Variation in gametophyte dominance in populations of Chondrus verrucosus (Gigartinaceae, Rhodophyta)

Bellgrove, Alecia and Aoki, Masakazu N. 2008, Variation in gametophyte dominance in populations of Chondrus verrucosus (Gigartinaceae, Rhodophyta), Phycological research, vol. 56, no. 4, pp. 246-254.

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Title Variation in gametophyte dominance in populations of Chondrus verrucosus (Gigartinaceae, Rhodophyta)
Formatted title Variation in gametophyte dominance in populations of Chondrus verrucosus (Gigartinaceae, Rhodophyta)
Author(s) Bellgrove, Alecia
Aoki, Masakazu N.
Journal name Phycological research
Volume number 56
Issue number 4
Start page 246
End page 254
Total pages 9
Publisher Wiley-Blackwell Publishing Asia
Place of publication Carlton, Vic.
Publication date 2008-12
ISSN 1322-0829
1440-1835
Keyword(s) dispersal
gametophyte
isomorphic
macroalgae
phase dominance
resorcinol-acetal test
tetrasporophyte
Summary We describe the abundance, including spatial and temporal variability, of phases of the isomorphic Chondrus verrucosus Mikami from Japan. Chondrus verrucosus occurred in a dense (∼90% cover) and temporally stable bed on a small, isolated rocky outcrop (Oyakoiwa) in Shizuoka Prefecture. Small vegetative fronds were always much more abundant than large vegetative and fertile fronds over the spring to late summer periods in 1999 and 2000. Over the same period, fertile carposporophytic fronds were generally more abundant than fertile tetrasporophytic fronds, and fertile male fronds appeared infrequently at low densities. Using the resorcinol-acetal test, we determined the proportion of gametophytes and tetrasporophytes in three populations of C. verrucosus: Oyakoiwa and Noroshi (Shizuoka) in the summers of 1999 and 2000 and Kamehana Point (Miyagi) in autumn 2000. All populations had a significantly higher proportion of gametophytes than tetrasporophytes in both years, although gametophytic proportions were lower at Noroshi (∼70%) than at Oyakoiwa (∼80%) and Kamehana Point (∼97%). However, examination of all isolated individuals sampled on Noroshi showed equal proportions of each phase in 1999, but gametophyte dominance (74%) in 2000. Differences in dispersal and spore production between phases are discussed as mechanisms potentially contributing to variation in gametophyte dominance.
Language eng
Field of Research 060701 Phycology (incl Marine Grasses)
HERDC Research category C1 Refereed article in a scholarly journal
Persistent URL http://hdl.handle.net/10536/DRO/DU:30017420

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