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1. Different ecological mechanisms lead to similar grazer controls on the functioning of periphyton Antarctic and sub-Antarctic communities

Author:
Nelson Valdivia; Luis M. Pardo; Erasmo C. Macaya; Pirjo Huovinen; Iván Gómez
Source:
Progress in oceanography 2019 v.174 pp. 7-16
ISSN:
0079-6611
Subject:
Bacillariophyceae; Chlorophyta; Cyanobacteria; Fissurellidae; Miozoa; Phaeophyceae; biocenosis; chlorophyll; ecosystems; grazing; habitats; herbivores; littoral zone; models; periphyton; primary productivity; Antarctic region; Antarctica; Argentina
Abstract:
... The processes underpinning the differences between Antarctic and sub-Antarctic ecological communities are still unclear. Dispersal, drift, speciation, and abiotic environmental filtering have been considered to explain these differences; biotic interactions, however, have received less attention. Antarctic intertidal assemblages of macrobenthic grazers are characterised by numerically abundant pop ...
DOI:
10.1016/j.pocean.2018.01.008

2. Light-adaptive state transitions in the Ross Sea haptophyte Phaeocystis antarctica and in dinoflagellate cells hosting kleptoplasts derived from it

Author:
Kostas Stamatakis; Panayiotis-Ilias Broussos; Angeliki Panagiotopoulou; Rebecca J. Gast; Maria Pelecanou; George C. Papageorgiou
Source:
Biochimica et biophysica acta 2019 v.1860 no.1 pp. 102-110
ISSN:
0005-2728
Subject:
Bacillariophyceae; Chlorophyta; Cyanobacteria; Miozoa; Phaeocystis; Rhodophyta; absorption; algae; amino acids; autotrophs; chlorophyll; circular dichroism spectroscopy; fluorescence; kleptoplasts; photosynthesis; ultraviolet radiation; Antarctica
Abstract:
... Light state transitions (STs) is a reversible physiological process that oxygenic photosynthetic organisms use in order to minimize imbalances in the electronic excitation delivery to the reaction centers of Photosystems I and II, and thus to optimize photosynthesis. STs have been studied extensively in plants, green algae, red algae and cyanobacteria, but sparsely in algae with secondary red alga ...
DOI:
10.1016/j.bbabio.2018.11.016