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About 1,304 papers for “Intraguild predation”

Parasites and intraguild predation

Melanie J. Hatcher, Alison M. Dunn · Cambridge University Press eBooks · 2011

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Cited by 0

Intraguild predation among aphidophagous predators

Éric Lucas · European Journal of Entomology · 2005

Since the publication of papers by Polis et al. (1989, 1992), intraguild predation (IGP) has been considered in numerous systems and a growing number of papers have been published, demonstrating the ubiquity and the importance of this interaction. It appears that aphidophagous guilds constitute especially favourable systems for IGP. Temporal and spatial distributions of aphids promote interactions, such as IGP, among natural enemies. However, despite extensive laboratory and field studies, several questions remain to be answered: Which traits of the different protagonists of the system may promote or hamper the occurrence of IGP? How do ants tending aphids modulate the interaction? How should one consider the "sub-lethal" effects (and the defensive mechanisms) associated with the risk of IGP? May IGP disrupt or enhance aphid control? These different issues are discussed by focusing on the predatory species in the complex system of aphidophagous guilds. It appears that, first, IGP may constitute one of the main forces influencing the structure and dynamics of aphidophagous guilds, and therefore it has to be taken into account in research studies, and second, because of the ephemeral nature of aphid colonies and the great number of species belonging to aphidophagous guilds, understanding all the implications of the interaction, both direct and indirect, constitutes a very complex task.

Cited by 171Open access

HABITAT STRUCTURE AFFECTS INTRAGUILD PREDATION

Janssen, Arne, Sabelis, Maurice W., Magalhães, Sara et al. · Figshare · 2016

Intraguild predation is thought to be ubiquitous in natural food webs. Yet, theory on intraguild predation predicts the intraguild prey to persist only under limited conditions. This gap between theory and empirical observations needs scrutiny. One reason might be that theory has focused on equilibrium dynamics and a limited set of species (usually three) that interact in well-mixed populations in unstructured habitats, and these assumptions will often not hold in natural systems. In this review, we focus on the effects of habitat structure on intraguild predation. Habitat structure could reduce encounter rates between predators and prey and could create refuges for prey. In both cases, habitat structure could reduce the strength of intraguild interactions, thereby facilitating species coexistence. A meta-analysis of studies on manipulation of habitat structure shows that intraguild prey indeed suffer less from intraguild predation in structured habitats. This was further confirmed by a meta-analysis in which studies on intraguild predation were classified according to habitat structure. Intraguild predation reduced densities of the intraguild prey significantly more in habitats with little structure than in habitats rich in structure. The effect of intraguild predation on the shared prey was negative, and not significantly affected by habitat structure. We conclude that habitat structure may increase persistence of the intraguild prey by decreasing the strength of the interaction between intraguild predator and intraguild prey.

Cited by 0Open access

Trophic supplements to intraguild predation

Matthew P. Daugherty, Jason P. Harmon, Cheryl J. Briggs · Oikos · 2007

Intraguild predation (IGP) is a dominant community module in terrestrial food webs that occurs when multiple consumers feed both on each other and on a shared prey. This specific form of omnivory is common in terrestrial communities and is of particular interest for conservation biology and biological control given its potential to disrupt management of threatened or pest species. Extensive theory exists to describe the dynamics of three‐species IGP, but these models have largely overlooked the potential for other, exterior interactions, to alter the dynamics within the IGP module. We investigated how three forms of feeding outside of the IGP module by intraguild predators (i.e. trophic supplementation) affect the dynamics of the predators (both IG predator and IG prey) and their shared resource. Specifically, we examined how the provision of a constant donor‐controlled resource, the availability of an alternative prey species, and predator plant‐feeding affect the dynamics of IGP models. All three forms of trophic supplements modified the basic expectations of IGP theory in two important ways, and their effects were similar. First, coexistence was possible without the IG prey being a superior competitor for the original shared resource if the IG prey could effectively exploit one of the types of trophic supplements. However, supplements to the IG predator restricted the potential for coexistence. Second, supplements to the IG prey ameliorated the disruptive effects of the IG predator on the suppression of the shared resource, promoting effective control of the resource in the presence of both predators. Consideration of these three forms of trophic supplementation, all well documented in natural communities, adds substantial realism and predictive power to intraguild predation theory.

Cited by 93

HABITAT STRUCTURE AFFECTS INTRAGUILD PREDATION

Arne Janssen, Maurice W. Sabelis, Sara Magalhães et al. · Ecology · 2007

Intraguild predation is thought to be ubiquitous in natural food webs. Yet, theory on intraguild predation predicts the intraguild prey to persist only under limited conditions. This gap between theory and empirical observations needs scrutiny. One reason might be that theory has focused on equilibrium dynamics and a limited set of species (usually three) that interact in well-mixed populations in unstructured habitats, and these assumptions will often not hold in natural systems. In this review, we focus on the effects of habitat structure on intraguild predation. Habitat structure could reduce encounter rates between predators and prey and could create refuges for prey. In both cases, habitat structure could reduce the strength of intraguild interactions, thereby facilitating species coexistence. A meta-analysis of studies on manipulation of habitat structure shows that intraguild prey indeed suffer less from intraguild predation in structured habitats. This was further confirmed by a meta-analysis in which studies on intraguild predation were classified according to habitat structure. Intraguild predation reduced densities of the intraguild prey significantly more in habitats with little structure than in habitats rich in structure. The effect of intraguild predation on the shared prey was negative, and not significantly affected by habitat structure. We conclude that habitat structure may increase persistence of the intraguild prey by decreasing the strength of the interaction between intraguild predator and intraguild prey.

Cited by 355

HABITAT STRUCTURE AFFECTS INTRAGUILD PREDATION

Janssen, Arne, Sabelis, Maurice W., Magalhães, Sara et al. · Figshare · 2016

Intraguild predation is thought to be ubiquitous in natural food webs. Yet, theory on intraguild predation predicts the intraguild prey to persist only under limited conditions. This gap between theory and empirical observations needs scrutiny. One reason might be that theory has focused on equilibrium dynamics and a limited set of species (usually three) that interact in well-mixed populations in unstructured habitats, and these assumptions will often not hold in natural systems. In this review, we focus on the effects of habitat structure on intraguild predation. Habitat structure could reduce encounter rates between predators and prey and could create refuges for prey. In both cases, habitat structure could reduce the strength of intraguild interactions, thereby facilitating species coexistence. A meta-analysis of studies on manipulation of habitat structure shows that intraguild prey indeed suffer less from intraguild predation in structured habitats. This was further confirmed by a meta-analysis in which studies on intraguild predation were classified according to habitat structure. Intraguild predation reduced densities of the intraguild prey significantly more in habitats with little structure than in habitats rich in structure. The effect of intraguild predation on the shared prey was negative, and not significantly affected by habitat structure. We conclude that habitat structure may increase persistence of the intraguild prey by decreasing the strength of the interaction between intraguild predator and intraguild prey.

Cited by 0Open access

Space dependent Intraguild predation population dynamics

Renato Botelho Junqueira de ANDRADE · UNESP Institutional Repository (São Paulo State University) · 2019

Muito é discutido dentro e fora do meio acadêmico a respeito do impacto que o desmatamento e a atividade humana de forma geral têm sobre a diversidade das paisagens naturais. Por se tratar de uma preocupação recente da perspectiva da escala de tempo da história da civilização, trata-se de um fenômeno cujos mecanismos ainda se encontram em pleno processo de esclarecimento, embora não haja dúvida de sua existência. Nesse contexto, as ferramentas matemáticas e computacionais podem fornecer contribuições substanciais para a sistematização e a descrição precisa das causas e efeitos envolvidos nesse processo, muitas vezes por meio de resultados importantes e pouco intuitivos. Por exemplo, podem-se criar modelos matemáticos que avaliem os efeitos da restrição de habitat nos chamados módulos de comunidade, fornecendo previsões relevantes para casos limite de sistemas biológicos reais. Apesar disso, ainda existem muitas lacunas teóricas na literatura subjacente. O seguinte trabalho procurou então contribuir para o caso particular do módulo de comunidade conhecido como Predação Intraguilda utilizando Equações Diferenciais Parciais do tipo Reação-Difusão. Após uma breve revisão bibliográfica de alguns modelos de Dinâmica de Populações, o estudo dessas equações se deu por métodos de aproximação das soluções. Além de integrações numéricas, utilizamos um método de aproximação baseado em princípios variacionais capaz de reproduzir os principais aspectos esperados das soluções das equações. A aproximação foi capaz de fornecer estimativas para tamanhos críticos de habitat para a coexistência das espécies envolvidas no modelo proposto de Predação Intraguilda. Adicionalmente, ela também capturou com eficiência a dependência do comportamento oscilatório do modelo em relação ao tamanho do habitat e fornece possíveis direções para eventuais trabalhos futuros.

Cited by 0Open access

Intraguild predation model (IGP) with disease

Ali Hassan, Aimi Nuraida · 2013

Intraguild Predation (IGP) classified as killing and eating among potential competitors. Intraguild Predation is ubiquitous interaction, differing from competition or predation. The purpose of this study is to investigate the effects of disease on the susceptible prey. Here we analyze the LotkaVolterra competition model and Intraguild Predation model. In order to keep the model simple, an assumption has been made that is no any migration or immigration for the intraguild predator and intraguild prey. We also analyze using the SI model, the simplest epidemiological model. We analyzed the entire model by finding the stability of the equilibrium points by using Routh – Hurwitz criteria. Numerical example is used to show the stability of the equilibrium point by using the MAPLE software.

Cited by 0

Modelling Intraguild Predation with Adaptive Behaviour

Simon R. Fung · TSpace (University of Toronto) · 2009

The thesis examines the dynamics of intraguild predation models incorporating adaptive behaviour. The top predator varies its relative consumption of the intermediate consumer and the basal resource. The consumer alters its activity level in response to the threat of predation. Incorporating these adaptive behaviours facilitated three species coexistence, but restricted omnivory by promoting the formation of three species food chains. Model modifications which promoted omnivory also tended to reduce three species coexistence. It is predicted that omnivory should be most common when the intermediate and the basal species are similarly profitable to the predator. The model also predicts two types of omnivory. Strong omnivory occurs when the predator always consumes intermediate amounts of both prey items. Weak omnivory occurs when the predator preys almost exclusively on one prey at most times, but rapidly switches to include the other when the relative abundance of that second prey exceeds a certain level.

Cited by 0Open access

Ontogenetic stage-specific reciprocal intraguild predation

Morgana Maria Fonseca, Ângelo Pallini, Eraldo Lima et al. · Oecologia · 2018

The size or stage of interacting individuals is known to affect the outcome of ecological interactions and can have important consequences for population dynamics. This is also true for intraguild predation (the killing and eating of potential competitors), where the size or ontogenetic stage of an individual determines whether it is the intraguild predator or the intraguild prey. Studying size- or stage-specific interactions is therefore important, but can be challenging in species with complex life histories. Here, we investigated predatory interactions of all feeding stages of the two predatory mite species Neoseiulus californicus and Phytoseiulus macropilis, both of which have complex life cycles, typical for predatory arthropods. Populations of these two species compete for two-spotted spider mites, their prey. We evaluated both the capacity to kill stages of the other predator species and the capacity to benefit from feeding on these stages, both prerequisites for the occurrence of intraguild predation. Ontogeny played a critical role in the occurrence of intraguild predation. Whereas the juveniles of P. macropilis developed from larva until adulthood when feeding on N. californicus eggs, interestingly, adult female P. macropilis did not feed on the smaller stages of the other species. We furthermore show that intraguild predation was reciprocal: both juveniles and adult females of N. californicus preyed on the smallest stages of P. macropilis. These results suggest that a proper analysis of the interactions between pairs of species involved in intraguild predation should start with an inventory of the interactions among all ontogenetic stages of these species.

Cited by 7Open access

Study of a diffusive intraguild predation model

Debjit Pal, Dipak Kesh, Debasis Mukherjee · Academia Environmental Sciences and Sustainability · 2025

The present study analyzes an intraguild predation model, which combines predation with competition. This model has food webs with a fundamental three-species structure in which two populations are associated not only by prey–predator relationships but also by the competition between them for a common prey. The growth of prey is assumed to follow the Smith growth function, and self-diffusion is taken into consideration under zero-flux boundary condition. The feasible equilibria and their stability in temporal system are explained. The stability of positive steady state (PSS) in the PDE system is also discussed. An a priori estimate for positive steady state (PSS) is performed with the help of Harnack’s inequality and maximum principle. Under certain conditions, the non-existence of non-constant PSS are obtained by the Poincare inequality, while the Leray–Schauder theory explains the emergence of non-constant PSS, which leads the system to develop stationary patterns. This article represents a theoretical framework that describes the creation of patterns for the intraguild predation model due to the movement of the species.

Cited by 1Open access