Competition and stoichiometry: coexistence of two predators on one prey

Loladze, Irakli; Kuang, Yang; Elser, James J.; Fagan, William F.

doi:10.1016/s0040-5809(03)00105-9

Cited by 120 publications

(65 citation statements)

References 72 publications

(82 reference statements)

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“…This fact suggests that factors other than body P content play a role in vulnerability of consumer species to P deficient food. For example, even if the body P content is high, consumers can maintain the vitality under low P food if they have abilities to efficiently ingest and assimilate P from the food, and/or to efficiently recycle P acquired within the body for metabolisms as theoretically suggested by Hall (2004) and Loladze et al (2004). Recent studies have shown that food quality for herbivorous consumers in terms of nutritional content is not necessarily optimal in a variety of ecosystems including aquatic and terrestrial habitats (Elser et al 2000a, Fagan and Denno 2004, Raubenheimer et al 2009).…”

Section: Growth Response To Changes In Quantity and Elemental Composimentioning

confidence: 99%

Food quality and food threshold: implications of food stoichiometry to competitive ability of herbivore plankton

Iwabuchi

Urabe

2012

Ecosphere

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Citation: Iwabuchi, T., and J. Urabe. 2012. Food quality and food threshold: implications of food stoichiometry to competitive ability of herbivore plankton. Ecosphere 3(6):51. http://dx.doi.org/10.1890/ES12-00098.1Abstract. Exploitative competition for food resources is considered to be an important factor determining the dominant species in communities. In such a competition, a threshold food concentration (TFC), where the growth rate becomes zero, is crucial in determination of competitive outcomes. In addition, recent studies on ecological stoichiometry have suggested that the TFC of a species would differ due to changes in food elements that limit growth. If the magnitude of change in TFC differs between species, competitive superiority among species may also change. The experiments showed that the rank order of the species in TFC changed according to the P content of food, suggesting that competitively superior species can vary with elemental composition of food. These results imply that as well as quantity, the elemental composition of food is important in exploitative competition, and the changes in elemental composition of food may be critical to shape an entire community structure.

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Section: Growth Response To Changes In Quantity and Elemental Composimentioning

confidence: 99%

Food quality and food threshold: implications of food stoichiometry to competitive ability of herbivore plankton

Iwabuchi

Urabe

2012

Ecosphere

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“…While classic food-web studies have focused mainly on trophic interactions and energy fluxes (Elton, 1927;Lindeman, 1942) unraveling the effects of environmental feedbacks and environmental modification by organisms on biodiversity maintenance is a current focus in ecological research (de Ruiter et al, 2005;Harding, 1999;Hooper et al, 2005;Loladze et al, 2004;. We propose that organismal feedback-coupled interactions with the environment are likely critical components both for sustaining biodiversity in complex, multiple trophic level food webs and for altering their susceptibility to environmental stressors.…”

Section: Introductionmentioning

confidence: 96%

“…However, ecosystem function beyond the ''who-eats-whom'' of food-web dynamics is important to food-web studies (Moorcroft, 2003;Pascual, 2005) and potentially, as in the context of our work, to species persistence. While studies including biogeochemical considerations and ecological stoichiometric constraints (DeAngelis, 1992;Elser et al, 1998;Moe et al, 2005;Schlesinger, 1997;Sterner and Elser, 2002) do place organisms in dynamic physical-chemical environments, effects on multiple trophic level food-web dynamics are not typically addressed: small, often analytically tractable, systems are in focus (Daufresne and Loreau, 2001a, b;Grover, 2003;Hall et al, 2006;Kuijper et al, 2004;Loladze et al, 2004). We still lack a basic understanding of how environmental feedbacks impact the dynamics and persistence of structurally realistic food webs.…”

Section: Introductionmentioning

confidence: 99%

Biodiversity maintenance in food webs with regulatory environmental feedbacks

Bagdassarian

Dunham

Brown

et al. 2007

Journal of Theoretical Biology

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Although the food web is one of the most fundamental and oldest concepts in ecology, elucidating the strategies and structures by which natural communities of species persist remains a challenge to empirical and theoretical ecologists. We show that simple regulatory feedbacks between autotrophs and their environment when embedded within complex and realistic food-web models enhance biodiversity. The food webs are generated through the niche-model algorithm and coupled with predator-prey dynamics, with and without environmental feedbacks at the autotroph level. With high probability and especially at lower, more realistic connectance levels, regulatory environmental feedbacks result in fewer species extinctions, that is, in increased species persistence. These same feedback couplings, however, also sensitize food webs to environmental stresses leading to abrupt collapses in biodiversity with increased forcing. Feedback interactions between species and their material environments anchor food-web persistence, adding another dimension to biodiversity conservation. We suggest that the regulatory features of two natural systems, deep-sea tubeworms with their microbial consortia and a soil ecosystem manifesting adaptive homeostatic changes, can be embedded within niche-model food-web dynamics. r

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“…However, such systems do not possess a componentwise positive equilibrium [34] and thus no stable equilibrium is possible [31]. Moreover, system (1.2), exhibiting Armstrongand McGehee-type coexistence is only weakly persistent, but not persistent.…”

Section: Introductionmentioning

confidence: 99%

“…To have the strong version of coexistence, researchers have taken various other factors into account when modeling competition, such as interspecific interference [45,46], spatial heterogeneity [5], stoichiometric principles [34], etc. Another important factor is intraspecific interference within a population of competitors, which includes aggressive displays, posturing, fighting, infanticide, and cannibalism [30].…”

Section: Introductionmentioning

confidence: 99%

Coexistence in competition models with density-dependent mortality

Ruan

Ardito

Ricciardi

et al. 2007

Comptes Rendus. Biologies

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We consider a two-competitor/one-prey model in which both competitors exhibit a general functional response and one of the competitors exhibits a density-dependent mortality rate. It is shown that the two competitors can coexist upon the single prey.As an example, we consider a two-competitor/one-prey model with a Holling II functional response. Our results demonstrate that density-dependent mortality in one of the competitors can prevent competitive exclusion. Moreover, by constructing a Liapunov function, the system has a globally stable positive equilibrium.

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Competition and stoichiometry: coexistence of two predators on one prey

Cited by 120 publications

References 72 publications

Food quality and food threshold: implications of food stoichiometry to competitive ability of herbivore plankton

Food quality and food threshold: implications of food stoichiometry to competitive ability of herbivore plankton

Biodiversity maintenance in food webs with regulatory environmental feedbacks

Coexistence in competition models with density-dependent mortality

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