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Volume 45 - Number 2 - 2010
Article

 


Distribution of the macrobenthic fauna in the Budi coastal lagoon, southern Chile

Carlos Bertrán1, Luis Vargas-Chacoff 1,2, Fernando Peña-Cortés3, Roberto Schlatter1, Jaime Tapia4 y Enrique Hauenstein5

 

1Instituto de Zoología, Universidad Austral de Chile, Casilla 567, Valdivia, Chile

2Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de Cádiz, España

3Laboratorio de Planificación Territorial, Escuela de Ciencias Ambientales, Universidad Católica de Temuco, Casilla 15-D, Temuco, Chile

4Instituto de Química de Recursos Naturales, Universidad de Talca, Casilla 747, Talca, Chile

5Facultad de Ciencias, Universidad Católica de Temuco, Casilla 15-D, Temuco, Chile

 

E-mail: cbertran@uach.cl

 

We describe the benthic macroinvertebrate associations Budi coastal lagoon southern Chile, salt nature. They relate the abundance and biomass species with organic matter levels and types of sediment, 9 stations were chosen for sampling. The muddy bottom is the substrate dominates more than gravel, which is the least represented. Organic matter showed the highest percentages in the mud at stations Allipén and Temo with 87.35 and 84.29% respectively. 8 species were identified, distributed in the Phyla: Annelida (2), Arthropoda (3) and Mollusca (3), being Prionospio patagonica (Polychaeta, Spionidae) and Littoridina cumingi (Mollusca, Cyamiidae) the most abundant species. The highest recorded average abundance per sampling station corresponded to 351 ind. m-2 and the highest average biomass was 1.0132 g m-2 at the station Deume 2. The lowest values of diversity are consistent with the highest values of dominance. ABC curves, indicate that the Budi River, Temo, Allipén, Bolleco, Botapulli, Deume 1 y Deume 3 stations have low disturbance. The results of nonparametric ordination (MDS) indicate that there is a clear segregation into two groups. The main difference between stations is the abundance of the polychaete Spionidae Prionospio patagonica. Different macroinvertebrate communities are closely related to the levels of organic matter and sediment. It states that the macrofauna community comes in two segregations, which are related to coastal features of the lake

 

Key words: Littoridina cumingi, macrozoobentos, Mollusca, Polychaeta, Prionospio patagonica


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