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Influence of bacteria on shell dissolution in dead gastropod larvae and adult Limacina helicina pteropods under ocean acidification conditions

Journal article
Authors A. R. Bausch
M. A. Gallego
J. Harianto
P. Thibodeau
N. Bednarsek
Jonathan N. Havenhand
T. Klinger
Published in Marine Biology
Volume 165
Issue 2
ISSN 0025-3162
Publication year 2018
Published at Department of Biological and Environmental Sciences, Tjärnö Marine Biological Laboratory
Language en
Keywords intact organic layer, et-al vulnerability, occurs, water, Marine & Freshwater Biology
Subject categories Marine ecology


Ocean acidification (OA) increases aragonite shell dissolution in calcifying marine organisms. It has been proposed that bacteria associated with molluscan shell surfaces in situ could damage the periostracum and reduce its protective function against shell dissolution. However, the influence of bacteria on shell dissolution under OA conditions is unknown. In this study, dissolution in dead shells from gastropod larvae and adult pteropods (Limacina helicina) was examined following a 5-day incubation under a range of aragonite saturation states (Omega(arag); values ranging from 0.5 to 1.8) both with and without antibiotics. Gastropod and pteropod specimens were collected from Puget Sound, Washington (48 degrees 33'19.N, 122 degrees 59'49''W and 47 degrees 41'11''N, 122 degrees 25'23''W, respectively), preserved, stored, and then treated in August 2015. Environmental scanning electron microscopy (ESEM) was used to determine the severity and extent of dissolution, which was scored as mild, severe, or summed (mild + severe) dissolution. Shell dissolution increased with decreasing Omega(arag). In gastropod larvae, there was a significant interaction between the effects of antibiotics and Omega(arag) on severe dissolution, indicating that microbes could mediate certain types of dissolution among shells under low Omega(arag). In L. helicina, there were no significant interactions between the effects of antibiotics and Omega(arag) on dissolution. These findings suggest that bacteria may differentially influence the response of some groups of shelled planktonic gastropods to OA conditions. This is the first assessment of the microbial-chemical coupling of dissolution in shells of either gastropod larvae or adult L. helicina under OA.

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Utskriftsdatum: 2019-10-24