INDEX OF BIOTIC
INTEGRITY

Presentation by
Livi Wilson and Jitendra Kumar
COF Mangalore

jitenderanduat@gmail.com
IBI
 A scientific tool used to identify and classify

water pollution problems.
 An IBI associates anthropogenic influen...
HISTORY
 Water quality act ( 1972) stimulated many

efforts to monitor the quality of water
resource systems
 It resulte...
Drawbacks
 They have not taken into account naturally

occurring geographic variations of
contaminants (eg:asbestos,iron,...
Cont…
 Chemical monitoring misses many of the

man-induced perturbations (eg:flow
alterations,habitat degradation,heated
...
Pollution
 Clean Water Act of 1977 defines pollution as

 “the manmade or man-induced alteration of
the chemical,physica...
Biological integrity

“the capability of supporting & maintaining a
balanced,integrated,adaptive community of
organisms ha...
Why monitor fish???
 Life history information is extensive for most

fish species
 Fish communities generally include a ...
Cont..
 Fishes are relatively easy to identify.

Technicians require relatively little training.
 Both acute toxicity (m...
Biotic integrity classes
class

Attributes

Excellent

Comparable to the best situations without influence of man, with mo...
Parameters used in assessment of fish
communities
Species composition &
richness

 Number of species

Ecological factors
...
IBI system
 Several species composition metrics are

evaluated
 Each fish species has characteristic tolerance

for wate...
Cont…
 Presence of intolerant species is an important

criterion
 Eg of intolerant species found in mid-western
warm wat...
Presence of hybrids
Hybridization probably occurs as a result of
habitat degradation
 Frequency of hybrids seems to incre...
Ecological factors
 When a site declines in quality ,the

proportion of individuals that are omnivores
increases
 The mo...
Cont…
<20% of individuals as omnivores as good
>45% omnivores to be badly degraded
 Presence of top carnivore is another
...
References
 Assessment of biotic integrity using fish

communities. Karr, J. R. 1981
 U.S.Environmental protection agenc...
jitenderanduat@gmail.com
Upcoming SlideShare
Loading in …5
×

Biotic integrity ppt

751 views

Published on

Published in: Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
751
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
15
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Biotic integrity ppt

  1. 1. INDEX OF BIOTIC INTEGRITY Presentation by Livi Wilson and Jitendra Kumar COF Mangalore jitenderanduat@gmail.com
  2. 2. IBI  A scientific tool used to identify and classify water pollution problems.  An IBI associates anthropogenic influences on a water body with biological activity in the water body, and is formulated using data developed from biosurveys  The IBI concept was formulated by Dr. James Karr in 1981 jitenderanduat@gmail.com
  3. 3. HISTORY  Water quality act ( 1972) stimulated many efforts to monitor the quality of water resource systems  It resulted in development of thresholds & criteria levels for specific contaminants ,often based on acute toxicity tests jitenderanduat@gmail.com
  4. 4. Drawbacks  They have not taken into account naturally occurring geographic variations of contaminants (eg:asbestos,iron,zinc)  Considered the synergistic effects of numerous contaminants  Not considered sub lethal effects of most contaminants(eg:reproduction,growth) jitenderanduat@gmail.com
  5. 5. Cont…  Chemical monitoring misses many of the man-induced perturbations (eg:flow alterations,habitat degradation,heated effluents)  In short ,criteria that emphasize physical & chemical attributes of water are unsuccessful for measuring biotic integrity jitenderanduat@gmail.com
  6. 6. Pollution  Clean Water Act of 1977 defines pollution as  “the manmade or man-induced alteration of the chemical,physical,biological & radiological integrity of water jitenderanduat@gmail.com
  7. 7. Biological integrity “the capability of supporting & maintaining a balanced,integrated,adaptive community of organisms having a species composition,diversity ,& functional organization comparable to that of the natural habitat of the region”(Frey 1977) jitenderanduat@gmail.com
  8. 8. Why monitor fish???  Life history information is extensive for most fish species  Fish communities generally include a range of species that represent a variety of trophic levels  Their position at the top of the aquatic food web in relation to diatoms & invertebrates also help to provide an integrative view of the watershed environment jitenderanduat@gmail.com
  9. 9. Cont..  Fishes are relatively easy to identify. Technicians require relatively little training.  Both acute toxicity (missing taxa) & stress effects (depressed growth & reproductive success) can be evaluated  Fishes are typically present ,even in the smallest streams & in all but the most polluted waters jitenderanduat@gmail.com
  10. 10. Biotic integrity classes class Attributes Excellent Comparable to the best situations without influence of man, with most intolerant forms, full array of age& sex classes; balanced trophic structure Good Species richness somewhat below expectation, loss of most intolerant forms, trophic structure shows some signs of stress Fair Signs of additional deterioration include fewer intolerant forms, more skewed trophic structure Poor Dominated by omnivores, pollution –tolerant forms,& habitat generalists, growth rate & condition factors commonly depressed ;hybrids & diseased fish often present Very poor Few fish present, mostly introduced or very tolerant forms; hybrids common ,disease, fin damage ,other anomalies regular No fish Repetitive sampling fails to turn up any fish jitenderanduat@gmail.com
  11. 11. Parameters used in assessment of fish communities Species composition & richness  Number of species Ecological factors  Number of individuals in  Presence of intolerant species  Species richness & composition of Darters,Suckers,Sunfish  Proportion of Hybrid individuals     sample Proportion of Omnivores Proportion of Insectivores Proportion of top carnivores Proportion with disease ,tumor, fin damage, other anomalies jitenderanduat@gmail.com
  12. 12. IBI system  Several species composition metrics are evaluated  Each fish species has characteristic tolerance for water quality ,habitat,& other conditions  Within each family,sets of species may be ranked for their tolerances jitenderanduat@gmail.com
  13. 13. Cont…  Presence of intolerant species is an important criterion  Eg of intolerant species found in mid-western warm waters include rock bass. Banded darter,longear sunfish….  Another metrics is the presence & abundance of green sunfish ,often the dominant or only sunfish present at degraded sites(>20% of individuals indicate degraded condition) jitenderanduat@gmail.com
  14. 14. Presence of hybrids Hybridization probably occurs as a result of habitat degradation  Frequency of hybrids seems to increase in modified streams  Finally in very degraded conditions, hybrids of carp & goldfish become quite common jitenderanduat@gmail.com
  15. 15. Ecological factors  When a site declines in quality ,the proportion of individuals that are omnivores increases  The most degraded streams are commonly support large population of the omnivores(gold fish)  Their dominance is due to degradation of food base, especially invertebrates. jitenderanduat@gmail.com
  16. 16. Cont… <20% of individuals as omnivores as good >45% omnivores to be badly degraded  Presence of top carnivore is another important indicator Viable & healthy population of top carnivore species indicate a relatively healthy,trophically diverse community jitenderanduat@gmail.com
  17. 17. References  Assessment of biotic integrity using fish communities. Karr, J. R. 1981  U.S.Environmental protection agency (EPA)”BIOLOGICAL INTEGRITY” jitenderanduat@gmail.com
  18. 18. jitenderanduat@gmail.com

×