The different taxa/groups were separated under a stereomicroscope Zeiss 475052-9901 and those samples with >300 specimens were fractionated in 20-mL aliquots.
Los diferentes taxones/grupos fueron separados bajo un microscopio estereoscópico Zeiss 475052-9901 y las muestras con >300 individuos se fraccionaron en alícuotas de 20 mL.