Latest Findings

Sites

Commentary from Full Monitoring on August 22nd 2018

Weather station: Temperature was cool 9.1-9.4oC. Wind speed fluctuated between 17.2-7.2 km/h, and direction changed from SSW to WSW.

No significant rainfall over the last three days

 

Site 1

1035

High water level, strong ripples, clear water, strong breeze, slight showers, 90% cloud cover (ccv)

Seagrass still covered by sediments or a layer of alga, some patches looked cropped by swans, a lot of bs poo close to the shore, Canadian pondweed (cpw) pieces common floating on the surface and caught in the bucket sweep.

Bucket sweep-1 dead common bully, 2 water boatmen, abundant Amphipods, one water flea, multiple small snails, 3 Physa snails.

70-80 BS, 20+ Black-backed gulls, 3 Paradise ducks.

Site 2

Cold wind from the south, complete cloud cover, small chop on water surface.

Good growth of seagrass, cpw growing well inside the patches of seagrass, all covered with a layer of dark green alga.

Bucket sweep- 30 Amphipods, abundant Daphnia in the water column, 8 small snails.

Site 3

Water clear, much lower than last visit, cold south wind.

Site 4

Overcast, light rain, light wind, cold.

Small random patches of Milfoil and weak growth of seagrass

Bucket sweep-15 Amphipods, 3 shrimp, 2 larger Amphipods (different species ??), 12 Blood worms/Chironmous, 6 small snails and 3three segmented worms/pink colour.

Site 5

Very windy and rainy and yuk! Low water levels and lots of bird feet marks in the ground.

Weak growth of Seagrass

Bucket sweep-3 shrimp, and some small snails.

DATA COMMENTARY. We are comparing our data with July 25th.

  • 164 Black Swans on the upper lagoon, including 164 cygnets..SPRING!!
  • Water levels lower
  • Water temperature slightly lower
  • DRP –slightly lower in the upper lagoon, lower in the stream
  • NNN-lower in the stream but still significant and lower in the lower lagoon
  • Chlorophyll a – slight decrease at all sites but good signs of biological activity
  • E coli- The stream and Site 5 in the lower lagoon exceed our guideline values.

 


Commentary from Full Monitoring (FM) at Tomahawk Lagoon (TL) on July 25th 2018.

Weather;

Air temperature ranged from 6.5 oC at 10.39 to 8.8 oC at 2.00. A cool day.

The wind was starting to build through out the day, 6.4km/h -9.7 km/h at 2.00.

Wind direction ENE

No rainfall during the day, 16 mm rain fell over the previous 4 days.

 

Site 1

10:40 am

65%ccv, light breeze, slight ripple, water very clear, cold day.

Abundant sea grass covered with silt, some pieces of Canadian pondweed.

Water boatman observed swimming in the weed along with many water fleas (Daphnia sp)

Abundant amphipods, one caddis fly larvae, abundant small snails and two Physa snails.

21 Black swans including 3 cygnets. Observed feeding very close to the hall.

 

Site 2

12:20 pm 

Sunny,cold wind from the east, ripples on clear water, very clear!!!

Abundant and healthy sea grass and pieces of Canadian pond weed.

Lots of Daphnia, abundant Amphipods and small snails, 2  Dytiscid beetles or water beetles.

Many birds all recorded on the e bird site.

 

Site 3

12:40 pm

Clear sky and cold wind, stream high and cloudy. No stock in the paddock.

 

Site 4

13:25 pm 

Continuous ripples, nor’easter wind, no clouds, very clear water, cold, relatively few birds.

A piece of Milfoil floated passed by, some weak patches of seagrass growing.

Our bucket sweep-12 shrimps, 3 amphipods, 2 small snails and 6 bloodworms (Chironmous midges).

 

Site 5

11:15 am

Moderate amount of water, very cold, breezy, a bit cloudy.

Weak patches of seagrass.

Bucket sweep-abundant Amphipods, few small snails.

 

DATA COMMENTS compared with 27th June.

1: 

Water levels have remained high due to rainfall on previous days

2:

Site 4 and 5 show a slight decrease in salinity most likely due to extra freshwater falling and flowing through the catchment.

3:

Water is very clear esp at S1 and 2 and cold.

4: 

DRP remains at quite a high concentration in the upper lagoon.

5:

NNN remains high at most sites but very high in the stream flowing into the lagoon.

6:

E. coli levels lower at all sites, S5 still exceeds guideline values.

Low water temperatures will slow down the bacteria growth and reproduction.

7:

Algal levels have increased in the lower lagoon.

8:

Bird numbers high in the upper lagoon, this is due to the significant growth of Seagrass in the upper lagoon.

 

Updated 4/09/2018