Spatial and temporal variation in the abundance and taxonomic composition of estuarine and terrestrial macrofauna associated with mangrove logs

Abstract

Brazilian mangroves have ecological and economic importance, with molluscs, crustaceans and polychaetes being diverse and common faunal groups. The present study characterizes the macrofauna associated with logs from two mangrove forests in Pará State, northern Brazil, sampled in September, January and April, between 2008 and 2010, at three different distances from a tidal channel (2, 10, 20 m). In each forest, five logs (diameter/length: 10/40 cm) were randomly selected at each distance, totalling 15 logs per sampling date. The macrofauna was removed, counted and identified. Three-way analysis of variance was used to compare mean numbers of individuals, numbers of taxa and Berger–Parker dominance per log, between forests and among sampling dates and distances from the tidal channel. Non-metric multidimensional scaling and permutational multivariate analyses of variance were used to investigate macrofaunal structure in relation to the three factors. A total of 5437 individuals from both estuarine and terrestrial faunas was found in both forests, with 85 taxa distributed among Mollusca, Annelida, Arthropoda and Nemertea. Abundance increased from September through January to April in both mangrove forests. The most dominant species was Neoteredo reynei, representing 48% of total abundance. No significant difference in any variable was found among the two forests and between the three distances. Logs may represent a stable microhabitat for the macrofauna, with little variation in humidity, salinity or temperature, despite different distances from the tidal channel. However, macrofaunal structure varied significantly between forests and among sampling dates, probably due to seasonal differences in precipitation and salinity between both locations.

Patterns of mollusc distribution in mangroves from the São Marcos Bay, coast of Maranhão State, Brazil

“…Similar results were observed in the Amazonian mangroves from Pará, Brazil by Andrade et al (2013). Heleobia sp.…”

Brocas Marinhas E a Biodeterioração Da Madeira No Brasil: Uma Revisão Sistemática

“…De forma geral, nos estudos que foram avaliados nesta revisão, a madeira funciona apenas como uma isca para coletar os organismos xilófagos de interesse. Foi observado que o tipo de coletor varia entre painéis de madeira (MALDONATO;SKINNER, 2016;SILVA et al, 1988;BARRETO et al, 2000) e corpos de prova de madeira sólida (LEONEL et al, 2006;ANDRADE et al, 2013). Entretanto, quanto à madeira sólida, foi mais comum o aproveitamento de troncos pré-existentes de espécies do mangue (MORAES et al, 2015;TRINDADE-SILVA et al, 2009;SANTOS FILHO et al, 2008;ARAUJO et al, 1995;JUNQUEIRA et al, 1989).…”

“…Por outro lado, no Brasil, as pesquisas desenvolvidas com xilófagos marinhos têm um foco maior no viés ecológico destes organismos (JUNQUEIRA et al, 1989;NARCHI, 1997). Nestes trabalhos, a madeira é utilizada apenas como substrato para a captura destes animais, seja na sua forma sólida (SANTOS FILHO et al, 2008;ANDRADE et al, 2013) ou como painéis reconstituídos (BARRETO et al, 2000;MALDONADO;SKINNER, 2016).…”