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Neotrop. entomol ; 36(5): 693-698, Sept.-Oct. 2007. ilus, graf
Article in English | LILACS | ID: lil-468101

ABSTRACT

Biomass and population structure of Constrictotermes cyphergaster (Silvestri) were studied in an area of dry forest of caatinga in the State of Paraiba, northeastern Brazil. Twelve nests of different sizes were randomly collected, being six during the dry season (November 2004 and 2005) and six during the wet season (March 2004). Soldier and worker populations varied between 4880 and 118800 individuals per nest. The ratio between soldiers and workers did not significantly vary between seasons. Biomass (measured as fresh weight) of individuals varied between 13.9 and 408.8 g per nest, and soldiers and workers had significantly greater biomass during the wet season. The estimated density of nests of C. cyphergaster was 59.0 ± 22.53 active nests/ha. Quantitative data of the study colonies and data on the nest abundance showed that C. cyphergaster encompassed some 278.2 individuals/m², with approximately 0.9 g (fresh weight)/m². These data suggest that C. cyphergaster is an important consumer of vegetal matter and, therefore, an important species affecting the nutrient cycling and energy flow in the caatinga vegetation.


A população e a biomassa de Constrictotermes cyphergaster (Silvestri) foram analisadas em uma área de caatinga da Paraíba, Nordeste do Brasil. Doze ninhos com tamanhos distintos foram aleatoriamente coletados, sendo seis na estação seca (novembro de 2004 e novembro de 2005) e seis na estação chuvosa (março de 2004). A população de soldados e operários variou de 4880 a 118800 indivíduos/ninho. A razão entre soldados e operários não variou entre as estações seca e chuvosa. A biomassa (peso úmido) de indivíduos variou de 13,9 a 408,8 g/ninho. Os soldados e os operários apresentaram significativamente maiores biomassas na estação chuvosa. A densidade estimada de ninhos de C. cyphergaster foi de 59,0 ± 22,53 ninhos ativos/ha. Dados quantitativos das colônias e da abundância de ninhos revelaram que C. cyphergaster possuía cerca de 278,2 indivíduos/m², com aproximadamente 0,9 g (peso fresco)/m². Esses valores populacionais sugerem que C. cyphergaster pode participar ativamente do consumo de matéria orgânica vegetal, sendo importante na ciclagem de nutrientes e no fluxo de energia na caatinga.


Subject(s)
Animals , Biomass , Isoptera , Brazil , Population Dynamics , Seasons , Trees
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