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result sql = Little is known about Hg accumulation in littoral communities, especially in periphyton biofilm of unperturbed lakes. The objectives of this study were to investigate and establish relationships between total mercury (THg) and methylmercury (MeHg) concentrations in periphyton communities of Boreal lakes and watershed physiographic and lake morphometric characteristics. This study was carried out on 23 Boreal Canadian Shield lakes located between 47-50 degrees N and 73-77 degrees W. Periphyton was sampled on rocks, the dominant periphyton substrate in the littoral zone of these lakes. Periphyton algal biomass (Chla) ranged from 12 to 164 mg m(-2) whereas THg concentrations varied from 42 to 271 ng g(-1) DW and MeHg levels varied from 3 to 55 ng Hg g(-1) DW. Periphyton biomass was positively correlated to latitude, watershed wetland area and negatively correlated to watershed slope and depth of the lake. THg concentrations in periphyton were negatively correlated to watershed wetland area whereas MeHg concentrations were negatively correlated to latitude and positively correlated to watershed slope, dissolved sulfate concentration and the presence of beavers in the lake. This study confirms that periphyton can accumulate large amounts of Hg and the accumulation is strongly influenced by watershed characteristics and periphyton biomass.
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result sql = Total mercury and methylmercury accumulation in periphyton of Boreal Shield lakes: influence of watershed physiographic characteristics.
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char = a;code = 97
char = b;code = 98
char = l;code = 108
char = i;code = 105
char = s;code = 115
char = h;code = 104
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = h;code = 104
char = i;code = 105
char = p;code = 112
char = s;code = 115
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = w;code = 119
char = e;code = 101
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = t;code = 116
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = y;code = 121
char = ;code = 32
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char = T;code = 84
char = H;code = 72
char = g;code = 103
char = );code = 41
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = h;code = 104
char = y;code = 121
char = l;code = 108
char = m;code = 109
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = u;code = 117
char = r;code = 114
char = y;code = 121
char = ;code = 32
char = (;code = 40
char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
char = );code = 41
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = s;code = 115
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char = i;code = 105
char = n;code = 110
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = p;code = 112
char = h;code = 104
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = m;code = 109
char = u;code = 117
char = n;code = 110
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = e;code = 101
char = s;code = 115
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = B;code = 66
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = k;code = 107
char = e;code = 101
char = s;code = 115
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char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = s;code = 115
char = h;code = 104
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = h;code = 104
char = y;code = 121
char = s;code = 115
char = i;code = 105
char = o;code = 111
char = g;code = 103
char = r;code = 114
char = a;code = 97
char = p;code = 112
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = k;code = 107
char = e;code = 101
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = r;code = 114
char = p;code = 112
char = h;code = 104
char = o;code = 111
char = m;code = 109
char = e;code = 101
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = a;code = 97
char = r;code = 114
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = s;code = 115
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = i;code = 105
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = u;code = 117
char = d;code = 100
char = y;code = 121
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = r;code = 114
char = i;code = 105
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = 2;code = 50
char = 3;code = 51
char = ;code = 32
char = B;code = 66
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = C;code = 67
char = a;code = 97
char = n;code = 110
char = a;code = 97
char = d;code = 100
char = i;code = 105
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = S;code = 83
char = h;code = 104
char = i;code = 105
char = e;code = 101
char = l;code = 108
char = d;code = 100
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = k;code = 107
char = e;code = 101
char = s;code = 115
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char = l;code = 108
char = o;code = 111
char = c;code = 99
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = e;code = 101
char = t;code = 116
char = w;code = 119
char = e;code = 101
char = e;code = 101
char = n;code = 110
char = ;code = 32
char = 4;code = 52
char = 7;code = 55
char = -;code = 45
char = 5;code = 53
char = 0;code = 48
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char = d;code = 100
char = e;code = 101
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = N;code = 78
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = 7;code = 55
char = 3;code = 51
char = -;code = 45
char = 7;code = 55
char = 7;code = 55
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = g;code = 103
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = s;code = 115
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char = W;code = 87
char = .;code = 46
char = ;code = 32
char = P;code = 80
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = p;code = 112
char = h;code = 104
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = r;code = 114
char = o;code = 111
char = c;code = 99
char = k;code = 107
char = s;code = 115
char = ,;code = 44
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
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char = d;code = 100
char = o;code = 111
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = a;code = 97
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = p;code = 112
char = h;code = 104
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = b;code = 98
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
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char = i;code = 105
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char = ;code = 32
char = t;code = 116
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char = e;code = 101
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char = l;code = 108
char = i;code = 105
char = t;code = 116
char = t;code = 116
char = o;code = 111
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char = a;code = 97
char = l;code = 108
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char = z;code = 122
char = o;code = 111
char = n;code = 110
char = e;code = 101
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char = o;code = 111
char = f;code = 102
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = s;code = 115
char = e;code = 101
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char = l;code = 108
char = a;code = 97
char = k;code = 107
char = e;code = 101
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char = .;code = 46
char = ;code = 32
char = P;code = 80
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = p;code = 112
char = h;code = 104
char = y;code = 121
char = t;code = 116
char = o;code = 111
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char = a;code = 97
char = l;code = 108
char = g;code = 103
char = a;code = 97
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char = ;code = 32
char = b;code = 98
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char = o;code = 111
char = m;code = 109
char = a;code = 97
char = s;code = 115
char = s;code = 115
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char = (;code = 40
char = C;code = 67
char = h;code = 104
char = l;code = 108
char = a;code = 97
char = );code = 41
char = ;code = 32
char = r;code = 114
char = a;code = 97
char = n;code = 110
char = g;code = 103
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
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char = 1;code = 49
char = 2;code = 50
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 1;code = 49
char = 6;code = 54
char = 4;code = 52
char = ;code = 32
char = m;code = 109
char = g;code = 103
char = ;code = 32
char = m;code = 109
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char = -;code = 45
char = 2;code = 50
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char = ;code = 32
char = w;code = 119
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = T;code = 84
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
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char = a;code = 97
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char = i;code = 105
char = o;code = 111
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char = s;code = 115
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char = v;code = 118
char = a;code = 97
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char = e;code = 101
char = d;code = 100
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char = f;code = 102
char = r;code = 114
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char = m;code = 109
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char = 4;code = 52
char = 2;code = 50
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 2;code = 50
char = 7;code = 55
char = 1;code = 49
char = ;code = 32
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = g;code = 103
char = (;code = 40
char = -;code = 45
char = 1;code = 49
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char = ;code = 32
char = D;code = 68
char = W;code = 87
char = ;code = 32
char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = v;code = 118
char = e;code = 101
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char = s;code = 115
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char = e;code = 101
char = d;code = 100
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = 3;code = 51
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = 5;code = 53
char = 5;code = 53
char = ;code = 32
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = g;code = 103
char = (;code = 40
char = -;code = 45
char = 1;code = 49
char = );code = 41
char = ;code = 32
char = D;code = 68
char = W;code = 87
char = .;code = 46
char = ;code = 32
char = P;code = 80
char = e;code = 101
char = r;code = 114
char = i;code = 105
char = p;code = 112
char = h;code = 104
char = y;code = 121
char = t;code = 116
char = o;code = 111
char = n;code = 110
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char = b;code = 98
char = i;code = 105
char = o;code = 111
char = m;code = 109
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
char = ;code = 32
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
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char = c;code = 99
char = o;code = 111
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
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char = t;code = 116
char = o;code = 111
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char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
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char = u;code = 117
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char = e;code = 101
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char = a;code = 97
char = t;code = 116
char = e;code = 101
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char = s;code = 115
char = h;code = 104
char = e;code = 101
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char = t;code = 116
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char = e;code = 101
char = a;code = 97
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char = e;code = 101
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char = t;code = 116
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char = e;code = 101
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char = l;code = 108
char = a;code = 97
char = k;code = 107
char = e;code = 101
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = H;code = 72
char = g;code = 103
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char = c;code = 99
char = o;code = 111
char = n;code = 110
char = c;code = 99
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char = t;code = 116
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char = a;code = 97
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char = i;code = 105
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char = s;code = 115
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char = y;code = 121
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char = a;code = 97
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char = v;code = 118
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char = r;code = 114
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char = a;code = 97
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char = e;code = 101
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char = t;code = 116
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char = w;code = 119
char = a;code = 97
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char = s;code = 115
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char = e;code = 101
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char = h;code = 104
char = e;code = 101
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char = a;code = 97
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char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
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char = c;code = 99
char = o;code = 111
char = n;code = 110
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char = i;code = 105
char = o;code = 111
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char = w;code = 119
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char = a;code = 97
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char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
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char = r;code = 114
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char = l;code = 108
char = a;code = 97
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char = e;code = 101
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char = t;code = 116
char = o;code = 111
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char = l;code = 108
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = t;code = 116
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char = d;code = 100
char = e;code = 101
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char = d;code = 100
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char = p;code = 112
char = o;code = 111
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char = i;code = 105
char = t;code = 116
char = i;code = 105
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
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char = c;code = 99
char = o;code = 111
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char = r;code = 114
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char = l;code = 108
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
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char = t;code = 116
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result sql = Little is known about Hg accumulation in littoral communities, especially in periphyton biofilm of unperturbed lakes. The objectives of this study were to investigate and establish relationships between total mercury (THg) and methylmercury (MeHg) concentrations in periphyton communities of Boreal lakes and watershed physiographic and lake morphometric characteristics. This study was carried out on 23 Boreal Canadian Shield lakes located between 47-50 degrees N and 73-77 degrees W. Periphyton was sampled on rocks, the dominant periphyton substrate in the littoral zone of these lakes. Periphyton algal biomass (Chla) ranged from 12 to 164 mg m(-2) whereas THg concentrations varied from 42 to 271 ng g(-1) DW and MeHg levels varied from 3 to 55 ng Hg g(-1) DW. Periphyton biomass was positively correlated to latitude, watershed wetland area and negatively correlated to watershed slope and depth of the lake. THg concentrations in periphyton were negatively correlated to watershed wetland area whereas MeHg concentrations were negatively correlated to latitude and positively correlated to watershed slope, dissolved sulfate concentration and the presence of beavers in the lake. This study confirms that periphyton can accumulate large amounts of Hg and the accumulation is strongly influenced by watershed characteristics and periphyton biomass.
Publication: Sci. Total Environ. 2006 Feb 15 ;355(1-3)::247-58.
Publication Date: 2006 Feb 15
Study Author(s): Desrosiers, Mélanie;Planas, Dolors;Mucci, Alfonso;
Institution: Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Département de Sciences Biologiques, Université du Québec à Montréal, C. P. 8888, Succursale Centre Ville, Montréal, Québec, Canada H3C 3P8.
Shortcut link to this study:
Publication Date: 2006 Feb 15
Study Author(s): Desrosiers, Mélanie;Planas, Dolors;Mucci, Alfonso;
Institution: Groupe de Recherche Interuniversitaire en Limnologie (GRIL), Département de Sciences Biologiques, Université du Québec à Montréal, C. P. 8888, Succursale Centre Ville, Montréal, Québec, Canada H3C 3P8.
Shortcut link to this study:
Little is known about Hg accumulation in littoral communities, especially in periphyton biofilm of unperturbed lakes. The objectives of this study were to investigate and establish relationships between total mercury (THg) and methylmercury (MeHg) concentrations in periphyton communities of Boreal lakes and watershed physiographic and lake morphometric characteristics. This study was carried out on 23 Boreal Canadian Shield lakes located between 47-50 degrees N and 73-77 degrees W. Periphyton was sampled on rocks, the dominant periphyton substrate in the littoral zone of these lakes. Periphyton algal biomass (Chla) ranged from 12 to 164 mg m(-2) whereas THg concentrations varied from 42 to 271 ng g(-1) DW and MeHg levels varied from 3 to 55 ng Hg g(-1) DW. Periphyton biomass was positively correlated to latitude, watershed wetland area and negatively correlated to watershed slope and depth of the lake. THg concentrations in periphyton were negatively correlated to watershed wetland area whereas MeHg concentrations were negatively correlated to latitude and positively correlated to watershed slope, dissolved sulfate concentration and the presence of beavers in the lake. This study confirms that periphyton can accumulate large amounts of Hg and the accumulation is strongly influenced by watershed characteristics and periphyton biomass.
PMID: 15894350
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