New mathematical theory says small organisms may not form species

Jul 24, 2013
New mathematical theory says small organisms may not form species
Is the term 'species' applicable to tiny creatures, like artemia plankton, which are under 1mm in size?

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 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."

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More information: rspb.royalsocietypublishing.or… 67/20131248.abstract

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ValeriaT
Jul 24, 2013
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ValeriaT
1 / 5 (1) Jul 24, 2013
The speed of evolution and mutation must remain always balances in accordance to life conditions. Wealthy living conditions lead to unisex life style (end of 60's) and male population will decline gradually (populations at Indonesia) in analogy to mixture of particles, which undergoes the gradual evaporation of smaller particles on behalf of large ones with lower social tension.