Intraguild Predation, Invertebrate Predators, and Trophic Cascades in Lake Food Webs

Hart, Deborah R.

doi:10.1006/jtbi.2002.3053

Cited by 72 publications

(57 citation statements)

References 88 publications

(133 reference statements)

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“…Second, at high productivities, the IG predator tends to outcompete the IG prey, leading to extinction of the latter, as shown by the same authors. Further, in combination with predator-dependent functional responses, a food web with IG predation is unlikely to show trophic cascades (Hart 2002). The work of Kuijper et al (2003) shows that, when the link between the IG predator and the basic resource is weak, IG predation has a stabilizing effect on the food-web dynamics.…”

Section: Mechanistic Theory and Community Structurementioning

confidence: 99%

Population dynamic theory of size–dependent cannibalism

Claessen

Roos

Persson

2004

Proc. R. Soc. Lond. B

230

219

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Cannibalism is characterized by four aspects: killing victims, gaining energy from victims, size-dependent interactions and intraspecific competition. In this review of mathematical models of cannibalistic populations, we relate the predicted population dynamic consequences of cannibalism to its four defining aspects. We distinguish five classes of effects of cannibalism: (i) regulation of population size; (ii) destabilization resulting in population cycles or chaos; (iii) stabilization by damping population cycles caused by other interactions; (iv) bistability such that, depending on the initial conditions, the population converges to one of two possible stable states; and (v) modification of the population size structure. The same effects of cannibalism may be caused by different combinations of aspects of cannibalism. By contrast, the same combination of aspects may lead to different effects. For particular cannibalistic species, the consequences of cannibalism will depend on the presence and details of the four defining aspects. Empirical evidence for the emerged theory of cannibalism is discussed briefly. The implications of the described dynamic effects of cannibalism are discussed in the context of community structure, making a comparison with the community effects of intraguild predation.

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Section: Mechanistic Theory and Community Structurementioning

confidence: 99%

Population dynamic theory of size–dependent cannibalism

Claessen

Roos

Persson

2004

Proc. R. Soc. Lond. B

230

219

View full text Add to dashboard Cite

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“…Ecologists have also strongly focused on the biotic and abiotic factors that explain variation in cascade strengths within certain types of ecosystems (Power et al 1992, Polis and Strong 1996, Chase 2003. Potential explanations for variation in the strength of community-wide trophic cascades include predator species diversity (Finke and Denno 2004, Bruno and O'Connor 2005, Byrnes et al 2006, Snyder et al 2006, herbivore species diversity (Schmitz et al 2000), intraguild predation (McCann et al 1998, Hart 2002, refuges against intraguild predation Denno 2002, 2006), and heterogeneity in edibility within trophic levels (Leibold 1989, Power et al 1992, Bell 2002). …”

Section: Introductionmentioning

confidence: 99%

Induced Defenses in Herbivores and Plants Differentially Modulate a Trophic Cascade

Stap

Vos

Verschoor

et al. 2007

Ecology

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Abstract. Inducible defenses are dynamic traits that modulate the strength of both plantherbivore and herbivore-carnivore interactions. Surprisingly few studies have considered the relative contributions of induced plant and herbivore defenses to the overall balance of bottom-up and top-down control. Here we compare trophic cascade strengths using replicated two-level and three-level plankton communities in which we systematically varied the presence or absence of induced defenses at the plant and/or herbivore levels. Our results show that a trophic cascade, i.e., significantly higher plant biomass in three-level than in two-level food chains, occurred whenever herbivores were undefended against carnivores. Trophic cascades did not occur when herbivores exhibited an induced defense. This pattern was obtained irrespective of the presence or absence of induced defenses at the plant level. We thus found that herbivore defenses, not plant defenses, had an overriding effect on cascade strength. We discuss these results in relation to variation in cascade strengths in natural communities.

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“…Omnivory, defined as the feeding on nonadjacent trophic levels and found to be widespread in nature (Polis et al, 1989), is a relevant topic of this sort of investigation. It has been studied with respect to conditions for coexistence, nutrient enrichment, behavioural, top-down and bottom-up effects (Holt and Polis, 1997;Diehl and Feibel, 2000;Hart, 2002;Kuijper et al, 2003), amongst others.…”

Section: Introductionmentioning

confidence: 99%

The interplay among prey preference, nutrient enrichment and stability in an omnivory system

Faria

Costa

2009

Braz. J. Biol.

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Food webs usually display an intricate mix of trophic interactions where multiple prey are common. In this context omnivory has been the subject of intensive analysis regarding food web stability and structure. In a three species omnivory setting it is shown that the modeling of prey preference by the top predator may exert a strong influence on the short as well as on the long term dynamics of the respective food web. Clearly, this has implications concerning the stability and the structure of omnivory systems under disturbances such as nutrient enrichment.Keywords: omnivory, stability, prey preference, nutrient enrichment. Interação entre preferência alimentar, enriquecimento de nutrientes e estabilidade em uma onivoria ResumoRedes tróficas apresentam geralmente uma variada rede de interações onde múltiplas presas são comuns. Neste contexto, a onivoria vem sendo objeto de intensas análises à luz da estabilidade e estrutura do sistema. A modelagem do termo de preferência pelo predador de topo sobre suas presas pode exercer uma forte influência sobre as dinâmicas transiente e de longo prazo em uma rede trófica onívora composta por três espécies. Claramente, isto tem implicações sobre a estrutura e estabilidade do sistema sob distúrbios tais como o enriquecimento por nutrientes.Palavras-chave: onivoria, estabilidade, preferência alimentar, enriquecimento de nutrientes.

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Intraguild Predation, Invertebrate Predators, and Trophic Cascades in Lake Food Webs

Cited by 72 publications

References 88 publications

Population dynamic theory of size–dependent cannibalism

Population dynamic theory of size–dependent cannibalism

Induced Defenses in Herbivores and Plants Differentially Modulate a Trophic Cascade

The interplay among prey preference, nutrient enrichment and stability in an omnivory system

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