Month: November 2024

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10 year study on the river Otter shows the benefit of beavers to the river

This is the place were beavers first appeared in 2008, though were only fully recognized in around 2013. A full study on the impact of these animals on the river, was launched in 2014 and after 10 years it has reported. The results are incredible, with much of the local environment totally changed.

Space along the river was given over to the beavers, and they have taken full advantage. Their dams mean that in storm conditions, surges are 30% smaller, allowing the river to cope, and not flood towns along its route. An estimated 24 million litres of water is now stored in these beaver areas. This has in turn created areas where toads, water voles dragon-flies and even otters are able to thrive.

Similar impacts have occurred in other places where beavers returned such as Scotland.

Clearly, we should be looking to facilitate the spread of the beavers, and translocating them to suitable rivers up and down the country. Our rivers are known as some of the dirtiest in the country. While much of the blame for this lies with sewage treatment, beavers would likely have a fantastic impact on this.

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Rare black tiger spotted in Odisha

A tiger with these markings is rare, but it is not the first time – video at the bottom of the page

Cats are one of the families of species that perhaps show rare colourations relatively regularly. I say relatively, because naturally these can be very rare. Like a black leopard or a king cheetah, these can exist as a recessive gene.

Having said this, a tiger with more black on it, may well be better at hunting when there is little light, which could boost its chances of breeding effectively. This picture is from late in 2023, from Similipal Tiger Reserve in Odisha. There is a significant history of this genetic mutation in this reserve (though that is not particularly surprising, as black leopards and similar are also genetic so tend to occur in the same area for a time).

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Grolar bears or Pizzly bears remain rare in the wild, according to study

Pizzlies in Osnabruck photo credit Corradox CC by SA 3.0

I wrote, yesterday about the fears for the future of the polar bear species, and the problems that global warming are causing. Today, I am writing about another news subject from a few months ago – that of hybrids between brown bears and the polar bears.

Polar bears as a species, are only though to be between 150,000 and 1.7million years old, with most putting their estimate at around 600,000 years. This is very young for a species, and they descend from brown bears, with a 2011 study finding that female polar bear DNA seems to originate from a group of brown bears living in Ireland during the last ice age when vast ice sheets stretched from there to the north pole, and allowed polar bears to truly wander far and wide.

Pizzly’s and Growler bears, while found in nature on rare occasions, would have naturally been so rare as to be insignificant. It is only human caused global warming which has forced these animals together – and regular meetings in the natural world, of closely related species, usually ends up with offspring.

These hybrids (male polar bear and female grizzly ends with a Pizzly bear, while a female polar bear and a male grizzly ends with a Growler bear) are likely to become more common. Polar bears will increasingly have to head south, to be able to survive, and Grizzly bears will increasingly head north for cooler environments, bringing them into contact more and more often.

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Donald Trump is president again – impact on the world

I am not going to pretend that this is not bad. Donald Trumps former term was bad for the natural world and the fight against climate change. Likely changes:

  • Leaving the Paris climate agreement again – there is some suggestion that this will lead to a collapse of the agreement. Trump has pushed coal among other fossil fuels, and is likely to roll back various progress. Perhaps a possible hope is Elon Musk and his closeness to Donald Trump – might this relationship mean that less is done against electric cars? Last time, the USA carbon emissions fell despite everything that Trump did (definitely not because). Keeping temperature increases to just 1.5 degrees Celsius is pretty much impossible, if the USA does not do its part.
  • Denialism and doubt will return – it is not just that Donald Trump is not willing to work towards the end of carbon emissions, but he does not believe that global warming is real. This is a real indictment on how he forms his views of the world, as it is a simple fact that the world is warming
  • Clean energy policies will go, along with scientific decisions on wolves and other wildlife within the country. This is quite likely to have an impact on global biodiversity, as the USA will abandon its lead on this.
  • Under Trump the first time, protected status for species no longer required the same protections, and much wilderness in the USA lost its protection. A return to office is likely to make this far worse.

The situation is serious. Having been president before, it is highly likely that trump will be more effective this time, as he knows more than last time. He has retaken the Senate, and it looks like he is going to take the house as well. Will he manage to use his position more effectively? Leadership on climate, biodiversity and many more things will fall open, we must wait and see if other countries step up to fill their shoes, and continue to push forwards.

We are in for another bumpy road

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Is Asia’s plummeting fertility rate a going to lead to a crisis, or might it help save the planet?

A large crowd

Of the slightly over 8 billion humans on earth, 4.641 billion, or just under 60% live in Asia. While this is expected to grow to 5.25 billion people in 2055 it will only be 54% (due to increasing populations elsewhere in the world) of global population at the time.

So, what is the problem? An average fertility rate of 2.1 is currently considered necessary to maintain population levels (that is, 2.1 births per female). When the fertility rate drops below this rate, there are not enough babies being born to replace all of the people dying. As environmentalists, this is good, as the human population is thought (by some) to be too high to sustainable retain long-term (estimates as to what population the earth can sustain long-term range from a relatively small 0.65 billion to an enormous 9-10 billion). Of course, it depends on what we consider as sustainable survival – for me, and I hope for most of you, what I would consider sustainable, would be a low enough population to allow all other species on earth to thrive, so I would suggest that a number near the bottom of this list is more reasonable.

Below, we will look at a range of Asian countries with large populations

Continue reading “Is Asia’s plummeting fertility rate a going to lead to a crisis, or might it help save the planet?”
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Polar bears are on a collision course with humans

A group of tourists watching a polar bear in its natural habitat

Polar bears are wild creatures. They roam widely, with some having been tracked to a home range of over 6.000,000 square km. One individual was found more than 4000km from where it was before.

Its not even an issue of just giving them a large reserve, as they spend the cold winters roaming far and wide across the worlds oceans. Even in a country like Canada or Greenland, it is not possible to exclude humans from that much land.

Continue reading “Polar bears are on a collision course with humans”
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