New publication: Interspecific interactions through 2 million years: are competitive outcomes predictable?

Lee Hsiang Liow*, Emanuela Di Martino*, Kjetil Lysne Voje*, Seabourne Rust, and Paul D. Taylor in Proceedings of the Royal Society B


Ecological interactions affect the survival and reproduction of individuals. However, ecological interactions are notoriously difficult to measure in extinct populations, hindering our understanding of how the outcomes of interactions such as competition vary in time and influence long-term evolutionary changes. Here, the outcomes of spatial competition in a temporally continuous community over evolutionary timescales are presented for the first time. Our research domain is encrusting cheilostome bryozoans from the Wanganui Basin of New Zealand over a ca 2 Myr time period (Pleistocene to Recent). We find that a subset of species can be identified as consistent winners, and others as consistent losers, in the sense that they win or lose interspecific competitive encounters statistically more often than the null hypothesis of 50%. Most species do not improve or worsen in their competitive abilities through the 2 Myr period, but a minority of species are winners in some intervals and losers in others. We found that conspecifics tend to cluster spatially and interact more often than expected under a null hypothesis: most of these are stand-off interactions where the two colonies involved stopped growing at edges of encounter. Counterintuitively, competitive ability has no bearing on ecological dominance.

Published 31 August 2016
Volume 283, issue 1837
DOI: 10.1098/rspb.2016.0981

*Centre for Ecological and Evolutionary Synthesis (CEES). See the publication for full author information.

Tags: Proc. R. Soc. B;
Published Sep. 12, 2016 2:47 PM - Last modified Sep. 12, 2016 2:47 PM