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Topic: Lotic ecosystem

	Aquatic ecosystem - Wikipedia, the free encyclopedia
		Marine ecosystems can be divided into the following zones: oceanic (the relatively shallow part of the ocean that lies over the continental shelf); profundal (bottom or deep water); benthic (bottom substrates); intertidal (the area between high and low tides); estuaries; salt marshes; coral reefs; and hydrothermal vents (where chemosynthetic sulphur bacteria form the food base).
		This is a specific type of freshwater ecosystem that is largely based on the autotrophic algae which provide the base trophic level for all life in the area.
		Aquatic ecosystems are also used for human recreation, and are very important to the tourism industry, especially in coastal regions.
	en.wikipedia.org /wiki/Aquatic_ecosystem (1058 words)

	Ecology (Site not responding. Last check: 2007-10-31)
		The ecosystem is composed of two entities, the entirety of life (called the biocenose) and the medium that life exists in (the biotope).
		Within the ecosystem, species are connected and dependent upon one another in the food chain, and exchange energy and matter between themselves and with their environment.
		It was in 1935 that Arthur Tansley, the British ecologist, coined the term ecosystem, the interactive system established between the biocenose (the group of living creatures), and their biotope, the environment in which they live.
	www.nebulasearch.com /encyclopedia/article/Ecology.html (4495 words)

	Lotic Environment Lesson Plans
		Freshwater ecosystems are divided into two groups, lentic or standing water habitats, and lotic or running water habitats.
		The artificial system may also serve as a model for a naturally occurring ecosystem that may be difficult for the class to travel to on a regular basis.
		If this ecosystem is not meant to mimic a naturally occurring local river, the model river may be seeded with purchased or raised cultures of micro-organisms.
	www.accessexcellence.org /AE/AEPC/WWC/1991/lotic.html (1492 words)

	Background Info
		The major difference between a lotic ecosystem and a lentic ecosystem is the persistent flow of water in a lotic ecosystem.
		The hydrologic cycle describes the continuum of the transfer of water from precipitation to surface water and ground water, to storage and runoff, and to the eventual return to the atmosphere by transpiration and evaporation.
		The river continuum concept (RCC) is an attempt to construct a synthetic framework to describe the function of lotic ecosystems from source to mouth, and to accommodate
	www.uwm.edu /People/ehlinger/background_information.htm (799 words)

	Abstracts
		The major sensitivities of aquatic ecosystems are their permanence and even existence in the face of potential reduced net basin supply of water, stability of geomorphic structure and riparian ecotones with alterations in disturbance regimes, and water quality changes due to modified water balance.
		In all of these respects, aquatic ecosystems of the region also are sensitive to the extensive modifications imposed by human use of water resources, which underscores the difficulty of separating this type of anthropogenic change from climate change.
		Lotic ecosystems should properly be viewed as expanding, contracting, and fragmenting habitats; this spatial dynamic is as fundamental to streams as is discharge.
	www.public.asu.edu /~sfisher/stream_lab/abstracts.html (7917 words)

	Conservation Ecology: Ecosystem Modeling for Evaluation of Adaptive Management Policies in the Grand Canyon
		This model examines ecosystem variables and processes at multiple scales in space and time, ranging from feet and hours for benthic algal response to diurnal flow changes, to reaches and decades for sediment storage and dynamics of long-lived native fish species.
		The Colorado River ecosystem in Grand Canyon is a spectacular river corridor from Glen Canyon Dam to Lake Mead.
		One of the nastiest computational problems in river ecosystems is representation of gains and losses of materials and energy suspended in the water column, as water moves rapidly downstream (sediments, detritus, drifting insects, and temperature).
	www.ecologyandsociety.org /vol4/iss2/art1 (15298 words)

	Course Readings
		The hierarchical organization of the aquatic ecosystem: an outline of how reductionism and holism may be reconciled.
		Implications of streamflow variability and predictability for lotic community structure: a regional analysis of streamflow patterns.
		Ecosystem metabolism and turnover of organic carbon along a flwater river continuum.
	faculty.plattsburgh.edu /tim.mihuc/env4332000S/readings.htm (536 words)

	Paradise Creek
		Creeks, along with streams and rivers, are one of the primary links between terrestrial ecosystems and lentic (aquatic) ecosystems, dissolving chemicals and materials in the drainage basin and contributing it to the "down-hill" flow into the Pacific Ocean.
		The functioning ecosystem is not just the creek, however, it is the drainage area surrounding the creek as well as the local atmosphere above it, from which the creek could not be isolated and survive.
		Signs of ecosystem health include the homeorhesis of the system (after Waddington), the stability of the system (that is, its resilience after stress, such as floods), the diversity of its components, the continuous recycling of elements, and flourishing.
	www.uidaho.edu /e-journal/pan_eco/pev11n2para.html (14098 words)

	Session 5 (Site not responding. Last check: 2007-10-31)
		Management of lotic waters into lentic ecosystem has become a necessity to mankind’s endeavor to have better quality of life.
		Since a few decades conversion of natural ecosystem into manmade or engineered ecosystem has increased tremendously as the agrarian and industrialized societies need water for their multifarious activities.
		With the current developmental phase every ecosystem is changing fast and exert immense influence on the flora and fauna, geographical and geological structures, hydrological features may be flood related, environmental related which in itself may be natural or artificial, technology related or co-inhabitant related.
	ces.iisc.ernet.in /energy/Lake2002abs/ses52.html (854 words)

	DAMS, FISH AND FISHERIES- Opportunities, challenges and conflict resolution
		The extent to which fisheries can be developed, sustained or protected along riverine ecosystems modified by dams reflects basin topography, geological features, watershed hydrology, and climate, as well as engineering features of the dam itself, and operational programmes for retention and release of water from the reservoir, through the dam and into the tailwaters.
		Subsequently, river ecosystems containing dams must contend with secondary environmental pressures such as increases in pollution as well as increased exploitation and extraction of their resources (primarily water, fish, and substrates), that are independent from and in addition to the direct influences of dams and reservoirs on the physical and biological dimensions of the system.
		Fish yields from floodplain river ecosystems are directly related to the height and duration of floods (Holcik and Bastl, 1977; Goulding, 1980; Welcomme, 1985; Jackson and Ye, 2000; Jackson, in press).
	www.fao.org /DOCREP/004/Y2785E/y2785e02.htm (5130 words)

	Robert J. Naiman—Curriculum Vitae
		Structure and dynamics of lotic ecosystems, landscape ecology, and the role of large animals in influencing ecosystem dynamics.
		Importance of detrital carbon to the estuarine ecosystem.
		Influence of spatial-temporal heterogeneity and background disturbance regime on the recovery of lotic ecosystems.
	www.fish.washington.edu /people/naiman/cv.html (4660 words)

	Streamhome and intro (Site not responding. Last check: 2007-10-31)
		In this case the lotic ecosystem for the classroom is no exception.
		The purpose of this brief paper is to help you see the uses, challenges and advantages of building and maintaining a classroom lotic ecosystem.
		The stream ecosystem model is an effective classroom tool for developing students knowledge and abilities in the area of biology.
	www.augusta.k12.wi.us /HS/dept/sci/stream.htm (302 words)

	Proceedings of the second international symposium on the management of large rivers for fisheries: Volume II
		Floodplains fall into the wetland category, which includes ecosystems at the interface of aquatic and terrestrial ecosystems and are therefore often called ecotones.
		However, large wetlands have to be considered as specific ecosystems with unique properties not adequately covered by present ecological paradigms and by limnology, estuarine ecology and terrestrial ecology (Mitsch and Gosselink 2000).
		Various conceptual approaches independent of (or complementary to) the RCC and FPC were developed in the 1980s and 1990s on lotic ecosystem structure and functioning.
	www.fao.org /docrep/007/ad526e/ad526e0c.htm (11029 words)

	DLESE Find a Resource > Grade range: 6-8
		They will be able to infer why the brown alga, Sargassum, is likely to be home to many marine organisms, and that the populations of organisms in the Sargassum are dependent on each other for survival.
		The amount of oil remaining in the ecosystem and the remaining impact of the spill are covered next.
		Then transition of the ecosystem is described as it gradually recovers.
	www.dlese.org /dds/browse_gr_05-2490.htm (732 words)

	Conservation Ecology: Linking keystone species and functional groups: a new operational definition of the keystone ... (Site not responding. Last check: 2007-10-31)
		Thus, it links the identity of a KS to a specific ecosystem process that can be quantified and experimentally falsified, which was suggested by Martinez (1995, 1996) as an important consideration in any attempt to measure the functional significance of biodiversity in ecosystems.
		This viewpoint agrees with the suggestion of Schulze (1995) that control of ecosystem processes may be shared by a variety of KS that act at multiple trophic levels within grazer and detritus food chains.
		Dayton (1975) concluded that the ecosystem importance of keystone species has no relation to their rank abundance or biomass because they are "rare and/or small." Although this view of nature may hold within the context of the ecosystem as a whole, as discussed above, it is incorrect when viewed from the perspective of functional groups.
	sunsite.wits.ac.za /eco/vol7/iss1/resp11/main.html (5206 words)

	ASLO: Programs for Recent PhDs
		Ecosystem dynamics of protists and bacteria in a lotic wetland ecosystem.
		A Lotic Microcosm for Ecological and Ecotoxicological Studies on Benthic Macroinvertebrates.
		Stable Nitrogen Isotopes in Adirondack Forest and Aquatic Ecosystems.
	www.aslo.org /phd/dialog1995.html (581 words)

	USGS - Elwha River - Project Summaries
		Erosion of deltas in Lake Mills and Lake Aldwell, the reservoirs formed by the dams, will produce elevated levels of suspended sediment in the river, which is the primary source of water for the City of Port Angeles.
		The transport of sediment and its effects on aquatic habitat during and after dam removal are among the most important issues in restoring the Elwha River ecosystem.
		In order to manage the Elwha River during the process of restoration and evaluate the eventual success of the restoration effort, it is important to evaluate its present ecological status.
	wa.water.usgs.gov /projects/elwha/summary.htm (1479 words)

	A Stream Ecosystem in the Classroom
		To begin the use of the stream model (if you have built it, if not the first activity for the students could be to build it) a brainstorming session around the topic of "what an ecosystem needs to function" can be held in class.
		After the class has generated ideas on what the basic components of an ecosystem are, you can get to the task of having the class design the "parts" of your classroom stream ecosystem.
		All of the projects regardless of their level of sophistication were successful based on the fact that student research was conducted and results presented in classroom stream research symposiums.
	www.accessexcellence.org /AE/AEC/AEF/1995/tweed_ecosystem.html (1612 words)

	Pages 1--3 from Untitled
		Knowledge of factors regulating nitrogen cycling in streams is integral to understanding lotic ecosystem structure and function (Meyer et al.
		The role of lotic ecosystems in the response of the biosphere to anthropogenic change has been largely ignored by the scientific community.
		Results of these empirical studies will be used to test site-specific model predictions as well as to develop a generalized conceptual model of the factors controlling N cycling in lotic ecosystems.
	www.biol.vt.edu /faculty/webster/linx/n15pro.html (7584 words)

	OLD GROWTH VS - NABS99 Communication
		Forest harvesting through the practice of clear cutting has strong impacts on lotic ecosystem functioning.
		While benthic communities may recover in a matter of years, other aspects of the ecosystem may remain altered for many decades.
		In this study, we compared the structure and function of headwater streams in an old growth forest (n=3) with those (n=3) in an adjacent forested catchment of 75 yr second growth.
	www.benthos.org /database/nabstracts99.cfm/ID/84 (234 words)

	AFS Policy Statement #31d: Management of Pacific Rockfish (Site not responding. Last check: 2007-10-31)
		While these ecosystem enhancements are generally incidental to the purposes for which dams were constructed, there are instances when dams have been constructed primarily for the purpose of ecosystem enhancement.
		It attempts to look at ecosystem quality from a salmon’s perspective and to recommend remediations that would move the system from its present state to an ideal state for salmon life history and production.
		Effects of the spawning migration of the alewife, Alosa pseudoharengus, on freshwater ecosystems.
	www.fisheries.org /html/Public_Affairs/Policy_Statements/ps_32.shtml (15981 words)

	Proceedings of the Oklahoma Academy of Science
		A bioassessment provides valuable biological data and is a direct measure of a lotic ecosystem or biotic community health (1).
		A stream ecosystem's water quality and health can be estimated by examining fish and macroinvertebrate communities and completing a habitat evaluation (2,3).
		This estimate allows the researcher to avoid using resources for chemical-specific analyses on streams identified by their biota as non-impaired by water quality effects, and thus is a cost-effective and ecologically relevant means to assess stream health.
	digital.library.okstate.edu /oas/oas_htm_files/v80/p61_70.html (3059 words)

	Who Is CSE: Kenneth Commins
		Cummins, K. Factors limiting the microdistribution of the caddisflies Psycnopsyche lepida (Hager) and Pycnopsyche guttifer (Walker) in a Michigan stream (Trichoptera: Limnephillidae).
		Organic enrichment with leaf leachate in experimental lotic ecosystems.
		Cummins, K.W. The river continuum and riparian influence concepts as paradigms for examining agriculturally influenced stream ecosystems Pp.
	www.naturestudy.org /whois/publications.htm (1566 words)

	Determining Rates of Change and Evaluating Group-Level Resiliency Differences in Hyporheic Microbial Communities in ...
		Böckelmann, D. Description and characterization of bacteria attached to lotic organic aggregates (river snow) in the Elbe River of Germany and the South Saskatchewan River of Canada.
		Phylogenetic composition, spatial structure, and dynamics of lotic bacterial biofilms investigated by fluorescent in situ hybridization and confocal laser scanning microscopy.
		Contribution of the hyporheic zone to ecosystem metabolism in a prealpine gravel-bed river.
	aem.asm.org /cgi/content/full/70/8/4756 (6381 words)

	CV Keck
		IN Biology of Particles in Aquatic Ecosystems, R.
		Community studies in an old growth stream ecosystem in the Mobile River Basin, Alabama, USA.
		A preliminary analysis of hydrodynamic characteristics of a small lotic wetland ecosystem.Verh.
	bama.ua.edu /~mward/vitae/webcv020416.htm (859 words)

	UGA Entomology \| Athens Faculty \| Bruce Wallace
		These areas include: effects of disturbance on stream ecosystems; organic matter dynamics in streams; secondary production and ecology of aquatic invertebrates; manipulation of stream food webs; invertebrate community structure in streams; and, role of aquatic invertebrates in stream ecosystem processes.
		Biotic indices and stream ecosystem processes: results from an experimental study.
		The role of macroinvertebrates in stream ecosystem function.
	entomology.ent.uga.edu /personnel/faculty/wallace.htm (395 words)

	[No title] (Site not responding. Last check: 2007-10-31)
		The significance of seed bank dynamics to plant recruitment and regeneration is widely recognized, especially in areas where disturbance drives ecosystem processes.
		As the frequency of natural flooding increases longitudinally in regulated river systems, the Serial Discontinuity Hypothesis suggests that lotic ecosystem processes will return to conditions resembling a pre-regulated state.
		We conclude that managing for pre-dam conditions, which is the desired state for national parks, requires a very different flooding regime than managing for greatest biodiversity.
	abstracts.co.allenpress.com /pweb/esa2000/abstracts/MAR-3-69-51.html (273 words)

	Eco-metrics, Inc. - Poole 2002 (Site not responding. Last check: 2007-10-31)
		The paradigm is useful for addressing fundamental attributes of lotic ecosystems, such as heterogeneity, hierarchy, directionality, and process feedback occurring across spatial scales, and for illustrating spatio-temporal linkages between disparate concepts in lotic system ecology such as the River Continuum Concept, the Serial Discontinuity Concept, the Flood Pulse Concept, and the Hyporheic Corridor Concept.
		Such models can simulate how the structure and function of lotic ecosystems are influenced strongly by landscape context (the ecological conditions within which the system is set) and the metastructure (structural characteristics and juxtaposition) of finer-scale patches comprising the system.
		A simple object-oriented, multi-scale, discontinuum model of solute transformation and biological response along a stream channel illustrates how changing the branching pattern of a stream and/or the arrangement of its component patches along the downstream profile will result in substantial changes in predicted patterns of solute concentration and biotic community structure.
	www.eco-metrics.com /content/view/28/9 (334 words)

	Mark D. Johnson, Ph.D. (Site not responding. Last check: 2007-10-31)
		Johnson, M. Ecosystem Dynamics of Protists and Bacteria in a Lotic Wetland Ecosystem.
		A Comparison of Microbial Ecosystem Dynamics in an Alder Thicket Wetland and a Mixed Hardwood / Conifer Forest Stream.
		The Effect of Habitat on Relative Activity of Bacteria in Stream Ecosystems.
	www.sjc.edu /content.cfm/pageid/1126 (386 words)

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