Author: K.P. FINLAYPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Spatial and temporal variability in water temperatures in the littoral zone of a multibasin lake
Author: K.P. FINLAYCanadian Journal of Fisheries and Aquatic Sciences
Author: Spatial and Temporal Variation in Water Chemistry and Littoral Benthic Macroinvertebrate Communities of Precambrian Shield Lakes
Author: Jennifer LentoPublisher:
ISBN:
Category : Acid pollution of rivers, lakes, etc
Languages : en
Pages : 392
Book Description
Environmental Drivers of Spatial and Temporal Variability in Lakes
Author: Mark David ScheuerellPublisher:
ISBN:
Category : Lake animals
Languages : en
Pages : 318
Book Description
Spatial and Temporal Patterns in Aquatic Ecosystems
Author: Thomas O'KeefeWater Temperature Characteristics of Lakes Subjected to Climate Change
Author: Midhat HondzoPublisher:
ISBN:
Category : Climatic changes
Languages : en
Pages : 514
Book Description
A deterministic, one dimensional, unsteady lake water temperature model was modified and validated to simulate the seasonal (spring to fall) temperature statification structure over a wide range of lake morphometries, trophic and meteorological conditions. Model coefficients related to hypolimnetic eddy diffusivity, light attenuation, wind sheltering, ad convective heat transfer were generalized using theoretical and empirical extensions. Propagation of uncertainty in the lake temperature model was studied using a vector state-space method. The output uncertainty was defined as the result of deviations of meteorological variables from their mean values. Surface water temperatures were affected by uncertain meteorological forcing. Air temperture and dew point temperature fluctuations had significant effects on lake temperature uncertainty. The method presents a useful alternative for studying long-term averages and variability of the water temperature structure in lakes due to variable meteorological forcing. The lake water temperature model was linked to a daily meteorological data base to simulate daily water temperature in several specific lakes as well as 27 lake classes characteristic for the north central US. Case studies of lake water temperature and stratification response to variable climate were made in a particulary warm year (1988) and a more normal one (1971). A regional analysis was conducted for 27 lake classes over a period of twenty-five years (1955-1979). Output from a global climate model (GISS) was used to modify te meteorological data base to account for a doubling of atmospheric CO2. The simulations predict that after climate change: 1) epilimnetic water temperatures will be higher but will increase less than air temperature, 2) hypolimnetic temperatures in seasonally stratified dimictic lakes will be largely unchanged and in some cases lower than at present, 3) evaporative water loss will be increased by as much as 300 mm for the open water season, 4) onset of stratification will occur earlier and overturn will occur later in the season, and 5) overall lake stability will become greater in spring and sumer.
Anthropogenic Change in Lake Littoral Zones
Author: Kousei Martin PeralesPublisher:
ISBN:
Category :
Languages : en
Pages : 118
Book Description
Lake littoral zones play an integral role in production, community assembly, and the coupling of ecosystem components. These areas are critical habitat for many species due to its structural complexity in the form of abundant habitat. Because these areas are essential components of lakes, I explore several drivers in littoral zones. I have taken cross-system comparisons, long-term observations, and detailed within lake observations and combined them with modeling to ask the following questions about littoral zone habitat and communities: what are strong drivers of littoral zone habitat quality, and what is the role of this habitat? In Chapter 1, I quantify lake water level changes during a multiyear drought. These lakes experienced nearly identical weather and climate but had divergent responses in terms of water level loss. This variability was explained by lake and landscape characteristics that served as proxies for a lakes' hydrologic budget, which ultimately mediate the response to climate. I found that seepage lakes responded the most dramatically, and the water level changes translated to more substantial losses of coarse woody habitat (CWH). Thus, droughts and the associated impacts on habitat may be a regional driver of change. In Chapter 2, I characterized fish community and habitat change across a lakeshore residential development (LRD) gradient. I quantified the typical habitat changes associated with increasing LRD, including decreased CWH and riparian forest density and alterations in littoral substrates. Additionally, I identified winners and losers in the fish community across an LRD gradient. I found that fish with similar responses to LRD had vastly different habitat associations, suggesting that other drivers associated with LRD are likely also affecting communities. In Chapter 3, I examine the spatiotemporal dynamics of an invasive rusty crayfish (Faxonius rusticus) and native virile crayfish (F. virilis) population in the context of a whole-lake experiment. Eight years of rusty crayfish removals successfully suppressed a high abundance population, which allowed macrophytes, macroinvertebrates, Lepomis sunfishes, and virile crayfish to recover. In examining the within lake spatiotemporal dynamics of both species, I learn that the virile crayfish recovery was highly localized, and influenced by littoral habitat and the abundance of rusty crayfish.
Issue Paper 3
Author: Geoffrey PoolePublisher:
ISBN:
Category : Pacific salmon
Languages : en
Pages : 31
Book Description
"The technical workgroup developed five technical summaries on the major physical and biological considerations for developing water temperature standards: 1. thermal effects on salmonid physiology, 2. thermal effects on salmonid behavior, 3. interactions between multiple stressors ... affecting salmonids, 4. thermal influences on salmonid distribution, and 5. spatial and temporal variation in patterns of stream temperature."--Preface.
Selected Water Resources Abstracts
Author: Encyclopedia of Lakes and Reservoirs
Author: Lars BengtssonPublisher: Springer
ISBN: 9781402056161
Category : Science
Languages : en
Pages : 954
Book Description
Lakes and reservoirs hold about 90% of the world's surface fresh water, but overuse, water withdrawal and pollution of these bodies puts some one billion people at risk. The Encyclopedia of Lakes and Reservoirs reviews the physical, chemical and ecological characteristics of lakes and reservoirs, and describes their uses and environmental state trends in different parts of the world. Superbly illustrated throughout, it includes some 200 entries in a range of topics, including acidification, artificialisation, canals, climate change effects, dams, dew ponds, drainage, eutrofication, evaporation, fisheries, hydro-electric power, nutrients, organic pollution, paleolimnology, reservoir capacities and depths, sedimentation, water resources and more.