File(s) not publicly available

Antarctic patterns of shallow subtidal habitat and inhabitants in Wilke’s Land

journal contribution
posted on 06.12.2017, 00:00 by E Johnston, S Connell, Andrew Irving, A Pile, B Gillanders
Studies of east Antarctic marine assemblageson hard substrata are rare. In relation to sea-ice breakout, we assessed benthic patterns of habitat and inhabitants between islands and bays at each of two depths (6 and 12 m) across the Windmill Islands coast. Island sites experience sea-ice breakout in the austral spring, while bay sites typically retain sea-ice cover into the summer and in some places the cover is virtually permanent. Composition of assemblages differed between sheltered bays and exposed islands. Islands were dominated by macroalgae, which also varied with depth. Immediately below the ice–foot zone at 6 m, substratum space were monopolised by foliose red (Palmaria decipiens) and foliose brown (Desmarestia sp.) algae, whereas at 12 m large canopies of Himantothallus grandifolius was abundant. The understorey consisted of a mixture of turfs and encrusting red algae at 6 m, and coralline algae at 12 m. Sheltered bays hadl arge areas of sediment/algal complex and no canopy forming macroalgae. We found more sponges and hydroids in bays, and more brittle stars around islands. Experiments testing factors that covary with exposure and depth in Antarctica, such as light, sedimentation and ice scour are necessary to determine processes that maintain these striking patterns.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

30

Issue

6

Start Page

781

End Page

788

Number of Pages

8

eISSN

1432-2056

ISSN

0722-4060

Location

Germany

Publisher

Springer

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Brown University; TBA Research Institute; University of Adelaide; University of New South Wales; University of Sydney;

Era Eligible

No

Journal

Polar biology.

Exports

CQUniversity

Exports