نتایج جستجو برای: nutrient resource

تعداد نتایج: 278576  

2003
G. A. Alloush W. M. Clapham

Grazing livestock create localized nutrient patches that increase soil ionic strength (IS) and influence plant productivity. The ability of plant root systems to control ion absorption and flux to xylem, and to sequester ions reaching leaf tissue in bound, nontoxic forms are means of minimizing IS. A greenhouse experiment was conducted to determine the growth and mineral acquisition responses o...

2010
Hagai Shemesh Adi Arbiv Mordechai Gersani Ofer Ovadia Ariel Novoplansky

Plants have been recognized to be capable of allocating more roots to rich patches in the soil. We tested the hypothesis that in addition to their sensitivity to absolute differences in nutrient availability, plants are also responsive to temporal changes in nutrient availability. Different roots of the same Pisum sativum plants were subjected to variable homogeneous and heterogeneous temporall...

2017
Jordi Boada Rohan Arthur David Alonso Jordi F Pagès Albert Pessarrodona Silvia Oliva Giulia Ceccherelli Luigi Piazzi Javier Romero Teresa Alcoverro

Predicting where state-changing thresholds lie can be inherently complex in ecosystems characterized by nonlinear dynamics. Unpacking the mechanisms underlying these transitions can help considerably reduce this unpredictability. We used empirical observations, field and laboratory experiments, and mathematical models to examine how differences in nutrient regimes mediate the capacity of macrop...

Journal: :Ecology 2016
Philip D McLoughlin Kenton Lysak Lucie Debeffe Thomas Perry Keith A Hobson

Sea-to-land nutrient transfers can connect marine food webs to those on land, creating a dependence on marine webs by opportunistic species. We show how nitrogen, imported by gray seals, Halichoerus grypus, and traced through stable isotope (δ15 N) measurements in marram grass, Ammophila breviligulata, significantly alters foraging behavior of a free-roaming megaherbivore (feral horses, Equus f...

2012
T. M. Mata M. Holyoak

Competition for limited resources is considered a key factor controlling invasion success. Resource availability can be viewed in either the long or short-term. Long-term availability depends on the baseline nutrient availability in the ecosystem and how those conditions shape the ecological community. Short-term resource availability fl uctuates with disturbances that alter nutrient availabili...

Journal: :Journal of environmental quality 2011
Marney E Isaac Anthony A Kimaro

Agricultural intensification has had unintended environmental consequences, including increased nutrient leaching and surface runoff and other agrarian-derived pollutants. Improved diagnosis of on-farm nutrient dynamics will have the advantage of increasing yields and will diminish financial and environmental costs. To achieve this, a management support system that allows for site-specific rapi...

2011
Katrin Sieben Anneke D. Rippen Britas Klemens Eriksson

We tested joint effects of predator loss and increased resource availability on the grazers' trophic level and the propagation of trophic interactions in a benthic food web by excluding larger predatory fish from cages and manipulating nutrients in the coastal zone of the Baltic Sea. The combination of nutrient enrichment and excluding larger predators induced an increase in medium-sized predat...

Journal: :Physiological genomics 2006
Matthias Bauer Jörg D Katzenberger Anne C Hamm Melanie Bonaus Ingo Zinke Jens Jaekel Michael J Pankratz

The reallocation of metabolic resources is important for survival during periods of limited nutrient intake. This has an influence on diverse physiological processes, including reproduction, repair, and aging. One important aspect of resource allocation is the difference between males and females in response to nutrient stress. We identified several groups of genes that are regulated in a sex-b...

2013
Partha Dasgupta

Glossary Accounting prices Accounting or shadow prices are measures of the social opportunity cost of resource use. The accounting price of a resource is the increase in social wellbeing that would be enjoyed if a unit more of the resource was made available at no cost. Ecological functions The combinations of ecosystem component and ecosystem processes that enable ecosystems to support primary...

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