RELAÇÃO ENTRE OS ATRIBUTOS ESTRUTURAIS DAS ÁRVORES DE Avicennia germinans (L.) STEARN E SUA FENOLOGIA REPRODUTIVA
DOI:
https://doi.org/10.18764/Resumo
O presente estudo avalia a influência dos atributos estruturais na fenologia reprodutiva de A. germinans. O trabalho de campo foi realizado em dois sítios na península de Ajuruteua, Bragança-PA. O Sítio#01 caracteriza-se por árvores anãs de até 4 m de altura e o Sítio#02 por árvores de até 25 m. Vinte árvores foram marcadas em cada sítio, sendo o número de flores e frutos registrados em escala ordinal. A comparação da produção de flor e fruto entre os sítios não apresentou diferença significativa (Mann-Whitney U=48; gl=1, p<0,05 flor; U=66; gl=1, p<0,05). Comparando a produção das fenofases em cada sítio, ambos não apresentaram diferença significativa (U=66; gl=1, p>0,05 Sítio#01; U=57 gl=1, p>0,05 Sítio#02). Os bosques sincronizam os períodos de floração e frutificação mostrando que apesar de apresentarem diferenças estruturais (altura), ambos conseguem manter o mesmo padrão de produção de flores e frutos, que indica ser uma estratégia onde a produção de flores é na estação seca e a dos frutos na chuvosa. Por fim, o comportamento fenológico de A. germinans mostrou-se independente do padrão estrutural das árvores estudadas, o que indica a não influência sobre a fenologia reprodutiva dessa espécie.
Palavras-chave: Avicennia germinans, fenologia reprodutiva, manguezal, Pará.
ABSTRACT
Relationship between the structural attributes of trees of Avicennia germinans (L.) Stearn and their reproductive phenology
The present study evaluates the influence of structural attributes on the reproductive phenology of A. germinans trees. Fieldwork was carried out at two sites on the Ajuruteua peninsula. Site#01 is characterized by dwarf trees up to 4 m tall. Site#02 by trees up to 25 m. Twenty trees were tagged at each site, being the number of flowers and fruits recorded in an ordinal scale. The comparison between flower and fruit yield between both sites did not present significant difference (Mann-Whitney U=48; df=1, p<0,05 flower; U=66; df=1, p<0,05). No significant difference was found at both sites (U=66; gl=1, p>0,05 Sítio#01 and U=57 gl=1, p>0,05 Sítio#02) when phenophases from each site were compared. The A. germinans stands synchronize the flowering and fruiting periods showing that both sites can present the same pattern of flower and fruit production . It seems a strategy where the flower yield coincides with the dry season and fruit yield with the wet one. In sum, the phenological behavior of A. germinans showed to be independent of the structural patterns of the trees indicating no influence on the reproductive phenology of this species.
Key words: Reproductive phenology, Avicennia germinans, mangrove, Pará.
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