Identifying key stressors among the pack

Rossa Ó Briain&

Brian Coghlan

WATER VEG

MORPHOLOGY BARRIERS ????

at risk

prob at risk

not at risk

Dee: salmon (n=27)

WARD

BROADMEADOW

DELVIN

Geography

Aspect

Typology

Gradient

Substrate

Stream order

Water quality

Land use

Broadmeadow

Ward

Delvin

Vegetation

Hydromorphology

FISH

Water Quality

(CHEMISTRY + TEMP)

Hierarchical management decisions

RIVERSCAPE

River Veg Assessment

1. Instream

4. Land use

3. Bank face/ top

2. Marginal

5. Species diversity

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

6

6.5

7

7.5

8

Broadmeadow WARD DELVIN

SSSR

. sco

re

Water Quality Score not at risk

prob at risk

at risk

0

10

20

30

40

50

60

70

80

90

100

BMW WARD DELVIN

Hydromorph score

0

10

20

30

40

50

60

70

80

90

100

BMW WARD DELVIN

Vegetation scorehigh

moderate

Poor

good

high

moderate

good

Bad

Poor

Bad

0

10

20

30

40

50

60

70

80

90

100

Broadmeadow Ward Delvin

% c

ove

r% cover type

Tree Open Water Tall Herb

WARD

BROADMEADOW

DELVIN

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 1 2 3 4 5

°C

Day

Broadmeadow Ward Delvin

Max: Site 5_June 5th- July 5th

Delvin_site_5_2015

Broadmeadow_site_5_2015

Ward_site_5_2015

Broadmeadow_site_5_2013

0 20 40 60 80 100 120

Broadmeadow

Ward

Delvin

no. of brown trout

parr + adult

fry

0

5

10

15

20

25

30

35

1 5 9 13 17 21 25 29 33

Fre

qu

en

cy

Length (mm)

Broadmeadow

0

5

10

15

20

25

30

35

1 5 9 13 17 21 25 29 33

Fre

qu

en

cy

Length (mm)

Delvin

0

5

10

15

20

25

30

35

1 5 9 13 17 21 25 29 33

Fre

qu

en

cy

Length (mm)

Ward

Hydromorphology

Meanders/Flows/Pools/rifflesHyporheic exchange

Sediments

Degraded Riparian Water quality

TemperatureFlowAlgal boomsOxygen

Concentrates pollutants

Degraded Trout Habitat

Broadmeadow

Temperature

Channel form

Water Chemistry

Riparian enhancement

Channel manipulation

Point source/ diffuse

Ward Channel form

Water Chemistry

Channel manipulation

Point source/ diffuse

Delvin Water Chemistry Point source/ diffuse

River Pressures Measures

Hierarchical management decisions

SIN É