Copy your neighbour
A There is no animal that symbolises rainforest diversity quite as
spectacularly as the tropical butterfly. Anyone lucky enough to see these creatures flitting between
patches of sunlight cannot fail to be impressed by the variety of their patterns. But why do they
display such colourful exuberance? Until recently, this was almost as pertinent a question as it had
been when the 19th-century naturalists, armed only with butterfly nets and insatiable curiosity, battle
through the rainforests. These early explorers soon realised that although some of the butterflies'
bright colours are there to attract a mate, others are warning signals. They send out a message to any
predators: "Keep off, we're poisonous." And because wearing certain patterns affords protection, other
species copy them. Biologists use the term "mimicry rings" for these clusters of impostors and their
evolutionary idol.
B But here's the conundrum. "Classical mimicry theory says that only a single
ring should be found in any one area," explains George Beccaloni of the Natural History Museum, London.
The idea is that in each locality there should be just the one pattern that best protects its wearers.
Predators would quickly learn to avoid it and eventually, all mimetic species in a region should
converge upon it. "The fact that this is patently not the case has been one of the major problems in
mimicry research," says Beccaloni. In pursuit of a solution to the mystery of mimetic exuberance,
Beccaloni set off for one of the mega centres for butterfly diversity, the point where the western edge
of the Amazon basin meets the foothills of the Andes in Ecuador. "It's exceptionally rich, but
comparatively well collected, so I pretty much knew what was there," says Beccaloni. The trick was to
work out how all the butterflies were organised and how this related to mimicry.
C Working at the Jatun Sach Biological Research Station on the banks of the
Rio Napo, Beccaloni focused his attention on a group of butterflies called ithomiines. These distant
relatives of Britain's Camberwell Beauty are abundant throughout Central and South America and the
Caribbean. They are famous for their bright colours, toxic bodies and complex mimetic relationships.
"They can comprise up to 85 per cent of the individuals in a mimicry ring and their patterns are
mimicked not just by butterflies, but by other insects as diverse as damselflies and true bugs," says
Philip DeVries of the Milwaukee Public Museum's Center for Biodiversity Studies.
D Even though all ithomiines are poisonous, it is in their interests to
evolve to look like one another because predators that learn to avoid one species will also avoid others
that resemble it. This is known as Müllerian mimicry. Mimicry rings may also contain insects that are
not toxic but gain protection by looking likes a model species that is: an adaptation called Batesian
mimicry. So strong is an experienced predator's avoidance response that even quite inept resemblance
gives some protection. "Often there will be a whole series of species that mimic, with varying degrees
of verisimilitude, a focal or model species," says John Turner from the University of Leeds. "The
results of these deceptions are some of the most exquisite examples of evolution known to science." In
addition to colour, many mimics copy behaviours and even the flight pattern of their model species.
E But why are there so many different mimicry rings? One idea is that species
flying at the same height in the forest canopy evolve to look like one another. "It had been suggested
since the 1970s that mimicry complexes were stratified by flight height," says DeVries. The idea is that
wing colour patterns are camouflaged against the different patterns of light and shadow at each level in
the canopy, providing the first line of defence against predators." But the light patterns and wing
patterns don't match very well," he says. And observations show that the insects do not shift in height
as the day progresses and the light patterns change. Worse still, according to DeVries, this theory
doesn't explain why the model species is flying at that particular height in the first place.
F "When I first went out to Ecuador, I didn't believe the flight height
hypothesis and set out to test it," says Beccaloni. "A few weeks with the collecting net convinced me
otherwise. They really flew that way." What he didn't accept, however, was the explanation about light
patterns. "I thought if this idea really is true, can I can work out why it could help explain why there
are so many different warning patterns in any not place. Then we might finally understand how they could
evolve in such a complex way." The job was complicated by the sheer diversity of species involved at
Jatun Sach. Not only were there 56 ithomiine butterfly species divided among eight mimicry rings, but
there were also 69 other insect species, including 34 day-flying moths and a damselfly, all in a
200-hectare study area. Like many entomologists before him, Beccaloni used a large bag-like net to
capture his prey. This allowed him to sample the 2.5 metres immediately above the forest floor. Unlike
many previous workers, he kept very precise notes on exactly where he caught his specimens.
G The attention to detail paid off. Beccaloni found that the mimicry rings
were flying at two quite separate altitudes. "Their use of the forest was quite distinctive," he
recalls. "For example, most members of the clear-winged mimicry ring would fly close to the forest
floor, while the majority of the 12 species in the tiger-winged ring fly high up." Each mimicry wing had
its own characteristic flight height.
H However, this being practice rather than theory, things were a bit fuzzy.
"They'd spend the majority of their time flying at a certain height. But they'd also spend a smaller
proportion of their time flying at other heights," Beccaloni admits. Species weren't stacked rigidly
like passenger jets waiting to land, but they did appear to have preferred airspace in the forest. So
far, so good, but he still hadn't explained what causes the various groups of ithomiines and their
chromatic consorts to fly in formations at these particular heights.
I Then Beccaloni had a bright idea. "I started looking at the distribution of
ithomiine larval food plants within the canopy," he says. "For each one, I'd record the height to which
the host plant grew and the height above the ground at which the eggs or larvae were found. Once I got
them back to the field station's lab, it was just a matter of keeping them alive until they pupated and
then hatched into adults which I could identify."
Tasmanian Tiger
A Although it was called tiger, it looked like a clog with black stripes on
its hack and it was the largest known carnivorous marsupial of modem times. Yet, despite its fame for
being one of the most fabled animals in the world, it is one of the least understood of Tasmania's
native animals. The scientific name for the Tasmanian tiger is Thylacine and it is believed that they
have become extinct in the 20th century.
B Fossils of thylacines dating from about almost 12 million years ago have
been dug up at various places in Victoria, South Australia and Western Australia. They were widespread
in Australia 7,000 years ago, but have probably been extinct on the continent for 2,000 years ago. This
is believed to be because of the introduction of dingoes around 8,000 years ago. Because of disease,
thylacine numbers may have been declining in Tasmania at the time of European settlement 200 years ago,
but the decline was certainly accelerated by the new arrivals. The last known Titsmanijin Tiger died in
I lobar! Zoo in 193fi and the animal is officially classified as extinct. Technically, this means that
it has not been officially sighted in the wild or captivity for 50 years. However, there are still
unsubstantiated sightings.
C Hans Naarding, whose study of animals had taken him around the world, was
conducting a survey of a species of endangered migratory bird. The hat he saw that night is now regarded
as the most credible sighting recorded of thylacine that many believe has been extinct for more than 70
years.
D "I had to work at night." Naarding takes up the story. "I was in the habit
of intermittently shining a spotlight around. The beam fell on an animal in front of the vehicle, less
than 10m away. Instead of risking movement by grabbing for a camera, I decided to register very
carefully what I was seeing. The animal was about the size of a small shepherd dog, a very healthy male
in prime condition. What set it apart from a dog, though, was a slightly sloping hindquarter, with a
fairly thick tail being a straight continuation of the backline of the animal. It had 12 distinct
stripes on its back, continuing onto its butt. I knew perfectly well what I was seeing. As soon as I
reached for the camera, it disappeared into the tea-tree undergrowth and scrub. Naarding's sighting of
the thylacine was the first credible evidence of its existence in 70 years.
E The director of Tasmania's National Parks at the time, Peter Morrow,
decided in his wisdom to keep Naarding's sighting of the thylacine secret for two years. When the news
finally broke, it was accompanied by pandemonium. "I was besieged by television crews, including four to
five from Japan, and others from the United Kingdom, Germany, New Zealand and South America," said
Naarding.
F Government and private search parties combed the region, but no further
sightings were made. The tiger, as always, had escaped to its lair, a place many insist exists only in
our imagination. But since then, the thylacine has staged something of a comeback, becoming part of
Australian mythology.
G There have been more than 4,000 claimed sightings of the beast since it
supposedly died out, and the average claims each year reported to authorities now number 150. Associate
professor of zoology at the University of Tasmania, Randolph Rose, has said he dreams of seeing a
thylacine. But Rose, who in his 35 years in Tasmanian academia has fielded countless reports of
thylacine sightings, is now convinced that his dream will go unfulfilled.
H "The consensus among conservationists is that usually; any animal with a
population base of less than 1,000 is headed for extinction within 60 years," says Rose. "Sixty years
ago, there was only one thylacine that we know of, and that was in Hobart Zoo," he says.
I Dr. David Pemberton, curator of zoology at the Tasmanian Museum and Art
Gallery, whose PhD thesis was on the thylacine, says that despite scientific thinking that 500 animals
are required to sustain a population, the Florida panther is down to a dozen or so animals and, while it
does have some inbreeding problems, is still ticking along. "I'll take a punt and say that, if we manage
to find a thylacine in the scrub, it means that there are 50-plus animals out there."
J After all, animals can be notoriously elusive. The strange fish is known as
the coelacanth' with its "proto-legs", was thought to have died out along with the dinosaurs 700 million
years ago until a specimen was dragged to the surface in a shark net off the south-east coast of South
Africa in 1938.
K Wildlife biologist Nick Mooney has the unenviable task of investigating all
"sightings" of the tiger totaling 4,000 since the mid-1980s, and averaging about 150 a year. It was
Mooney who was first consulted late last month about the authenticity of digital photographic images
purportedly taken by a German tourist while on a recent bushwalk in the state. On face value, Mooney
says, the account of the sighting, and the two photographs submitted as the proof amount to one of the
most convincing cases for the species' survival he has seen.
L And Mooney has seen it all – the mistakes, the hoaxes, the illusions and
the plausible accounts of sightings. Hoaxers aside, most people who report sightings end up believing
they have been a thylacine, and are themselves believable to the point they could pass a lie-detector
test, according to Mooney. Others, having tabled a creditable report, then become utterly obsessed like
the Tasmanian who has registered 99 thylacine sightings to date. Mooney has seen individuals bankrupted
by the obsession, and families destroyed. "It is a blind optimism that something is, rather than a
cynicism that something isn't," Mooney says. "If something crosses the road, it's not a case of 'I
wonder what that was?' Rather, it is a case of 'that's a thylacine! It is a bit like a gold prospector's
blind faith, 'it has got to be there'. Mooney has seen individuals bankrupted by the obsession, and
families destroyed. "It is a blind optimism that something is, rather than a cynicism that something
isn't," Mooney says. "If something crosses the road, it's not a case of 'I wonder what that was?'
Rather, it is a case of 'that's a thylacine! It is a bit like a gold prospector's blind faith, 'it has
got to be there'.
M However, Mooney treats all reports on face value. "I never try to embarrass
people or make fools of them. But the fact that I don't pack the car immediately they ring can often be
taken as ridicule. Obsessive characters get irate that someone in my position is not out there when they
think the thylacine is there."
N But Hans Naarding, whose sighting of a striped animal two decades ago was
the highlight of "a life of animal spotting", remains bemused by the time and money people waste on
tiger searches. He says resources would be better applied to save the Tasmanian devil, and helping
migratory bird populations that are declining as a result of shrinking wetlands across Australia.
O Could the thylacine still be out there? "Sure," Naarding says. But he also
says any discovery of surviving thylacines would be "rather pointless". "How do you save a species from
extinction? What could you do with it? If there are thylacines out there, they are better off right
where they are."
E-training
A E-learning is the unifying term to describe the fields of online learning,
web-based training, and technology-delivered instruction, which can be a great benefit to corporate
e-learning. IBM, for instance, claims that the institution of its e-training program, Basic Blue, whose
purpose is to train new managers, saved the company in the range of $200 million in 1999. Cutting the
travel expenses required to bring employees and instructors to a central classroom account for the
lion's share of the savings. With an online course, employees can learn from any Internet-connected PC,
anywhere in the world. Ernst and Young reduced training costs by 35 percent while improving consistency
and scalability.
B In addition to generally positive economic benefits, other advantages such
as convenience, standardized delivery, self-paced learning, and a variety of available content, have
made e-learning a high priority for many corporations. E-learning is widely believed to offer flexible
"any time, any place" learning. The claim for "any place" is valid in principle and is a great
development. Many people can engage with rich learning materials that simply were not possible in a
paper of broadcast distance learning era. For teaching specific information and skills, e-training holds
great promise. It can be especially effective at helping employees prepare for IT certification
programs. E-learning also seems to effectively address topics such as sexual harassment education',
safety training and management training – all areas where a clear set of objectives can be identified.
Ultimately, training experts recommend a "blended" approach that combines both online and in-person
training as the instruction requires. E-learning is not an end-all solution. But if it helps decrease
costs and windowless classrooms filled with snoring students, it definitely has its advantages.
C Much of the discussion about implementing e-learning has focused on the
technology, but as Driscoll and others have reminded us, e-learning is not just about the technology,
but also many human factors. As any capable manager knows, teaching employees new skills is critical to
a smoothly run business. Having said that, however, the traditional route of classroom instruction runs
the risk of being expensive, slow and, oftentimes, ineffective. Perhaps the classroom's greatest
disadvantage is the fact that it takes employees out of their jobs. Every minute an employee is sitting
in a classroom training session is a minute they're not out on the floor working. It now looks as if
there is a way to circumvent these traditional training drawbacks. E-training promises more effective
teaching techniques by integrating audio, video, animation, text and interactive materials with the
intent of teaching each student at his or her own pace. In addition to higher performance results, there
are other immediate benefits to students such as increased time on task, higher levels of motivation,
and reduced test anxiety for many learners.
D On the other hand, nobody said E-training technology would be cheap.
E-training service providers, on the average, charge from $10,000 to $60,000 to develop one hour of
online instruction. This price varies depending on the complexity of the training topic and the media
used. HTML pages are a little cheaper to develop while streaming-video presentations or flash animations
cost more. Course content is just the starting place for the cost. A complete e-learning solution also
includes the technology platform (the computers, applications and network connections that are used to
deliver the courses). This technology platform, known as a learning management system (LMS), can either
be installed onsite or outsourced. Add to that cost the necessary investments in network bandwidth to
deliver multimedia courses, and you're left holding one heck of a bill. For the LMS infrastructure and a
dozen or so online courses, costs can top $500,000 in the first year. These kinds of costs mean that
custom e-training is, for the time being, an option only for large organizations. For those companies
that have a large enough staff, the e-training concept pays for itself. Aware of this fact, large
companies are investing heavily in online training. Today, over half of the 400-plus courses that
Rockwell Collins offers are delivered instantly to its clients in an e-learning format, a change that
has reduced its annual training costs by 40%. Many other success stories exist.
E E-learning isn't expected to replace the classroom entirely. For one thing,
bandwidth limitations are still an issue in presenting multimedia over the Internet. Furthermore,
e-training isn't suited to every mode of instruction or topic. For instance, it's rather ineffective
imparting cultural values or building teams. If your company has a unique corporate culture is would be
difficult to convey that to first-time employees through a computer monitor. Group training sessions are
more ideal for these purposes. In addition, there is a perceived loss of research time because of the
work involved in developing and teaching online classes. Professor Wallin estimated that it required
between 500 and 1,000 person-hours, that is, Wallin-hours, to keep the course at the appropriate level
of currency and usefulness. (Distance learning instructors often need technical skills, no matter how
advanced the courseware system.) That amounts to between a quarter and half of a person-year. Finally,
teaching materials require computer literacy and access to equipment. Any e-Learning system involves
basic equipment and a minimum level of computer knowledge in order to perform the tasks required by the
system. A student that does not possess these skills, or have access to these tools, cannot succeed in
an e-Learning program.
F While few people debate the obvious advantages of e-learning, systematic
research is needed to confirm that learners are actually acquiring and using the skills that are being
taught online, and that e-learning is the best way to achieve the outcomes in a corporate environment.
Nowadays, a go-between style of Blended learning, which refers to a mixing of different learning
environments, is gaining popularity. It combines traditional face-to-face classroom methods with more
modern computer-mediated activities. According to its proponents, the strategy creates a more integrated
approach for both instructors and learners. Formerly, technology-based materials played a supporting
role in face-to-face instruction. Through a blended learning approach, technology will be more
important.