levels of selection

Book review – The Ecology of Collective Behavior

8-minute read
keywords: ecology, ethology

This is the third of a trio of reviews in which I take a brief detour into ants and collective behaviour more generally. I previously reviewed The Ant Collective, a graphical introduction to ant behaviour, and entomologist Deborah M. Gordon’s Ant Encounters, a primer on how collective behaviour in ants comes about. The Ecology of Collective Behavior is the second book by Gordon that I will examine. It proposes a research programme to figure out both how collective behaviour responds to changing environmental conditions, and how it evolves. Though squarely aimed at professional biologists, this brief and interesting book is nevertheless accessible to a wider interested audience and makes its case with nary an equation in sight.

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Book review – The Evolutionary Origins of Life and Death

9-minute read
keywords: abiogenesis, cell biology, evolutionary biology

In this second foray into the biology of death, I will examine programmed cell death or PCD. You might have heard of the process of apoptosis, but, as the previously reviewed The Biology of Death mentioned, this is just one of many ways in which cells can actively kill themselves. It is a vital part of life in multicellular organisms, for instance sculpting our hands so that we are not born with webs of skin between our fingers, or allowing leaves to fall from the trees in autumn by triggering cell death in so-called abscission zones. These are small sacrifices to serve the larger organism. Surprisingly, single-celled (unicellular) organisms also show PCD. But wait, is that not tantamount to suicide? How did that evolve?

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Book review – Biology’s First Law: The Tendency for Diversity & Complexity to Increase in Evolutionary Systems

The subtitle of this book points to an observation that most biologists will anecdotally agree with. Looking at the long sweep of evolutionary history, there is indeed a clear overall tendency for life forms to become more diverse and complex. Daniel W. McShea and Robert N. Brandon, the one a biologist with a secondary appointment in philosophy, the other a philosopher with a secondary appointment in biology, here declare it the Zero-Force Evolutionary Law or ZFEL. But is this a law of nature? And does it really differ from stochastic processes or even entropy?

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