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Abundance and size change of Hannaea baicalensis in Lake Baikal.

Abundance and size change of Hannaea baicalensis in Lake Baikal.

Authors :
Jewson, David H.
Bixby, Rebecca J.
Source :
European Journal of Phycology. May2016, Vol. 51 Issue 2, p149-155. 7p.
Publication Year :
2016

Abstract

Hannaea baicalensisis a benthic pennate diatom that predominantly grows at depths of less than a metre attached to rocks and filamentous algae in Lake Baikal, Russia. This narrow zone at the edge of the lake is subject to frequent wave action and lake level fluctuations, which combine with other factors to affect seasonal abundance. During ice cover from January to May in 2008, when lake levels decreased from 42 to 14 cm above datum,H. baicalensiscell abundance remained low (0.39 × 106cells cm–2). The main period of net cell increase occurred in autumn, when there was a period of stable lake level (±10 cm changes in water depth) that coincided with the return of nutrients during autumn overturn. Cell abundance reached 1.52 × 106cells cm–2on 31 October. Alongside the changes in abundance, cyclic size changes in cell apical lengths were found (40 to 144 µm), which were associated with timing of the length of the life cycle. Size decline occurred in both spring and autumn, with an average decrease in apical length of 36 µm per year. It took two years for the mean apical length of a single cohort to decrease from 128 µm to 56 µm, which was then below the threshold (< 65 µm) for initiation of size regeneration. [ABSTRACT FROM PUBLISHER]

Details

Language :
English
ISSN :
09670262
Volume :
51
Issue :
2
Database :
Academic Search Index
Journal :
European Journal of Phycology
Publication Type :
Academic Journal
Accession number :
114192642
Full Text :
https://doi.org/10.1080/09670262.2015.1110860