Coralline algal skeletal mineralogy affects grazer impacts

Global Change Biology
Sophie J McCoy, Nicholas A Kamenos

Abstract

In macroalgal-dominated systems, herbivory is a major driver in controlling ecosystem structure. However, the role of altered plant-herbivore interactions and effects of changes to trophic control under global change are poorly understood. This is because both macroalgae and grazers themselves may be affected by global change, making changes in plant-herbivore interactions hard to predict. Coralline algae lay down a calcium carbonate skeleton, which serves as protection from grazing and is preserved in archival samples. Here, we compare grazing damage and intensity to coralline algae in situ over 4 decades characterized by changing seawater acidity. While grazing intensity, herbivore abundance and identity remained constant over time, grazing wound width increased together with Mg content of the skeleton and variability in its mineral organization. In one species, decreases in skeletal organization were found concurrent with deeper skeletal damage by grazers over time since the 1980s. Thus, in a future characterized by acidification, we suggest coralline algae may be more prone to grazing damage, mediated by effects of variability between individuals and species.

References

Jun 10, 2008·Nature·Jason M Hall-SpencerMaria-Cristina Buia
Nov 27, 2008·Proceedings of the National Academy of Sciences of the United States of America·J Timothy WoottonJames D Forester
Aug 28, 2013·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Bayden D RussellNova Mieszkowska
Sep 1, 2012·Global Change Biology·Federica RagazzolaJan Fietzke
Sep 3, 2014·Journal of Structural Biology·Susan C FitzerNicholas A Kamenos
Mar 5, 2016·Proceedings. Biological Sciences·Sophie J McCoyCatherine A Pfister
Feb 16, 2017·Environmental Science & Technology·Jonathan Y S LeungSean D Connell
Apr 19, 2017·Scientific Reports·Christopher E CornwallCatriona L Hurd
Jun 3, 2017·Science·Stanislas Von EuwPaul G Falkowski
Jun 7, 2017·Current Biology : CB·Robert S SteneckMark E Hay
Jan 10, 2018·Global Change Biology·Sophie J McCoyCatherine A Pfister

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Citations

Jul 17, 2021·Global Change Biology·Viviana PeñaJason M Hall-Spencer

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