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Kawatsu K. Unraveling emergent network indeterminacy in complex ecosystems: A random matrix approach. Proc Natl Acad Sci U S A 2024; 121:e2322939121. [PMID: 38935564 PMCID: PMC11228516 DOI: 10.1073/pnas.2322939121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 05/31/2024] [Indexed: 06/29/2024] Open
Abstract
Indeterminacy of ecological networks-the unpredictability of ecosystem responses to persistent perturbations-is an emergent property of indirect effects a species has on another through interaction chains. Thus, numerous indirect pathways in large, complex ecological communities could make forecasting the long-term outcomes of environmental changes challenging. However, a comprehensive understanding of ecological structures causing indeterminacy has not yet been reached. Here, using random matrix theory (RMT), we provide mathematical criteria determining whether network indeterminacy emerges across various ecological communities. Our analytical and simulation results show that indeterminacy intricately depends on the characteristics of species interaction. Specifically, contrary to conventional wisdom, network indeterminacy is unlikely to emerge in large competitive and mutualistic communities, while it is a common feature in top-down regulated food webs. Furthermore, we found that predictable and unpredictable perturbations can coexist in the same community and that indeterminate responses to environmental changes arise more frequently in networks where predator-prey relationships predominate than competitive and mutualistic ones. These findings highlight the importance of elucidating direct species relationships and analyzing them with an RMT perspective on two fronts: It aids in 1) determining whether the network's responses to environmental changes are ultimately indeterminate and 2) identifying the types of perturbations causing less predictable outcomes in a complex ecosystem. In addition, our framework should apply to the inverse problem of network identification, i.e., determining whether observed responses to sustained perturbations can reconstruct their proximate causalities, potentially impacting other fields such as microbial and medical sciences.
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Affiliation(s)
- Kazutaka Kawatsu
- Graduate School of Life Sciences, Tohoku University, Sendai 980-8578, Japan
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2
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Srednick G, Swearer SE. Understanding diversity-synchrony-stability relationships in multitrophic communities. Nat Ecol Evol 2024; 8:1259-1269. [PMID: 38839850 DOI: 10.1038/s41559-024-02419-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 04/22/2024] [Indexed: 06/07/2024]
Abstract
Understanding how species loss impacts ecosystem stability is critical given contemporary declines in global biodiversity. Despite decades of research on biodiversity-stability relationships, most studies are performed within a trophic level, overlooking the multitrophic complexity structuring natural communities. Here, in a global analysis of diversity-synchrony-stability (DSS) studies (n = 420), we found that 74% were monotrophic and biased towards terrestrial plant communities, with 91% describing stabilizing effects of asynchrony. Multitrophic studies (26%) were representative of all biomes and showed that synchrony had mixed effects on stability. To explore potential mechanisms, we applied a multitrophic framework adapted from DSS theory to investigate DSS relationships in algae-herbivore assemblages across five long-term tropical and temperate marine system datasets. Both algal and herbivore species diversity reduced within-group synchrony in both systems but had different interactive effects on species synchrony between systems. Herbivore synchrony was positively and negatively influenced by algal diversity in tropical versus temperate systems, respectively, and algal synchrony was positively influenced by herbivore diversity in temperate systems. While herbivore synchrony reduced multitrophic stability in both systems, algal synchrony only reduced stability in tropical systems. These results highlight the complexity of DSS relationships at the multitrophic level and emphasize why more multitrophic assessments are needed to better understand how biodiversity influences community stability in nature.
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Affiliation(s)
- Griffin Srednick
- National Centre for Coasts and Climate, School of BioSciences, The University of Melbourne, Melbourne, Victoria, Australia.
| | - Stephen E Swearer
- Oceans Institute, University of Western Australia, Perth, Western Australia, Australia
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3
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Terrestrial food web of the Malpelo Fauna and Flora Sanctuary, Colombia: An analysis from a topological approach. ECOL INFORM 2023. [DOI: 10.1016/j.ecoinf.2023.102074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2023]
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4
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Awender S, Wackerbauer R, Breed GA. Stability of generalized ecological-network models. CHAOS (WOODBURY, N.Y.) 2021; 31:023106. [PMID: 33653073 DOI: 10.1063/5.0029934] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 01/14/2021] [Indexed: 06/12/2023]
Abstract
The stability of ecological networks of varying topologies and predator-prey relationships is explored by applying the concept of generalized modeling. The effects of omnivory, complexity, enrichment, number of top predators, and predatory response are discussed. The degree of omnivory plays a large role in governing web stability at steady state. Complexity as measured from connectance and network size is not a perfect indicator of stability; large, highly connected webs can be just as stable as smaller, less connected ones. Learning behavior as expressed in Holling's type III predatory response is stabilizing for food webs and provides exceptions to the paradox of enrichment for some topologies.
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Affiliation(s)
- Stefan Awender
- Department of Physics, University of Alaska Fairbanks, Fairbanks, Alaska 99775, USA
| | - Renate Wackerbauer
- Department of Physics, University of Alaska Fairbanks, Fairbanks, Alaska 99775, USA
| | - Greg A Breed
- Department of Biology and Wildlife, University of Alaska Fairbanks, Fairbanks, Alaska 99775, USA
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Pal S, Ghorai S, Banerjee M. Effect of kernels on spatio-temporal patterns of a non-local prey-predator model. Math Biosci 2019; 310:96-107. [DOI: 10.1016/j.mbs.2019.01.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 01/31/2019] [Accepted: 01/31/2019] [Indexed: 11/28/2022]
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6
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Wang X, Zhang G, Lai J. Dynamics of an intraguild predation model with an adaptive IGpredator. Math Biosci 2018; 302:19-26. [PMID: 29870769 DOI: 10.1016/j.mbs.2018.05.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Revised: 05/27/2018] [Accepted: 05/29/2018] [Indexed: 11/28/2022]
Abstract
In this paper, an intraguild predation model with an adaptive IGpredator is studied. IGpredator is assumed to adopt adaptive predation strategy to gain more fitness and the adaptive strength is variable. The existence and stability of the boundary equilibria and interior equilibrium are analyzed and it is found that the adaptive strength of IGpredator does not affect the stability of the boundary equilibria while it may change the stability of the interior equilibrium. Then we investigate numerically the effects of adaptive intraguild predation on the community structure along a gradient in environment productivity and find that it is possible for the appearance of the paradox of enrichment for intermediate speed of adaptivity. We also explore numerically how the dynamics of the adaptive system are affected by the adaptive strength of IGpredator. It is shown that the stationary coexistence of three species is stable when adaptation is strong and that a periodic solution with large amplitude appears when adaptation is weak, which implies that the adaptive activity of IGpredator to improve its fitness may lead to extinction of itself.
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Affiliation(s)
- Xiaoli Wang
- School of Mathematics and Statistics, Southwest University, Chongqing 400715, PR China
| | - Guohong Zhang
- School of Mathematics and Statistics, Southwest University, Chongqing 400715, PR China.
| | - Ju Lai
- School of Mathematics and Statistics, Southwest University, Chongqing 400715, PR China
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Sen D, Ghorai S, Banerjee M. Complex dynamics of a three species prey-predator model with intraguild predation. ECOLOGICAL COMPLEXITY 2018. [DOI: 10.1016/j.ecocom.2018.02.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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8
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Lin JJ, Yang TH. Traveling wave solutions for a diffusive three-species intraguild predation model. INT J BIOMATH 2018. [DOI: 10.1142/s1793524518500225] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aim of this work is to investigate the existence and non-existence of traveling wave solutions for a diffusive three-species intraguild predation model which means that one predator can eat its potential resource competitors. The method of upper–lower solution is implemented to show the existence of traveling wave solutions. In order to simplify the construction of an admissible pair of upper–lower solution, the scheme of strictly contracting rectangle is applied. Finally, the minimal speed [Formula: see text] of traveling wave solutions of the model is characterized. If the wave speed is greater than [Formula: see text], we show the existence of traveling wave solutions connecting trivial and positive equilibria by combining the upper and lower solutions with the contracting rectangle. On the other hand, if the wave speed is less than [Formula: see text], the non-existence of such solutions is also established. Furthermore, to illustrate our theoretical results, some numerical simulations are performed and biological meanings are interpreted.
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Affiliation(s)
- Jian-Jhong Lin
- General Education Center, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Ting-Hui Yang
- Department of Mathematics, Tamkang University, Tamsui Dist., New Taipei City 25137, Taiwan
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The effects of oil palm plantations on the functional diversity of Amazonian birds. JOURNAL OF TROPICAL ECOLOGY 2016. [DOI: 10.1017/s0266467416000377] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Abstract:Oil palm plantations are rapidly expanding in tropical areas, although the nature of the impacts on the functional roles of the different species in the ecosystem is poorly understood. The present study is the first assessment of how oil palm affects the functional diversity of birds in the Brazilian Amazon and tests the hypothesis that converting forest to oil palm decreases functional diversity of bird communities, selecting species more tolerant to environmental disturbances. We conducted point counts to survey bird communities in 16 plots in the eastern Amazon. We sampled 32 points in riparian forest, 128 in oil palm and 160 in forested habitats. To test whether the conversion of forest into oil palm plantations affects functional diversity of birds we calculated the FD (Functional Diversity) and FRic (Functional Richness) indices. To examine whether oil palm plantations select species functionally more similar than expected by chance we used a null model (SES.FD). FD was significantly higher in the forest plots in comparison with riparian forests and oil palm, and lower in oil palm when compared with riparian forests. FRic, in turn, was greater in forest plots than in oil palm and in riparian forest. These results show that the conversion of forested areas to oil palm represents a great loss of functional strategies. The SES values indicate that in forested habitats bird communities tend to be functionally clustered while in the oil palm they are functionally overdispersed. The functional traits most affected by oil palm were those associated with diet and foraging stratum. In short, oil palm plantations reduced functional diversity of birds, although the presence of riparian forests within the plantations and the fragments of forest adjacent are extremely important for the maintenance of ecosystem services.
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Pujoni DGF, Maia-Barbosa PM, Barbosa FAR, Fragoso Jr. CR, van Nes EH. Effects of food web complexity on top-down control in tropical lakes. Ecol Modell 2016. [DOI: 10.1016/j.ecolmodel.2015.10.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Gauzens B, Legendre S, Lazzaro X, Lacroix G. Intermediate predation pressure leads to maximal complexity in food webs. OIKOS 2015. [DOI: 10.1111/oik.02627] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- Benoit Gauzens
- UMR 6553 Ecobio, Univ. de Rennes 1, Avenue du Général Leclerc, Campus de Beaulieu; FR-35042 Rennes Cedex France
| | - Stéphane Legendre
- UMR 8197 IBENS (CNRS, ENS), École Normale Supérieure, 46, rue d'Ulm; FR-75230 Paris cedex 05 France
| | - Xavier Lazzaro
- UMR BOREA-MNHN/CNRS 7208/IRD 207/UPMC, Muse um National d'Histoire Naturelle, CP 53, 61 rue Buffon; FR-75231 Paris Cedex 5 France
- LCA/UMSA, La Paz; Bolivia
| | - Gérard Lacroix
- UMR iEES Paris (CNRS, UPMC, INRA, IRD, AgroParisTech, UPEC), Inst. of Ecology and Environmental sciences - Paris, Univ. Pierre et Marie Curie; 7 quai St.-Bernard FR-75005 Paris France
- UMS 3194 CEREEP - Ecotron IDF (CNRS, ENS); 78 rue du Château FR-77140 Saint-Pierre-Lès-Nemours France
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12
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Aresco MJ, Travis J, MacRae PSD. Trophic Interactions of Turtles in a North Florida Lake Food Web: Prevalence of Omnivory. COPEIA 2015. [DOI: 10.1643/ce-13-130] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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14
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Ikegawa Y, Ezoe H, Namba T. Effects of generalized and specialized adaptive defense by shared prey on intra-guild predation. J Theor Biol 2015; 364:231-41. [PMID: 25218868 DOI: 10.1016/j.jtbi.2014.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 08/28/2014] [Accepted: 09/02/2014] [Indexed: 10/24/2022]
Abstract
Intra-guild predation (IGP), predation on consumers which share common prey with the predators, is an important community module to understand a mechanism for persistence of complex food webs. However, classical theory suggests that persistence of an IGP system is unlikely particularly at high productivity, while empirical data do not support the prediction. Recently, adaptive defense by shared prey has been recognized to enhance coexistence of species and stability of the system. Some organisms having multiple predators in IGP systems employ two types of defenses; generalized defense that is effective against multiple predators and specialized one that is effective against only a specific predator species. We consider an IGP model including shared prey that can use the two types of defenses in combination against the consumer or omnivore. Assuming that the shared prey can change the allocation of defensive effort to increase its fitness, we show that the joint use of two types of adaptive defenses promotes three species coexistence and enhances stability of the IGP system when the specialized defense is more effective than the generalized one. When the system is unstable, a variety of oscillations appear and both the population densities and defensive efforts or only the population densities oscillate. Joint use of defenses against the consumer tends to increase the equilibrium population density of the shared prey with the defense efficiencies. In contrast, efficient generalized and specialized defenses against the omnivore often decrease the prey population. Consequently, adaptive defense by shared prey may not necessarily heighten the population size of the defender but sometimes increases densities of both the attackers and defender in IGP systems.
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Affiliation(s)
- Yusuke Ikegawa
- Graduate School of Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai 599-8531, Japan.
| | - Hideo Ezoe
- Graduate School of Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai 599-8531, Japan
| | - Toshiyuki Namba
- Graduate School of Science, Osaka Prefecture University, Gakuen-cho 1-1, Naka-ku, Sakai 599-8531, Japan
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15
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Bondavalli C, Bodini A. How interaction strength affects the role of functional and redundant connections in food webs. ECOLOGICAL COMPLEXITY 2014. [DOI: 10.1016/j.ecocom.2014.09.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Shchekinova EY, Löder MG, Boersma M, Wiltshire KH. Facilitation of intraguild prey by its intraguild predator in a three-species Lotka–Volterra model. Theor Popul Biol 2014; 92:55-61. [PMID: 24325813 DOI: 10.1016/j.tpb.2013.11.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2012] [Revised: 11/09/2013] [Accepted: 11/24/2013] [Indexed: 11/24/2022]
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17
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Shchekinova EY, Löder MGJ, Wiltshire KH, Boersma M. Stable coexistence in a Lotka-Volterra model with heterogeneous resources and intraguild predation. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:062721. [PMID: 24483500 DOI: 10.1103/physreve.88.062721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2013] [Indexed: 06/03/2023]
Abstract
In this study we model population dynamics in a three-species food web with heterogeneous resources and intraguild predation by using a nonspatial Lotka-Volterra system with a density-dependent interaction of resource items. The model consists of two predators with an intraguild predation (IGP) relation competing for a common resource. The resource is subdivided into subpopulations of different quality that are distinguished by grazing rates of the two predators, contact rates between subpopulations and mortality rates. The proposed system describes an exchange of traits between species from distinct subpopulations by using a species interaction term. In particular, we examine the percentage of stable coexistence solutions versus resource carrying capacity and contact rates between distinct resource pools. We also present a numerical comparison of the percentage of stable food webs found for different numbers of subpopulations. While at high enrichment no stable coexistence was found in the IGP system with a single resource, our model predicts a stable coexistence of two IGP-related predators and resources at high and intermediate enrichment already at a low contact rate between subpopulations.
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Affiliation(s)
- Elena Y Shchekinova
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar und Meeresforschung, Biologische Anstalt Helgoland, Kurpromenade 201, D-27498 Helgoland, Germany
| | - Martin G J Löder
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar und Meeresforschung, Biologische Anstalt Helgoland, Kurpromenade 201, D-27498 Helgoland, Germany
| | - Karen H Wiltshire
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar und Meeresforschung, Biologische Anstalt Helgoland, Kurpromenade 201, D-27498 Helgoland, Germany
| | - Maarten Boersma
- Alfred-Wegener-Institut Helmholtz-Zentrum für Polar und Meeresforschung, Biologische Anstalt Helgoland, Kurpromenade 201, D-27498 Helgoland, Germany
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Ågren GI, Stenberg JA, Björkman C. Omnivores as plant bodyguards—A model of the importance of plant quality. Basic Appl Ecol 2012. [DOI: 10.1016/j.baae.2012.07.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Kratina P, LeCraw RM, Ingram T, Anholt BR. Stability and persistence of food webs with omnivory: Is there a general pattern? Ecosphere 2012. [DOI: 10.1890/es12-00121.1] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Abrams PA. Simple life-history omnivory: responses to enrichment and harvesting in systems with intraguild predation. Am Nat 2011; 178:305-19. [PMID: 21828988 DOI: 10.1086/661243] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This article analyzes the nature of top-down and bottom-up effects and alternative states in systems characterized by life-history omnivory. The analysis is based on a three-species food web with intraguild predation (IGP). The top predator population has juvenile and adult stages, which consume the basal resource and the intermediate prey, respectively; the prey consumes only the resource. The per capita reproduction of the adult predators depends on their consumption rate of prey, while the maturation rate of the juvenile predators depends on their resource consumption rate. Enriching the resource can increase or decrease the abundances of one or both of the two consumer species; an increased density is more likely in the intermediate species than in the systems where IGP is not based on stage differences. Alternative states that have or lack the predator occur frequently, particularly when the prey population is capable of reducing the resource to very low densities. These results differ from those of several other recent models of life-history omnivory. They suggest that life-history omnivory may be one of the primary reasons why exploited populations undergo sudden collapses and why collapsed populations fail to recover in spite of large reductions in the exploitation rate.
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Affiliation(s)
- Peter A Abrams
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3G5, Canada.
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21
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Effects of local interaction range and mobility on the spatio-temporal dynamics of competing animals in uniform habitats. POPUL ECOL 2011. [DOI: 10.1007/s10144-011-0298-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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22
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Visser AW, Mariani P, Pigolotti S. Adaptive behaviour, tri-trophic food-web stability and damping of chaos. J R Soc Interface 2011; 9:1373-80. [PMID: 22090284 DOI: 10.1098/rsif.2011.0686] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We examine the effect of adaptive foraging behaviour within a tri-trophic food web with intra-guild predation. The intra-guild prey is allowed to adjust its foraging effort so as to achieve an optimal per capita growth rate in the face of realized feeding, predation risk and foraging cost. Adaptive fitness-seeking behaviour of the intra-guild prey has a stabilizing effect on the tri-trophic food-web dynamics provided that (i) a finite optimal foraging effort exists and (ii) the trophic transfer efficiency from resource to predator via the intra-guild prey is greater than that from the resource directly. The latter condition is a general criterion for the feasibility of intra-guild predation as a trophic mode. Under these conditions, we demonstrate rigorously that adaptive behaviour will always promote stability of community dynamics in the sense that the region of parameter space in which stability is achieved is larger than for the non-adaptive counterpart of the system.
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Affiliation(s)
- André W Visser
- Department of Marine Ecology and Aquaculture, National Institute for Aquatic Resources, Technical University of Denmark, Kavalergaarden 6, 2920 Charlottenlund, Denmark.
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Yeakel JD, Stiefs D, Novak M, Gross T. Generalized modeling of ecological population dynamics. THEOR ECOL-NETH 2011. [DOI: 10.1007/s12080-011-0112-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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25
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Pautasso M, Moslonka-Lefebvre M, Jeger MJ. The number of links to and from the starting node as a predictor of epidemic size in small-size directed networks. ECOLOGICAL COMPLEXITY 2010. [DOI: 10.1016/j.ecocom.2009.10.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Urbani P, Ramos-Jiliberto R. Adaptive prey behavior and the dynamics of intraguild predation systems. Ecol Modell 2010. [DOI: 10.1016/j.ecolmodel.2010.08.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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27
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Indirect interactions in the microbial world: specificities and similarities to plant–insect systems. POPUL ECOL 2010. [DOI: 10.1007/s10144-010-0235-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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28
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29
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Abrams PA, Fung SR. Prey persistence and abundance in systems with intraguild predation and type-2 functional responses. J Theor Biol 2010; 264:1033-42. [DOI: 10.1016/j.jtbi.2010.02.045] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2009] [Accepted: 02/24/2010] [Indexed: 10/19/2022]
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30
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Omnivory by Planktivores Stabilizes Plankton Dynamics, but May Either Promote or Reduce Algal Biomass. Ecosystems 2010. [DOI: 10.1007/s10021-010-9327-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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31
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Martín González AM, Dalsgaard B, Olesen JM. Centrality measures and the importance of generalist species in pollination networks. ECOLOGICAL COMPLEXITY 2010. [DOI: 10.1016/j.ecocom.2009.03.008] [Citation(s) in RCA: 177] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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32
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Faria LDB, Costa MIDS. Omnivorous food web, prey preference and allochthonous nutrient input. ECOLOGICAL COMPLEXITY 2010. [DOI: 10.1016/j.ecocom.2009.08.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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van der Hammen T, de Roos AM, Sabelis MW, Janssen A. Order of invasion affects the spatial distribution of a reciprocal intraguild predator. Oecologia 2010; 163:79-89. [PMID: 20169453 PMCID: PMC2853694 DOI: 10.1007/s00442-010-1575-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2009] [Accepted: 01/21/2010] [Indexed: 11/30/2022]
Abstract
When intraguild predation is reciprocal, i.e. two predator species kill and feed on each other, theory predicts that well-mixed populations of the two species cannot coexist. At low levels of the shared resource, only the best competitor exists, whereas if the level of the common resource is high, the first species to arrive on a patch can reach high numbers, which prevents the invasion of the second species through intraguild predation. The order of invasion may therefore be of high importance in systems with reciprocal intraguild predation with high levels of productivity, with the species arriving first excluding the other species. However, natural systems are not well mixed and usually have a patchy structure, which gives individuals the possibility to choose patches without the other predator, thus reducing opportunities for intraguild predation. Such avoidance behaviour can cause spatial segregation between predator species, which, in turn, may weaken the intraguild interaction strength and facilitate their co-occurrence in patchy systems. Using a simple set-up, we studied the spatial distribution of two reciprocal intraguild predators when either of them was given priority on a patch with food. We released females of two predatory mite species sequentially and found that both species avoided patches on which the other species was resident. This resulted in partial spatial segregation of the species and thus a lower chance for the two species to encounter each other. Such behaviour reinforces segregation, because heterospecifics avoid patches with established populations of the other species. This may facilitate coexistence of two intraguild predators that would exclude each other in well-mixed populations.
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Affiliation(s)
- Tessa van der Hammen
- Section of Population Biology, IBED, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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Li KY, Liu ZW, Gu BH. Density-dependent effects of snail grazing on the growth of a submerged macrophyte, Vallisneria spiralis. ECOLOGICAL COMPLEXITY 2009. [DOI: 10.1016/j.ecocom.2009.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Rikvold PA. Complex dynamics in coevolution models with ratio-dependent functional response. ECOLOGICAL COMPLEXITY 2009. [DOI: 10.1016/j.ecocom.2009.08.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Lazzaro X, Lacroix G, Gauzens B, Gignoux J, Legendre S. Predator foraging behaviour drives food-web topological structure. J Anim Ecol 2009; 78:1307-17. [PMID: 19619219 DOI: 10.1111/j.1365-2656.2009.01588.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
1. The structure and dynamics of prey populations are shaped by the foraging behaviours of their predators. Yet, there is still little documentation on how distinct predator foraging types control biodiversity, food-web architecture and ecosystem functioning. 2. We experimentally compared the effects of model fish species of two major foraging types of lake planktivores: a size-selective visual feeder (bluegill), and a filter feeder (gizzard shad). The visual feeder forages on individually captured consumer prey, whereas the filter feeder forages on various prey simultaneously, not only consumers but also primary producers. We ran a 1-month mesocosm experiment cross-classifying a biomass gradient of each predator type. We analysed the effect of each fish on food-web architecture by computing major topological descriptors over time (connectance, link density, omnivory index, etc.). These descriptors were computed from 80 predator-prey binary matrices, using taxa mostly identified at the species level. 3. We found that the visual feeder induced more trophic cul-de-sac (inedible) primary-producer species, lower link density and connectance, and lower levels of food-web omnivory and generalism than the filter feeder. Yet, predator biomass did not affect food-web topology. 4. Our results highlight that top-predator foraging behaviour is a key functional trait that can drive food-web topology and ultimately ecosystem functioning.
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Affiliation(s)
- Xavier Lazzaro
- UMR 7208 Borea, Centre National de la Recherche Scientifique, IRD, UPMC, MNHN, CP 53, Paris cedex 5, France.
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Takimoto G, Spiller DA, Post DM. ECOSYSTEM SIZE, BUT NOT DISTURBANCE, DETERMINES FOOD‐CHAIN LENGTH ON ISLANDS OF THE BAHAMAS. Ecology 2008; 89:3001-3007. [DOI: 10.1890/07-1990.1] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 05/15/2008] [Accepted: 05/28/2008] [Indexed: 11/18/2022]
Affiliation(s)
- Gaku Takimoto
- Department of Biology, Faculty of Science, Toho University, Funabashi, Chiba 274-8510 Japan
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, Connecticut 06511 USA
| | - David A. Spiller
- Section of Evolution and Ecology, One Shields Avenue, University of California, Davis, California 95616-8755 USA
| | - David M. Post
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, Connecticut 06511 USA
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