Nearshore Water Quality in Lake Winnipeg

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Nearshore Water Quality in Lake Winnipeg

• E. Pip
• University of Winnipeg

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Summary of nearshore
parameters Parameter Mean ()
S.E. Range --------------------------
-------------------------------------------------
Total dissolved solids mg/L
164 7 40
- 370 Nitrate-N mg/L 0.31
0.01 lt0.01-0.65 Dissolved organic
matter 275 nm
0.185 0.010 0.069-0.626 Cadmium
ug/L 2.6 0.2
lt0.1-7.0 Lead ug/L
8.3 0.6
lt0.1-23 Copper ug/L (all sites) 11.2
2.4 lt0.1-188 (lt50
ug/L, 87 sites) 7.6 0.7
-
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Nearshore Water Quality on East and West
Sides Parameter East
Side West
Side ---------------------------------------------
---------------------------------- TDS mg
138 12
176 8 Nitrate-N mg/L
0.22 0.02 0.35 0.02 DOM
275 nm 0.187 0.014
0.185 0.013 Cadmium ug/L
2.8 0.3 2.5
0.2 Lead ug/L 11.3
1.3 6.7 0.6 Copper
ug/L (all sites) 14.9 6.3
9.3 1.8 -------------------------------
------------------------------------------------
Statistically significant difference
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The 2001 sampling sites classified according
to major type of
human impact Major
adjacent impact Percent
----------------------------------------------
----- Least impact
4
Cottage/recreational 74
Agriculture (livestock)
6 Urban effluent
16
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Water quality (x (S.E.)) according to major types
of human impacts Parameter Least impact
Recreational Urban Agricultural --------
--------------------------------------------------
------------------------ TDS mg/L 118
(15) 164 (8) 161 (17) 200
(23) Nitrate-N mg/L 0.30 (0.06) 0.31
(0.02) 0.32 (0.04) 0.34 (0.03) DOM 275 nm
0.13 (0.02) 0.19 (0.01) 0.18 (0.03)
0.24 (0.04) Cadmium ug/L 2.3 (0.5)
2.6 (0.2) 2.9 (0.5) 2.4 (0.6) Lead
ug/L 7.0 (1.9) 8.4 (0.7)
8.4 (1.9) 7.1 (2.6) Copper ug/L
7.0 (6.0) 10.7 (2.9) 16.2 (6.5)
7.3 (3.4)
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Comparison of the same 25 sites sampled in July
of 1998 and 2001. Parameter
1998
2001 ---------------------------------------------
----------------------------------- TDS mg/L
193 25
153 13 Nitrate-N
1.46 1.20 0.28 0.02 DOM
275 nm 0.84 0.67
0.16 0.01 Cadmium ug/L
2.16 0.30 2.61 0.50 Lead
ug/L 20.2 5.3
9.0 1.3 Copper ug/L
19.1 5.5 9.7
2.5 Gastropod sp. richness 0.5 0.2
(max 4) 2.7 0.7 (max12)
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Gastropod species present in Lake Winnipeg and
no. of occurrences (total 90). Valvata
tricarinata (13)
Pseudosuccinea columella (3 subfossil) V.
sincera helicoidea (2)
Planorbula armigera (14) Amnicola
limosa (6)
Helisoma anceps anceps (4) Probythinella
lacustris (7) H.
campanulatum (1) Cincinnatia
cincinnatiensis (5) H.
trivolvis (12) Lymnaea
stagnalis (5)
Gyraulus circumstriatus (9) Stagnicola
elodes (12) G.
deflectus (3) S.
catascopium catascopium (3) G.
parvus (8) Fossaria
dalli (3)
Aplexa hypnorum (4) F. decampi
(1)
Physa gyrina (23) F. exigua
(1)
P. integra (7) F.
modicella (3)
P. jennessi skinneri (1) F.
parva (1)
(P. winnipegensis n. sp.) (5)
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Bivalve species present in Lake Winnipeg and no.
of occurrences (n 90). Mussels Pyganodon
grandis (20) Lampsilis radiata
siliquoidea (29) L. ventricosa
(2) Strophitus undulatus
(8) Proptera alata
(2) Pea and Fingernail Clams Sphaerium nitidum
(1) S. rhomboideum
(4) S. lacustre
(10) S. striatinum
(1) Pisidium sp.
(1)