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Coverage and Recruitment of the Edible Green Macroalga Gayralia sp. (Monostromataceae) in Paranaguá Bay, Southern Brazil
F.M. Pellizzari, E.C. Oliveira and N.S. Yokoya
Journal of Coastal Research
Special Issue No. 39. Proceedings of the 8th International Coastal Symposium (ICS 2004), Vol. I (Winter 2006), pp. 157-159
Published by: Coastal Education & Research Foundation, Inc.
Stable URL: http://www.jstor.org/stable/25741553
Page Count: 3
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We assessed seasonal variation in coverage and recruitment of the edible green alga Gayralia (Ulvophyceae) in Paranaguá Bay, a large subtropical estuarine system. Randomly selected rocks from Mangue Seco Beach were sampled monthly during 2002. Quadrat's percentual coverage (1 m²) was estimated from photographs and analyzed using Adobe PhotoShop software. Frond size was measured directly in situ, aiming at recruitment data. These data were correlated to temperature, salinity and nutrients. During the sampling period, algal coverage showed no clear pattern of seasonal variation and could not be related to the environmental variables studied. Although no statistically significant variation was found, we observed lower percent cover during the summer. During the winter and early spring, there is a trend toward increased coverage and mean frond size, which is probably related to lower temperatures. The results show that the target alga is present in the bay throughout the year. Peak of recruitment occurs during the winter, which seems to be the most suitable period for net placement. Conditions in the bay favor the cultivation and management of this seaweed mariculture is a mean of coping with the fisherie's depletion stocks and the impoverishment of local inhabitants.
Journal of Coastal Research © 2006 Coastal Education & Research Foundation, Inc.