Small-scale temporal variation in propagule supply of an intertidal red alga

Bellgrove, Alecia and Aoki, Masakazu 2006, Small-scale temporal variation in propagule supply of an intertidal red alga, Phycologia, vol. 45, no. 4, pp. 458-464.

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Title Small-scale temporal variation in propagule supply of an intertidal red alga
Author(s) Bellgrove, Alecia
Aoki, Masakazu
Journal name Phycologia
Volume number 45
Issue number 4
Start page 458
End page 464
Publisher International Phycological Society
Place of publication Odense, Denmark
Publication date 2006-07
ISSN 0031-8884
Keyword(s) Chondrus verrucosus
Propagule supply
Spore release
Supply-side ecology
Temporal variation
Tidal rhythm
Summary Information on the variability in supply of algal propagules is scarce, hindered by the difficulty in identifying propagules, but this variability may affect the distribution and abundance of algal assemblages. This study examined the small-scale (½ hourly to hourly) temporal variation in propagule supply of Chondrus verrucosus (Gigartinaceae, Rhodophyta) over a dense, isolated bed in south-eastern Japan in summer and winter of 1999. Either 0.5 litre scoop samples or 5 litre pump samples were collected ½ hourly to hourly over 13, 22.5, and 30 h on three occasions in summer (June & July) and 32 h on one occasion in winter (December). Sampling was conducted around either the new moon (two occasions in summer) or full moon (one occasion in both summer and winter) and incorporated full tidal sequences including daytime (summer) and nighttime (winter) low-low (LL) tides. Chondrus verrucosus was the only red alga with spores within the size range of 15–20 μm that was fertile in the study area and surrounds at the time of sampling facilitating identification of spores. Spores in scoop samples were settled onto Petri dishes and identified on the basis of cell shape, colour and size. Pump samples were filtered onto transparent membrane filters and identified using epifluorescence microscopy: C. verrucosus spores fluoresced bright yellow and were easily distinguished from other micro-organisms of similar size, which fluoresced red or green. Results showed that while propagules could be found in the water column at most times, propagule supply of C. verrucosus was greatest during the 1–2 h period following LL tides. Variability in propagule supply was less than in previous studies examining surface or offshore waters. Spore release is thought to be stimulated by either desiccation or salinity changes associated with periods of emersion at low tide followed by re-immersion on incoming tides.
Language eng
Field of Research 060205 Marine and Estuarine Ecology (incl Marine Ichthyology)
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006, International Phycological Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30003876

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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