental fruit fly host, Bactrocera dorsalis (Hendel) distributed among discrete
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Intrinsic inter- and intraspecific competition in parasitoid wasps.
Annual Review of Entomology, 2013Immature development of parasitoid wasps is restricted to resources found in a single host that is often similar in size to the adult parasitoid. When two or more parasitoids of the same or different species attack the same host, there is competition for
J. Harvey, E. Poelman, Toshiharu Tanaka
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Parasitoid Competition and the Dynamics of Host-Parasitoid Models
The American Naturalist, 1988The standard host-parasitoid models assume that each parasitized host yields the same number of parasitoid progeny; but in many parasitoid species, the number of progeny per host depends on the number of times that host was encountered. I present a family of new host-parasitoid models incorporating this encounter-density-dependent variability in ...
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Dynamic Complexities in a Host-Parasitoid System with Aggregated Parasitoid
2009 First International Conference on Information Science and Engineering, 2009The 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 +3 more
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Enhanced stability in host–parasitoid interactions with autoparasitism and parasitoid migration
Journal of Theoretical Biology, 2016Previous studies based on simple non-spatial model have suggested that autoparasitism, in which females develop as primary endoparasitoids of hosts while males develop at the expense of primary parasitoids, stabilizes host-parasitoid steady state. To date, however, how the stabilizing role of autoparasitism would be affected by more complex spatial ...
Yunxin Huang +5 more
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Dynamics of a host–parasitoid model with prolonged diapause for parasitoid
Communications in Nonlinear Science and Numerical Simulation, 2011Abstract In this paper, a host–parasitoid model with prolonged diapause for parasitoid is proposed and analyzed. The asymptotic stability analysis of the system is performed. For a biologically reasonable range of parameter values, the global dynamics of the system have been studied numerically.
Limin Zhang, Min Zhao, Min Zhao, Jun Zhu
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Dynamic complexities in a parasitoid-host-parasitoid ecological model
Chaos, Solitons & Fractals, 2009Abstract 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 +3 more
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Host/parasitoid interactions: critical timing of parasitoid-derived products
Journal of Insect Physiology, 1998Short-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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The impact of parasitoid emergence time on host–parasitoid population dynamics
Theoretical Population Biology, 2009We investigate the effect of parasitoid phenology on host-parasitoid population cycles. Recent experimental research has shown that parasitized hosts can continue to interact with their unparasitized counterparts through competition. Parasitoid phenology, in particular the timing of emergence from the host, determines the duration of this competition ...
Mark A. Lewis +2 more
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Teratocytes and their functions in parasitoids
Current Opinion in Insect Science, 2014Some 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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