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Abstract

Sessile suspension feeders depend primarily on availability of a space to settle and access to the water column. Their sessile nature incapacitates displacement during disturbances, and they must rely on their morphology to overcome selective processes. We classified the assemblage of SSF from Mackellar Inlet (King George Island, Antarctica) according to their growth forms (GF) and epibiotic association type, the latter based on direct observation of the epibiotic behaviour of every individual. Organisms that did not comply with any previously established GF were grouped into ‘other GF’. Sampling stations were distributed across the fjord following a gradient based primarily on the distance to Domeyko Glacier (inner, middle, outer sections). Seven GF were recognised in the glaciomarine fjord: tree, bush, stalk, mound, flat, runner, and sheet. Four types of epibiotic associations were identified: basibiont, both facultative epibiont and basibiont, facultative epibiont, and epibiont. Our results showed that the tree GF were found in the inner and middle sections, mound in middle and outer, and flat across all fjord sections. These GF enhanced GF-diversity since they constituted additional substrate for most of the ‘other GF’ which had primarily an epibiotic strategy. Contrastingly, bush, runner and stalk GF were only found in the outer section of the fjord, thus the most distanced from periglacial disturbances. The GF distribution was consistent with distance to glacier, both in number and strategies. These results highlight the potentialities of the morpho-functional classification applied to Antarctic sessile suspension feeders to help understand their distribution based on adaptive capabilities.
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Authors and Affiliations

Daniela C.S. Thorne
1
ORCID: ORCID
Bernabé Moreno
1 2
ORCID: ORCID
Aldo G. Indacochea
1
ORCID: ORCID

  1. Carrera de Biología Marina, Universidad Científica del Sur, Lima 15067, Perú
  2. Marine Ecology Department, Institute of Oceanology Polish Academy of Sciences, Sopot, 81-712, Poland
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Abstract

Based on 25 interviews with high-skilled migrants, this article examines the migration of IT profession-als from Ukraine in Australia. Their migration experience – identified as ‘migration for achievement’ – is examined in three ways. First, the article sets out the structural context for migration and the formation of the achievement life strategy: (1) the emergence and growth of the IT industry in Ukraine, in combination with (2) shifts in Australian migration policy triggered by the growth of the innovation economy and demand for highly skilled migrants. Second, it examines migration decision-making and the individual motivations, values, aims and agency of migrants. Third, the article explores how achievement life strategies are recreated or transformed after migration by looking into the migrants’ adaptation, occupational outcomes, language and national identity, future plans and aspirations. The narratives of the ‘achievement migrants’ in Australia form a story of well-integrated members of Australian society and active agents of social and economic life. Given their capacity to successfully main-tain their social and economic status after migration, along with their positive contributions to Australian society in terms of social cohesion, innovation and economic production, this group can be considered a ‘brain-gain’ for Australia.

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Authors and Affiliations

Olga Oleinikova

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