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• W830206780 abstract "Intraguild predation is a widespread interaction between species and can strongly influence communities composition. It occurs when two consumers which share a common resource, and hence compete, also engage into predation. The consumer which can prey on its competitor is often referred to as the intraguild predator while the other is called intraguild prey. In this work we investigate some theoretical aspects about these interactions. First we analyse an experiment with predatory mites which was carried to test patterns of exclusion along a productivity gradient, predicted by theory. Although this experiment was carefully designed to test the theoretical assertions, their results do not agree with theory. Through a very simple model for intraguild predation which serves as a representation of that system, we show that: if the short-term dynamics is taken into account rather than only equilibrium states, in which the usual theory is based, and we consider that populations that attain levels very close to zero are extinct, experimental results meet theory. Then we study questions concerning the influence of different life stages of individuals on the dynamics of intraguild predation. We introduce a model with stage structure in both consumers and consider predation occurring only from adults of the intraguild predator on juveniles of the intraguild prey. This stage dependent interaction was believed to have great effects on the dynamics, once predation pressure on the intraguild prey is reduced, and has been proposed as one feature that could promote coexistence. We check the outcomes of the system along a productivity gradient and show that stage structure do not induce great qualitative changes on the dynamics and the more likely resulting dynamics continues being the extinction of one of the consumers. Predation between consumers can also be reciprocal and this phenomenon is ubiquitous in many systems. In the last part of this work we study a model for reciprocal intraguild predation in a stage structured system. Increasing the attack rates of that consumer which was initially the intraguild prey on the intraguild predator we find that a reciprocal intraguild predation system has a great potential for alternative states in which each consumer can persist isolated with resource, initial conditions determining what consumer will persist." @default.
• W830206780 created "2016-06-24" @default.
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• W830206780 date "2011-02-23" @default.
• W830206780 modified "2023-09-26" @default.
• W830206780 title "Theoretical perspectives on the dynamics of communities with intraguild predation" @default.
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