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Multiple Interaction of Factors in the Distribution of Some Hawaiian Gelidiales (Rhodophyta)

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Title:Multiple Interaction of Factors in the Distribution of Some Hawaiian Gelidiales (Rhodophyta)
Authors:Santelices, B.
Date Issued:Apr 1978
Publisher:University of Hawaii Press
Citation:Santelices B. 1978. Multiple interaction of factors in the distribution of some Hawaiian Gelidiales (Rhodophyta). Pac Sci 32(2): 119-147.
Abstract:The biomass distribution of the three most common species of
Gelidiales on three reefs of Oa'hu was found to form zones parallel to the
shore correlated with the changing values of light intensity and water movement.
Pterocladia caerulescens was restricted to the nearshore margin of reefs,
tolerating intermediate intensities of water movement and some 30 to 100
percent of the incident light. Gelidiella acerosa occurred on the central part of
the reefs, and while having similar light tolerances had a lower water movement
optimum. Toward the seaward edge of the reef P. capillacea was restricted to
areas with high water movement and much lower incident light (down to
6 percent). Thallus size and horizontal distribution of the two species of
Pterocladia and biomass of all-three species had a seasonal cycle with a maximum
during December and a minium in May. All the biological cycles correlated
significantly with seasonal changes in light intensity and water movement
but did not relate to the seasonal changes of water temperature and

Laboratory experiments tested: the' effects of five single factors and nine
types of interactions on the growth and bleaching of the three species of
Gelidiales. Results indicate that water movement and light intensity are indeed
the factors regulating growth and bleaching of these algae in the field. Salinity
and temperature attained statistically significant effects only at values exceeding
those found in the field. In all experiments water enrichment compensated
for water movement as all three species attained maximum growth at comparatively
lower water movement intensities when grown in fertilizer-enriched
media. The enhancement of diffusion resulting in the laboratory from higher
water movement, frequent water renewal or greater enrichment counteracted
the bleaching effects of high light intensity and high temperature. This multiple
interaction seems to have major ecological influence regulating pigment
concentration, growth rate, and distribution of Hawaiian Gelidiales.
Appears in Collections: Pacific Science Volume 32, Number 2, 1978

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