It's another stunning Malagasy #dartfrog/#poisonfrog for today's #FrogOfTheDay, #42 Mantella cowani Boulenger, 1882! A highly threatened, actively conserved and managed frog from the highlands of central #Madagascar
#MadagascarFrogs
📸D.Edmonds/CalPhotos

This thread will cover only a tiny fraction of the work on Mantella cowanii because, being so charismatic and threatened, it has received quite a bit of attention.
#MadagascarFrogs
We start at the very beginning: the first specimens, two females, were collected by Reverend Deans Cowan in East Betsileo, Madagascar, and sent to London, where George Albert Boulenger described the species in 1882.
#MadagascarFrogs
Boulenger placed the species in his new genus, Mantella, along with ebenaui, betsileo, and madagascariensis. He recognised that the other Malagasy poison frogs were distinct from the Dendrobates of the Americas, although he did keep them in the Dendrobatidae.
#MadagascarFrogs
As more specimens were collected, it became clear that the species was highly variable. In 1978, Jean Guibé wrote with interest about this variability, describing a new subspecies, M. cowani nigricans—today a full species. #MadagascarFrogs
https://t.co/dwaHMbrYbj
Although Guibé was wrong about the affinities of those two species, it is true that there is astounding variability of colour in this (and other) Mantella species, and that they evidently hybridise with other species.
#MadagascarFrogs
📸B.Freiermuth/CalPhotos
Little was known about Mantella cowanii in the wild until the 1990s. By 1999, when Miguel Vences et al. published a revision of Mantella, it was known from a few different locations, but populations between it and M. baroni posed challenges to identification.
#MadagascarFrogs
These frogs occur in bizarre habitat in central Madagascar, often with wet, exposed rocks interspersed with low bushes.
📸Mantella cowanii Action Plan, 2021–2025 (on which more below)
The first (?) DNA-based phylogeny came out in 2002, confirming close affinity with M. baroni and M. nigricans, and showing that Malagasy poison frogs may have Müllerian mimicry generating repeated colour pattern evolution. https://t.co/4qqzbiiAev
#MadagascarFrogs
The hybridisation of M. cowanii with M. baroni received a lot of interest, in part because the species are generally morphologically and ecologically distinct.
https://t.co/VMFGZ7tP0Y
https://t.co/9uFZ7KBRzZ
International interest has always been strong in the beautiful #Mantella #frogs, so M. cowanii were targeted for the pet trade. Between 1988 and 2003, some 12,877 individuals were reportedly exported from Madagascar.
https://t.co/gJXip5xMTv
#MadagascarFrogs
In 2005, @CITES imposed a zero quota on M. cowanii, effectively banning export. For a species known from only a few locations in threatened habitat, and low fecundity (Tessa et al., see link), harvesting at these rates was unsustainable.
#MadagascarFrogs
https://t.co/SAON3F2VqF
Until 2014, Mantella cowanii was listed as Critically Endangered, but it was then downgraded to Endangered. Apparently the population declines seen until 2003 were halted by the cessation of trade. https://t.co/2rS29qFNQT
#MadagascarFrogs
Nevertheless, Mantella cowanii is heavily threatened. Representatives of @ASG_IUCN @Voakajy @amphibiansorg @chesterzoo and other organisations are actively involved in its conservation. A new action plan for 2021–2025 was just released.
#MadagascarFrogs
https://t.co/ozm89CMSSR
As I understand it, captive populations of Mantella cowanii are being maintained. So, if extirpated, it might be possible to reintroduce this frog, as long as habitat remains available. So there is hope for the 'harlequin' mantella!
#MadagascarFrogs

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Read this thread from @lilithsaintcrow. I really mean it. Just read it. Because if what she is saying is true (and I happen to think it is) it explains *so much*

An example using the Flat Earthers: A thread of many parts:


I'm firmly convinced that the flat Earth thing was started by some adolescent trolls with nothing more productive to do. They didn't believe it, but they thought it was entertaining to keep pretending that they did.

You can't engage with them, because they *are playing a game*. They think it's fun to see if they can get anybody to engage with something completely stupid as though it's true.

If you challenge them, the rules of the game state that they have to argue as hard and a spuriously as they like, but *never* to admit that the Earth is not in fact flat. I suppose you have to make up your own entertainment on 4chan or whatever hole this was conceived in.

It's annoying as hell, but I suppose it doesn't do much harm.. except to folks like this:

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Recently, the @CNIL issued a decision regarding the GDPR compliance of an unknown French adtech company named "Vectaury". It may seem like small fry, but the decision has potential wide-ranging impacts for Google, the IAB framework, and today's adtech. It's thread time! 👇

It's all in French, but if you're up for it you can read:
• Their blog post (lacks the most interesting details):
https://t.co/PHkDcOT1hy
• Their high-level legal decision: https://t.co/hwpiEvjodt
• The full notification: https://t.co/QQB7rfynha

I've read it so you needn't!

Vectaury was collecting geolocation data in order to create profiles (eg. people who often go to this or that type of shop) so as to power ad targeting. They operate through embedded SDKs and ad bidding, making them invisible to users.

The @CNIL notes that profiling based off of geolocation presents particular risks since it reveals people's movements and habits. As risky, the processing requires consent — this will be the heart of their assessment.

Interesting point: they justify the decision in part because of how many people COULD be targeted in this way (rather than how many have — though they note that too). Because it's on a phone, and many have phones, it is considered large-scale processing no matter what.