Page of 8 1 Year 11 Biology Ecosystem Dynamics @ Penrith Lakes (Population Dynamics - includes depth study modelling) Key Inquiry Question: What effect can one species have on the other species in a community? Students: ● investigate and determine relationships between biotic and abiotic factors in an ecosystem, including: (ACSBL019) - the impact of abiotic factors (ACSBL021, ACSBL022, ACSBL025) - the impact of biotic factors, including predation, competition and symbiotic relationships (ACSBL024) - the ecological niches occupied by species (ACSBL023) - predicting consequences for populations in ecosystems due to predation, competition, symbiosis and disease (ACSBL019, ACSBL020) - measuring populations of organisms using sampling techniques (ACSBL003, ACSBL015) ● explain a recent extinction event (ACSBL024) ● investigate changes in past ecosystems that may inform our approach to the management of future ecosystems ●. investigate practices used to restore damaged ecosystems, Country or Place, e.g.: - mining sites - land degradation from agricultural practices Name ________________________ Inquiry Question: How healthy is the Ecosystem at Penrith Lakes?
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Ecosystem Dynamics @ Penrith Lakes...2. Using column 5, fill in the bird numbers seen today. The teacher will guide you. Use this to work out abundance/distribution and then a habitat/food
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Page � of 81
Year 11 Biology Ecosystem Dynamics @ Penrith Lakes
(Population Dynamics - includes depth study modelling) Key Inquiry Question: What effect can one species have on the other species in a community? Students:● investigateanddeterminerelationshipsbetweenbioticandabioticfactorsinanecosystem,
7. Great Egret 7. Great Egret 58. Little Black Cormorant 8. Black Cormorant 49. Little Pied Cormorant 6 2 9. Pied Cormorant 410 Pacific Black Duck 8 10.Black Duck 311.Pelican 1 1 11.Pelican 5
12 Purple Swamphen 4 12.Purple Swamphen 413. Royal Spoonbill 13.Royal Spoonbill 514.White-faced Heron 1 14.Heron 515. Other:_______________ 15.Other 5Total Abundance per Site 11 13 24 Total point score
TODAYTotal Species per Site 3 5 4
1. On your walk - Look at the bird pictures. Once you and the teacher have ID the bird, tick the box. 2. Using column 5, fill in the bird numbers seen today. The teacher will guide you. Use this to work
out abundance/distribution and then a habitat/food supply point score.
Pelican q Little Pied Cormorant q
Little Black Cormorant q
Australian Grebe q
DIVERS
Eurasian Coot q
Pacific Black Duck q Dusky Moorhen q
Australian Wood Duck q
Black Swan q
SWIMMERS
Great Egret q
White-faced Heron q
Purple Swamphen q
WADERSRoyal Spoonbill q
Black winged Stilt q
Habitat total bird score?
0-10 Poor
11-18 Fair
19 - 25 Good
>25 Excellent
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STATION 3 Dipnetting - Invertebrate population sampling -
STATION 4 Waterbug (Invertebrate) I.D.
Name, picture & Sensitivity Rating
No.Bugs
Circle S.R.
Name, picture & Sensitivity Rating
No.Bugs
Circle S.R.
Back Swimmer 4
Water Beetle 3
Caddisfly Larvae 6
Water Boatman 4
Damselfly Nymph 6
Water Mite 5
Dragonfly Nymph 6
Water Scorpion 3
Freshwater Shrimp 6
Water Spider 4
Giant Water Bug 4
Water Treader 4
Leech 3 Worm 2
Mayfly Nymph 7
Mosquito Fish (vertebrate)
1
Pond Snail 3 Other
Total Bug SPECIES caught =(known as TAXA RICHNESS)
A Total Sensitivity Rating (S.R.) = This is a POLLUTION INDEX
B
Calculate a SIGNAL SCORE (S.S.). S.S. = Signal Score = Pollution Index (B) / Taxa Richness (A)
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1. Location: Final Detention Basin 2. Date: ___________________
3. Name of Ecosystem : Freshwater Ecosystem (not brackish or marine)
4. Describe the technique used to sample the abundance of invertebrates:
Using a dipnet, sweep the edge of the lake RANDOMLY for 10 - 15 mins
Interpreting your results using an UNWEIGHTED Signal Score. Step 2Using your signal score to determine a pollution rating.Use the table below.
Step 3A pollution indicator graph.Use your Signal Score and Taxa Richness to plot a point on the graph below.
5.6
S.S. 2.8 S.S.
0 6 12 Taxa Richness (A)
Signal Score Pollution Rating
> 3.5 Healthy Habitat
2.8 to 3.5 Mild
2.1 to 2.7 Moderate
< 2.1 Severe
Quad 3 - Some pollution
Quad 1 - Very Good Ecosystem
Quad 4 - Toxic, harsh Ecosystem
Quad 2 - Fair to good Ecosystem
(Using your bug numbers column you can calculate a WEIGHTED Signal Score.This is a post excursion activity. See your teacher for details on this method.)
Step 1 - With the help of the instructing teacher-fill out the table of the total waterbug survey results.