scholarly journals Dynamical consequences of optimal host feeding on host-parasitoid population dynamics

1997 ◽  
Vol 59 (5) ◽  
pp. 809-831 ◽  
Author(s):  
Vlastimil Křivan
Keyword(s):  
Population Dynamics ◽  
Host Feeding ◽  
Parasitoid Population

The impact of parasitoid emergence time on host–parasitoid population dynamics

2009 ◽  
Vol 75 (2-3) ◽  
pp. 201-215 ◽  
Author(s):  
Christina A. Cobbold ◽  
Jens Roland ◽  
Mark A. Lewis
Keyword(s):  
Population Dynamics ◽  
Emergence Time ◽  
Parasitoid Population ◽  
The Impact

scholarly journals Artificial nighttime light changes aphid-parasitoid population dynamics

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Dirk Sanders ◽  
Rachel Kehoe ◽  
Katie Tiley ◽  
Jonathan Bennie ◽  
Dave Cruse ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Aphid Parasitoid ◽  
Parasitoid Population ◽  
Nighttime Light

scholarly journals Global redistribution and local migration in semi-discrete host-parasitoid population dynamic models

2019 ◽  
Author(s):  
Brooks Emerick ◽  
Abhyudai Singh
Keyword(s):  
Population Dynamics ◽  
Functional Response ◽  
Dynamic Models ◽  
Constant Density ◽  
Spatial Effects ◽  
Modeling Framework ◽  
Type Iii ◽  
Stable Coexistence ◽  
Vulnerable Period ◽  
Parasitoid Population

ABSTRACTHost-parasitoid population dynamics is often probed using a semi-discrete/hybrid modeling framework. Here, the update functions in the discrete-time model connecting year-to-year changes in the population densities are obtained by solving ordinary differential equations that mechanistically describe interactions when hosts become vulnerable to parasitoid attacks. We use this semi-discrete formalism to study two key spatial effects: local movement (migration) of parasitoids between patches during the vulnerable period; and yearly redistribution of populations across patches outside the vulnerable period. Our results show that in the absence of any redistribution, constant density-independent migration and parasitoid attack rates are unable to stabilize an otherwise unstable host-parasitoid population dynamics. Interestingly, inclusion of host redistribution (but not parasitoid redistribution) before the start of the vulnerable period can lead to stable coexistence of both species. Next, we consider a Type-III functional response (parasitoid attack rate increases with host density), where the absence of any spatial effects leads to a neutrally stable host-parasitoid equilibrium. As before, density-independent parasitoid migration by itself is again insufficient to stabilize the population dynamics and host redistribution provides a stabilizing influence. Finally, we show that a Type-III functional response combined with density-dependent parasitoid migration leads to stable coexistence, even in the absence of population redistributions. In summary, we have systematically characterized parameter regimes leading to stable/unstable population dynamics with different forms of spatial heterogeneity coupled to the parasitoid’s functional response using mechanistically formulated semi-discrete models.

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