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CHEMICAL DEFENSE AGAINST HERBIVORY IN THE ANTARCTIC MARINE MACROALGAE IRIDAEA CORDATA AND PHYLLOPHORA ANTARCTICA (RHODOPHYCEAE)
Author(s) -
Amsler Charles D.,
McClintock James B.,
Baker Bill J.
Publication year - 1998
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1046/j.1529-8817.1998.340053.x
Subject(s) - biology , thallus , epiphyte , herbivore , gigartinales , benthic zone , polychaete , dimethylsulfoniopropionate , algae , botany , sea urchin , chemical defense , ecology , nutrient , phytoplankton
Iridaea cordata (Turner) Bory and Phyllophora antarctica A. et E. S. Gepp (Gigartinales, Rhodophyceae) are common in many high‐latitude, shallow benthic marine communities in Antarctica, but previous observations have indicated little or no exploitation by potential herbivores. We have measured retention of test disks over the mouths of the common Antarctic sea urchin Sterechinus neumayeri Meissner, and we have used this assay to examine potential chemical defenses in I. cordata and P. antarctica. Thallus disks of both macroalgal species were retained by the urchins for significantly shorter times than inert filter paper disks and much shorter times than paper disks with a feeding stimulant. Both nonpolar and polar extracts of each macroalgal species added to disks with a feeding stimulant significantly decreased retention times relative to controls. These results support the hypothesis that chemical defenses in I. cordata and P. antarctica play a role in deterring potential herbivores.