title: Occurrence of annual growth rings in Rhizophora mangle in a region with low climate seasonality.
abstract: The formation of annual growth rings has been confirmed for several mangrove species in the last decade, among which is the Rhizophora mangle. However, the record of annual rings for this species was made in a region with high hydric seasonality, a widely recognized induction factor of annual rings in tropical species. In this sense, the present study aimed to verify the occurrence of annual growth rings in R. mangle in the mangroves of Guaratiba (Rio de Janeiro, Southeastern Brazil), a region with low hydric seasonality. For this purpose, the crossdating technique was applied in ten trees collected with known age (seven years). The growth rings are characterized by alternating layers of low vessel density (earlywood) and high vessel density (latewood). Multiple regression analysis indicated that growth rings width variation is driven by precipitation, water surplus, water deficit and water storage. Crossdating analysis confirmed the existence of annual growth rings in the R. mangle in Guaratiba. This discovery in a region with low hydric seasonality increases the dendrocronological potential of this species and suggests the importance of biological factors (eg. phenological behavior) as complementary inductors for the formation of growth rings in this species.
authors.affiliation: Departamento de Oceanografia Biológica, Núcleo de Estudos em Manguezais, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, 4023-E, Maracanã, 20550-013 Rio de Janeiro, RJ, Brasil, Universidade do Estado do Rio de Janeiro, Departamento de Oceanografia Biológica, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro RJ , Brazil.
authors.forename: Brunna T
authors.initials: BT
authors.lastname: Souza
authors.affiliation: Departamento de Oceanografia Biológica, Núcleo de Estudos em Manguezais, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, 4023-E, Maracanã, 20550-013 Rio de Janeiro, RJ, Brasil, Universidade do Estado do Rio de Janeiro, Departamento de Oceanografia Biológica, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro RJ , Brazil.
authors.forename: Gustavo C D
authors.initials: GC
authors.lastname: Estrada
authors.affiliation: Departamento de Oceanografia Biológica, Núcleo de Estudos em Manguezais, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, 4023-E, Maracanã, 20550-013 Rio de Janeiro, RJ, Brasil, Universidade do Estado do Rio de Janeiro, Departamento de Oceanografia Biológica, Faculdade de Oceanografia, Universidade do Estado do Rio de Janeiro, Rio de Janeiro RJ , Brazil.
authors.forename: Mário L G
authors.initials: ML
authors.lastname: Soares
authors.affiliation: Departamento de Biologia Vegetal, Laboratório de Anatomia Vegetal, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Rua São Francisco Xavier, 524, PHLC-224, 20550-013 Rio de Janeiro, RJ, Brasil , Universidade do Estado do Rio de Janeiro, Departamento de Biologia Vegetal, Instituto de Biologia Roberto Alcântara Gomes, Universidade do Estado do Rio de Janeiro, Rio de Janeiro RJ , Brazil.
authors.forename: Cátia H
authors.initials: CH
authors.lastname: Callado
mesh_terms: D001938:Brazil; D002980:Climate; D043982:Rhizophoraceae / Q000254:growth & development*; D013997:Time Factors; D014197:Trees / Q000254:growth & development