mercury contamination of lake trout ecosystems

... Dog River, a Lake Superior tributary that once supported a spawning run of lake trout (Loftus, 1958), is perhaps reminiscent of some of the habitat occupied by lake trout during much of its evolutionary ... Factors that shape lake trout ecosystems Figure 1.4 Boreal Shield lake trout lakes shape the distribution and dynamics of lake trout populations and their management challenges These lakes exhibit ... as a controlling variable in lake trout and other Boreal Shield lakes 133 David W Schindler and John M Gunn Chapter Mercury contamination of lake trout ecosystems 147 R.A (Drew)...

Ngày tải lên: 23/03/2014, 01:20

... Dog River, a Lake Superior tributary that once supported a spawning run of lake trout (Loftus, 1958), is perhaps reminiscent of some of the habitat occupied by lake trout during much of its evolutionary ... Boreal Shield Appendix Lake trout lakes of the Boreal Shield ecozone of North America Appendix Common and scientific names for fish species in selected Boreal Shield lake trout lakes Appendix Conversion ... History and evolution of lake trout in Shield lakes: past and future challenges Chris C Wilson and Nicholas E Mandrak Chapter Rehabilitation of lake trout in the Great Lakes: past lessons and...

Ngày tải lên: 11/08/2014, 10:21

... Fishes of the Great Lakes Region, University of Michigan Press, Ann Arbor Hussakof, L., 1916, Discovery of the great lake trout, Cristivomer namaycush, in the Pleistocene of Wisconsin, Journal of ... speciation of Salvelinus namaycush in Lake Superior: an investigation of genetic and morphological variation and evolution of lake trout in the Laurentian Great Lakes, Ph.D dissertation, University of ... variation of lake trout populations from small inland lakes despite abundant anecdotal data about individual populations Given the diverse history, sources, and length of isolation of many Shield lakes,...

Ngày tải lên: 11/08/2014, 10:21

... occurred in Lake Erie This lake has the least lake trout habitat of any of the Great Lakes, and suitable waters are restricted to the eastern basin of the lake Lake Erie was the last Great Lake to ... L.P., 1995, Lake trout rehabilitation in Lake Ontario, Journal of Great Lakes Research 21(Suppl 1):83–107 Eshenroder, R.L., 1992, Decline of lake trout in Lake Huron, Transactions of the American ... of a single lake trout fry by the New York State Department of Environmental Conservation and by a collection of 75 fry off the north end of Stony Island in 1986 (Marsden et al., 1988) Lake trout...

Ngày tải lên: 11/08/2014, 10:21

... diagnosis of their effects on lake trout populations in Ontario lakes Lake trout synthesis, Ontario Ministry of Natural Resources, Toronto Fitzsimons, J.D., 1994, An evaluation of lake trout spawning ... Analysis of Questionnaire on Stresses Acting on Lake Trout Lakes, Lake Trout Synthesis, Ontario Ministry of Natural Resources, Toronto Loftus, K.H., 1958, Studies on river-spawning populations of lake ... Spawning behavior of lake trout: effects on colonization ability, Journal of Great Lakes Research 21(Suppl 1):323-329 Hacker, V.A., 1957, Biology and management of lake trout in Green lake, Wisconsin,...

Ngày tải lên: 11/08/2014, 10:21

... 20% of their optimal habitat, whereas lakes with only 10 to 25% of their volume as optimal habitat could lose 50% or more of the remaining habitat, putting the continued success of the lake trout ... stocking on the dynamics and productivity of lake trout populations in Ontario lakes, In Lake Trout Synthesis, Response to Stress Working Group, Ontario Ministry of Natural Resources, Toronto, Ontario ... is the area of the top of the stratum (m2) Ab is the area of the bottom of the stratum (m2) m is the depth (thickness) of the stratum (m) VWHO is calculated as the summed products of the measured...

Ngày tải lên: 11/08/2014, 10:21

... 50 Lake Trout lakes Non -Lake Trout Lakes Percent of Lakes 40 30 20 10 100-110 90-100 80-90 70-80 60-70 50-60 40-50 30-40 20-30 10-20 0-10 Maximum Depth (m) (a) 70 Non -Lake Trout Lakes Lake Trout ... 102 lake trout lakes and 394 lakes without lake trout in Ontario The distribution of TP in lake trout lakes in Quebec (Figure 7.3) was very similar to that in Ontario (Prairie, 1994) Of 125 lakes ... consideration of the role of nutrients in lake trout biology is inextricably linked with morphometry because of the nutrient–oxygen relationship A comparison of the size of lake trout lakes with other lakes...

Ngày tải lên: 11/08/2014, 10:22

... majority of lake trout lakes are indeed quite small, with about 75% of them less than 500 (Figure 8.4) For lakes greater than about 500 in area, the effect of wind on the lake s surface becomes of ... properties of lakes Below are some of its more important effects The effect of DOC on the physical properties of lakes The dark color of allochthonous DOC makes it an excellent attenuator (absorber) of ... 80% of lake trout lakes have DOC concentrations >3 mg L-1 (Figure 8.2), a range where DOC attenuates enough light to reduce photosynthesis and block UV radiation The most colored lake trout lakes...

Ngày tải lên: 11/08/2014, 10:22

... concentrations of Hg in lake trout in Boreal lakes are probably mainly the result of the trophic position of lake trout in freshwater systems, the relatively large size and age of many individual lake trout, ... Boreal lakes (e.g., Wiener et al., 1990) Management of mercury exposure from consumption of lake trout The primary objective of provincial and federal agencies in Canada for managing mercury in lake ... greater than the Canadian marketing limit of 0.5 µg g-1 For example, 74% of the lake trout lakes in Ontario (excluding the Great Lakes) contain lake trout with Hg concentrations greater than...

Ngày tải lên: 11/08/2014, 10:22

... the eastern Catskill region of New York (6834 lakes), 5% of the lakes have ANC values

Ngày tải lên: 11/08/2014, 10:22

... south of Algonquin Park About 88 lakes now have a slot limit of 40–55 cm (TL), and a slot limit of 33–40 cm (TL) has been placed on 13 lakes with polyphagous lake trout stocks Of the 101 lakes ... al., 1991) recommended that winter lake trout seasons be reduced to month (February 15 to March 15) on all lake trout lakes less than 1000 ha, and that lake trout lakes less than 100 be closed to ... mortality of lake trout in late summer in lakes with inadequate thermal and dissolved oxygen refugia may nullify the intended benefit of size-based regulations Hooking mortality of lake trout during...

Ngày tải lên: 11/08/2014, 10:22

... Comparison of Central Ontario Lakes with and without Smallmouth Bass and Rock Bass Type Bass No bass Number of lakes Prey fish species richness Minnow catch ratea Lake trout trophic position Lake trout ... studies of Shield lakes with and without smallmouth and rock bass (Adapted from Vander Zanden et al., 1999.) of MacDonald Lake, but some years later, and the trophic position of Clean Lake lake trout ... while lake trout inhabit offshore, pelagic areas Despite these differences, bass and lake trout often share a common resource, and the introduction of bass has translated into the interruption of...

Ngày tải lên: 11/08/2014, 10:22

... m of the lake In the summer of 1997 a netting survey was conducted to assess the relative abundance of lake trout in the lake In the fall (October to 30, 1997) a spawning assessment of adult lake ... accumulated harvest (kg ha−1) of lake trout in Michaud Lake during the winter and spring of 1998, the year the lake opened to fishing lake trout spawning sites were within 20 m of a stream inlet Our ... behavioral response of lake trout to a loss of traditional spawning sites, Journal of Great Lakes Research, 21(Suppl 1): 375–383 McMurtry, M.J., 1986, Susceptibility of Lake Trout (Salvelinus namaycush)...

Ngày tải lên: 11/08/2014, 10:22

... types of lake trout lakes on the Shield The first is a southern group of very large lakes, including a large portion of the Laurentian Great Lakes In these massive, deep lakes, natural lake trout ... Canadian Journal of Fisheries and Aquatic Sciences, 41: 682–691 Bodaly, R.A and Kidd, K.A., 2003, Mercury contamination of lake trout ecosystems, in Boreal Shield Watersheds: Lake Trout Ecosystems ... hundreds of lake trout lakes and other Boreal Shield lakes via this mechanism If we look ahead 100 or perhaps 500 years into the future, there is no doubt that lake trout ecosystems of the Boreal...

Ngày tải lên: 11/08/2014, 10:22

... indicated averages of mercury concentrations; Lines indicated minimum and maximum of mercury concentrations Figure Total mercury concentrations in water samples from the Kahayan River Total Mercury Concentrations ... (Gochfeld 2003) Thus mercury contamination affects not only aquatic ecosystems but also human health (Elvince, et al., 2008) Ecological monitoring of mercury levels in the fish of Central Kalimantan ... Nagafuchi, O and Tsushima, K 2008 Mercury contamination in Lake Tilap, Central Kalimantan, Indonesia J of Ecotechnol Research., 13, 291-294 Gochfeld M 2003 Cases of mercury exposure, bioavailability,...

Ngày tải lên: 05/09/2013, 09:38

... and hydrogeology of aquatic ecosystems Krabbenhoft began working on environmental mercury cycling, transformations, and fluxes in aquatic ecosystems with the Mercury in Temperate Lakes project in ... this question Mercury concentrations in many regions of the globe have increased as a result of industrial activities Mercury contamination can occur as a localized issue near points of release ... watersheds in North America, the rate of mercury accumulation in lake sediments has increased by a factor of to since the mid-1800s, based on analyses of dated cores of sediment and peat (Swain et al...

Ngày tải lên: 12/08/2014, 04:22

... 1995b Mechanisms of deposition of mercury and methylmercury to coniferous forests Water Air Soil Pollut 80:363–371 Munthe J, Hultberg H 2004 Mercury and methylmercury in run-off from a forested ... Modeling the biogeochemical cycle of mercury in lakes: the Mercury Cycling Model (MCM) and its application to the MTL study lakes In: Watras CJ, Huckabee JW, editors, Mercury pollution integration ... cycling of Hg, but should be included because of its capacity for bioaccumulation Gaseous methylated mercury species have recently been quantified at concentrations in landfill gas of several orders of...

Ngày tải lên: 12/08/2014, 04:22

... concentrations of inorganic Hg in the surface waters of Lake 658 nearly doubled as a result of nearly doubling the total load of Hg to the lake surface (atmospheric deposition plus runoff; H Hintelmann, ... Export of Hg from catchment soils to downstream aquatic systems can account for anywhere from 90% (drainage lakes with large catchments or high runoff ... reflect the kinetics of complexation of the Hg and MeHg spikes during the time of incubation A number of studies have shown that the complexation of Hg spikes within hours of addition to sediments...

Ngày tải lên: 12/08/2014, 04:22

... administration of a radio-labeled dose of MeHg to rats, 65% of the dose was recovered in the feces as inorganic mercury, and 15% as organic mercury Urinary excretion accounted for less than 5% of the ... bioindicators of mercury contamination according to the characteristics discussed, from (lowest) to (highest), based on the assessments above and the best professional judgement of the authors of this ... 5.5.4.2 Hawks The concentration of mercury in terrestrial ecosystems has been determined through the use of tissue samples from hawks and other birds of prey Feathers of the northern goshawk (Accipiter...

Ngày tải lên: 12/08/2014, 04:22

... Journal of Fisheries and Aquatic Sciences, 37, 583-588 Dobrowolski A K., Kozakiewicz A and Leźnicka B (1993) The role of small mammals and birds in transport of matter through the shore zone of lakes, ... waterfowl in the water of Lake Miyajimanuma, Report of the Hokkaido Institute of Public Health, 47, 112-114 (in Japanese) Olson H M., Hage M M., Binkley D M and Binder R J (2005) Impact of migratory snow ... Fig TN concentration of 3.0 mg/L was observed at the beginning of the study period, in term S3, and decreased Table - Total weight of each species and its ratio to the sum of TWW for 10 dominant...

Ngày tải lên: 05/09/2013, 10:15