Chapter 11 Conclusion
B.7 Guided exploration tasks
Please Note:
• Above Mean Sea Level- henceforth referred to as “AMSL”
• Dry year- low water inflows into Te Waihora/Lake Ellesmere as a result of low rainfall.
• Wet year – high water inflows into Te Waihora/Lake Ellesmere as a result of high rainfall.
• Normal year – average daily rainfall values for 38 years from 1970 – 2007 representing a
typical year.
• Acceptable upper and lower limits of AMSLs to input into ElleVis should be between 200mm
and 1450mm.
• High lake level – above 1000mm AMSL
• Low lake level – below 600mm AMSL
• Moderate lake level- between 600mm AMSL and 1000mm AMSL
Establish the following scenario using ElleVis:
I.
Examine the above scenario under wet, dry and normal year conditions.
II.
Run ElleVis and observe the graphical displays.
III.
Answer the questions 1 to 3.
Scenario
From 18 April,
Open Lake at:
600mm AMSL
From 24 July,
Open Lake at:
1200mm AMSL
From 20 Sept,
Open Lake at:
1.
Which of the AMSLs below is more favourable to the Black Swan population (Figure
1)?
1.
Which of the AMSLs below is more favourable to the Pied Stilt population (Figure 2)?
above 1000mm
below 700mm
No idea
No difference
Figure 1: Black Swans
Source: Federation of NZ Aquatic Societies
Above 1000mm
Below 700mm
No idea
Doesn’t matter
Figure 2: Pied Stilt
2.
Which of the AMSLs below is more favourable to Black Flounder population (Figure
3)?
Establish the following scenario using ElleVis:
I.
Examine the above scenario under wet, dry and normal year conditions.
II.
Run ElleVis and observe the graphical displays.
III.
Answer the questions 4 and 5.
Above 1000mm
Below 700mm
No idea
No difference
Figure 3:Black Flounder
Source: Federation of NZ Aquatic Societies
Scenario
From 18 April,
Open Lake at:
500mm AMSL
From 21 July,
Open Lake at:
1150mm AMSL
From 20 Sept,
Open Lake at:
3.
Which of the AMSLs below is more favourable to Short-fin Eels (Figure 4)?
4.
Which of the AMSLs below is more favourable to Black-Billed gull (Figure 5)?
Above 1000mm
Below 700mm
No idea
No difference
Figure 4:Short-fin eels
Source: Federation of NZ Aquatic Societies
Above 1000mm
Below 700mm
No idea
No difference
Figure 5:Black-Billed gull
5.
The scenario below is good for Pied Stilts, Bullies and the Smelt (Figure 6) populations
during the summer months of January and March in a wet year.
Scenario
From 18 April,
Open Lake at:
1300mm AMSL
From 24 July,
Open Lake at:
1300mm AMSL
From 20 Sept,
Open Lake at:
1300mm AMSL
This scenario suggests that Lake Settlers and Farmers are being ignored. How can you improve
this scenario so that land inundation is minimal and also good for farmers grazing livestock
(cows) along the shoreline of Te Waihora/Lake Ellesmere during the same time period?
Are you able to improve this scenario for the Lake Settlers and farmers?
Yes
No
Figure 6: Smelt
6.
Using the scenario you created in question 6, which species will be threatened between
the months January and April of a normal year.
√= Months Threatened
Value
January
February
March
April
Livestock (sheep)
Little Shags
Pied Stilts
Banded dotterels
Black-Billed gulls
Black Swan
Australasian Bitterns
Kingfishers
Black flounder
Short-fin eels
Bullies
Smelt
7.
Using the scenario below, these birds (Little Shags, Black swans, Black-Billed gull,
Australasian Bitterns and the Kingfishers) happen to be in a tolerable state during the
summer months between December and January in a dry year. Do their conditions
improve in a wet year?
Scenario
From 1 April,
Open lake at:
1130mm AMSL
From 1 Aug,
Open lake at:
1050mm AMSL
Yes
No
No idea
No difference
For questions 9 -12, examine the following scenarios using ElleVis and use them where
applicable.
8.
Will the opening regime in Scenario 4 in the winter months (June – September) of a dry
year be suitable for Banded Dotterels (Figure 7)?
Scenario 1
Scenario 2
Scenario 3
Scenario 4
From 1 April,
Open lake at:
1130mm AMSL
From 1 Aug,
Open lake at:
1050mm AMSL
From 18 April,
Open Lake at:
600mm AMSL
From 24 July,
Open Lake at:
1200mm AMSL
From 20 Sept,
Open Lake at:
500mm AMSL
From 18 April,
Open Lake at:
500mm AMSL
From 21 July,
Open Lake at:
1150mm AMSL
From 14 Oct,
Open Lake at:
500mm AMSL
From 18 April,
Open Lake at:
1300mm AMSL
From 24 July,
Open Lake at:
1300mm AMSL
From 20 Sept,
Open Lake at:
1300mm AMSL
Yes
No
No idea
Figure 7: Banded Dotterels
9.
Will the opening regime in Scenario 3 in the summer months (December –March) in a
wet year be suitable for the Little Shag (Figure 8)?
10.Which of the following two scenarios in a normal year is more favourable to the
Kingfishers (Figure 9)?
Yes
No
No idea
Figure 8: Little Shag
Source: Federation of NZ Aquatic Societies
Scenario 1
Scenario 4
No idea
No difference
Figure 9: Kingfisher
11.Which of the following two scenarios in a wet year is more favourable to Bullies (Figure
10)?
Scenario 1
Scenario 2
No idea
No difference
Figure 10: Bullies
