Sentences with phrase «food web models»

Accommodations: You may wish to provide some or all of your students with a word bank to create or revise their food web models.

Physiological based pharmacokinetic models (PBPK) have been incorporated into food web models to better predict tissue levels and effects on the individual organism.

First - of - its - kind analysis of hundreds of food web models shows that the decrease has mostly taken place since the 1970s

Not exact matches

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The theme will use a structured program of field sampling to generate information needed to develop and populate models of primary production and energy flow in Murray - Darling Basin food webs.

Course Description School Food Operational Models walks you through the complicated web of school food operations and how each operational model affects the food on the lunch tFood Operational Models walks you through the complicated web of school food operations and how each operational model affects the food on the lunch tfood operations and how each operational model affects the food on the lunch tfood on the lunch tray.

School Food Operational Models walks you through the complicated web of school food operations and how each operational model affects the food on the lunch tFood Operational Models walks you through the complicated web of school food operations and how each operational model affects the food on the lunch tfood operations and how each operational model affects the food on the lunch tfood on the lunch tray.

In their food - web modeling, Sahasrabudhe and Motter have used accepted ecological models of predator - prey relationships, but a more elaborate representation of an ecosystem would also include parasitism, seed dispersal, competition, mutualisms (in which species make life easier for each other), nutrient dynamics and more.

But, by modeling a variety of food webs using established ecological principles, the researchers were able to find such species and they hope that the algorithms that they created might eventually be able to identify target species in the real world.

In contrast, changing fishing practices — so that unwanted fish are no longer captured — had dramatic effects in the model which affected the entire food web, with major benefits for birds, mammals, and fish stocks.

Rochet has run theoretical models on the effects of fishing practices and has indeed found that selective fishing can negatively impact biodiversity and create ripples in the food web as the balance between predator and prey is upset.

The researchers, led by Villy Christensen of the University of British Columbia in Canada, analyzed models of about 200 food webs around the world.

Some have identified HSS» tri-level trophic model as a hypothetical construct because in the real world food webs are not so tidy and can have fewer or more than three levels.

The scientists developed a mixotrophic model of the global ocean food web, at the scale of marine plankton, in which they gave each plankton class the ability to both photosynthesize and consume prey.

«For each time slice, we used a «real» pre-extinction ecosystem full of the species we know existed to help create several alternate models of food webs for the same place and time.

The scientists decided to use a clever form of mathematical modeling to dig into the importance of these variables in (sometimes spotty) fossil food webs.

The researchers used satellite observations including determinations of net primary production (NPP)-- the net production of organic matter from aqueous carbon dioxide (CO2) by phytoplankton — to drive their food - web - based model.

They found both models showed a general feeding structure throughout the plankton food web: The smallest organisms were too small to ingest prey, while the largest plankton were poor competitors when living by photosynthesis.

«Ancient ecosystem response to «big five» mass extinction: Ingenious modeling shows that the stability of ancient ecosystems depended on species with important, big - picture roles in food web.»

The study's authors — including Peter Roopnarine, PhD, of the California Academy of Sciences — say inventive, cutting - edge modeling techniques helped highlight the critical importance of understanding food webs (knowing «who eats what») when trying to predict what communities look like before, during, and after a mass extinction.

Unlike previous ones, the new model showed that predator and prey populations fluctuate less in complex food webs — those with long food chains, omnivorous predators, and competing species of plant - eaters.

To resolve that dilemma, Hastings and postdoc Kevin McCann devised a mathematical model for six miniature food webs, each containing three or four predator and prey species that interacted in different ways.

The intricacies of these interactions have eluded attempts to construct realistic computer models of how food webs work — until now.

In the study published in the journal American Naturalist, researchers developed a model based on food web interactions among plants, grasshoppers, and spiders exposed to multiple changing climate variables.

But in the world of marine microbial ecology, there are very few model systems and associated tools that enable scientists to deeply explore the physiology, biochemistry, and ecology of marine microbes, which drive the ocean's elemental cycles, influence greenhouse gas levels, and support marine food webs.

Consequently, in the past 20 years his research has evolved from an early focus on prioritizing the effects that humans have on coral reefs and the role that marine protected areas play in conserving biological diversity and ecological processes, to developing theoretical and simulation models of coral reefs that will help predict and suggest alternatives to reduce detrimental effects, to developing practical means to restore degraded reefs through manipulation of the food web and management.

We analyze and model the flux of terrestrial materials from land to sea — the origins, pathways, processes, and food web consequences — in the context of long - term environmental change.

Biological - physical interaction; Numerical modeling; Lower - trophic level food web dynamics; Phytoplankton bloom dynamics and phenology; Zooplankton population dynamics; Mariculture and environmental capacity.

His research work includes topics such as Baltic Sea food webs, ecological modeling, bioaccumulation of harmful substances, assessment of populations of aquatic species with several methods including hydro - acoustics — and recently, underwater soundscapes and impacts of underwater noise on marine life.

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EcoMOD's learning goals in habitats and food webs are taught using a systems perspective, shifting the instructional focus from comprehension of static representations to consequential student interaction with dynamic computational models.

B. A. Menge, J. Lubchenco, S. D. Gaines and L. R. Ashkenas, A test of the Menge - Sutherland model of community organization in a tropical rocky intertidal food web, Oecologia (Berlin) 71:75 - 89, from p. 85 (1986).

The significant decline in the δ13C of limpets over the three time points provides evidence counter to a food web shift hypothesis (Fig 3a, linear mixed effects model, time coefficient = − 0.206, p = 0.009, n = 5).

Aydin, K. Y., G. A. McFarlane, J. R. King, B. A. Megrey, and K. W. Myers, 2005: Linking oceanic food webs to coastal production and growth rates of Pacific salmon (Oncorhynchus spp.), using models on three scales.

«Earth system models» include all that and much more: forests that can shrink or spread as conditions change; marine food webs that react as the oceans grow more acidic with carbon dioxide; and aerosol particles in the atmosphere that interact with greenhouse gases, enhancing or sapping their warming power.

Finally, the impacts of climate change on plant growth could alter ecological interactions among species with potential cascading effects on food webs; integrating changes in suitable plant growing days and NPP within recently developed General Ecosystem Models [40] could provide some insights into the magnitude of these changes.

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