The Biogeography of Shallow-water Macrofauna Heard Island

Collections of23 macroinvertebrate taxa associated with Durvillaea antarctica hold fasts and 58 invertebrate taxa associated with artificial substrata coliectots are described flOm shallow-water and intertidd habitats at Heard Island. The fauna strong biogeographic affinities with the Kerguelen Island fauna and, to a slightly lesser extent, the fauna recorded at Macquarie Island but negligible affinity with the Antarctic. Experiments involving the offshore tethering of D. antarctica holdfasts indicated that epifaunal invertebrates rapidly abandoned detached holdfasts, but that the few species surviving after one day could probably survive long adrift. Key'XTords: shallow-water macrofauna, invertebrate ta.xa, DUrl!illr!er! antr!rctir:a, Subantarctic fauna, Heard Island.