Distribution and Biomass of Macrophytes Growing Near Streams.
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Transcript of Distribution and Biomass of Macrophytes Growing Near Streams.
![Page 1: Distribution and Biomass of Macrophytes Growing Near Streams.](https://reader036.fdocuments.net/reader036/viewer/2022081504/56649d8d5503460f94a7519d/html5/thumbnails/1.jpg)
Distribution and Biomassof Macrophytes Growing Near Streams
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North End
Graywood
U.S.D.A. Project Macrophyte Study SitesExperimental Controls
Beds dominated by
milfoil near stream outlets
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Eagle Point
Long Point
Old Orchard Point
McPherson Point
Sand Point
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McPherson Point Gully
Long Point
Long Pt. Cove
Hartson Point
Cottonwood Cove
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Sutton Point
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Macrophyte Studies Project Goals:
• Monitor changes in biomass and standing crop, focusing on areas dominated by Eurasian watermilfoil near streams.
• Establish the relationship between nutrient loading, macrophyte biomass and standing crop
• Characterize changes in areas associated with control and experimental watersheds to determine the effectiveness of BMPs in reducing plant growth.
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Graywood Gully
#1
#2
Transects #3
• 2-4 quadrat samples collected by divers at 1, 2, 3, 4 m
• Swimmer tracks the perimeter of the milfoil while boat with Trimble GPS operator follows
• Plants are separated by species and weighed
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August 2003 Average and S.D. for all sites. Each number is average of 2-4 quadrats.
Tran Latitutde DepthLocation # (minutes) 1 m 2 m 3 m 4 m
1 44.459 N 31 + 29 199 + 130 61 + 45 12 + 10Sutton Point 2 44.511 N 17 + 11 113 + 38 60 + 32 9 + 8
3 44.563 N 39 + 22 270 + 25 103 + 60 4 + 31 45.441 N 32 + 21 154 + 10 121 + 89 18 + 8
Cottonwood Gully 2 45.496 N 32 + 2 160 + 53 123 + 56 11 + 33 45.544 N 72 + 17 128 + 40 171 + 7 141 46.598 N 13 + 2 169 + 65 247 + 45 11 + 5
McPherson's Point 2 46.654 N 29 + 12 609 + 13 295 + 24 45 + 533 46.692 N 6 + 4 128 + 66 98 + 41 9 + 41 46.497 N 19 + 11 89 + 5 135 + 35 18 + 6
Long Point Cove 2 46.552 N 25 + 9 --- 126 + 68 ---3 46.584 N 45 + 37 301 228 + 85 ---
Long Point 1 46.778 N --- 204 + 18 75 + 31 ---1 47.173 N 28 + 10 --- --- ---
Sand Point Gully 2 47.21 N 36 + 8 346 + 150 234 + 140 21+ 153 47.242 N 36 + 23 245 + 30 335 + 168 50+ 211 48.552 N 69 + 49 107 + 12 81 + 15 36 + 24
Graywood Gully 2 48.614 N 40 + 24 204 + 126 133 + 72 95 + 603 48.652 N 69 + 33 80 + 33 81+ 3 178 + 83
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Comprehensive data set now includes four summers.
Average Surface StandingBiomass Area Crop
Location Year grams . m-2 m2
Kg Dry WeightSutton Point 2000 184 + 43 --- --- +++ 2001 467 + 183 8,592 4,017 * 2002 71 + 40 3,688 262
x 2003 138 + 92 11,819 1631
Cottonwood Gully 2000 193 + 85 --- --- ++ 2001 373 + 168 9,387 3,501 *** 2002 316 + 134 7,360 2,326
2003 146 + 41 3,750 548
McPherson's Point 2000 262 + 134 23,192 6,192 +++ 2001 459 + 202 25,783 11.834 ** 2002 151 + 74 12,004 1,813
x 2003 237 + 106 19,760 4,683
Long Point Cove 2000 252 + 35 --- --- ++ 2001 303 + 164 26,498 8,026 ** 2002 247 + 140 26,093 6,444
x 2003 195 + 85 24,554 4,788
Long Point ** 2002 212 + 159 3,123 662 x 2003 140 + 68 1,440 202
Sand Point Gully 2000 212 + 29 9,535 2, 021 +++ 2001 484 + 300 9,781 4,730 *** 2002 325 + 82 7,354 2,390
x 2003 290 + 120 5,310 1,540
Graywood Gully 2000 238 --- --- +++ 2001 412 + 162 36,148 14,897 ** 2002 193 + 123 6,703 1,294
x 2003 131 + 76 14,186 1,858
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0
100
200
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800
0 100 200 300 400 500 600 700 800
2001 Macrophyte Dry Weights (g . m-2)
R2 = 0.04 p = 0.26
0
100
200
300
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600
700
800
0 100 200 300 400 500 600 700 800
2002 Macrophyte Biomass (g/ m sq.)
20
03
Macro
ph
yte
Bio
mass (
g/
m
sq
.)
Comparison of August Biomass Over Last Three Years
2001 vs. 2002
2002 vs. 2003
2001 vs. 2003
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Changes in the distribution of
Eurasian Watermilfoil
within individual beds
such as Graywood gully
0
10
20
30
40
50
60
70
80
90
% E
urasia
n W
aterm
ilfo
il 0
10
20
30
40
50
60
70
80
90
% E
urasia
n W
aterm
ilfo
il
1m 2m 3m 4m Stream
1m 2m 3m 4m Central
1m 2m 3m 4m North
Stations are 100-150 m apart along
shore
NM = no milfoil
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0
5000
10000
15000
20000
25000
30000
35000
40000B
ed
Su
rface
Are
a (
sq. m
)
20002001
20022003
ND NDND ND
Annual Changes in Milfoil Bed Surface Area
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0
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20000
25000
30000
35000
40000B
ed
Su
rface
Are
a (
sq. m
)
20002001
20022003
ND NDND ND
Annual Changes in Bed Surface Area
W 2001
W 2001
W 2001
W 2001
W 2002
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0
2000
4000
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10000
12000
14000
16000
Sta
nd
ing
Cro
p (
Kg
DW
)
20002001
20022003
ND NDND ND
Annual Changes of Standing Crops in Milfoil Dominated Areas
W 2001
W 2001
W 2001
W 2001
W 2002
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100
1000
10000
20000
0.0001 0.001 0.01 0.1 1Loading Total Phosphorus (Kg/day) Sept - Dec
Conesus LakeMacrophyte Standing Crop vs. Stream Loading
of Total Phosphorus
R2 = 0.93p = 0.035
JJ
J
J
JJ
R2 = 0.79p = 0.019
2001
2002
2000R2 = 0.83p = 0.012
Relationship of Macrophyte Standing Crop to Average Daily Loading for USDA watersheds
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Eagle Point
Long Point
Old Orchard Point
McPherson Point
Sand Point
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Loading Prediction Curves for Long Point Cove and North Gully
y = 0.1001x
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.0000 0.1000 0.2000 0.3000 0.4000 0.5000
North McMillan (Kg)
Nor
th G
ully
TP
(Kg)
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Relationship of Standing Crop to Total Phosphorus Loading by Streams, Summer
2003
R2 = 0.9251p< 0.01
0
1000
2000
3000
4000
5000
6000
0 0.05 0.1 0.15 0.2 0.25 0.3
Kg Total Phosphorus/ Day(Nov 1 2002 to Oct 31 2003)
Sta
nd
ing
Cro
p (
Kg
)
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Progress:
• Better understanding of dynamic nature of milfoil growth
• Established possible cyclical pattern of bed growth
• Loading prediction curve for Long Pt. Cove
• Continued to document statistically significant relationship between stream loading of TP and standing crop
Goals for 2004:
• North McMillan loading prediction curve
• Refine estimates of standing crops
• Comparison of trends in experimental and control beds
• Seasonal changes in sediment nutrient levels