نتایج جستجو برای: river ecosystem

تعداد نتایج: 162076  

2017
K. R. Koopman D.C.M. Augustijn A. M. Breure

Rivers are complex systems that involve various interacting hydrological, geo-morphological and ecological processes resulting in the provisioning of riverine ecosystem services. The latter are flows of goods and services from ecosystems to society, such as food, timber and drinking water. Quantification of ecosystem services can support environmental impact assessments or scenario analyses for...

2005
Jason Tan Chris Beers Ruchi Gupta Gautam Biswas

Our goal in this work has been to bring together the entertaining and flow characteristics of video game environments with proven learning theories to advance the state of the art in intelligent learning environments. We have designed and implemented an educational game, a river adventure. The adventure game design integrates the Neverwinter Nights game engine with our teachable agents system, ...

2012
Nina Welti Elisabeth Bondar-Kunze Gabriel Singer Michael Tritthart Sophie Zechmeister-Boltenstern Thomas Hein Gilles Pinay

Restoration measures of deteriorated river ecosystems generally aim at increasing the spatial heterogeneity and connectivity of these systems in order to increase biodiversity and ecosystem stability. While this is believed to benefit overall ecological integrity, consequences of such restoration projects on biogeochemical processes per se (i.e. ecosystem functioning) in fluvial systems are rar...

2014
Julian Damashek Jason M. Smith Annika C. Mosier Christopher A. Francis

Nitrogen pollution in coastal zones is a widespread issue, particularly in ecosystems with urban or agricultural watersheds. California's Sacramento-San Joaquin Delta, at the landward reaches of San Francisco Bay, is highly impacted by both agricultural runoff and sewage effluent, leading to chronically high nutrient loadings. In particular, the extensive discharge of ammonium into the Sacramen...

2013
L. Grapci-Kotori

As the WFD requires carrying out regular quality assessment of fish population, in the frame of this study sampling was done in 3 sites along Lumebardhi i Pejes river. A list of species composition is completed. Altogether 9 fish species and lamprey (Eudontomyzon stankokaramani) were present in catch. The classification of the ecological status is done by using EFI index. The Lumebardhi i Pejes...

2011
Edward J. S. Hearnshaw Jean-Marie Tompkins Ross Cullen

This paper develops a systematic assessment of the sustainability of ecosystem services provided by rivers impacted by water storage projects. Given the conflicting preferences amongst stakeholders and the incomplete, uncertain and contradictory understanding about river ecology it is recognized that managing water resources sustainably is a wicked problem. In order to address this wicked probl...

1999
Brian Richter

However, hydrologists and ecologists are still woefully incapable of answering the question, “How much hydrologic alteration is too much for an aquatic or riparian ecosystem?” This is not to say that we haven’t learned a great deal about the influence of hydrologic variation and extreme events on species and natural communities or key ecosystem processes such as nutrient transport and cycling. ...

2005
Ellen Wohl Paul L. Angermeier Brian Bledsoe G. Mathias Kondolf Larry MacDonnell David M. Merritt Margaret A. Palmer N. LeRoy Poff David Tarboton

[1] River restoration is at the forefront of applied hydrologic science. However, many river restoration projects are conducted with minimal scientific context. We propose two themes around which a research agenda to advance the scientific basis for river restoration can be built. First, because natural variability is an inherent feature of all river systems, we hypothesize that restoration of ...

2013
D.M Kennard M.J Pusey B.J Davies D. M. Warfe M. J. Kennard B. J. Pusey

The recruitment of wood from the riparian zone to rivers and streams provides a complex habitat for aquatic organisms and can influence both aquatic biodiversity and ecosystem function. The Daly River in the wet-dry tropics of northern Australia is a highly seasonal, perennially-flowing sand-bed river where surveys of river wood aggregations at the reach scale (~2 km) in 2008 and 2009 recorded ...

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