Tag Archives: environment

Jellyballing the Jellyfisheries

People eat jellyfish, and therefore people fish for jellyfish. They call the practice jellyballing — because if you get a chance to name something, you should name it something cool. Unfortunately, far more jellyfish are caught each year than previously assumed. We currently have no idea what effect this is having on the jellyfish population, or what effect overfishing jellyfish will have on the marine ecology. Considering we’re overfishing pretty much everything in the ocean, I imagine it’s not going to be good. Hakai has a short piece on this, well worth the read.

(image copyright Brocken Inaglory)

14-Spotted Lady Beetle

This photo was taken on October 23rd 2015 in Cuernavaca, at an altitude of 1580 metres. I’m going to go ahead and call it a 14-Spotted Lady Beetle, Propylea quatuordecimpunctata. I’m almost completely certain the ladybug in the picture is the same species as the larvae gathered near it. There were lots more around the tree, but this was the best shot I could get. It also looks remarkable like Coccinula quatuordecimpustulata, which is a page in Swedish, and I don’t know if they’re different species that look similar or whether there’s taxonomic confusion/rivalry going on. Apparently they’re invasive in North America.
14-Spotted Lady Beetle

The photo below was taken on May 15, 2015, in Cuernavaca at an altitude of 1893 metres. It could be the same species with the yellow dots joined up. It’s on a castor plant.
14-Spotted Ladybug 2
Here’s a better photo from September 10, 2015.
14-Spotted Ladybug3

Seals, Whales and Dolphins back in the Thames

This is good news for everybody – seals and whales and dolphins have been spotted swimming in the Thames, a river which has spent several decades more or less officially dead. When I went to London almost twenty years ago everyone was excited because they’d found a dead fish in the Thames, and not the type of fish a person would buy in a fish shop, which implied that at one point it had been a live fish in the Thames. Of course there were those who said it was just a prank… but long-term concerted efforts at rehabilitation have paid off, with many people now spotting seals, whales and dolphins in the Thames river, which implies there are fish there for them to eat.

They’re not just in the mouth of the river either, but way upstream, past the Big Smoke, as you can see on the interactive map available here.

This is a good sign that there is hope for even the most destroyed of environments if we put in a bit of effort, and also that humans can live with other animals with just a little bit of forethought.

An Environment of Garbage

Today I helped clean up a local barranca – a small valley with a creek at the bottom – that is filled with rubbish. People have been throwing crap in there for decades, probably a lot longer. The problem we found is that the sides of the barranca now consist of little more than rubbish.
Rubbish

As you can see, those plastic garbage bags are under the dirt and leaf litter, and the tree has started growing over the top of them. There are places where under the garbage bags are more garbage bags, and there’s a very real possibility that if we remove all the garbage the wall of the barranca will collapse, which will be bad news for everyone.

So we made some pools in the creek, to help filter out bits of rubbish before they get swept downstream, and planted a couple of different species of papyrus plants to help clean the water as well. Based on the advice of an old biologist who has seen this sort of thing before, we’re going to reinforce the barranca with a series of terraces…hopefully with government help.

It’s a little disheartening to realise that it is effectively too late to completely rehabilitate an environment, and the best we can do is mitigate and hide the problems.

Iguana Farming For Beginners

A week ago I went to a course on iguana farming, basically to see whether I could set one up in my backyard. This course is a result of a central strategy of the Mexican government in its Program of Conservation of Wildlife and Production Diversification in the Rural Sector; they created the category of UMA (Units of Conservation, Management, and Sustainable Use of Wildlife) to let people farm native animals and plants.

The idea is to use the native ecologies to produce income rather than replace it with monocultures and grazing herds of introduced species. This includes animals that are on the endangered list. If the UMA is built correctly there are quite a few subsidies for the farmers, to help with construction of infrastructure. There are two main types of UMA: Intensive UMA which breeds animals in enclosures, and Extensive UMA which utilises the animals in their native environment. People create an UMA to breed and/or manage animals for breeding stock, or for consumption, or for medicinal purposes, for ecotourism, for hunting, for releasing into the wild… pretty much any use for animals is allowed, as long as the UMA follows the specifications.
Iguana Negra
I was interested in farming iguanas because they’re native animals and I thought they’d allow vertical farming; that is, that I could build a tall and thin cage with lots of branches for the iguanas. Iguanas are endangered because of loss of habitat due to humanities expansions, and also due to hunting in the wild. There are a lot of reptiles that are endangered solely because they are hunted, and often they’re hunted for the pet industry.

As it turns out iguana farming isn’t for me, for three main reasons:
The green iguana, Iguana iguana, spends a lot of time in trees. The iguana native to my region is the black iguana, Ctenosaura pectinata, and they prefer to be on the ground. There are dozens of species of iguana in Mexico, and if I had more land in another part of the country I might try breeding those native to that place.
I’d need four cages. I had assumed I could have a large cage for the iguanas to breed and take it from there, but I would actually need four large cages. One for the new-borns, one for the juvenile iguanas, one for the young adult iguanas, and one for the adult iguanas. This is because iguanas are very teritorial, and the larger iguanas will prevent the smaller iguanas from eating if they’re together. I’d also need a place for eggs, and the eggs need to be removed after being laid or another female iguana might come to the nest, kick out the eggs that are there and lay her own.
Iguanas eat a lot. They need a serious amount of food in the right proportions (80% leafy greens, 15% vegetables and 5% fruit), and from what I saw the best chance of making an iguana farm profitable is to grow the food yourself. So if I do set up an iguana UMA, it would be an extensive one where I would nudge the environment to be more friendly to iguanas, and then hunt the excess lizards.
Iguana Handler
The photo above shows the adult enclosure of the UMA we visited. That’s the main breeding male being held by the owner. Those stacks of building bricks provide both a perch for the iguanas so they can regulate their temperature, and caves for them to hide in; if they can’t hide, they get stressed. This just has a concrete wall surrounding it so the iguanas can’t escape, a pile of dirt (off screen) for them to lay eggs, and those piles of building bricks. In the course we were told we needed trees to provide a bit of shade and habitat, but the lady running the UMA said it made handling the iguanas difficult. Still, you can’t see other iguanas because they’re all in the artificial caves hiding from the intense heat.
Iguana Enclosure
This is an iguana enclosure that is sealed with wire, which keeps predators from getting in and eating the iguanas. We were told how a cat got into one of the juvenile enclosures and killed 120 iguanas just for fun…because people don’t think it’s their responsibility to control their cats. This particular enclosure holds juvenile iguanas, as well as some Australian Bearded Dragons, but is a good example of what is need for new-born, juvenile and young adult enclosures. As stated, predators are kept out. That black plastic around the doors is to keep the iguanas away so people can enter without hurting them, and without them escaping. The bricks are there for caves, and there’s also some plants of a type that iguanas don’t eat, so the leaves are left there (these are castor plants). You can see bowls with pellets, but the juveniles also need living protein, which is provided in the form of tenebrios (mealworms).