Evolutionary Anachronisms in The Western Palearctic – Part I: Puzzling Pomes
In their 1982 paper Neotropical Anachronisms: The Fruits the Gomphotheres Ate, Daniel H. Janzen and Paul S. Martin defined it as a trait of a plant that is inexplicable unless seen in the backdrop of its evolutionary past. For instance, Gymnocladus dioicus, a tree in the legume plant family Fabaceae that is native to the eastern United States, produces seed pods that are poisonous to mammals, unbreakable to rodents and impervious to water, yet depend on all of these for dispersal since the seeds, the largest in the continental United States, are too heavy to be carried by wind anywhere far. As a result, each year the parent tree will produce pods that fall to the ground, where they slowly decompose over the years, even in seemingly natural habitat. This is odd because the fruit of any plant is always intended as a diaspore. Plants have outbid each other over millions of years in attempts to produce the most sophisticated designs that will allow their unborn offspring to travel and germinate a preferably long distance away from the parent. So, if the Kentucky coffeetree, as it is also called, fails so miserably at dispersing seeds away from the parent tree, despite an elaborate diaspore, one is compelled to ask, why?.
Isles of the Tasman Sea – Part I: Lord Howe
600km off the east coast of Australia, amidst the Tasman Sea, sits a tiny archipelago – the only specks of land for a hundred leagues. The Lord Howe Island Group. Today the entire archipelago is considered UNESCO world heritage due to its interesting collection of flora and fauna with high rates of endemism. Unfortunately, as is also often the case with islands, this diversity has become much diminished in historical times.
Unwelcome Guests – Coextinction of Parasites
In biology, parasitism is a form of symbiosis, a close association between species, in which one species (the parasite) exploits another (the host) for its own benefit. This aspect of harm is what separates parasitism from other symbioses, such as commensalism, in which one species sees gains while other isn’t affected. Most parasites depend entirely on their hosts for nourishment and/or habitat, and so they become intimately tied in an evolutionary context. This host dependence often leads to extreme adaptations and body plans tailored to surviving on – or in – another organism’s body.
Islands - Socotra
Isolated for 20 million years, Socotra is a world apart. It is home to numerous birds and reptiles found nowhere else, as well as a host of plants, so bizarre as to look almost alien. And yet, Socotra is in decline.
The European Wild Horse
The horse is one of man’s most important domestic animals. Just like cattle, horses descended from a once widespread wildtype that is now extinct because of human influence. The western subspecies of the wild horse, Equus ferus ferus, had a range from the Iberian peninsular to the western Eurasian steppe, where the horse was most likely domesticated. Although the domestic horse is well-known to us, the wild form is kind of elusive – it is not certain when it died out, how common it was, what it looked like, and there is not even a consensus on how to name this animal.
The Aurochs
A creature of both myth and history, the aurochs was the wild ancestor of domestic cattle, and a denizen of innumerable legends. Dying out as recently as 1627, it is one of the few members of Europe’s extinct megafauna to have survived into historical times. In this article, guest author Daniel Foidl lays out everything there is to known about the renowned beast.