TITLE: Skeletons: The Frame of Life
AUTHORS: Jan Zalasiewicz & Mark Williams
DATE PUBLISHED: 2018
"Over half a billion years ago life on earth took an incredible step in evolution, when animals learned to build skeletons. Using many different materials, from calcium carbonate and phosphate, and even silica, to make shell and bone, they started creating the support structures that are now critical to most living forms, providing rigidity and strength. Manifesting in a vast variety of forms, they provided the framework for sophisticated networks of life that fashioned the evolution of Earth's oceans, land, and atmosphere. Within a few tens of millions of years, all of the major types of skeleton had appeared.
Skeletons enabled an unprecedented array of bodies to evolve, from the tiniest seed shrimp to the gigantic dinosaurs and blue whales. The earliest bacterial colonies constructed large rigid structures - stromatolites - built up by trapping layers of sediment, while the mega-skeleton that is the Great Barrier Reef is big enough to be visible from space. The skeletons of millions of coccolithophores that lived in the shallow seas of the Mesozoic built the white cliffs of Dover. These, and insects, put their scaffolding on the outside, as an exoskeleton, while vertebrates have endoskeletons. Plants use tubes of dead tissue for rigidity and transport of liquids - which in the case of tall trees need to be strong enough to extend 100 m or more from the ground. Others simply stitch together a coating from mineral grains on the seabed.
In Skeletons, Jan Zalasiewicz and Mark Williams explore the incredible variety of the skeleton innovations that have enabled life to expand into a wide range of niches and lifestyles on the planet. Discussing the impact of climate change, which puts the formation of some kinds of skeleton at risk, they also consider future skeletons, including the possibility that we might increasingly incorporate metal and plastic elements into our own, as well as the possible materials for skeleton building on other planets."
This is a book that presents a variety of skeletons as a frame for life, including the skeletons that make up or eventually produced the general environment, as well as, the organisms that lived in that enviornment. A large number of skeletons discussed in this book are generally not considered skeletons, such as tree trunks, coral reefs, and shells. Zalasiewicz & Williams discuss internal skeletons, external skeletons (insect exoskeletons, shells), large animals, microscopic organism, the skeletons required for flight, modified skeletons, and what sort of skeletons one would expect to find on other planets. The authors excell at explaining the paleontological aspects of skeletons, but seem to lack interest/knowledge in the biological aspects of skeletons. The book is interesting and not bogged down with detail. As a result, I found the book to be rather superficial in detail and thus, a missed opportunity in terms of illustration and elucidation of the various skeletons discussed by the authors. None the less, Skeletons: The Frame of Life provides much food for thought and nuggets of interesting information.