Presentation.


40 views
Uploaded on:
Description
2. ZEBRA MUSSEL INVASION. Vicinity in expansive numbers may produce a ton ... Zebra mussel may be
Transcripts
Slide 1

Presentation Cuyahoga River, 1952 Lake Erie: Progress and Regression Progress 1952 Cuyahoga River goes ablaze 1969 Cuyahoga River goes ablaze again 1960s and 1970s Canada and the USA concede to and actualize a phosphorus control framework that includes numerous new sewage treatment control frameworks, bans phosphorus cleansers and builds up numerous checking areas in 33 streams and in Lake Erie

Slide 2

Progress in 70s and 80s Progress 1970s and 1980s - Lake water quality enhances No more algal blossoms No more cyanobacteria sprouts in the western district of the lake No more "tangles" of vegetation appearing on-shore Lake Erie oxygen levels come back to ordinary Lake Erie considered "recuperated" from past huge eutrophication because of past phosphorus over-burden

Slide 3

Regression

Slide 4

Late 90s issues In the late 90s, Lake Erie started to show side effects that had been truant for a long time: Dead algal tangles and plant material appearing on shorelines Birds passing on from botulism Walleye populace diminished by 66% Toxic chemicals expanding in fish and feathered creatures Fish have constant and expanding quantities of tumors The "no man\'s land" (the locale where the more profound parts of the lake get to be anaerobic - roughly <1 ppm oxygen levels - amid the mid year months) increments and keeps on spreading.

Slide 5

Reasons - Phosphorus Possible explanations behind Regression 1. PHOSPHORUS LEVELS Inadequate checking (just 8 waterway stations now observed versus 33 before) Voluntary reporting now essentially Reporting of levels of phosphorus may belittle sums: Official reported levels of phosphorus are: Prior to 1960 = roughly 30,000 tons for each year Target after 1960 = 11,000 tons 1999 = 7000 tons 2000 = 9000 tons Sewage plant floods because of limit being surpassed because of populace builds Storm sewers and clean sewers joined (e.g. in Detroit) Industrial discharges not reported Farming utilization of phosphorus manures and subsequent overflow expanded

Slide 6

State of the Lakes

Slide 7

Reasons - Zebra MUssels Possible purposes behind Regression 2. ZEBRA MUSSEL INVASION Presence in substantial numbers may create a great deal of natural material that moves to the more profound zones and causes oxygen exhaustion. May make natural surroundings for Clostridium botulinum , the living being that cases botulism harming through the creation of botulinum poison. The vehicle of the poison might be aided by the nearness of the round gobi, a types of fish from the Black Sea that bolsters on the zebra mussel (additionally from the Black Sea) and might be the transporter of botulinum poison to the surface layers as it is eaten by bigger fish and afterward feathered creatures. Zebra mussel might clear up the water by its channel encouraging frameworks and making it less reasonable for the walleye types of fish (more than 60% decrease in only a couple of years - angling limits have been divided to attempt and recuperate the populaces). In the event that the walleye populace falls, the lake is then populated by higher quantities of littler fish species, (for example, noticed) - the same as in the 1960s !

Slide 8

Reasons – Global warming Possible explanations behind Regression 3. An Earth-wide temperature boost Water from the lake entering admission funnels for civil water frameworks has demonstrated a steady yearly increment in temperature since the 1960s This may bring about an augmentation of the period that the lake is stratified amid the mid year months and this expansion may drive more oxygen to be used and therefore augment the "no man\'s land" in the focal bowl Global warming may likewise prompt lower water levels, diminishing the measure of oxygenated water accessible in the surface layers. Note: The focal bowl is just around 22 meters profound and the no man\'s land is 2 or 3 meters at the base

Slide 9

Conclusion Or, it might be a mix of these elements. Then again a mind boggling connection amongst these and other, obscure, variables !

Recommended
View more...