Effects of wave exposure and depth on biomass, density and fertility of the fucoid seaweedSargassum polyceratium(Phaeophyta, Sargassaceae)

Autor:	Anneke M. Breeman, Aschwin H. Engelen, Jeanine L. Olsen, Wytze T. Stam, Per Åberg
Přispěvatelé:	Faculty of Science and Engineering
Rok vydání:	2005
Předmět:	POPULATION-DYNAMICS ROCKY SHORE depth Population MUTICUM YENDO FENSHOLT Plant Science Aquatic Science Sargassum polyceratium Rocky shore BROWN ALGA ALGAL ASSEMBLAGES education fertility Holdfast density CORAL-REEF Biomass (ecology) education.field_of_study biomass biology Ecology thallus size FUCALES population structure ASCOPHYLLUM-NODOSUM biology.organism_classification Thallus CURACAO NETHERLANDS-ANTILLES PATTERNS Sargassaceae Fucales Bay wave exposure
Zdroj:	European Journal of Phycology, 40(2), 149-158
ISSN:	1469-4433 0967-0262
DOI:	10.1080/09670260500109210
Popis:	Sargassum polyceratium is widely distributed around the island of Curacao ( Netherlands Antilles) where it inhabits strongly contrasting habitats. Changes in population structure have been followed in three bays with increasing levels of wave exposure at two depths: shallow ( 0 m) and deep ( 18 m). The effects of increasing wave exposure were investigated by studying three deep-water populations; and the effects of depth by studying shallow- and deep-water populations in the two calmer bays. Total density and stage density ( reproductive thalli, juvenile thalli) were determined and total and individual thallus biomass was estimated non-destructively. In the most wave-exposed deep-water population thalli were twice as long with more than twice the biomass than in the calmest deep-water population. Total density and juvenile density were highest in the bay with intermediate wave exposure. Depth was an important factor at both the individual and population level. Shallow-water thalli had basal holdfast areas that were four times larger than those from deep water, and thallus biomass was positively correlated with holdfast area. Shallow-water juveniles invested more in the development of a holdfast and lateral growth than deep-water juveniles. Total biomass per quadrat was up to 10-fold higher in shallow- than in deep-water populations. In shallow- water populations reproductive thalli were present throughout the year whereas in deep-water populations they were present only during autumn and winter. We conclude that both wave exposure and depth affect population structure. Thalli were generally bigger and total biomass higher in the more exposed bay(s) and in shallower water, contradicting the general pattern in macroalgae of reduced size and biomass with increasing wave exposure.
Databáze:	OpenAIRE
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