Post on 30-Jan-2016
description
ISAC Irfon surveys
DiatomsWater chemistry
Ingrid JüttnerNational Museum Wales
Pre-ISAC limingJan 2011
June 2011
Post-limingSep 2011Dec 2011Feb 2012May 2012
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
Jan 2011 Jun 2011 Sep 2011 D ec 2011 Feb 2012 M ay 2012
C atchm ent nearIrfon source
D evil’s s ta ircaseu/s d /s N ant y R h iw
d/s N ant y Fedwu/s Abergw esyn
d/s Abergw esyn 6.5
M ed ian pHpH
6.0
6.05.8
5.4
IF 31
IF 32
IF 33
IF 36
IF 22
IF 37
IF 10
IF 8
IF 1M
pH at m a in stream Irfon s itesJanua ry 2011 - M ay 2012
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
Jan 2011
Sep 2011M ay 2012
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
IF31 IF32 IF33 IF36 IF22 IF37 IF10 IF8 IF1M
Jan 2011
Dec 2011
M edium
Flow
M edium
Pre-lim ing
Pre-lim ing
Post-lim ing
pH
M edium
High
Low
Ffos yr lâr
Nant y G
orlan
Nant y C
loddiad
Nant y R
hiw
Nant y F
edw
Nant Hir
Nant Byr
Abergwesyn
Nant Shinglas
Nant Rhyd goch
IF40 at P
wll y B
o
Nant y W
alch
Nant Henog
pH at m ain stream
Irfon s itesJanuary 2011 -
M ay 2012
Liming successfulat low and mediumflow
Liming insufficientat high flow
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
IF 22 IF 10 IF 8 IF 1M
Ju l 2007
Jan 2008
M ay 2008
Jan 2011
Jun 2011
S ep 2011
D ec 2011Feb 2012
M ay 2012
pH at m ain stream Irfon s ites
pH ISH / IS AC pro ject
pHISH
ISACpre-lim ing
ISACpost-lim ing
F low
low
low
m edium
m edium
high
high
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
Jan 2011 Jun 2011 Se p 2 011 D ec 2 011 Feb 20 12 M ay 2012
IF30
pH
IF34
IF35
IF25
IF24IF38
IF12IF6
pH at lim ed and un lim ed Irfon tribu tariesJanuary 2011 - M ay 2012
0
0 .5
1
1 .5
2
2 .5
3
1 /11 6 /11 9 /11 1 2/11 2 /12 5 /12
IF 1
IF 8
IF 10
IF 37
IF 22
IF 36
IF 33
IF 32
IF 31
0
5 0
1 00
1 50
2 00
2 50
1 /11 6 /11 9 /11 1 2/11 2 /12 5 /12
IF 1
IF 8
IF 10
IF 37
IF 22
IF 36
IF 33
IF 32
IF 31
µg/L
m g/LC a concentrations a t Irfon s ites
A l concentrations a t Irfon s ites
Water chemistry
0
1
2
3
4
5
6
7
1 /11 6 /11 9 /11 12/11 2 /12 5 /12
IF 40
IF 6
IF 38
IF 24
0
50
100
150
200
250
300
350
1 /11 6 /11 9 /11 12/11 2 /12 5 /12
IF 40
IF 6
IF 38
IF 24
µg/L
m g/LC a concentra tions a t Irfon tribu taries
A l concentrations a t Irfon tribu taries
Water chemistry
BrainWalchByrRhiw
Diatoms assemblage change in the Irfon
Irfon near source
u/sFfos yr lârNant y Gorlan
d/sFfos yr lârNant y Gorlan
Devil’s staircaseu/s Nant y Rhiw
Devil’s staircased/s Nant y Rhiw
d/s Nant y Fedw
upper catchm entlower catchm ent
u/s Irfon / Afon Gw esynconfluence
Pwll y Bo
u/s Llanwrtyd Wells
EunotiaPinnularia
/EunotiaEunotia /Achnanthidium
Achnanthidium /Fragilaria
Acid sensitive Acid tolerant
1/11
2/12
5/12
1/11
9/11
1/11
12/11 5/12
6/11
9/11
9/11
2/12
6/11
6/11
2/12
12/11
12/115/12
Diatoms assemblage change after lim ing, Irfon
d/s Nant y Fedw
u/s Irfon / Afon G wesynconfluence
Pwll y Bo
Post lim ing surveys Lim ing sum mer 2011: m ore acid sensitive diatom s at all sites
Lim ing spring 2012: m ore acid sensitive diatom s only at Pwll y Bo
!
!
!
!!!
A cid sensitive A cid to le rant
5/12
6/11
1/11
9/11
12/11
12/11
2/129/11
6/11
5/12
2/12
2/12
5/121/11
1/11
9/116/1112/11
!!
!
Post lim ing surveys Lim ing sum mer 2011: m ore acid sensitive diatom s at all sites
Lim ing spring 2012: no effect
!!!
Diatoms assemblage change after lim ing
d/sFfos yr lârNant y Gorlan
Devil’s staircaseu/s Nant y Rhiw
Devil’s staircased/s Nant y Rhiw
A cid sensitive A cid to le rant
Diatom species composition in the Irfon
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
E u no e x ig
Ta be flo c
F ra g cag r
A ch nm in u
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
E u no e x ig
Ta be flo c
F ru se rif
A ch no b lo
F ra g cag r
A ch nm in u
Pwll y Bou/s Llanwrtyd W ells
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
E u no e x ig
E u no inc i
Ta be flo c
G o m p pa e x
A n om v itr
A ch nm in u
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
E u no e x ig
E u no inc i
Ta be flo c
A n om v itr
F ra g cag r
A ch nm in u
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
E u no e x ig
E u no inc i
Ta be flo c
G o m p pa e x
A n om v itr
A ch nm in u
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
E u no e x ig
E u no inc i
E u no rh om
Ta be flo c
G o m p pa e x
A n om v itr
A ch nm in u
Diatom species composition in the Irfon
u/s Nant y Rhiwd/s Nant y Rhiw
d/s Nant y Fedwu/s Irfon / Afon Gw esyn confluence
! !
! !
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
E u no e x ig
P inn su bc
G o m p pa e x
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
P inn su bc
E u no e x ig
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /1 2 5 /1 2
E u no e x ig
E u no rh om
E u no sp ec
P inn su bc
Diatom species composition in the Irfon
Irfon near sourceu/s Ffos yr lâr / Nant y Gorlan
d/s Ffos yr lâr / Nant y Gorlan
Nant y Brain
Nant y Walch
Nant Byr
Nant HirNant y Rhiw
1/11
1/11
1/11
1/11
1/11
6/11
6/11
6/11
6/11
6/11
2/12
2/12
2/12
2/12
2/12
5/12
5/12
5/12
5/12
5/12
9/11
9/11
9/11
9/11
9/11
12/11
12/11
12/11
12/11
12/11
!
!
!
!
!
!
!
Lim ing sum mer 2011: m ore acid sensitive diatom s at all sitesLim ing spring 2012: m ore acid sensitive diatom s at two sites
Post lim ing surveys
Diatoms assemblage change after lim ing, tributaries
A cid sensitive A cid to le rant
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /12 5 /12
E u no ex ig
A chn o blo
G o m pp arv
F ra gca g r
A chn m inu
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /12 5 /12
E u no ex ig
A n om v itr
A chn m inu
Diatom species composition in Irfon tributaries
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /12 5 /12
E un o ex ig
G o m pp arv
F ra gca gr
A chn m in u
Nant y Brain Nant y Walch
Nant Byr
0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
1 00
1 /11 6 /11 9 /11 1 2/11 2 /12 5 /12
E u no ex ig
E u no sub a
G o m pp arv
F ra gca g r
A chn m inu
Nant y Rhiw
! !
!!!
Conclusions
pH is higher after liming during low and medium flow,
but not during high flow
pH during ISAC is higher than during pHISH
More acid sensitive diatoms found after the summer 2011 liming
Very few effects of the spring 2012 liming after prolonged rain fall