Showing posts with label biodiversity. Show all posts
Showing posts with label biodiversity. Show all posts

Saturday, October 24, 2015

'Tree of life' for 2.3 million species released



"A first draft of the "tree of life" for the roughly 2.3 million named species of animals, plants, fungi and microbes—from platypuses to puffballs—has been released.

"A collaborative effort among eleven institutions, the tree depicts the relationships among living things as they diverged from one another over time, tracing back to the beginning of life on Earth more than 3.5 billion years ago.

"Tens of thousands of smaller  have been published over the years for select branches of the tree of life—some containing upwards of 100,000 species—but this is the first time those results have been combined into a single tree that encompasses all of life. The end result is a digital resource that available free online for anyone to use or edit, much like a "Wikipedia" for evolutionary trees."
You don't need a complete census of species and complete tree with all the millions of species represented to get a pretty good idea of what the complete tree will  look like."



Read more at: http://phys.org/news/2015-09-tree-life-million-species.html#jCp

Monday, October 05, 2015

Improving Crop Yields to Respond to Global Warming and Population Growth


A couple of weeks ago there was an article in The Economist titled "Agricultural biodiversity: Banks for bean counters". I quote extensively from the article:
Climate change is expected to cause higher temperatures and more frequent droughts, changing the distribution of pests and diseases. Population growth will add to the pressure on productive land: the UN expects the number of people in the world to rise from 7.3 billion today to 9.7 billion by 2050. This, together with a switch to more meat-eating, will mean a big increase in the demand for food. The UN Food and Agriculture Organisation (FAO) says humanity will need 70% more food by then.
Dependence on a few staples worsens the consequences of any crop failure. Just 30 crops provide humans with 95% of the energy they get from food, and just five—rice, wheat, maize, millet and sorghum—provide 60%. A single variety of banana—Cavendish—accounts for 95% of exports. A fast-spreading pest or disease could see some widely eaten foodstuffs wiped out. 
That makes it even more important to preserve the genetic diversity found in crop wild relatives and traditional varieties as an insurance policy. Alas, much of it has already disappeared. The FAO estimates that 75% of the world’s crop diversity was lost between 1900 and 2000. As farming intensified, commercial growers favoured a few varieties of each species—those that were most productive and easiest to store and ship. 
According to Cary Fowler of the Global Crop Diversity Trust, an international organisation based in Germany, in the 1800s American farmers and gardeners grew 7,100 named varieties of apple. Today, at least 6,800 of them are no longer available, and a study in 2009 found that 11 accounted for more than 90% of those sold in America. Just one, “Red Delicious”, a variety with a thick skin that hides bruises, accounts for 37%. 
Meanwhile urbanisation, pollution, changing land use and invasive species are threatening the crop wild relatives that survive. A study in 2008 concluded that 16-22% of those related to peanuts, potatoes and cowpeas (a legume grown in semi-arid tropics) will have vanished by 2055 as a result of climate change.
So what if climate does change? Don't you just grow the same crops a few miles further from the equator? Well, what if the soils are different. What if there is not as much water in the new spot as the old one? What if you were on the western side of a hill, and the new spot is on the southern side, and the light conditions are different? What if there are different pests and diseases in the new spot? What if your machinery won't work as well in the new spot as it did in the old? I think that the world will need a lot of crop improvement to produce new varieties of major crops that will produce well under the new conditions.

One solution is pretty much out of the question. Most of the arable land is already in agricultural production. The world will no longer solve its food needs by putting unused arable land into production.

We could not do a lot be simply rationalizing our distribution and use of food. Obesity is harmful to the health of the obese as well as wasteful of food, and should be reduced globally.  Cows are a very wasteful way to produce protein as compared with legumes, and the fat intensive diet found in the USA not only uses a lot of land to feed cattle, a lot of grain to fatten them, but also results in poor health in people who have too much fat in their diet. It would be great if the world could rationalize protein production, getting those who eat too much animal protein to stop doing so, increasing the production of vegetable protein, and distributing protein more appropriately so that fewer people are protein starved and fewer people eat too much of the wrong kinds of protein.

Ultimately, we will have to have better varieties of food crops, and that means varieties with genes that better suit them to produce well in the places that they will be planted. Those genes can come from already domesticated plants, or from the much larger source in non-domesticated species. They can be transferred into new varieties of crops by mass transfers of genes as in traditional plant breeding, and then subjected to a long process of selection to weed out the genes that don't improve the variety. Alternatively they can be transferred by much more scientific and efficient processes of biotechnology. Society will choose. but I think I know the better way.

Sunday, August 30, 2015

Sunday, August 02, 2015

Birds of Paradise



The Birds-of-Paradise Project reveals the astounding beauty of 39 of the most exquisitely specialized animals on earth. After 8 years and 18 expeditions to New Guinea, Australia, and nearby islands, Cornell Lab scientist Ed Scholes and National Geographic photojournalist Tim Laman succeeded in capturing images of all 39 species in the bird-of-paradise family for the first time ever. This trailer gives a sense of their monumental undertaking and the spectacular footage that resulted. Filmed by Tim Laman, Ed Scholes, and Eric Liner. Also be on the lookout for the Cornell Lab's and National Geographic's gorgeous coffee-table book (http://amzn.to/RYb7IL), a major exhibit at the National Geographic Museum (http://ngmuseum.org/bop), a TV documentary (http://amzn.to/12jtkBL), articles in Living Bird (http://www.allaboutbirds.org/Page.asp...) and National Geographic magazines, and a North American lecture tour (http://bit.ly/VRD6eJ).

Thursday, May 29, 2014

The loss of biodiversity can not be reversed in a Homo sapiens timescale.


Different visualizations of species biodiversity.

 (A) The distributions of 9927 bird species. (B) The 4964 species with smaller than the median geographical range size. (C) The 1308 species assessed as threatened with a high risk of extinction by BirdLife International for the Red List of Threatened Species of the International Union for Conservation of Nature. (D) The 1080 threatened species with less than the median range size. (D) provides a strong geographical focus on where local conservation actions can have the greatest global impact. Additional biodiversity maps are available at www.biodiversitymapping.org.

Source: "The biodiversity of species and their rates of extinction, distribution, and protection"

Saturday, March 01, 2014

How Wolves Change Rivers




The reintroduction of wolves to Yellowstone has helped to restore the Yellowstone ecosystem towards its natural state, as the video shows. However, the wolves are under continuous threats due to political pressures against the protection of wolves. Apparently the politics in Wyoming and Montana are especially opposed to federal government efforts to protect national parks and especially sensitive to the fears of people owning sheep and cattle.

Tuesday, March 26, 2013

We have not identified most species




Very cool infographic from National Geographic - how many species have been identified, and how many do we think there are left to discover?

More info: http://bit.ly/UJ75oj

Friday, February 03, 2012

New biodiversity map of the Andes shows species in dire need of protection


The Cloud-forest Screech-owl
is endemic to the Andes
I quote from BioMed Central:
The Andes-Amazon basin of Peru and Bolivia is one of the most biologically rich and rapidly changing areas of the world. A new study published in BioMed Central’s open access journal BMC Ecology has used information collected over the last 100 years by explorers and from satellite images which reveals detailed patterns of species and ecosystems that occur only in this region. Worryingly, the study also finds that many of these unique species and ecosystems are lacking vital national level protection. 
The Andes provide many, many habitats from their eastern foothills in the Amazon forest to their western foothills rising from the Pacific Coast, to the very high mountains and mountain plateaus. Due to the rugged topography, many specific ecosystems are small and isolated from similar zones. I recall driving through areas of the Andes and passing through a small desert area with an arid microclimate and quickly finding another area with lush vegetation symbolic of generous precipitation. The result is exceptional biodiversity, but a biodiversity with many species present only in small numbers, and thus likely to become extinct with any disruption of their environment.

The reported study is of course very useful in identifying more fully the problem and could provide a useful tool in its solution.

However, I am very sorry to say that I fear a lot of this biodiversity will be lost. Poor people will seek to utilize the land to support themselves and their families and in so doing will destroy ecosystems vital to the survival of their species, and governments facing all sorts of other problems will be unwilling or unable to stop the process.

Monday, January 30, 2012

Annoying Illogic




The segment of 60 Minutes shared above shows how American wildlife ranchers are developing herds of endangered African species, providing a form of protection for the genetic heritage represented by those large mammals. Some of the ranches sell hunting rights. There appears to be a movement to prevent this from happening because people don't like the fact that animals are killed. Moreover, it appears likely that a law will be passed preventing ranchers from this kind of wildlife farming.

I no longer hunt, and I don't like killing animals for sport. However, I am willing to go along with the business if it serves to develop herds of endangered species in places where they can be scientifically maintained.

It is illogical to argue against hunting these animals in service of a greater good, while no one suggests that we should stop eating meat or stop using leather.

Sunday, August 15, 2010

Genomics Technology


Source: "Genomics: What Lies Within," The Economist, August 12, 2010.

I quote from the article on the hope for future hope for medical interventions taking patients genome into account through pharmacogenomics:

Pacific Biosciences, a Californian firm with a promising approach to whole-genome sequencing, is backed by such heavyweight investors as Blackstone Group and Kleiner, Perkins, Caufield & Byers. In a short time, it has raised more than $369m in financing. Complete Genomics, a local rival, has come up with a novel business model: it offers rapid sequencing as a centralised service, rather than selling sequencing machines. It filed to go public on July 30th.
In 2007 Knome charged $350,000 to sequence a human genome. Today it charges $40,000. Mr Conde predicts that by 2015 the price will have fallen below $1,000. Complete Genomics charges about $10,000 to sequence more than 90% of a genome. It too predicts that the cost will drop below $1,000 within five years.
One of the key results of the improving technology will be a great improvement in the efficiency with which scientists can study the genome of species. To date there have been some 180 species that have been sequenced. Even this has helped clarify the "tree of life" and evolutionary history. However, 1.4 million species have been described scientifically, and it is clear that there are many, many more species that have not been described; there are a lot of bugs out there, and probably a lot more microorganisms. One of my hopes is that advances in sequencing technology will eventually allow scientists to understand genome variability within species and between species. Such studies will probably show that many groups which we now think of as single species are in fact complexes of several similar species, as not too long ago bonobos and chimpanzees were thought to be the same species.

Eventually the Encyclopedia of Life may include links to DNA sequences for huge numbers of species and be the basis for a far better understanding of biodiversity. One hopes, in this International Year of Biodiversity, that we as a species will have found ways to protect biodiversity by that time. It would be a shame as well as a disaster to finally understand the diversity of life on this planet only after we had significantly diminished that diversity!

Sunday, October 26, 2008

The Wolves of Yellowstone

Image Source: "First Outing," Todd Fredericksen from a film by Bob Landis, Trailwood Films Wildlife Art Gallery

According to today's Washington Post, 13 years after wolves were reintroduced into Yellowston, the U.S. Fish and Wildlife Service took steps to remove the gray wolf of the northern Rockies from the Endangered Species List. "Environmentalists howled, calling it a last-gasp effort by the Bush administration to delist wolves."

The Post states that
for every 100 wolves at least six months of age, only 74 will live through the year, Bangs says. Of those that will not, 10 will be killed by government agencies because they attacked livestock. Another 10 will be killed illegally. Another three will die accidentally -- struck by a car, for example. And three will die from natural threats, including being killed by other wolves.
So how many wolves are there in the Rockies?
Last winter, Bangs says, there were 1,513 wolves in the northern Rockies. But the population has dropped this year, and there will probably be about 1,450 come winter......

Smith also suspects that there's an element of self-regulation of population. Yellowstone is now dense with wolves -- 171 of them spread among 11 packs. (The larger Yellowstone ecosystem has about 350 wolves.)

"At some point wolves control their own numbers through killing one another," Smith says.
I have read that there is good evidence that the wolves are a keystone species in the larger Yellowstone ecosystem, and that the predation of moose is resulting in changes in their grazing patterns that in turn is benefiting the plant communities. If they are a keystone species in Yellowstone, then I would guess they could be important in the larger ecosystem of the northern Rockies.

Comment: I can understand why the guys raising cattle and sheep want to eliminate wolf predation on their herds and flocks, but 1,500 is a very small population to maintain a species, and the northern Rockies is a very big space. The larger Yellowstone ecosystem, if it can support only 350 wolves is too small to protect the species.

I think this again is the Bush administration combining pseudo science, an ideological predisposition to distrust environmental regulations, and an unholy desire to pander to their (increasingly narrow) constituency that is pulling a fast one in the administration's dying days. This is worth a stand by all those interested in biodiversity, the protection of world heritage (The United States has had Yellowstone inscribed in the list of World Heritage sites maintained by UNESCO's World Heritage Center), the environment, and wolves specifically.

There must be a way to protect enough wolves to establish a sustainable population. The government could indemnify the owners of any calves or sheep killed by wolves. Laws could be more strongly enforced to prevent poaching. Research, if strongly supported over time, should provide means to keep the wolves within defined ranges and to reduce or prevent their predation on domestic animals. JAD

If we make the mistake of electing the McCain-Palin ticket, the wolves are probably in for a very hard time in the next administration. See my posting "Palin Versus the Wolves".

Tuesday, October 21, 2008

Destroying species by the millions and destroying the environment

Source: "Biodiversity: Fewer creatures great and small," The Economist, October 16th 2008.

I quote extensively:
Common birds are in decline across the world. Almost one in four species of mammals is in danger of extinction. If current trends continue until 2050, fisheries will be exhausted. As it is, deforestation costs the world more each year than the current financial crisis has cost in total, one economist argued.......

In 2002, under its auspices, they vowed to bring about “a significant reduction” in the rate of loss of biodiversity by 2010. The pledge became one of the Millennium Development Goals, the United Nations’ eight fondest ambitions for the world. Yet this target now looks unattainable.....

The IUCN also released a “comprehensive assessment” of the status of all known species of mammals. It found that 22% were threatened or extinct, and the well-being of a further 15% was unknown. For amphibians, the outlook is grimmer: a full 31% of them are at risk, and the status of a further 25% is uncertain. Sampling of species in other categories suggests similarly dire outlooks, with some 24% of reptiles and 32% of crabs thought to be threatened. For the most part, these findings do not reflect the latest data on global warming. But another IUCN study released at the congress found that 35% of the world’s birds, 52% of its amphibians and 71% of its warm-water corals were “particularly susceptible” to the threats from warming.

Last year, the Intergovernmental Panel on Climate Change, which is studying global warming for the UN, said 20-30% of species could die out if global average temperatures rise by more than 2°C or so. And even today’s rate of extinctions, one Barcelona delegate noted, is 1,000 times faster than the norm before man made a mess.

Comment: "The footsteps of civilization are written in shifting sands." Look at the photo of Mohenjo Daro in India, once one of the cradles of civilization and now a ruin in the desert. As Jared Diamond explained in his book, Collapse: How Societies Choose to Fail or Succeed, many civilizations in the past have failed when their economies and populations grew to the point that they could not survive an environmental downturn, leaving ruins in the midst of a degraded environment, the remnants of their populations either fleeing or living in much reduced circumstances.

In the past, civilizations only had the size and power to ruin a limited piece of the environment. Today our powerful, global society is seriously degrading the environment of the entire earth. Will we choose to fail or will we choose to take the necessary steps to protect the environment. One of the first and most important of those steps will be to stop the loss of biodiversity. JAD

Thursday, January 03, 2008

One-Third of Primate Species in Danger of Extinction


The 25 most endangered primates include 11 from Asia, seven from Africa, four from Madagascar and three from South and Central America. The list includes primates like the Sumatran orangutan of Indonesia and the Cross River gorilla of Cameroon and Nigeria as well as lesser known species such as the Greater bamboo lemur.

Almost a third of all apes, monkeys and other primates are in danger of going extinct because of rampant destruction of their tropical habitat, the commercial sale of bush meat and the trade in illegal wildlife. The remaining members of all of these species together would fit in a single football stadium.

Read the full story by Michael Casey in Sci-Tech Today of October 26, 2007.

Comment: This is simply not acceptable. Good neighbor policies should extend to protection of our nearest neighbor species against extinction. Besides, we have the most to learn about Homo sapiens from these species with which we share so much genetic history. JAD

Wednesday, August 08, 2007

Biodiversity is a Priority -- Two New Reports

"Lost forest reveals new species", BBC News, 8 August 2007.
An expedition to a remote forest in the Democratic Republic of Congo has uncovered six new animal species.

Conservationists discovered one new bat species, a new rodent and two new species each of shrews and frogs.

The region, which is in eastern DR Congo, near Lake Tanganyika, has been off limits to researchers since 1960 because of instability in the area.
"Rare river dolphin 'now extinct'" BBC News, 8 August 2007.
A freshwater dolphin found only in China is now "likely to be extinct", a team of scientists has concluded.

The researchers failed to spot any Yangtze river dolphins, also known as baijis, during an extensive six-week survey of the mammals' habitat.

The team, writing in Biology Letters journal, blamed unregulated fishing as the main reason behind their demise.

If confirmed, it would be the first extinction of a large vertebrate for over 50 years.

Comment: People are generally more interested
  • in animals than in plants,
  • in plants than in insects, and
  • in insects than in microbial organisms.
But the web of life on earth depends on all of these. Indeed if we look at potential benefits and threats to man, all of these kinds of organisms are important. Finding six species of animals in a brief survey of one place suggests how much more we have to do to understand biodiversity. The loss of a charismatic large vertebrate species illustrates how urgent is the need to gain such understanding. JAD

Sunday, July 22, 2007

Ethnobotany, Drug Development and IPR

I have just read Chapter 4, "Ethnobotany Blues" of Michael Brown's book, Who Owns Native Culture?. The book is interesting, and is telling me a lot I had not known about the interaction of intellectual property rights and the movement to protect the cultures of indigenous peoples. There is an accompanying website which is now serving as a clearinghouse for information about the struggles over control of these cultures.

Much of the chapter is about the International Cooperative Biodiversity Groups (ICBG) program that was started in early 1990's by the National Institutes of Health (NIH), the National Science Foundation (NSF), and the U.S. Agency for International Development (USAID). The program provided grant funding for such groups and is still continuing.

I was involved in the creation of the program from USAID, and want to take this opportunity to respond to the chapter. In general, I think Brown, an anthropologist, did a good job in the chapter and in the book as a whole, and in fact the chapter provided me information that I had not had because I lost contact with the program when I retired from USAID in 1996.

The ICBG did screen plant species for candidate chemicals for development of new pharmaceuticals. Each funded group included a partner capable of carrying out such screening, and this purpose was a justification for NIH's central role in its management. (The commercial firms participated on their own dime, and did not receive grant funds from the government.) Indeed, part of the justification for the program was that it took advantage of new screening techniques developed by industry that made the screening process more efficient that such processes had been in the past by allowing simultaneous screening for several kinds of activity. The public subsidy to the program as a whole was in part justified by the hope that there would be an emphasis on screening for drugs against the diseases of the poor in developing countries, which is of relatively little interest to commercial firms due to limited markets for such products.

The ICBG also did systematic botany (and one project I recall systematic studies of insect species), identifying species present in ecosystems and their distribution, and seeking to collect examples as well as to discover new species. This aspect was the interest of the NSF. Brown's two case studies (Peruvian Amazon and Chiapas Mexico) both involved the collection of plant species from under-collected areas, and their deposit in appropriate collections where they would be described and maintained. Indeed, one of the features that interested me in the science of the effort was the likely expansion of knowledge about the way evolution had distributed useful compounds across species.

The program focused on developing nations since that is where one will find more diverse plant species, and species less likely to have been studied in universities and corporate labs. We, the organizers and our consultants, of course understood that traditional uses of such plants by indigenous cultures for medical purposes could provide indications that the species involved would be chemically active. However, collection and screening was not to be limited to or even focused primarily on species used in traditional medical practice. We also assumed, correctly I still believe, that very large investments would be required to find any pharmaceutical of commercial value after appropriate leads had been developed through screening of plants.

USAID was interested in the program first to assure that funds were available to make it possible for scientists from the countries where the collections would be made to be fully involved and for those collections to be deposited in appropriate institutions in their home country. It was recognized that such involvement was imperative to leave added scientific capacity in the country, and that such investments were not likely to be made by industrial firms, nor by U.S. universities nor U.S. government domestic science agencies. USAID was also involved because of the belief that showing the potential economic value of the biodiverity in developing countries would encourage their conservation. The potential to develop new drugs against malaria and other tropical diseases was also an inducement.

The program sought to find innovative solutions to recognizing the moral rights of those from which collections were made to benefit from things found in those collections. We prepared the field by consulting experts, asked each group seeking a grant to make an appropriate arrangement and describe it in the grant proposal, and had those arrangements carefully reviewed in the proposal review process and incorporated in grant documents. Of course, we didn't know what we were doing, as this appeared to be breaking new ground. Unfortunately, Porter's chapter suggests we didn't do a good enough job in dealing with IPR, and that problems have arisen in some of the groups. On the other hand, his chapter suggests that ethnobotanists are better at dealing with IPR now than they were 15 years ago, and I hope that that is in part the result of the interest we created and the experience that was gained from the ICBG program.

As I said, the book is useful, as is this chapter. However, I have some problems with it. One is that the chapter did not describe the nature of the ICBG fully, focusing unduly on the degree to which it would lead to commercial exploitation of traditional knowledge.

Especially of concern is the fact that the author did not speak for the potential beneficiaries of the drugs that might be developed from the ICBG research. He describes later in the chapter the development of anticancer drugs as a result of materials found in plant sources. Do the tens of millions of people who might benefit from such a discovery have no right to health and longevity if the tribe living where the plant was first used object?

The chapter failed to deal with the history of granting intellectual property rights for pharmaceutical development. That is not historically an old phenomenon, but it has grown rapidly in the 20th century. I think that there is more than a correlation between the development of the intellectual property rights domain, the growth of research pharma, the rapid development of pharmaceutical technology, and the reduction of some kinds of disease burdens. Surely intellectual property rights law can be improved and will need to be modified to meet changing needs, but Brown should at least consider the possibility that it is better at encouraging the development of new and important drugs that alternatives before us, including the alternative of protecting the cultural traditions of indigenous peoples.

I happen to believe that the basis of U.S. patent law is appropriate. Knowledge should be in the public domain. Patents are granted in part to prevent knowledge being guarded as a trade secret. They grant only a temporary exclusion of others from certain, commercial applications of new knowledge. They do so in order to stimulate innovation.

I personally see little utility in giving people a perpetual right to exclude others from the exploitation of knowledge developed by their ancestors, which is apparently what some people want for the pharmaco-medical knowledge of indigenous peoples.

This approach, if taken to its logical conclusion, would exclude all such indigenous peoples from the use of knowledge developed not only in advanced Western societies but also by other indigenous peoples. Obviously, the balance would be negative for the very people we seek most to help and protect. (Check out my recent posting on the Nine Wonders of Intangible Heritage.)

The chapter does make an interesting and probably valid point that the institutions of indigenous societies are different than ours. As a consequence, not only is it sometimes difficult for scientists and businessmen from the United States to identify appropriate representatives of indigenous communities, sometimes the very effort to do so is doomed to fail because the communities have not institutionalized such representation and will not properly understand the questions as to who is to represent them. Equally, NGO's seeking to take up the cause of the indigenous population against the outside scientists and businessmen may find it impossible to find an appropriate authorizing agency (although they seem less sensitive to the problem than did the scientists we funded.) The worst scenario is when the scientists and business people feel that they have been authorized by one group who legitimately represents the community, the NGO feels that it is authorized to speak for a different group which it feels legitimately represents the community, and the two groups are rivals and disagree!

The chapter deals with Shaman Pharmaceuticals, a firm that pioneered the use of ethnobotany in its research to develop new pharmaceutical products and which sought to feedback some funding to the communities from which it got its leads. The chapter recognizes that far from making huge profits, the company lost lots of its investors money. It has since failed entirely. The business of bioprospecting is a hard one, and one not likely to reward unwary investors. It is not the profit bonanza pictured by the press and NGO.s.

I must admit the discussion of the Rural Advancement Foundation International (RAFI) made me angry. This NGO was apparently very active in opposing bioprospecting by commercial firms in areas in which indigenous peoples lived, on the basis that they considered such efforts exploitive. Of course, I am all for people expressing their views and advocating for the weak. However, I disagree fundamentally with RAFI (which apparently has since changed its name to the ETCGroup but continues to "address the socioeconomic and ecological issues surrounding new technologies that could have an impact on the world’s poorest and most vulnerable." RAFI is now apparently advocating against a range of technologies from biotech to nanotech which offer real hope to help indigenous peoples.

I feel that the media tends to pay undue attention to NGO's that oppose technologies. Years ago Douglas and Wildavsky suggested that in our modern age NGO's could survive and thrive by making loud charges against "pollution", thereby gaining lots of small donations from people slightly interested in their charges. I fear the media finds the controversy generated by such NGO's worthy of broadcast, since it interests audience and draws attention, which in turn draws advertisers and revenues. We need a media that gives more weight to expert scientific judgment and less weight to populist alamists.

Saturday, June 30, 2007

Biological Diversity

During Charlie Rose's conversation with Paul Simon on PBS they talked about E. O. Wilson. If anyone does not know, Wilson is a world expert on ants, the controversial author of the theory of sociobiology, and a double Pulitzer Prize winner. He is also perhaps the smartest person I have ever met, and I have met some very smart people, including about a dozen Nobel Prize winning scientists. However, I think of Professor Wilson first as probably the world's most influential advocate for the preservation of biodiversity. It occurred to me that I should write to support him in that effort. Among his other works, Wilson has published these on biodiversity:
We don't really know much about biodiversity. We have a pretty good count on the number of species of animals, but we find new species even of primates from time to time. We can estimate the number of plant species and are moving toward an inventory of those species. Estimates of the numbers of insect species on earth are quite rough, and there is a long way to go to identify and describe all those species. As far as I can see, we can make only the crudest estimates of the number of microbial species, and we can not culture most of them, much less describe them adequately.

New techniques in genetics are improving our understanding of the diversity of life. We are learning, for example, that scientists had in the past misidentified similar appearing species as one because their appearance belied their underlying genetic differences which would prevent interbreeding. The new techniques offer the possibility of understanding within species genetic diversity. Indeed, it is the new techniques which are for the first time allowing us to estimate the diversity of microbial species.

Evolution tells us that species come and go. There are always new species coming into existence and species going extinct. Mankind has, especially in recent history, changed the rate of extinction of species. Once, say before Columbus, of species plants and animals evolved separately on the different continents, and in "island ecosystems" so separated as to prevent migration among enclaves with similar ecological conditions. Mankind changed that situation, moving species from area to area, often inadverantly. More importantly, we have modified ecologies to meet the needs of our own, planting huge areas with monocultures of useful crops. We have allowed huge areas that we could not use or could no longer use to degrade environmentally. Global climate change will exacerbate the situation, and almost certainly the growing human population and the growing footprint of the average human being will lead to further, faster environmental degradation.

As a result, species are going extinct at a very high rate and that rate can be expected to increase during this century. Unless mankind acts force to preserve biodiversity, we can expect to see a considerable reduction in the number of species of animals, plants and insects in the next hundred year.

Why is this important? First the wanton destruction of biodiversity is wildly imprudent. We don't understand ecology well enough to predict the impact of the radical simplification of the biosphere on human wellbeing. We have only this one earth on which to live, and if we screw it up......

It has been said that world history is written in shifting sands. Civilization after civilization has fallen when its environment could no longer sustain its population with the technology it had in hand. The tipping point may be a climatological anomaly -- e.g. persistent drought or a little ice age -- but the problem comes from over use of the environment. The ruins of the civilization found in the desert which it helped to create. Now that we are developing a global civilization, we will have nowhere to move if we destroy the environment on which it depends.

I think we are about to see a biological revolution. Evolution has stocked the world with an enormous wealth of genetic diversity. Mankind is just beginning to unlock the keys to understanding that diversity, and will surely make enormous strides in learning how to utilize genes to benefit humans. Each species is like an encyclopedia of genetic information, created through eons of time. Each species lost is lost forever, and all that information is never to be regained. The rapid extinction of species will limit the scientific knowledge we can produce, and it will limit the ways in which we can exploit genes for man's benefit. The ramifications will be felt in medicine, agriculture (including forestry and aquaculture), and industrial processing.

There is also what might be termed an aesthetic reason to maintain biodiversity. People like having the ecosystems that we are losing. We find them beautiful. We enjoy the diversity of life. We mourn not only the loss of "charismatic mega-species" when they are reduced in numbers or go extinct, but also individuals of those species. Think of the efforts to save whales that find themselves in dangerous human dominated waters, or the sadness when a favored zoo animal passes away. We enjoy seeing a beautiful specimen tree, a flock of birds, or a butterfly.

Ultimately, it seems morally wrong to wantonly destroy the diversity of life on earth. By what right does man do so? How we will be judged by future generations if we leave them a denuded world bereft of biodiversity?

What are we to do to protect biodiversity. Certainly science is a priority. We have to devote the resources to understand biodiversity and how it can be managed and protected. Certainly too, we have to develop public policies at national and international levels to stop environmental degradation and protect biodiversity. We must protect immediately those biodiversity hot spots that are endangered. (Tropical areas have more diversity than areas further from the equator, and some areas for geographical and ecological regions have very high numbers of species found no where else in the world. Unfortunately, some of these areas are gravely threatened by encroaching human use or environmental destruction. This combination of threat and diversity calls out for an emergency response.) More fundamentally, we must move towards policies that provide long-term protection for the environment and biodiversity.

The failures of the United States government to do so are especially sad, given that as the world's most wasteful nation we cause a disproportionate part of the problem, and as the world's greatest economic and military power, this nation could -- were it to choose to -- provide global leadership in this good cause.