Distribución espacial y relación entre organismos fósiles. Breve síntesis paleoecológica de Toxaster colombianus y Thalassinoides

Abstract

In a strata from the upper bioesparudite from the Rosablanca Formation that outcrops by the Zapatoca Bucaramanga road at 1430 meters sea level, a counting of organisms was carried out using a grid of 1 mt2 divided into squares of 20X20 centimeters as sample units. The grid in mention was placed in a 5 meters long transect over the top of the strata. With the obtained data, using the Ludwing statistic package and the paried - quadrant variances method (PQV), it was determined that the spatial distribution patterns of the Toxaster colombianus correspond to an uniform model. Initially, a hypothesis was presented   suggesting the existence of an assembly between the T. colombianus and the Thalassinoides. But applying a contingency frame of 2X2, it was proved that there was no such assembly between these two organisms. On the contrary, the value of intensity index suggests some sort of negative interaction between them.