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result sql = Effects of stream water chemistry and tree species on release and methylation of mercury during litter decomposition.
Effects of stream water chemistry and tree species on release and methylation of mercury during litter decomposition.
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char = t;code = 116
char = h;code = 104
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = s;code = 115
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = v;code = 118
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = f;code = 102
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ,;code = 44
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = n;code = 110
char = d;code = 100
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = l;code = 108
char = i;code = 105
char = d;code = 100
char = ,;code = 44
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = l;code = 108
char = o;code = 111
char = r;code = 114
char = o;code = 111
char = p;code = 112
char = h;code = 104
char = y;code = 121
char = l;code = 108
char = l;code = 108
char = -;code = 45
char = a;code = 97
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
char = ;code = 32
char = (;code = 40
char = e;code = 101
char = .;code = 46
char = g;code = 103
char = .;code = 46
char = ,;code = 44
char = ;code = 32
char = e;code = 101
char = u;code = 117
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = p;code = 112
char = h;code = 104
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = m;code = 109
char = s;code = 115
char = ;code = 32
char = d;code = 100
char = r;code = 114
char = a;code = 97
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = a;code = 97
char = g;code = 103
char = r;code = 114
char = i;code = 105
char = c;code = 99
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = u;code = 117
char = r;code = 114
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = );code = 41
char = ;code = 32
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = s;code = 115
char = s;code = 115
char = o;code = 111
char = c;code = 99
char = i;code = 105
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
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 = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = a;code = 97
char = r;code = 114
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = e;code = 101
char = .;code = 46
char = g;code = 103
char = .;code = 46
char = ,;code = 44
char = ;code = 32
char = c;code = 99
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = r;code = 114
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 = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = l;code = 108
char = d;code = 100
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = o;code = 111
char = u;code = 117
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = m;code = 109
char = );code = 41
char = .;code = 46
char = ;code = 32
char = A;code = 65
char = c;code = 99
char = r;code = 114
char = o;code = 111
char = s;code = 115
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = x;code = 120
char = ;code = 32
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = o;code = 111
char = l;code = 108
char = l;code = 108
char = e;code = 101
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = i;code = 105
char = n;code = 110
char = c;code = 99
char = u;code = 117
char = b;code = 98
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = a;code = 97
char = m;code = 109
char = e;code = 101
char = ;code = 32
char = s;code = 115
char = o;code = 111
char = u;code = 117
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ,;code = 44
char = ;code = 32
char = l;code = 108
char = i;code = 105
char = t;code = 116
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = f;code = 102
char = r;code = 114
char = o;code = 111
char = m;code = 109
char = ;code = 32
char = s;code = 115
char = l;code = 108
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = s;code = 115
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = e;code = 101
char = .;code = 46
char = g;code = 103
char = .;code = 46
char = ,;code = 44
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = d;code = 100
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = p;code = 112
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = );code = 41
char = ;code = 32
char = y;code = 121
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char = e;code = 101
char = l;code = 108
char = d;code = 100
char = e;code = 101
char = d;code = 100
char = ;code = 32
char = h;code = 104
char = i;code = 105
char = g;code = 103
char = h;code = 104
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = D;code = 68
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
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
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = n;code = 110
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char = t;code = 116
char = h;code = 104
char = o;code = 111
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = w;code = 119
char = i;code = 105
char = t;code = 116
char = h;code = 104
char = ;code = 32
char = m;code = 109
char = o;code = 111
char = r;code = 114
char = e;code = 101
char = ;code = 32
char = l;code = 108
char = a;code = 97
char = b;code = 98
char = i;code = 105
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = r;code = 114
char = b;code = 98
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = (;code = 40
char = e;code = 101
char = .;code = 46
char = g;code = 103
char = .;code = 46
char = ,;code = 44
char = ;code = 32
char = m;code = 109
char = a;code = 97
char = p;code = 112
char = l;code = 108
char = e;code = 101
char = ;code = 32
char = a;code = 97
char = n;code = 110
char = d;code = 100
char = ;code = 32
char = b;code = 98
char = i;code = 105
char = r;code = 114
char = c;code = 99
char = h;code = 104
char = );code = 41
char = .;code = 46
char = ;code = 32
char = P;code = 80
char = e;code = 101
char = r;code = 114
char = c;code = 99
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = M;code = 77
char = e;code = 101
char = H;code = 72
char = g;code = 103
char = ,;code = 44
char = ;code = 32
char = h;code = 104
char = o;code = 111
char = w;code = 119
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = r;code = 114
char = ,;code = 44
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = s;code = 115
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 = v;code = 118
char = e;code = 101
char = l;code = 108
char = y;code = 121
char = ;code = 32
char = s;code = 115
char = i;code = 105
char = m;code = 109
char = i;code = 105
char = l;code = 108
char = a;code = 97
char = r;code = 114
char = ;code = 32
char = a;code = 97
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = d;code = 100
char = i;code = 105
char = f;code = 102
char = f;code = 102
char = e;code = 101
char = r;code = 114
char = e;code = 101
char = n;code = 110
char = t;code = 116
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = f;code = 102
char = ;code = 32
char = s;code = 115
char = p;code = 112
char = e;code = 101
char = c;code = 99
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = (;code = 40
char = i;code = 105
char = .;code = 46
char = e;code = 101
char = .;code = 46
char = ,;code = 44
char = ;code = 32
char = 6;code = 54
char = 1;code = 49
char = -;code = 45
char = 8;code = 56
char = 6;code = 54
char = %;code = 37
char = );code = 41
char = .;code = 46
char = ;code = 32
char = O;code = 79
char = u;code = 117
char = r;code = 114
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 = i;code = 105
char = s;code = 115
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = f;code = 102
char = i;code = 105
char = r;code = 114
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = o;code = 111
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = m;code = 109
char = o;code = 111
char = n;code = 110
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = e;code = 101
char = a;code = 97
char = m;code = 109
char = ;code = 32
char = w;code = 119
char = a;code = 97
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = ;code = 32
char = c;code = 99
char = h;code = 104
char = e;code = 101
char = m;code = 109
char = i;code = 105
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = y;code = 121
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char = a;code = 97
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char = d;code = 100
char = ;code = 32
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = r;code = 114
char = i;code = 105
char = a;code = 97
char = l;code = 108
char = ;code = 32
char = p;code = 112
char = l;code = 108
char = a;code = 97
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char = t;code = 116
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char = l;code = 108
char = i;code = 105
char = t;code = 116
char = t;code = 116
char = e;code = 101
char = r;code = 114
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char = c;code = 99
char = h;code = 104
char = a;code = 97
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char = a;code = 97
char = c;code = 99
char = t;code = 116
char = e;code = 101
char = r;code = 114
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char = s;code = 115
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = s;code = 115
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char = a;code = 97
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char = e;code = 101
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char = i;code = 105
char = m;code = 109
char = p;code = 112
char = o;code = 111
char = r;code = 114
char = t;code = 116
char = a;code = 97
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char = t;code = 116
char = ;code = 32
char = f;code = 102
char = a;code = 97
char = c;code = 99
char = t;code = 116
char = o;code = 111
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char = s;code = 115
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char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = H;code = 72
char = g;code = 103
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = l;code = 108
char = e;code = 101
char = a;code = 97
char = s;code = 115
char = e;code = 101
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 = a;code = 97
char = t;code = 116
char = i;code = 105
char = o;code = 111
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = u;code = 117
char = r;code = 114
char = i;code = 105
char = n;code = 110
char = g;code = 103
char = ;code = 32
char = h;code = 104
char = y;code = 121
char = p;code = 112
char = o;code = 111
char = x;code = 120
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = l;code = 108
char = i;code = 105
char = t;code = 116
char = t;code = 116
char = e;code = 101
char = r;code = 114
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char = d;code = 100
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = m;code = 109
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 = o;code = 111
char = n;code = 110
char = .;code = 46
char = ;code = 32
char = T;code = 84
char = h;code = 104
char = e;code = 101
char = s;code = 115
char = e;code = 101
char = ;code = 32
char = r;code = 114
char = e;code = 101
char = s;code = 115
char = u;code = 117
char = l;code = 108
char = t;code = 116
char = s;code = 115
char = ;code = 32
char = s;code = 115
char = u;code = 117
char = g;code = 103
char = g;code = 103
char = e;code = 101
char = s;code = 115
char = t;code = 116
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = a;code = 97
char = t;code = 116
char = ;code = 32
char = c;code = 99
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = a;code = 97
char = i;code = 105
char = n;code = 110
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 = a;code = 97
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char = d;code = 100
char = ;code = 32
char = a;code = 97
char = q;code = 113
char = u;code = 117
char = a;code = 97
char = t;code = 116
char = i;code = 105
char = c;code = 99
char = ;code = 32
char = e;code = 101
char = c;code = 99
char = o;code = 111
char = s;code = 115
char = y;code = 121
char = s;code = 115
char = t;code = 116
char = e;code = 101
char = m;code = 109
char = ;code = 32
char = p;code = 112
char = r;code = 114
char = o;code = 111
char = p;code = 112
char = e;code = 101
char = r;code = 114
char = t;code = 116
char = i;code = 105
char = e;code = 101
char = s;code = 115
char = ;code = 32
char = c;code = 99
char = a;code = 97
char = n;code = 110
char = ;code = 32
char = d;code = 100
char = e;code = 101
char = t;code = 116
char = e;code = 101
char = r;code = 114
char = m;code = 109
char = i;code = 105
char = n;code = 110
char = e;code = 101
char = ;code = 32
char = t;code = 116
char = h;code = 104
char = e;code = 101
char = ;code = 32
char = l;code = 108
char = e;code = 101
char = v;code = 118
char = e;code = 101
char = l;code = 108
char = s;code = 115
char = ;code = 32
char = o;code = 111
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result sql = Foliage of terrestrial plants provides an important energy and nutrient source to aquatic ecosystems but also represents a potential source of contaminants, such as mercury (Hg). In this study, we examined how different stream water types and terrestrial tree species influenced the release of Hg from senesced litter to the water and its subsequent methylation during hypoxic litter decomposition. After laboratory incubations of maple leaf litter for 66 days, we observed 10-fold differences in dissolved Hg (DHg, < 0.45-microm) concentrations among different stream water types and more than 50-fold differences in dissolved methylmercury (DMeHg) concentrations. Percent MeHg (i.e., DMeHg x 100 / DHg on day 66) varied from 23-102% across seven natural stream water types. In general, stream waters with higher dissolved sulfate, suspended solid, and chlorophyll-a concentrations (e.g., eutrophic streams draining agricultural land) are associated with higher Hg release and methylation compared to more pristine sites (e.g., clear waters from coldwater trout stream). Across six tree species collected at the same site and incubated with the same source water, litter from slower decomposing species (e.g., cedar and pine) yielded higher DHg concentrations than those with more labile carbon (e.g., maple and birch). Percent MeHg, however, was relatively similar among different leaf species (i.e., 61-86%). Our study is the first to demonstrate that stream water chemistry and terrestrial plant litter characteristics are important factors determining Hg release and methylation during hypoxic litter decomposition. These results suggest that certain watershed and aquatic ecosystem properties can determine the levels of MeHg inputs during litterfall events.

Publication: Environ. Sci. Technol. 2008 Dec 1 ;42(23)::8692-7.
Publication Date: 2008 Dec 1
Study Author(s): Tsui, Martin Tsz Ki;Finlay, Jacques C;Nater, Edward A;
Institution: Graduate Program in Water Resources Science, Department of Ecology, Evolution and Behavior, Department of Soil, Water and Climate, University of Minnesota, St. Paul, Minnesota 55108, USA. [email protected]
Shortcut link to this study:
Foliage of terrestrial plants provides an important energy and nutrient source to aquatic ecosystems but also represents a potential source of contaminants, such as mercury (Hg). In this study, we examined how different stream water types and terrestrial tree species influenced the release of Hg from senesced litter to the water and its subsequent methylation during hypoxic litter decomposition. After laboratory incubations of maple leaf litter for 66 days, we observed 10-fold differences in dissolved Hg (DHg, < 0.45-microm) concentrations among different stream water types and more than 50-fold differences in dissolved methylmercury (DMeHg) concentrations. Percent MeHg (i.e., DMeHg x 100 / DHg on day 66) varied from 23-102% across seven natural stream water types. In general, stream waters with higher dissolved sulfate, suspended solid, and chlorophyll-a concentrations (e.g., eutrophic streams draining agricultural land) are associated with higher Hg release and methylation compared to more pristine sites (e.g., clear waters from coldwater trout stream). Across six tree species collected at the same site and incubated with the same source water, litter from slower decomposing species (e.g., cedar and pine) yielded higher DHg concentrations than those with more labile carbon (e.g., maple and birch). Percent MeHg, however, was relatively similar among different leaf species (i.e., 61-86%). Our study is the first to demonstrate that stream water chemistry and terrestrial plant litter characteristics are important factors determining Hg release and methylation during hypoxic litter decomposition. These results suggest that certain watershed and aquatic ecosystem properties can determine the levels of MeHg inputs during litterfall events.
PMID: 19192783

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