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Structure of a disturbed mangrove in the Rio Parnaíba delta, Piauí, northeast Brazil

2018; Wiley; Volume: 129; Issue: 2 Linguagem: Inglês

10.1002/fedr.201700017

1522-239X

L. T. L. de Araújo, Maria Francilene Souza Silva, Deimes do Nascimento Gomes, Marcelo Batista Sousa, Simon Joseph Mayo, Ivanilza Moreira de Andrade,

Coastal and Marine Dynamics

Phytosociological analysis was used to quantify the structure of a disturbed mangrove next to a tidal creek of the Rio Igaraçu, Piauí, northeast Brazil, and comparison was made with a survey made fourteen years earlier. Thirty 10×10 m plots were demarcated in three areas of ten plots each. Height and circumference of trees of circumference at breast height ≥ 15 cm were measured in 285 individuals of Avicennia germinans (L.) L., Laguncularia racemosa (L.) C.F.Gaertn. and Rhizophora mangle L. Height ranged from 1.5−15 m (mean 4.4 m) and diameter from 4.8−28.7 cm (mean 7.2 cm). Avicennia and Laguncularia showed the highest parameter values (importance values 52% and 44%, respectively). Furthest from the creek and subject to less frequent tidal flooding, only Avicennia occurred, shorter (mean height 3.8 m) and fewer (density 130 ind ha −1 ) than elsewhere. In the central area (density 1240 ind ha −1 ) Avicennia dominated Laguncularia (importance values 53% vs. 47%). All species occurred nearest the creek (density 1480 ind ha −1 , importance values Laguncularia 47%, Avicennia 46%, Rhizophora 7%), and heights and diameters were lower. Changes from a previous study suggest selective logging of larger individuals nearer the creek, especially Rhizophora , favouring regeneration of Laguncularia .