Blue sea slugs are biological control of the stinging bluebottle

February 4, 2012 by · 1 Comment
Filed under: Beaches 
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Everyday Bluebottle Predators

I have always wondered what on earth eats the bluebottles that wash up onto our beaches during the summers. The bluebottles can give a very painful sting and can leave large welts on your skin. Bluebottles, or Pacific Man o’ War float on the surface of the ocean and move around with ocean currents and the wind. Bluebottles are ecologically known as plankton because they are organisms that drift on the surface of the ocean, without having any formal means of locomotion to move themselves. Bluebottles eat small planktonic organisms that come into contact with their stinging tentacles that hang into the water.

Bluebottle on sand at MacMasters Beach

Bluebottle washed up on MacMasters Beach (Physalia utriculus)

The damage from the bluebottle sting

Skin welts caused by a bluebottle sting, courtesy Travelling.Steve, flickr

Killcare beach views - Marine Stingers sign

Bluebottle warning sign at Killcare Beach, courtesy Tim Gillin, flickr

Another type of floating organism that commonly washes up on our beaches is the  By-the-wind-sailor which has the special name of Velella velella. This animal is related to the bluebottles in that it also has stingers that capture small plantonic organisms, but this animal is not known to sting people.

By-the-wind Sailor on sand at MacMasters Beach

By the wind sailor washed up on MacMasters Beach

All animals have predators, and the By-the-wind sailors and Bluebottles that wash up on most east coast Australian Beaches are no exception. Recently at MacMasters Beach two really interesting animals washed up which are the natural predators of bluebottles, both are molluscs, one a snail, the other a sea slug or nudibranch. The common purple snail, has a “bubble raft” that enables the snail to float on the surface of the ocean and it is a predator of both the bluebottle and the By-the-wind sailor’s.

Common Purple Snail with bubble raft, courtesy wikipedia

The predator I find really interesting is the Blue Sea Slug, (Glaucus atlanticus), which is a predator not just of the bluebottle and the By-the-wing sailor, but also the Common Purple Snail. I collected a couple of these sea slugs, photographed and videoed them and then released them back into the water. Apparently these creatures travel upside down when floating, the stripy side is in fact the underside and the top is silver in colour. They eat the body of the bluebottles, and the stinging cells in the tentacles get stored in the slugs body and acts as a protection against predators.

Blue Sea Slug - Glaucus atlanticus

Blue Sea Slug from MacMasters Beach, it is about 20mm long

A little more information:

Common Purple Snail

By-the-wind Sailor

Bluebottles

Blue Sea Slug

Stealing Waratahs – enough to give you the blues

September 5, 2010 by · Leave a Comment
Filed under: Australian Plants 
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Stop the Wildflower – Waratah Theft

Waratahs (Telopea speciossisma) are in full flower at the moment and some of the best wildflower displays you can see are within Brisbane Water National Park around the Warrah Trig area on the NSW Central Coast, just north of Sydney.

waratah head portrait2

Waratah Flower in full bloom at Warrah Trig, Brisbane Water National Park

Unfortunately, Waratah blooms are being poached from the bush and Cathy Offord from the Royal Botanic gardens, Mt Annan and I  conducted a study on efforts to reduce Waratah poaching by painting some of the flowers with blue paint. The study revealed that although the painting did reduce the rate of theft a little, there was not a real difference between the rate of theft between painted and unpainted flowers.

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Waratah painted with blue paint which we hoped would reduce the theft of the blooms

Full details of the study is now published in Cunninghamia the ecological journal of the Royal Botanic Gardens, Sydney, and Tim Entwisle has also an online article.

The compost heap bird – Australian Brush-turkey

July 3, 2010 by · 1 Comment
Filed under: Australian Birds 
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A Compost heap as big as a small car? Don’t be mistaken, this is size of the incubator for the eggs of the Australian Brush-turkey (Alectura lathami).

Australian Brush-turkey (Alectura lathami)

An Australian Bursh-turkey courtesy of kookr on Flickr

Brush-turkeys have been nesting in my backyard for several years now, and around the winter solstice the males begin to make their mound, or begin to remodel an existing mound in preparation to attract a female to mate with. The nests are built on the ground and are mounds built from leaves, sticks and practically anything loose on the ground including plastic bags, and rubbish. The mounds are commonly 4 meters across and 1metre high, although I have seen mounds that are nearly 2 meters high and 6 meters across. If a cubic metre of leaf mulch and stick weighs about 40kg, then a brush-turkey mound must weigh at least 640kg which is an impressive size for a birds nest!

Australian Brush-turkeys

Male and Female brush-turkey on a mound, the female is laying her egg in a hole dug by the male.

The female brush-turkeys lay their eggs inside the mound within a hole created by the male. Once the egg is laid, the male covers the egg with leaf litter and tends the mound. Instead of sitting on the eggs ans most birds do, the male brush-turkey incubates the eggs by adding or removing vegetation from the mound. The mound is like a giant compost heap in the sense that the vegetation in the mound begins to rot through microbial decomposition and begins to generate heat through the decompositional process. The male can adjust the heat of the mound by removing vegetation, thereby cooling the mound, or by adding vegetation to the mound which increases microbial activity and hence heats the mound. I’ve noticed that brush-turkeys are continually adjusting the amount of vegetation depending on whether the mound is exposed to sunlight and or moisture from rainfall.

The male brush-turkey uses his beak to determine the temperature of the mound, he sticks his head into the mound, hence the lack of feathers on his head. He can adjust the temperature of the mound to between 33-38 degrees Celsius. The brush-turkey eggs are quite large (12% of the females body weight) have a very high yolk content (67%), which allows the chick to be very well developed when it hatches after around 50 days in the mound.

Australian Brush-turkey chick

A young Brush-turkey chick not long out of the mound, courtesy of John Asquith

Chicks fall prey to cats, foxes, dogs, birds of prey and goannas. Goannas also dig into the mounds to eat the eggs. At around 3 weeks of age the chicks turn from brown to black and develop their adult plumages and males can begin to build mounds at 8 months of age. Chicks have to fend for themselves without any help from the parents when they dig themselves out of the mound and very quickly they can fly to avoid predators as they emerge from the mound with fully developed wing feathers.

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A roosting brush-turkey high in a tree. Courtesy of flagondry, flickr.

Brush-turkeys roost at night high in trees and roost communally and I have seen up to 20 birds in a single spotted-gum tree at Hardy’s Bay. Birds can travel large distances to roost and can make their way to the tops of trees which is quite a sight for such a large bird which spends most of its time on the ground.

Nothing worse than a drowned bandicoot in your pool

April 27, 2010 by · 27 Comments
Filed under: Australian Mammals 
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An unwelcome surprise in your pool – a drowned native marsupial

Ever gone outside in the morning to admire your pool and found that there is something dead floating in the water? Unfortunately, lots of native wildlife drown each year in backyard swimming pools, not because they cannot swim, it is because they cannot get out and swim until they are exhausted and then drown.

Doug Beckers with drowned juvenile Northern Brown Bandicoot

Doug Beckers with a drowned juvenile long-nosed bandicoot

Northern Brown Bandicoot

A juvenile long-nosed bandicoot that drowned in a backyard swimming pool

I have heard stories of adult northern-brown bandicoots, long-nosed bandicoots, snakes falling into swimming pools and koalas fall into backyard swimming pools on the NSW coast and will drown in pools if they cannot get out.

Why can’t they get out?

Well most Australian wildlife can swim very well -check out the koala video below Read more

Purple, Red, Yellow, Jacarandas, Illawarra Flames and Silky Oaks

November 8, 2009 by · 4 Comments
Filed under: Australian Plants 
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In November, the urban areas of Australia become a blaze of colour with the yellow of Silky Oaks, purple of Jacaranda’s and the Red of Illawarra Flame Trees.

purple-yellow-red
Silky Oak, Jacaranda and Flame Trees

The flowering of these trees also marks the end of year exam time for schools and technical colleges and I remember when I was studying Horticulture in Sydney, I used to have lunch at the top of a hill overlooking Sydney and I remember vividly Read more

New Holland Mouse and House Mouse

July 30, 2009 by · 5 Comments
Filed under: Australian Mammals, Fire 
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New Holland Mouse (Pseudomys novaehollandiae) vs House Mouse in an area recovering from wildfire

In June 2009 we did some small mammal trapping at Lake Munmorah State Conservation Area and we trapped within several areas of Wallum heath, a plant community dominated by Wallum Banksia (Banksia aemula).

Wallum Heath

Wallum heath in Munmorah State Conservation Area, pre-fire.

One of the areas of the Wallum heath was burnt in a wildfire in February this year and I suspected that we would find the Read more

Hover and Heli-winching

July 19, 2009 by · 1 Comment
Filed under: Fire 
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Helicopter safe usage in firefighting situations

Helicopters are an extremely valuable resource for firefighting within remote areas of bushland. We regularly train to use helicopters safely, for without safe use helicopters can be very unforgiving. We trained this week with “Park Air 3” one of the NSW National Parks and Wildlife Service (NPWS) Squirrel helicopters. What an excellent machine!

Park Air 3

Park Air 3, National Parks and Wildlife Service NSW Squirrel helicopter

Training using these helicopters involves 3 main courses for the general remote NPWS firefighter; Click here to read more….

BAER Team – Victorian Fires 2009 – Wildlife and Fauna Assessment

July 11, 2009 by · Leave a Comment
Filed under: Australian Mammals, Fire 
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Wildlife and Fauna Assessment – Kilmore Murrindindi Fire – Victoria Fires 2009

Assessing the actions that are critical to the recovery of the animals affected by the Kilmore-Murrindindi Fire was one of the first tasks of the BAER fauna team. The fauna team comprised of Doug Beckers Biodiversity Officer NSW National Parks and Wildlife Service, Lisa Jameson – Fauna Specialist (US Fish and Wildlife Service), Peter Menkhorst – Victorian Fauna Specialist, Ken Griggs- Fauna Specialist (US Fish and Wildlife Service) and Steve Smith – local Flora and fauna expert, Department of Sustainabililty and the Environment.

Murrindindi - Doug Beckers - Lisa Jameson - Peter Menkhorst - Ken Griggs

Doug Beckers, Lisa Jameson, Peter Menkhorst and Ken Griggs, BAER Fauna Team

Assessing the critical impacts on Fauna and Wildlife is a huge task Read more

BAER Team – Victorian Fires 2009 – The Task and Team

June 7, 2009 by · Leave a Comment
Filed under: Fire 
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Doug Beckers and the 2009 Victorian Bushfire Emergency BAER Team

During February-March 2009, I was privileged enough to be able to contribute to the Victorian Bushfire emergency as a member of the BEAR Team evaluating bushfire recovery and rehabilitation as part of the Emergency management Team at Alexandra in central Victoria.

BAER Team logo Victoria 2009

What is the BAER Team?

The BAER Team is the Burned Area Emergency Response team. The team is made up of specialists from various disciplines in emergency fire management and recovery and the team is part of the Department of the Interior of the United States Government.

The 2009 BAER team was invited by the Victorian Government to assist with the evaluation of the impacts of the huge wildfires that occurred in Victoria in February and March 2009. Two BAER teams assisted in Victoria and I worked with the team on the Kilmore East-Murrindindi fires based in Alexandra.

What an incredible experience it was working at Alexandra, seeing all the fire devastation and talking with locals about their experiences in the fires. Something I will never forget and has made a lasting impression on my perception of community and fire management.

The Kilmore-Murrindindi BAER Team

BAER Team - Kilmore-Murrindindi Fires 2009

2009 Kilmore-Murrindindi BAER Team. 2009 BAER Team - Victoria Australia. Back row left-right, Margaret Kitchin, John Costenaro, Nora Caplette, Erv Gasser, Gavin Lovell. Front row, left-right, Fred Von Bonin, Lisa Jameson, Chuck James, Judy Hallisey, William (Bill) Sims, Mike Dolan, Richard Easterbrook, Ken Griggs, Richard Pyzik, Doug Beckers

Team members:

Read more

Somersby Mintbush and Fire

May 30, 2009 by · Leave a Comment
Filed under: Australian Plants 
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Somersby Mintbush recovers from fire by producing seedlings.

I was involved with the burning of a patch of bush at Somersby on the Central Coast of New South Wales which contains some of the Endangered plant Somersby Mintbush (Prostanthera junonis).

Checking out the Somersby Mintbush before the fire

Checking out the Somersby Mintbush before the fire

We monitored the effect of the burn on the plants Read more

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