Influência da herbácea facilitadora sesuvium portulacastrum l. (aizoacea) no recrutamento e desenvolvimento de avicennia spp. l. (avicenniacea) em uma área degradada no manguezal do Rio Pacoti - Ceará

• Autor(a) principal: Freitas, César Vinícius Caldas
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
• Texto Completo: http://www.repositorio.ufc.br/handle/riufc/40500
• topic: Oceanografia; Manguezais; Ecologia dos manguezais; Ecossistema; Plantas - Pacoti, Rio, Estuário (CE)

Nurse plants begin the colonization process in mangrove areas impacted by anthropogenic disturbances, promoting secondary succession in these ecosystems. Their presence influences positively mangrove reestablishment and growth; consequently, they can be used to accelerate impacted areas natural recovery or recovery by management. The objective of this work was evaluated the role of Sesuvium portulacastrum in the Avicennia spp. recruitment and growth in an impacted mangrove area in Pacoti river. Five 2 x 2 m (4 m²) sample squares were randomized to the area with the presence of the nurse herbaceous S. portulacastrum and the control area. Between December 2017 and November 2018, monthly counts and measurements of height and diameter were performed, as well sediment collect in the rainy and dry periods. In the Sesuvium portulascastrum area, 2746 measures were made, during the period from December 2017 to November 2018, which average height was 47.11 ± 22.73 cm and average diameter was 6.82 ± 2.23 mm. In the control area, 994 measures were made, which average height was 59.73 ± 29.63 cm and average diameter was 9.12 ± 4.15 mm. The average density to the Sesuvium portulacastrum area was 14,1 individuals/m², to the control area this value was 5,2 individuals/m². Relative growth rate (RGR) was 0.01 cm/day for S. portulacastrum area and 0.04 cm/day control area. The number, average height, average diameter, average density significantly differed between the sampled areas. The rate growth at control area was four time highers than the observed at S. portulacastrum area. The lowest values of height, diameter and growth rate of Avicennia spp. in S. portulacastrum area indicate that there is competition by resources between the seedlings and between the seedlings and the herbaceous S. portulacastrum . On the other hand, the greater number of individuals and the higher average density indicate that Sesuvium portulacastrum facilitates the propagules recruitment and establishment.