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Jennifer Marohasy

Jennifer Marohasy

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The Ogre-faced or Net-casting Spider

October 10, 2007 By neil

Dienopsis subrufa.jpg

Introducing another inhabitant of the Daintree rainforest, the Ogre-faced or Net-casting Spider Deinopsis subrufa is cryptically discrete in shades of brown and grey, but once detected is recognizable by its enormous posterior median eyes and 40mm long body.

According to a website examining eyes, female net-casting spiders of Australia have the largest eyes of any spider. They also have an amazing ability to capture photons (particles of light), as many as 2000 times the number absorbed by human eyes.

Perhaps their most distinguishing feature is the peculiar deployment of silk to capture prey. Using comb-like structures on the tibia of their hind legs, they construct a rectangular net from a woolen-looking, bluish-tinted silk with a 400 to 600% stretch capacity. They hold the corners of this highly elasticised net with their four front legs and then wait for prey. When prey is detected, the spider propels itself forward with blistering speed, stretching the net over and around the prey. Once captured, the prey is then secured further with silk fed from the spider’s spinnerets with the hind legs.

Spiders concern participants on nocturnal tours in the Daintree more than any other creature. Some people are completely immobilised by their fear of these fascinating animals. This is not the case with renowned artist Louise Bourgeois, who has created a nine-metre high spider as an ode to her mother, which now resides on the banks of the River Thames overlooking central London.

Filed Under: Uncategorized Tagged With: Plants and Animals

Cycad Relations Run Hot and Cold

October 6, 2007 By neil

B.spectabilis.jpg

Cycads have an evolutionary history dating back to the dry, cool age of the Triassic, when much of the world’s terrestrial landscape was inhospitable to spore-producing plants. They have carried the evolutionary breakthrough of the seed from an ancient group of now-extinct plants called Bennettitaleans, to the present.

Cycads are pollinated mainly by weevils and thrips, which carry out much of their life cycle within the tissues of the male and female cones. In what could be considered an insightful adaptation to global warming (albeit at a micro-level), an ABC Science Online article by Stephen Pincock reveals how another species of cycad Macrozamia lucida uses a stockpile of sugars, starch and fats to heat their cones to around 12 degrees Celsius above air temperature to encourage thrips to evacuate to the more appealing climes of the female cones.

Whilst cycads are pollinated by weevils and thrips, the distribution of their seeds is reliant upon another group of animal carriers.

Lepidozamia hopeii.jpg

The world’s tallest cycad Lepidozamia hopeii can reach twenty-metres. Every five-years-or-so, female plants produce large cones that mature over about ten months. They then collapse and bright-red seeds adorn the forest floor at the base of the plant. Mammals carry individual seeds away from the intensity of competition and remove the delectable red aril from the seed, leaving the camouflaged core to recruit away from the competitive disinterests of the parent plant.

Filed Under: Uncategorized Tagged With: Plants and Animals

Unidentified (Spider)?

October 6, 2007 By neil

UnknownSpider.jpg

I was just out photographing cycad cones for a new entry, when I happened upon this bizarre creature. It would appear to have eight legs, with the forelegs raised completely over the animal, presumably in an expression of defense. The noodle-like embellishments on the ventral surface of these legs (at least) appear to add a degree of emphasis to the expression.

Tucked under the bulk of the animal, between the short leg in the foreground (pointing towards the bottom left corner of the image) and the bulbous mass aligned with the central vein of the leaf, is another appendage that looks suspiciously like a palp. This would imply that the head of the animal is most proximal to the top left corner of the image and that the rear legs have been hyper-extended up and over the animal’s back.

The total length of the animal, legs excluded, is less than 4 mm.

Any ideas?

Filed Under: Uncategorized Tagged With: Plants and Animals

Tourism Marketing in a Warming World

October 5, 2007 By neil

People all over the world have become conscious of the need to preserve the resources of the planet and become more efficient in their use of energy to reduce the impacts of global warming.

So says the Planet Safe Partnership website, developed for the regional tourism office Tourism Tropical North Queensland.

Such is the economic importance of tourism to TNQ, that its regional tourism office has identified a need to adjust its marketing strategies to mitigate the adverse impacts of the global warming phenomenon on travel patterns.

Key criteria for partnership within this initiative requires an energy audit to be undertaken through an Australian Government accreditation program; a commitment must be made to reduce the carbon footprint to Australian Government targets (as a minimum); and commitment to environmentally-friendly operational practices (as new technologies and equipment comes online).

The consequences of non-involvement are exclusion from a government-sponsored marketing partnership.

I wonder if Tourism Tropical North Queensland considered the failings of previous accreditation schemes before embarking this latest scheme? The National Ecotourism Accreditation Program was supposed to do what this lower-level initiative aims for. Likewise GreenGlobe21.

Tourism and Travel is apparently the world’s largest industry and on that basis it should be encouraged to optimise its benefits and minimise its adverse impacts. Should any community in the world be expected to suffer the intrusion of tourism if it is no better off?

Hackneyed overtures such as taking only photographs and leaving only footprints, need to be expunged for their failure to ensure that it is appropriate for photographs to be taken and that meaningful economic contributions are left to ensure the conservation of the environment and the improvement in the well-being of the local people.

At its most fundamental, it would be appropriate that any accreditation scheme that aims to encourage travel ethics is in itself incorruptible.

Filed Under: Uncategorized

The Differential Value of Heritage

October 4, 2007 By neil

Natural and cultural heritage has differential value; what is priceless and irreplaceable to some is disposable to others. This differentiation is cause for many conflicts and manifests anywhere from highly localised disputes to the very core of sovereign sensitivity.

In an ABC News article Vandal attack on treasured cave, heavy cutting equipment was allegedly used to break into the Kubla Khan cave, regarded as one of Australia’s most pristine underground formations. Within the cave is a huge chamber called Xanadu, containing an 18m high stalagmite known as the Khan. The cave is not open to the general public and permits are restricted to only 12 tour groups each year.

Exclusivity of access to public reserves is contentious. The relationship between the permit-issuing authority and the permit holder is exclusionary to fair trade. Inhabitants local to the area may well perceive their exclusion from their cultural heritage as usurpatory, especially if permit-holders derive income privilege from restricted entry.

When I read the article I was reminded of the seemingly senseless destruction of the Dig Tree, made famous through the ill-fated 1860 Burke & Wills expedition. I must confess that when I heard of this incident of alleged vandalism, Innaminka sprang to mind and the beauty of the approach through the Strezlecki Desert. Nevertheless, there are those amongst us, thankfully small in number, who deliberately damage or destroy heritage as an expression of will.

I have previously written about the Disposal of Our Heritage, but much of my concern reflects the likelihood of collateral damage inflicted against the state and its Parks and Wildlife Service in particular.

It is very frustrating that the environmental mandates and functions of government land management agencies are not considered business activites, as they are relieved of the need to conform with competitive neutrality and fair trade. A national overhaul of environmental compliance is urgently required to protect our heritage from these aggravating practices. Our greatest defense, in the meantime, is the residential vigilance of local people and the importance of protecting that which sustains them, now and hopefully into the future.

Filed Under: Uncategorized Tagged With: Philosophy

Orange-thighed Tree Frogs

October 4, 2007 By neil

Xanthomera.jpg

Confined to tropical Northern Queensland rainforests, between Cooktown and Townsville, Orange-thighed Tree Frogs (Litoria xanthomera) live in the upper-canopy and descend to the ground only to breed. Emerging only after heavy rains, these beautiful tree frogs can be conveniently observed only four or five nights of the year.

Courting rituals are very noisy and may be heard for hundreds of metres through dense rainforest. Only males vocalize and it would seem to be the smaller males that out-compete for the affections of the females through their higher frequency, more energy-efficient and sustained serenading.

Filed Under: Frogs, Nature Photographs Tagged With: Plants and Animals

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Jennifer Marohasy Jennifer Marohasy BSc PhD has worked in industry and government. She is currently researching a novel technique for long-range weather forecasting funded by the B. Macfie Family Foundation. Read more

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