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Grindsted Engsø Miljøtilstand og ... - Billund Kommune

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5.4 De frie vandmasser .............................................................................. 32<br />

5.4.1 Iltforhold ............................................................................................. 32<br />

5.4.2 Sigtdybde (vandets klarhed) .................................................................. 32<br />

5.4.3 Klorofyl-a ............................................................................................ 33<br />

5.4.4 Suspenderet stof .................................................................................. 33<br />

5.4.5 Farvetal .............................................................................................. 34<br />

5.4.6 Fosfor ................................................................................................. 34<br />

5.4.7 Kvælstof .............................................................................................. 35<br />

5.4.8 Silicium ............................................................................................... 36<br />

5.4.9 pH <strong>og</strong> alkalinitet ................................................................................... 36<br />

5.4.10 Kviksølv <strong>og</strong> andre miljøfremmede stoffer ................................................. 37<br />

5.4.10.1 Overvågning for miljøfremmede stoffer i <strong>Grindsted</strong> Å 2006 ........................ 37<br />

5.4.10.2 Udledning af miljøfremmede stoffer fra dambrug i 2004 <strong>og</strong> 2005 ................ 39<br />

5.4.10.3 Undersøgelse af søvandet for miljøfremmede stoffer i 2007 ....................... 40<br />

5.4.10.4 Vandkvalitetskrav for overfladevand ....................................................... 41<br />

5.5 Samlet vurdering af søens aktuelle fysiske <strong>og</strong> kemiske tilstand .................. 41<br />

6 Sediment ........................................................................................... 43<br />

6.1 Resumé af status i 2001 ........................................................................ 43<br />

6.1.1 Fosfor <strong>og</strong> jern ...................................................................................... 43<br />

6.1.2 Tungmetaller <strong>og</strong> pesticider .................................................................... 43<br />

6.1.3 Vurdering <strong>og</strong> udvikling .......................................................................... 44<br />

7 Plankton ............................................................................................ 45<br />

7.1 Planteplankton 2004 ............................................................................. 45<br />

7.1.1 Artssammensætning ............................................................................. 45<br />

7.1.2 Biomasse ............................................................................................ 45<br />

7.2 Dyreplankton 2004 ............................................................................... 45<br />

7.2.1 Artssammensætning ............................................................................. 45<br />

7.2.2 Biomasse ............................................................................................ 45<br />

7.3 Vurdering af udviklingen i planktonsamfundet .......................................... 45<br />

8 Vegetation ......................................................................................... 47<br />

8.1 Undervandsvegetationens artssammensætning i 2004 .............................. 47<br />

8.2 Undervandsvegetationens dybdeudbredelse, fladeudbredelse <strong>og</strong><br />

dækningsgrad ...................................................................................... 48<br />

8.3 Samlet vurdering af vegetationens udvikling ............................................ 48<br />

9 Bundfauna ......................................................................................... 50<br />

9.1 Artsrigdom i 2004 ................................................................................. 50<br />

9.2 Individtæthed i 2004 ............................................................................ 50<br />

9.2.1 Bundfaunaens udbredelse ...................................................................... 51<br />

9.3 Samlet vurdering af bundfaunaen ........................................................... 51<br />

10 Fisk ................................................................................................... 53<br />

10.1 Fiskefaunaens sammensætning .............................................................. 53<br />

10.2 Fiskefaunaens mængdemæssige sammensætning <strong>og</strong><br />

størrelsesmæssige struktur .................................................................... 54<br />

10.3 Biomanipulation ................................................................................... 56<br />

10.3.1 Opfiskningen ........................................................................................ 57<br />

10.4 Nuværende status ................................................................................ 57<br />

10.5 Stabilisering af bestanden ..................................................................... 57<br />

10.6 Tungmetaller i fisk ................................................................................ 58<br />

<strong>Billund</strong> <strong>Kommune</strong><br />

<strong>Grindsted</strong> <strong>Engsø</strong> – miljøtilstand <strong>og</strong> fremtidsmuligheder<br />

April 2008<br />

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