The 6 ith extinction

[Christophe]

Yes I understand the problem ... the extinction of species by humans is a fact, I remain skeptical about the disappearance of 3 species per day ...

I presume that these extinction figures are based on statistics and not actual extinction records ... in other words, according to this method, some species may disappear before they appear! (ie to be discovered ...)

And statistics ... we can tell them what we want ...

[sen-no-sen]

I presume that these extinction figures are based on statistics and not actual extinction records ... in other words, according to this method, some species may disappear before they appear! (ie to be discovered ...)

They exist different way of checking this, but everything depends on the species concerned.
For example, the disappearance of Java tiger is a fact correlated by the observation, whereas for microorganisms it is about calculations mainly based on the disappearance of ecosystems (it is indeed very difficult to list all the critters!).
What is more real than whole forests reduced to nothing?
Overall ecologists calculations what is called an extinction rate. So when we announce the disappearance of 3 species per day, this does not mean that 3 species are actually disappeared today but that over a period of given time (10ans in general) the sum of species disappeared equals this average.

On large scales of time, the species appear and disappear, the paleontological data indicating for each a lifetime of between one and ten million years. The average would be five million years. Over a period of one hundred years, it is expected that 1 / 50.000e will disappear (0,002%). If we consider that there exists between 10 and 20 millions of species, we should therefore witness the extinction of 200 400 species per century. It remains to be compared with observations over a hundred years. What was done for the twentieth century.

"The extinction rates vary enormously from one taxonomic group to another," explains Anne Teyssèdre. We must therefore be careful to specify the set of organisms considered. The estimate gives very high values. For plants, the extinction rate is 50 times higher than the average rate and this ratio is 260 for all vertebrates. For Mammals alone, it is 560 ...

"These reports are estimated only for the twentieth century, relativized Anne Teyssèdre. They should not be extrapolated because the rate of extinction is expected to accelerate. If we take the last decade of the twentieth century, we would find figures higher than those of the first decade. "

http://www.futura-sciences.com/planete/actualites/developpement-durable-taux-extinction-especes-mesurer-25715/

And statistics ... we can tell them what we want ...

It is not about politics or economy, here the figures are correlated with the actual disappearance of very large ecosystem.
The reality of forecasts is unfortunately below estimates made in the past, in fact deforestation is dramatically accelerated because of free trade and trade - among others-- palm oil ... in Borneo is close to 80% of the forest that has disappeared and for 3 / 4 over a period of less than 25 years ...

The extinction curve of species is thus strictly proportional to that of global growth, a consequence of the totalizing capacity of Exponential economism.



(Source: Center of Biological Diversity)

[izentrop]

Not only statistics, everything indicates that the time is serious.
Species that do not disappear yet are confined to fragmented territories. Inbreeding is already the announcement that they are bad.
We can not be sure of the disappearance of viruses and bacteria, but they are not the most affected because they have a great capacity for adaptation and evolution.

[Christophe]

Yes the situation is not rosy for some species ... but for others the warming is benni bread ... especially insects that go up more and more in the north and have longer breeding periods (and when we know how fast they do it ...) ... so there are losers but also winners ...

So I just want to say that giving a figure of 40 000 species missing since 1980 is neither credible nor understandable for the vast majority of people and thus decreases the credibility of the ecological discourse ... Especially if we do not give the 40 000 names ... worse it makes the speech incredulous or laughable ... I think we do not need that!

Ps: uh I know what an average ... we can go on 1000 species per year if you prefer but it does not change anything at the bottom ...

[izentrop]

The proliferation of invasive species also comes from ecosystem imbalances for lack of predators or unsuitable.

80% of insects disappeared in 30 years, also causes the disappearance of their predators: birds, bats ...

[izentrop]

These statistics are far from precise, but without precise data it is necessary to give an order of idea. Counting animals that have a characteristic song is quite accurate, otherwise it is done by sampling

[Christophe]

Yes any eco-system is based on a wise balance ... a very small variation of a lousy in a parameter can cause huge changes if the observation scale is long enough ...

80% of missing insects in 30 years

What species of insects have disappeared up to 80% in 30 years? And or? In Europe they progress rather ... we saw mosquitoes Tigers in Alsace for example ...

ps: please do not bring out the example of razed jungles because there it is obvious ... a volcanic eruption must destroy by evil also species that it is local but also global via a "nuclear" winter or rather volcanic winter ... was it not in the corner of Borneo that there was the biggest eruption of all time precisely which led to a volcanic winter of a few years?

[Christophe]

These statistics are far from accurate, but without precise data it is necessary to give itself an order of idea

We agree, say that 1000 species disappear every year so it's good statistics ... so to take with the usual precautions ...

[izentrop]

The alarm call of Hubert Reeves

[moinsdewatt]

Researchers are sounding the alarm to prevent the impending disappearance of the Gulf of Mexico whale.


01 / 03 / 2018 By Béatrice Riché

Researchers are sounding the alarm to prevent the impending disappearance of the Gulf of Mexico whale. "This mammal is likely to be the first baleen whale to disappear since the extinction of the Atlantic Gray Whale (Eschrichtius robustus) three hundred years ago," they say in a letter published on 7 last February. in the scientific journal Nature. "Rapid action is needed to eliminate the human causes of death and injury," they say.

Few people have heard of the Gulf of Mexico whale, a subspecies of Bryde's whale. Since 2017, it is classified as a subspecies "Critically Endangered" on the International Union for the Conservation of Nature (IUCN) Red List. However, this new status has attracted very little public, management and political attention.

The fin whale of the Gulf of Mexico lives year-round in the northeastern part of the Gulf of Mexico, mainly in the vicinity of De Soto Canyon, just south of Florida. "He would have taken refuge in the quieter part of the Gulf, where oil and gas activities are prohibited by a moratorium dating from 2006," says Francine Kershaw, a researcher with the Natural Resources Defense Council (NRDC). "A moratorium that is likely to be lifted in 2022," she said in an interview with Whales live.

Peter Corkeron, researcher at the National Oceanic and Atmospheric Administration (NOAA) and one of the authors of correspondence published in Nature, said in an interview with Whales Live that "The main threat to the survival of this whale is not an element in particular, but all human activities in the region, which entail risks of collision and entanglement, noise pollution and oil pollution ".

According to Kershaw, the development of the oil and gas industry (announced in the new five-year offshore oil and gas licensing program, proposed last January and including twelve licenses in the Gulf of Mexico including two in eastern Gulf), as well as two recent bills (the SECURE American Energy Act and the SEA Act) that would weaken the US Marine Mammal Protection Act, are among the most important threats to the survival of this species. whales and other whales in US waters. The potential lifting of the moratorium on oil exploration and development in the eastern gulf adds to existing threats.

It is not too late to save this whale, says Corkeron, but the numbers show the urgency to act. In 2009, it is estimated that this subspecies only counted 33 individuals. The following year, the Deepwater Horizon oil spill affected 48% of the population and caused reproductive failure in 22% of the females. How many people remain today? The researchers do not know it yet, but a new estimate is expected in the next year.

What can be done to prevent the disappearance of the whale from the Gulf of Mexico? "We need to protect the Marine Mammal Protection Act, maintain the moratorium and make the transition to cleaner, less risky energies," says Francine Kershaw. A speech that resembles the one currently held in Quebec by environmental organizations and citizen groups, in response to the recent Hydrocarbons Act and its draft regulations, to protect species at risk in the St. Lawrence and surrounding areas.

http://baleinesendirect.org/rorqual-de- ... sparaitre/