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The use of substratum manipulations in field studies of seaweed colonization and growth
Title
The use of substratum manipulations in field studies of seaweed colonization and growth,
Description
Natural and artificial surfaces have been used to investigate marine fouling, succession, and pollution; for experiments on factors affecting the insitu colonization and growth of seaweeds; and for growing large quantities of commerically important species. The use of field clearings and artificial substrata, and their advantages and disadvantages in small-scale studies and commercial production are discussed. Substratum toxicity, color, roughness, large-scale heterogeniety, and water-holding capacity may affect settlement and growth, and must be considered when using artificial materials. Plates, ropes, and other substrata require support structures and may not precisely simulate cleared natural areas, but have the advantages of easy manipulation and sampling, and are the only means available for studying spores and other small stages in the field. Growing seaweeds can be an effective alternative to transplanting adults. If properly designed and placed, these substrata could be incorporated into artificial polyculture reefs., , ,
Author
Foster, Abbott, Foster, Eklund
Date
1980-01-01T00:00:00Z
Can stormwater be detected by algae in an urban reef in Hawai'i?
Title
Can stormwater be detected by algae in an urban reef in Hawai'i?,
Description
Nitrogen (N) enrichment of tropical reefs can result in the dominance of invasive algae. The invasive alga Acanthophora spicifera and the native alga Laurencia nidifica are part of a diverse reef assemblage in 'Ewa Beach, O'ahu. Their N contents and δ15N values were investigated to determine if N was enriched and to evaluate potential nitrogenous sources near and removed from storm-drain outlets. δ15N values of algae (3.8-17.7‰) were within and above the range for algae around the island (1.9-11.9‰). Elevated algae N isotope values (δ15N>+7‰, [N]>1.6%) and seawater nitrate+nitrite levels (0.59-7.93μM) indicated a mixed, high nutrient environment. The overlap in δ15N values with multiple nitrogenous sources precluded identification. However, spatial and temporal patterns did not support stormwater as the dominant, nitrogenous source. Patterns were congruent with algal incorporation of terrestrial derived N, subjected to a high degree of biogeochemical cycling. © 2013 Elsevier Ltd., Seaweeds, CODEN: MPNBA, ,
Author
Cox, Smith, Popp, Foster, Abbott
Date
2013-01-01T00:00:00Z