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Impacts of gastropods on epiphytic microalgae on the brown macroalga Himantothallus grandifolius

Published online by Cambridge University Press:  15 March 2019

Charles D. Amsler Open the ORCID record for Charles D. Amsler [Opens in a new window] ,
Margaret O. Amsler ,
Michelle D. Curtis ,
James B. McClintock  and
Bill J. Baker
Charles D. Amsler*
Affiliation:
Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Birmingham, AL 35233-1405, USA
Margaret O. Amsler
Affiliation:
Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Birmingham, AL 35233-1405, USA
Michelle D. Curtis
Affiliation:
Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Birmingham, AL 35233-1405, USA
James B. McClintock
Affiliation:
Department of Biology, University of Alabama at Birmingham, 1300 University Blvd., Birmingham, AL 35233-1405, USA
Bill J. Baker
Affiliation:
Department of Chemistry, University of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620, USA
*
[email protected]
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Abstract

Chemically defended benthic macroalgae that dominate shallow, hard bottom communities along the western Antarctic Peninsula support very high densities of mesograzers, particularly amphipods but also small gastropods. Previous studies have demonstrated that the macroalgae and amphipods form a mutualistic relationship. The chemically defended macroalgae provide the amphipods with a refuge from predation while the macroalgae benefit from the amphipods greatly reducing surface fouling by smaller algae. One of the three most important macroalgae in terms of overstory cover, Himantothallus grandifolius, forms huge blades that can carpet the benthos. Field observations suggest that gastropods may be higher in relative abundance in proportion to amphipods on H. grandifolius than on other overstory macroalgae. The present study documents the finding that natural abundances of gastropods on H. grandifolius maintained in mesocosms reduce fouling by microscopic algae, primarily diatoms. However, amphipods are probably also important in keeping the macroalga clean of diatoms in nature. In a smaller scale experiment, three gastropod species were differentially effective at reducing diatom coverage on H. grandifolius. The hypothesis that gastropods benefit from associating with H. grandifolius in potentially gaining a refuge from sea-star predation was also tested but not supported by the experimental results.

Keywords

Antarctic PeninsulabiofoulingherbivorymesograzersPhaeophyceae
Type
Biological Sciences
Information
Antarctic Science , Volume 31 , Issue 2 , April 2019 , pp. 89 - 97
Copyright
Copyright © Antarctic Science Ltd 2019 

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