This Saturday July 28th, we are inviting people to join us
for an activity at one of our on-going project sites. The aim is to remove wire tree-guards from successfully plantings which are part of the recovery from 2009 bushfires.
Meeting point is the Tarra-Bulga Visitors centre at 10am and the activity will finish around 1pm. Please let us know if you intend to come along in case there are any change of plans. Phone 0488 035 314 or email: firstname.lastname@example.org
Another great turnout of 34 volunteers for this year’s survey, our annual Lyrebird Survey is by far our most popular activity and once again we were able to cover all 16 monitoring sites.
Weather conditions were quite good, at 5.30am heading up to Balook there was a substantial amount of moonlight with a clear sky and some cold air, At Balook however it was darker because of cloud cover blocking the moonlight and there was a slight breeze in the treetops.
Our full crew of volunteers arrived in good time and by 6.30am everyone had arrived and signed in and by 6.45am everyone had been briefed on their tasks and had headed out in the dark to their assigned monitoring stations.
Once in position there ended up being quite an unexpectedly long wait until Lyrebird calls were first heard, only a couple of locations recorded birds calling before 7am; which was when the majority of the sites started hearing birds, the latest any group had to wait to record any calls was 7.10am. Last year (2017) every site had birds calling by 6.55am.
The official sunrise time for Saturday June 2nd at Balook was 7.22am and first light was scheduled to appear at 6.52am which was almost identical to last year.
From our results we detected 8 birds calling in our search area, this figure was slightly down on recent years. It is hard to read too much into one years results but potentially the dry summer and autumn we have experience may be having an impact. Most birds appeared to be calling from forest areas with established Eucalyptus over-storey or rainforest. It would be great if some action can be taken to re-establish the original canopy species into areas of the park that have been degraded.
As usual we only count birds that are detected by at least 2 monitoring stations and some stations heard birds calling that were not in our survey area so are not included in the final tally.
Thanks again to AGL who generously supported the breakfast provided for the early rising volunteers.
Lyrebird Survey Results Summary Table 2010-2018
Number of Males Calling
(out of 16)
|2011||9||13||Windy making it hard to hear calls, especially in the more exposed sites.|
|2012||9||12||Still and Calm|
|2013||3||10||Wet, may have discouraged birds from calling. Several males sighted feeding but not calling.|
|2014||14||15||Perfect calm morning|
|2016||9||15||Ideal – slight wind, relatively warm|
|2017||11||16||Ideal – slight wind, relatively warm|
|2018||8||16||A little overcast with a slight breeze.|
- We had a fantastic turnout of volunteers, which meant that all 16 sites could be covered with at least 2 volunteers at each site. (This is the first time we have covered all 16 sites since at least 2010).
- Weather conditions were ideal (2nd year running) with little or no wind to muffle the sound of calls and it was not really all that cold!
- Everyone got out to their respective positions in time; the earliest call was heard at 6.49am and by 6.55am every monitoring station had Lyrebirds calling.
- The official sunrise time for Saturday Jun 3rd at Balook was 7.23am and first light was scheduled to appear at 6.53am. So, it seems Lyrebirds are fairly well tuned to begin calling at first light.
- From our results, we detected 11 male birds calling, (not sure if it would be possibly with our method to detect two birds calling in close proximity to each other, but a couple of stations noted the possibility that they could possibly hear multiple birds calling from around the same direction.
- Note: we only count birds that are detected by at least 2 monitoring stations.
- This is our second highest number of birds recorded since at least 2010.
- Thanks to AGL who helped to pay for the breakfast.
Summary of results for the last 8 years.
Volunteer help is needed again on the first of our hands on work days for 2017. Environmental weeds are a menace and without extra help from passionate people they can quickly degrade precious habitats. On Saturday March 18th we will be continuing our ongoing efforts to keep Tutsan, Sycamore Maple, Blackberries and Ivy under control at a vulnerable site in the picturesque Tarra Valley.
No experience or prior knowledge necessary (help with weed id provided).
Meet at the Tarra Valley Picnic Area Car Park at 9.30am (finish at 12.30pm)
Tools provided (but you might like to bring along your own gloves.
For further details or to let us know you intend to come along contact us at email@example.com or phone David on 0488 035 314.
In the pre-dawn darkness on Saturday the 18th of June, twenty-five volunteers and one Park Ranger were greeted with perfectly calm conditions for Tarra-Bulga National Park’s Annual Lyrebird Survey. Overnight showers had passed by leaving moist dripping foliage in their wake.
The survey is designed to monitor the density of Lyrebirds living in 60ha comprising of wet sclerophyll and cool temperate rainforest immediately to the east of the Tarra-Bulga National Park Visitors Centre. There are sixteen monitoring points strategically placed throughout the site and volunteers move to each site before adult male Lyrebirds start their morning calls at dawn. Volunteers then use a compass to record the direction and proximity of the Lyrebird calls. This year we had enough volunteers to cover all but one of the monitoring points.
Following the survey, lines representing the direction of the calls are plotted onto a map, and triangulation is used to establish the spots where birds were calling from. This year the results indicate we had at least nine (male) Lyrebirds calling in our 60ha zone. This corresponds to a density of one adult male Lyrebird per 6.7 ha. You can also assume that there will be female lyrebirds and immature males or non-calling males within our target area. To account for this to get our overall population of Lyrebirds we multiply the number of calling males by a factor of 2.5. It is believed that male Lyrebirds do not begin to breed until they are around 6 or 7 years old.
Summary of Tarra-Bulga National Park Lyrebird Surveys