Phytosociological study of intertidal marine algae：i. usujiri benten-jima, hokkaido
01 Aug 1970-Vol. 21, Iss: 2, pp 37-69
About: The article was published on 1970-08-01 and is currently open access. It has received 73 citations till now. The article focuses on the topics: Algae & Intertidal zone.
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TL;DR: Particular attention is given to the influence of substratum surface properties, both physical and chemical, on these processes, along with aspects of the derivation, chemical composition, mechanisms of release and mode of action of the various adhesives secreted by the attaching spores and germlings.
Abstract: One of the most fundamental and precarious stages in the life history of a marine benthic alga is the colonization of a new substratum. For the majority of algae this is achieved by the formation and detachment of different types of highly specialized reproductive propagules which are then dispersed via the pelagic zone. This paper reviews the process of “settlement”, “attachment” and “establishment” of these propagules. Particular attention is given to the influence of substratum surface properties, both physical and chemical, on these processes, along with aspects of the derivation, chemical composition, mechanisms of release and mode of action of the various adhesives secreted by the attaching spores and germlings.
271 citations
TL;DR: The existence of at least eight biological factors affecting predicted productivity of Gelidium crops are suggested: morphology, age of the frond, thallus part, reproductive state, seasonality, crop density, life history phase and geographic and ecological origin of the species.
Abstract: Available data on determinants of production in species of Gelidium suggest several general patterns. Species diversity is higher in tropical latitudes, whereas in temperate latitudes the size of the fronds is larger, the species are ecologically dominant and commercially viable. Typically, the species occur on rocky substrate, often on coralline crusts, associated with rapid water movement and arranged in successive belts that can extend down to 25 m depth. Yields vary among species, to a maximum of 2.0 kg m−2 y−1. Growth and production in many species can best be explained by complex interactions between irradiance and nutrients. Temperature can interact synergistically with irradiance, while water movement compensates for nutrient limitations. Increased water movement or the addition of nutrients can prevent, to an extent, bleaching by high light and high temperature. Available data suggest the existence of at least eight biological factors affecting predicted productivity of Gelidium crops: morphology, age of the frond, thallus part, reproductive state, seasonality, crop density, life history phase and geographic and ecological origin of the species. At least four events can remove or destroy Gelidium crops: extreme low tides, storms, grazing and careless harvesting. Only the last-named factor has been analyzed over more extensive experimental periods.
49 citations
Journal Article•
TL;DR: Canonical correlation indicated that temperature, water-column nutrient concentration and rainfall were positively correlated, and day- light exposure time and wind speed negatively correlated, with the dynamics of T. hemprichii.
Abstract: A bimonthly study of temporal changes in abundance and growth of the tropical seagrass Thalassia hemprichii on intertidal reef flats was conducted in southern Taiwan from October 1995 to December 1996. Thalassia hemprichii showed a marked temporal pattern in percentage cover, shoot density, and specific growth rate. There were no significant differences in the variables of T. hemprichii between the study sites. The percentage cover showed a unimodal or bimodal pattern in which one peak occurred in June or August and the other occurred in October. The shoot density was highest in June and lowest between December and February. The specific growth rate peaked in October or December, but declined in February or April. However, the temporal patterns in root:shoot ratio of bio- mass were different. Higher root:shoot ratios were observed in December or February, and lower between April and August. The above-ground biomass was always smaller than the below-ground biomass. Canonical correlation analy- sis indicated that temperature, water-column nutrient concentration and rainfall were positively correlated, and day- light exposure time and wind speed negatively correlated, with the dynamics of T. hemprichii. Among these variables, wind speed and rainfall were most responsible for the observed temporal changes in southern Taiwan, which has a monsoonal climate and distinct wet and dry seasons.
32 citations
Cites methods from "Phytosociological study of intertid..."
...A quadrat (50 × 50 cm2) divided into 25 squares (10 × 10 cm2) was placed on the substratum, and the coverage of T. hemprichii in each of the 25 squares was scored using the classes developed by Saito and Atobe (1970)....
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...The percentage cover of T. hemprichii in each quadrat was estimated according to the weighted average of the scores of 25 squares following the methods of Saito and Atobe (1970)....
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TL;DR: Biomass, production, consumption, and detrital export and decomposition of four dominant seagrass species were determined in tropical multispecies beds as a means of constructing carbon budgets to estimate the organic carbon storage rate.
30 citations
Cites methods from "Phytosociological study of intertid..."
...The coverage of each species in each quadrat was estimated according to the frequency of the mid-point percentage of 6 cover classes of the 25 squares for a given species following themethod of Saito and Atobe (1970)....
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