A Nutrient Biotic Index (NBI) for Use with Benthic ... - NBI.pdfNBI-P Score 0 2 4 6 8 10 NBI-P Score...
Transcript of A Nutrient Biotic Index (NBI) for Use with Benthic ... - NBI.pdfNBI-P Score 0 2 4 6 8 10 NBI-P Score...
A Nutrient Biotic Index (NBI) for Usewith Benthic Macroinvertebrate
Communities
A Nutrient Biotic Index (NBI) for UseA Nutrient Biotic Index (NBI) for Usewith Benthic Macroinvertebratewith Benthic Macroinvertebrate
CommunitiesCommunitiesA.J. Smith, R.W. Bode, and G.S. Kleppel
NYS DEC Stream BiomonitoringA.J. Smith, R.W. Bode, and G.S. KleppelA.J. Smith, R.W. Bode, and G.S. Kleppel
NYS DEC Stream BiomonitoringNYS DEC Stream Biomonitoring
OutlineOutline• Development of the NBI
– Deriving Nutrient Optima
– Creating Scale of Eutrophication
– Impairment Thresholds
– Brief Comparison w/Diatoms
Nutrient Biotic IndexNutrient Biotic Index• Question
– How can we estimate the degree of enrichment?
• Nutrient Biotic Index– Linear Scale of Eutrophication
• Oligotrophic Eutrophic
• Importance– Assist in reporting– Assist in site prioritizing– Nutrient criteria
Nutrient Biotic IndexNutrient Biotic Index• 1993 - 2002• 185 different sampling events
– 129 different Locations– On 116 different streams– Chemistries and Invertebrates
Nutrient Biotic IndexNutrient Biotic Index• Chemistries were averaged
– Within 90 days prior to invertebratesampling date
– Split NO3- and TP values into Bins
(ranges)• 15 bins• Between 11 and 14 sites in each
Nutrient Biotic IndexNutrient Biotic Index
• Weighted Averaging used theproportion of times a taxon waspresent w/in bins
– Established nutrient optima
• Basis for tolerance values
• Site Index scores are calculated usingtolerance values
Nutrient Biotic IndexNutrient Biotic Index
Acroneuria abnormisTP optimum = 0.0151 mg/lTolerance Value = 0
TP Bin Ranges (mg/l)
0.00890.0120
0.01510.0175
0.01930.0233
0.02950.0366
0.04730.0565
0.06500.0927
0.10750.1633
0.5558
Freq
uenc
y of
Occ
urre
nce
0
1
2
3
4
5
Nutrient Biotic IndexNutrient Biotic Index
Gammarus sp.TP optimum = 0.1017 mg/lTolerance Value = 8
TP Bin Ranges (mg/l)
0.00890.0120
0.01510.0175
0.01930.0233
0.02950.0366
0.04730.0565
0.06500.0927
0.10750.1633
0.5558
Freq
uenc
y of
Occ
urre
nce
0
2
4
6
8
10
B1B2
B3B4
B5B6
B7
B8
B9B10
B11
B12B13
B14B15
Additive tree cluster of Nitrate binsbased on mean pair-wise Bray-Curtis similarity
Additive tree cluster of Nitrate binsbased on mean pair-wise Bray-Curtis similarity
Eutrophic> 0.98 mg/l
Mesotrophic> 0.24 – 0.98 mg/l
Oligotrophic< 0.24 mg/l
B1
B2B3
B4
B5
B6B7
B8
B9B10
B11
B12B13
B14B15
Additive tree cluster of Total P binsbased on mean pair-wise Bray-Curtis similarity
Additive tree cluster of Total P binsbased on mean pair-wise Bray-Curtis similarity
Eutrophic> 0.065 mg/l
Mesotrophic> 0.0175 - 0.065 mg/l
Oligotrophic< 0.0175 mg/l
NBI-N and NitrateNBI-N and Nitrate
NO3- Trophic State
Oligotrophic Mesotrophic Eutrophic
NB
I-N S
core
0
1
2
3
4
5
6
7
8
9
10
(0.24mg/l) (0.98mg/l) (5.66mg/l)
NBI-P and TPNBI-P and TP
TP Trophic State
Oligotrophic Mesotrophic Eutrophic
NB
I-P S
core
0
1
2
3
4
5
6
7
8
9
10
(0.065 mg/l)(0.0175 mg/l) (0.556 mg/l)
Water Quality - NitrateWater Quality - Nitrate
NO3- Trophic State
Oligotrophic Mesotrophic Eutrophic
Perc
ent o
f Sam
ples
0
10
20
30
40
50
60
70
Non ImpactedSlightly ImpactedModerately Impacted
Water Quality - TPWater Quality - TP
TP Trophic State
Oligotrophic Mesotrophic Eutrophic
Per
cent
of S
ampl
es
0
10
20
30
40
50
60
70
Non ImpactedSlighty ImpactedModerately Impacted
Impairment ThresholdsImpairment Thresholds• Meso/Eutrophic boundaries
– Nitrate• > 0.98 mg/l• NBI-N Score > 6.0
– Total Phosphorus• > 0.065 mg/l• NBI-P Score > 6.1
NBI-P and DTINBI-P and DTI
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35Summ.TP
3
4
5
6
7
TPsc
ore
0.0
0.2
0.4
0.6
0.8
1.0
DTI
TPscoreDTI
DTI Score
0.0 0.2 0.4 0.6 0.8 1.0
NB
I-P S
core
0
2
4
6
8
10
NBI-P Score = 2.99 + 4.15(DTI Score)r = 0.82; p < 0.0001; n = 32
ConclusionsConclusions• NBIs provide a meaningful measure of
enrichment
• Trophic state boundaries have directrelationship with biota
• Together they provide monitoring andenforcement mechanisms for nutrientcriteria
• Similarity to diatom indices shows promise
AcknowledgementsAcknowledgements• Bob Bode, Margaret Novak, Larry Abele, and
Diana Heitzman
• Scott Stoner
• Ken Markussen, and NYC SDWF
• Gary Kleppel, George Robinson
• Karen Riva-Murray, Pat Phillips, Doug Burns,Barry Baldigo, Mike McHale