New mathematical theory says small organisms may not form species

A new mathematical theory from the University is challenging one of the most basic ideas of biology – that the concept of a ‘species’ applies to all creatures.

In a paper, published today in the Proceedings of the Royal Society B: Biology, an interdisciplinary team of scientists, including mathematician Dr Tim Rogers, outline findings from a recent study into the mathematics of biodiversity.

Small organisms, measuring less than one millimetre, form the bedrock of the global ecosystem and their diversity is crucial for ecological health and stability. With recent advances in genetic sequencing technology, ecologists had hoped to be able to count the number of different species of such creatures by looking for groups of organisms with similar genomes.

The new results suggest that classifying very small creatures from extremely large populations into species may actually be impossible. This is because for very large populations, the gradual build-up over time of random genetic mutations leads to an overwhelming amount of diversity, possibly making the idea of ’species’ irrelevant.

Report co-author and Prize Fellow in the Centre for Networks & Collective Behaviour Dr Tim Rogers said: “We used a mathematical model to investigate some of the puzzling data on the genetic diversity of very small creatures. Surprisingly, we found that the idea of ‘species’ may not really be applicable in this case. Our findings suggest that even in very large populations, it’s the individuals that matter.”

Access the paper ‘Are there species smaller than 1mm?’ see: .

If you enjoyed this, you might also be interested in reading:

The power of network thinking – June 2013

The impact of networks and collective behaviour – June 2013

Bookmark with:

What is this?

We are one of the UK's leading universities with an international reputation for quality research and teaching. Our Mission is to deliver world class research and teaching, educating our graduates to become future leaders and innovators, and benefiting the wider population through our research, enterprise and influence. Our courses are innovative and interdisciplinary and we have an outstanding record of graduate employment.