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Growth and reproduction of bangia atropurpurea roth c. ag. rhodophyta from the laurentian great lakes

Growth and reproduction of bangia atropurpurea roth c. ag. rhodophyta from the laurentian great lakes

Aquatic Botany 28(3-4): 317-332

ISSN/ISBN: 0304-3770

DOI: 10.1016/0304-3770(87)90008-8

Bangia atropurpurea (Roth) C. Ag. is an unbranched filamentous red alga which has recently entered the Laurentian Great Lakes. It is found in a band 5-10 cm wide above the waterline in rocky littoral areas. Field observations of its seasonal and spatial distribution indicate a bimodal pattern of maximum biomass in spring and autumn with reduced biomass persisting in summer. Field observations suggest that it should have a high irradiance optimum and tolerate warm temperatures. Measurements of net photosynthesis and respiration were made at 48 combinations of irradiance and temperature. Optimum conditions were C and 750 .mu.E m-2 s-1 at which net photosynthesis was 11.55 mg O2 g-1 h-1. Optimum irradiance remained at or above 750 .mu.E m-2 s-1 at all temperatures examined. Respiration rates increased with both temperature and prior irradiance. A study of the effects of 125 combinations of temperature, irradiance and photoperiod revealed that monospore production is favored by high temperatures and increasing daylength. The combined effect of rising temperatures and increasing daylengths caused progressively more filaments to produce monospores and contributes to the summer decline in biomass.

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Accession: 005538718

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