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.
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Santelices, B. (1991). Production ecology of Gelidium . In: Juanes, J.A., Santelices, B., McLachlan, J.L. (eds) International Workshop on Gelidium . Developments in Hydrobiology, vol 68. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3610-5_3
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DOI: https://doi.org/10.1007/978-94-011-3610-5_3
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