OCCURRENCE AND DISTRIBUTION OF MACROALGAE (RHODOPHYTA) ASSOCIATED WITH MANGROVES ON THE AJURUTEUA PENINSULA, BRAGANÇA, PARÁ, BRAZIL

Eliane de Fátima Silva Alves, Marcus Emanuel Barroncas Fernandes

Abstract


The present study evaluates the natural occurrence and distribution of macroalgae species of the division Rhodophyta which colonize the pneumatophores of Avicennia germinans (L.) Stearn in the mangroves on the Ajuruteua Peninsula, Bragança, Pará, Brazil. Field measurements showed that mean length of the pneumatophores reached 12 cm, where five species of macroalgae were recorded: Bostrychia radicans (Montagne) Montagne, B. moritziana (Sonder ex Kützing) J. Agardh, B. calliptera (Montagne) Montagne, Catenella caespitosa (Whitering) L. M. Irvine, and Caloglossa leprieurii (Montagne) J. Agardh. Monthly evaluation revealed B. moritziana, B. radicans, and C. leprieurii occurrence on the basal and median portion of the pneumatophore during the dry period, while B. calliptera and C. caespitosa. were distributed all over the pneumatophore. B. calliptera and C. caespitosa were only recorded during the wet period. A number of species and pH presented significant differences (ANOSIM, R=0.069; p<0,05). Considering the reproductive cycle, C. caespitosa was only found during the sporophytic phase, where as B. calliptera and B. radicans> presented the tetrasporophytic phase, suggesting that the latter two species complete their reproductive cycles inside mangrove forests.

Keywords


Avicennia germinans,Mangrove forests; Intertidal zone; Brazilian Amazon coast



DOI: https://doi.org/10.31420/uakari.v7i2.97