Here in New Zealand, we have many native species of birds, insects, frogs, lizards and the like that thrived when our islands were cut off from the rest of the planet, but that have become extinct, or are in imminent danger of being so due to introduced predators such as rats, stoats, hedgehogs, ferrets, cats etc. etc.
It leads to the bizarre situation that conservation here is largely about killing things.
Let's say the tree lobster on Lord Howe is replaced by rats and cats. Then Lord Howe lost one specie and gained 2, for a net gain of one specie. So local biodiversity increased. The planet lost one specie, so global biodiversity decreased.
You think the rats won't continue to displace other species? And what happens to the rats when there's nothing left to displace? And then what happens to the cats?
I lived in Wellington for about three years. NZ is truly one of the most beautiful places in the world. It is sad how many of the birds are threatened or endangered because of invasive species. NZ customs is pretty diligent about preventing harmful things from coming into the country thankfully.
I still have a bit of sadness when I get to NZ and remember we humans killed all the Moas very early after landing there, would be so interesting to see one alive.
Rats are terrible all right, though stoats are worse. There has been some success with new locally developed trap technologies. These ones use a CO2 cylinder to strike the rats or stoats, then reset themselves automatically. http://www.scoop.co.nz/stories/BU1402/S00802/unprecedented-0.... Much better if you're a city boy who doesn't really like dealing with traps and dead animals too much.
We use a bigger version to catch possums. Its hard to tell how many we catch though, as the feral pigs like to carry off and eat the dead ones. Its really a fascinating logistical problem trying to eradicate a broad spectrum of pests.
That's basically what rats do. I've got pet rats and they're cute and intelligent, but they're rodents optimized for breeding. That can breed so fast it isn't even funny and they destroy everything with their teeth to either eat it or build nests from the bits and pieces or just to test it out with their teeth.
Rats are crazy awesome. They're not mice or hamsters or gerbils. They are so much more intelligent and can have a personality. And I'm convinced that hamster personality is a scale of how likely it is to bite you
That being said, wild rats are very destructive because of their hardiness and intelligence. Raccoons may be the top animal for intelligence in urban environments, but they can't match rats for their destructive potential.
Many predators live in balance with the population of their preys. When the predators are too successful, the prey population will diminish, which causes the predator population to shrink, which is good for the preys, etc.
But omnivores like rats can wipe out an entire prey population and then just switch to some other source of food.
Rats devastate island populations in particular because those populations aren't evolved to deal with them. Relatively remote islands create a sort of pocket ecosystem where new organisms can't easily arrive from outside, so all the resident species evolve to deal with only the local threats and to fit snugly into their niche. But rats are the end product of a ongoing continent-wide evolutionary battle; they're flexible, they're great at dealing with new situations, and the locals aren't.
In New Zealand, isn't there also a huge insect called the Weta? I've never been to your beautiful homeland, but I've heard tales. I wonder what exactly differentiates these "tree lobsters" from Weta.
Camel crickets can go directly to hell. They loved our basement when my family was living in Virginia and just about gave me a heart attack every time I went down there.
Love your country when I was there 2yrs ago but must admit I thought the policies to inventory everything at the airport (I've never had my shoes checked for soil/mud before) was a losing proposition. It struck me that the prevailing thought was that NZ was so fragile that anything foreign could tip the scales and cause catastrophic consequences (eg. for those old enough to remember the Boy in a Plastic Bubble). Which might happen but life evolves... (which also happens)
Did you read the article? Yes, ecosystems can be fragile. New Zealand has (rightfully) decided to protect theirs, even if it means a slight inconvenience at the airport.
Of course they have a right to do whatever, but I'm just saying it seems like a losing strategy. Bugs and Birds get blown off course, rats sneak on ships, etc. all the time. Just saying it seems like an impossible task to police this...
Certainly an immensely challenging task, but hopefully not impossible. We have hardly begun to apply new technology to the problem - drones, new lures, mesh networks, low cost cameras.
Also we've stopped those pesky Victorians from introducing new species. Its a good thing they never introduced wildcats to control the stoats, weasels and ferrets - which they introduced to control the rabbits - which they introduced to give them something to shoot at on quiet Sunday afternnons.
Reminds me of a Radiolab episode[1] about a similar effort to bring back a specific species of tortoise in the Galapagos islands. The offending infringing species there where goats. What was really interesting was the method used for the eradication program.[2]
The old accepted view was that terrestrial arthropods are limited in size by their system of respiration which amounts to exoskeletal pores (spiracles) and internal airways. So terrestrial bugs can't get much bigger because of the body volume (cubic) versus passive respiratory surface (square). (we've got a forced air/blood circulation system so we can get bigger) Consequently it would be fascinating to learn how close Dryococelus australis is to that theoretical limit, or has it developed some sort of active respiratory system? (in which case, maybe it's time to start engineering insect saddles?)
Are they ever going to go back to the island and collect more specimens for breeding (and perhaps release some captive-bread individuals to replace them)? Even though that population was probably extremely inbred there's probably still some genetic diversity there that wasn't represented in to two wild specimens they managed to breed.
Having such a genetically homogeneous population would make me nervous about disease potentially wiping them all out. Hopefully they can keep many breeding pairs in multiple locations around the world to prevent this.
As a counterpoint to your claim that being a food source for humans guarantees survival, the orange roughy is a good example. It is a fish that was discovered as tasty and then fished to 10% of its original numbers within 50 years.
True, but I didn't think that we should go to Ball's Pyramid and eat them up. I was thinking about mass production. Think about chicken: there are more chickens than humans on this planet [1].
These creatures have such a great name! Nobody wants to eat crickets or worms, but who could resist a tree lobster? It is such a great marketing name!
I'm a southern Louisiana (US "Deep South") native. Here, and in other areas of the south (and elsewhere in the world), we have similarly large "cicadas", which are basically giant crickets. They hatch once every 13 years (shorter than most other cicadas, which hatch every 17 years) [1]. Though the hatches produce huge numbers (sometimes causing areas of road to be literally covered and obscured), and can sometimes be a nuisance because of their sound, they play a very integral role in the ecological cycle and contribute to a very diverse system of plants and animals which many people around here take great pride in. I hope that the residents of Lord Howe Island can learn to live with some new friends.
Those aren't limited to the deep south. We have several broods here in VA. As a kid, those big brood years were always amazing - so many bugs crawling around, and their shells littering the roads for weeks. Amazing stuff.
Chocolate covered cicadas, cicada pizza, fried cicadas. The mind reels at the thought, but they're generally not bad at all.
When the last giant bloom came to the southern Ohio area (~2000 or so), there were people using snow shovels to the clear the sidewalks of the carcasses. There was one particular neighborhood where the sound was so deafening, you couldn't hear the person next to you, even if they were shouting.
It looks like they just pushed some of the photos further forward in the text and corrected a small omission ("give it a man who was very familiar" to "give it to a man...").
There was a BBC article (about rebooting a species, inbreeding and recessive genes) mentioning Bells Pyramid last week. Perhaps that spurred the update?
You can use the wayback machine to get old versions and diff the two raw html files (little bit dirty, but it works). Only found changes in the wording of the "description" and "og:description" meta tags.
<meta name="description" content="The insect
is so large — as big as a human hand — it's been dubbed a "tree lobster." [-It was thought to be-]{+Presumed+} extinct,[-but-] some enterprising ento
mologists [-scoured-]{+found them on+} a barren hunk of rock in the middle of the [-ocean and found surviving Lord Howe Island stick insects."-]{+ocean."+} />
Edit: Is there a way to get the raw html from archive.org without the rewritten links? It pollutes the diff badly.
It's possible to successfully breed inbred insects like this, because eventually you can select out all the ones with recessive gene problems (you can get lots of generations quickly with insects). The big issue is that such a homogeneous population is much more susceptible to disease -- a virus or bacteria that can kill one can probably kill them all.
I remember this posted from a year ago. I remember reading it and being grossed out that it was a giant bug and not some sort of 6 legged bear. Why that guy would ever touch that thing is beyond me.
It's interesting how this story has a true purpose, to convince the residents of Lord Howe to allow the insects to be released on their land by the pressure of the article's readers. Ball's Pyramid itself is perhaps even more fascinating to me. It looks like a good place for a wizard to live...
Once humans spread and travel became commonplace, its inevitable that 'invasive species' should become a worldwide problem. It only has to happen once; you can't ever be careful enough to avoid that. And the most invasive species of all, which erases whole ecosystems and changes everything including the water, soil and weather, is of course, us.
The largest known living flying insect is a species of giant dobsonfly native to China. Wingspan 21cm.
The largest known flying insects from the fossil record were about the size of a crow. Meganisoptera are sometimes called griffinflies, with wingspans up to 71cm, length 43cm.
Personally I thought the detail about them forming pair bonds and cuddling was the most adorable thing I had ever heard about a bug. I'd save that species.
Here in New Zealand, we have many native species of birds, insects, frogs, lizards and the like that thrived when our islands were cut off from the rest of the planet, but that have become extinct, or are in imminent danger of being so due to introduced predators such as rats, stoats, hedgehogs, ferrets, cats etc. etc.
It leads to the bizarre situation that conservation here is largely about killing things.