Timescale Hierarchy Determines the Indirect Effects of Fluctuating Subsidy Inputs on In Situ Resources

Takimoto, Gaku; Iwata, Tomoya; Murakami, Masashi

doi:10.1086/595759

Cited by 66 publications

(98 citation statements)

References 49 publications

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“…These allochthonous resources, or resource subsidies, can strongly affect the abundance and space use of consumers in recipient ecosystems, with cascading effects on in situ resources [28,30,38,50,53]. However, the impact of resource subsidies on recipient communities can be affected by several factors, including the productivity of the donor and recipient habitats, amount of input, trophic level receiving the input, and temporal variability in subsidy input rates [29,37,55,58]. Not only the magnitude, but the direction of the indirect effect on in situ resources can vary.…”

Section: Discussionmentioning

confidence: 99%

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Effect of resource subsidies on predator–prey population dynamics: a mathematical model

Nevai

Gorder

2012

Journal of Biological Dynamics

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The influence of a resource subsidy on predator-prey interactions is examined using a mathematical model. The model arises from the study of a biological system involving arctic foxes (predator), lemmings (prey), and seal carcasses (subsidy). In one version of the model, the predator, prey and subsidy all occur in the same location; in a second version, the predator moves between two patches, one containing only the prey and the other containing only the subsidy. Criteria for feasibility and stability of the different equilibrium states are studied both analytically and numerically. At small subsidy input rates, there is a minimum prey carrying capacity needed to support both predator and prey. At intermediate subsidy input rates, the predator and prey can always coexist. At high subsidy input rates, the prey cannot persist even at high carrying capacities. As predator movement increases, the dynamic stability of the predator-prey-subsidy interactions also increases.

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Section: Discussionmentioning

confidence: 99%

“…The timing of subsidy availability in part of a habitat can result in mixed (i.e. positive and negative) indirect effects on an in situ resource that occurs throughout the habitat [58]. Allochthonous inputs can also have striking effects on larger food webs [13,28,29].…”

Section: Introductionmentioning

confidence: 99%

Effect of resource subsidies on predator–prey population dynamics: a mathematical model

Nevai

Gorder

2012

Journal of Biological Dynamics

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“…caves, headwater streams, and some small marine islands) can become unstable due to the increase in predator numbers [38,40]. The duration and magnitude of resource subsidy flux pulse, together with generation times and biomass of consumers and predators of those consumers, can determine community stability and possible dynamics [41][42][43].…”

Section: Research Articlementioning

confidence: 99%

Importance of Riparian Zone: Effects of Resource Availability at Land-water Interface

Xiang¹,

Zhang²,

Richardson³

2017

Riparian Ecology and Conservation

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Riparian zone provides a variety of resources to organisms, including availability of water and subsidies. Water availability in riparian areas influences species distribution and trophic interaction of terrestrial food webs. Cross-ecosystem subsidies as resource flux of additional energy, nutrients, and materials benefit riparian populations and communities (e.g. plants, spiders, lizards, birds and mammals). However, aquatic ecosystems and riparian zones are prone to anthropogenic disturbances, which change water availability and affect the flux dynamics of cross-system subsidies. Yet, we still lack sufficient empirical studies assessing impacts of disturbances of land use, climate change and invasive species individually and interactively on aquatic and riparian ecosystems through influencing subsidy resource availability. In filling this knowledge gap, we can make more effective efforts to protect and conserve riparian habitats and biodiversity, and maintain riparian ecosystem functioning and services.

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“…In turn, the reduced benthos resulted in markedly reduced insect emergence, a predictable decline in tetragnathid spider abundance, and a trophic cascade that increased biomass of streambed algae (Baxter et al 2004). These different forms of indirect effects, depending on whether predators are enclosed or free to move, fostered new ecological theory and modeling to incorporate these important elements of complexity in real food webs (Takimoto et al 2002(Takimoto et al , 2009). This feedback whereby empirical research does not simply respond by testing ecological theory, but indeed directs its development, is exactly the boundary that Gary Polis (1991) had proposed needed to be crossed.…”

Section: Linkages Between Terrestrial and Aquatic Ecosystems In Foresmentioning

confidence: 99%

Crossing boundaries: Shigeru Nakano's enduring legacy for ecology

Fausch

2017

Ecological Research

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Shigeru Nakano was a Japanese ecologist whose work crossed boundaries among subdisciplines in ecology, between aquatic and terrestrial habitats, and between different languages and cultures. He published his first paper in 1985 while still an undergraduate, and is well known for his early research on the individual behavior of stream salmonids in dominance hierarchies. Shortly after completing his Master's degree in 1987 he began collaborating with many graduate students and other scientists, including those from the US, and expanded his research to include factors controlling stream salmonid distribution and abundance across spatial scales ranging from local to landscape levels. In 1995 he moved to a research station in southwestern Hokkaido and began new collaborative research on interactions between forest and stream food webs. Nakano pioneered large-scale field experiments using greenhouses to sever the reciprocal fluxes of invertebrate prey between stream and riparian food webs. The strong direct and indirect effects of isolating these food webs from each other on organisms ranging from stream algae to fish, riparian spiders, and bats have revealed new linkages and explained phenomena that were previously unexplained. When combined with similar results from other investigators, they have created a paradigm shift in ecology. Shigeru Nakano was lost at sea in Baja California on March 27, 2000 at the age of 37, but key papers from his 15-year career set new standards for rigor, detail, and synthesis. They continue to be highly cited and inspire new research, and to foster new collaborations among Japanese and western scientists.

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Timescale Hierarchy Determines the Indirect Effects of Fluctuating Subsidy Inputs on In Situ Resources

Cited by 66 publications

References 49 publications

Effect of resource subsidies on predator–prey population dynamics: a mathematical model

Effect of resource subsidies on predator–prey population dynamics: a mathematical model

Importance of Riparian Zone: Effects of Resource Availability at Land-water Interface

Crossing boundaries: Shigeru Nakano's enduring legacy for ecology

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