Dynamics of species interaction strength in space, time and with developmental stage

Proceedings. Biological Sciences
Rebecca L Kordas, Steve Dudgeon

Abstract

Quantifying species interaction strengths enhances prediction of community dynamics, but variability in the strength of species interactions in space and time complicates accurate prediction. Interaction strengths can vary in response to density, indirect effects, priority effects or a changing environment, but the mechanism(s) causing direction and magnitudes of change are often unclear. We designed an experiment to characterize how environmental factors influence the direction and the strength of priority effects between sessile species. We estimated per capita non-trophic effects of barnacles (Semibalanus balanoides) on newly settled germlings of the fucoid, Ascophyllum nodosum, in the presence and absence of consumers in experiments on rocky shores throughout the Gulf of Maine, USA. Per capita effects on germlings varied among environments and barnacle life stages, and these interaction strengths were largely unaltered by changing consumer abundance. Whereas previous evidence shows adult barnacles facilitate fucoids, here, we show that recent settlers and established juveniles initially compete with germlings. As barnacles mature, they switch to become facilitators of fucoids. Consumers caused variable mortality of germling...Continue Reading

References

Jan 1, 1980·Annual Review of Biochemistry·P Nilsson-EhleM C Schotz
Jun 17, 1998·Proceedings of the National Academy of Sciences of the United States of America·J L Ruesink
Nov 1, 2008·Oecologia·Rebecca L Kordas, Steve Dudgeon
Apr 29, 2009·Oecologia·Peter S PetraitisSteve R Dudgeon
Nov 6, 2009·Ecology·Shane W Geange, Adrian C Stier
Jan 7, 2010·Oecologia·Shane Wallace Geange, Adrian C Stier
Feb 4, 2010·Ecology·Sharon K Collinge, Chris Ray
Nov 1, 2008·Ecology·Elvira S PoloczanskaMichael T Burrows

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Citations

Jun 18, 2011·Trends in Ecology & Evolution·Tom E X Miller, Volker H W Rudolf
Mar 24, 2017·Proceedings. Biological Sciences·Geoffrey C TrussellPatrick J Ewanchuk

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