Impact of Intraguild Predation and Stage Structure on Simple Communities along a Productivity Gradient

Abstract

Impact of intraguild predation and stage structure on simple communities along a productivity gradient Mylius, S.D.; Klumpers, K.; de Roos, A.M.; Persson, L. Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. abstract: We analyze the consequences of intraguild predation and stage structure for the possible composition of a three-species community consisting of resource, consumer, and predator. Intraguild predation, a special case of omnivory, induces two major differences with traditional linear food chain models: the potential for the occurrence of two alternative stable equilibria at intermediate levels of resource productivity and the extinction of the consumer at high productivities. At low productivities, the consumer dominates, while at intermediate productivities, the predator and the consumer can coexist. The qualitative behavior of the model is robust against addition of an invulnerable size class for the consumer population and against addition of an initial, nonpredatory stage for the predator population, which means that the addition of stage structure does not change the pattern. Unless the top predator is substantially less efficient on the bottom resource, it tends to drive the intermediate species extinct over a surprisingly large range of productivities, thus making coexistence generally impossible. These theoretical results indicate that the conditions for stable food chains involving intraguild predation cannot involve strong competition for the bottommost resource.

How Plants Benefit from Providing Food to Predators Even When It Is Also Edible to Herbivores

“…However, these same models showed that systems that have a stable equilibrium lose one of its components when omnivory becomes stronger or when basal productivity increases. Mylius et al (2001) showed that invulnerable prey stages in the prey or noncarnivorous stages in the predator, has only minor effects on the parameter domain where predator and prey can coexist at equilibrium. Our study, based on similarly structured populations, now shows that another mechanism, adaptive behaviors in prey and predator in a spatially heterogeneous environment, greatly facilitates stable coexistence.…”

A coupled plankton–anchovy population dynamics model assessing nonlinear controls of anchovy and gelatinous biomass in the Black Sea

“…Diehl & Feibel 2000, Mylius et al 2001, Fig. 13 revealed 4 distinct regimes of the zooplankton-anchovy-gelatinous system.…”

“…In contrast, the tri-trophic level model given by Mylius et al (2001; hereafter referred to as MKRP model) described a different structure. The consumer (predator) population density decreased (increased) only slightly over a broader range of the carrying capacity in the high consumer-low predator state and became extinct abruptly at the threshold of low consumer-high predator state (Fig.…”

“…3). This structure is a more complex version of the classical 3-component intraguild system that was studied for its stability properties (Holt & Polis 1997, Hart 2002, Revilla 2002 and response characteristics to changing resource carrying capacity (Diehl & Feibel 2000, Mylius et al 2001, Kuijper et al 2003, van de Wolfshaar et al 2006. Gelatinous predation on anchovy eggs and larvae may be interpreted as the wasp-waist control (Bakun 2006).…”

Stage-structured cannibalism with delay in maturation and harvesting of an adult predator

“…Symmetric IGP occurs when there is mutual predation between two species, whereas in asymmetrical interaction, one species consistently preys upon the other. Stage-structure with cannibalism among predators competing for the same resource is asymmetric intraguild predation [5,6].…”