The environment affects population dynamics through multiple drivers. Here we explorea simplified version of such influence in a three-species food chain, making use of the Hastings-Powell model. This represents an idealized resource-consumer-predator chain, or equivalently, avegetation-host-parasitoid system. By stochastically perturbing the value of some parameters inthis dynamical system, we observe dramatic modifications in the system behavior. In particular,we show the emergence of on-off intermittency, i.e., an irregular alternation between stable phasesand sudden bursts in population size, which hints towards a possible conceptual description ofpopulation outbursts grounded into an environment-driven mechanism.
On-Off Intermittency in a Three-Species Food Chain
Vissio G
;Provenzale A
2021
Abstract
The environment affects population dynamics through multiple drivers. Here we explorea simplified version of such influence in a three-species food chain, making use of the Hastings-Powell model. This represents an idealized resource-consumer-predator chain, or equivalently, avegetation-host-parasitoid system. By stochastically perturbing the value of some parameters inthis dynamical system, we observe dramatic modifications in the system behavior. In particular,we show the emergence of on-off intermittency, i.e., an irregular alternation between stable phasesand sudden bursts in population size, which hints towards a possible conceptual description ofpopulation outbursts grounded into an environment-driven mechanism.File | Dimensione | Formato | |
---|---|---|---|
prod_455476-doc_176034.pdf
accesso aperto
Descrizione: On-Off Intermittency in a Three-Species Food Chain. Mathematics 2021, 9, 1641. https://doi.org/10.3390/math9141641
Tipologia:
Versione Editoriale (PDF)
Licenza:
Creative commons
Dimensione
6.05 MB
Formato
Adobe PDF
|
6.05 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.