Due to the fact that Anomalocardia brasiliana occurs
predominantly in the first 10 cm of the sediment column
(Silva and Silveira, 1992; Narchi, 1972; Schaeffer-Novelli,
1980), we used a circular collector with an area of
0.0192 m2 buried approximately 10 cm into the substrate
to collect the animals. The collected specimens were
washed, and subsequently stored in labelled plastic vials
and frozen for further analysis. The sediment was collected
using a galvanised iron collector with a diameter of
5.6 cm and a length of 10 cm. The collected material was
analysed at the Laboratory of Limnology of the Brazilian
Federal University at Mossoró-RN (Universidade Federal
Rural do Semi-Árido, UFERSA). Shell length of all
living individuals of A. brasiliana was determined using
a 0.05 mm precision caliper. The sediment was collected
using a galvanised iron collector with a diameter of
5.6 cm and a length of 10 cm. For the analysis, the samples
were oven-dried at 60 °C until constant weight. Sub-
Due to the fact that Anomalocardia brasiliana occurspredominantly in the first 10 cm of the sediment column(Silva and Silveira, 1992; Narchi, 1972; Schaeffer-Novelli,1980), we used a circular collector with an area of0.0192 m2 buried approximately 10 cm into the substrateto collect the animals. The collected specimens werewashed, and subsequently stored in labelled plastic vialsand frozen for further analysis. The sediment was collectedusing a galvanised iron collector with a diameter of5.6 cm and a length of 10 cm. The collected material wasanalysed at the Laboratory of Limnology of the BrazilianFederal University at Mossoró-RN (Universidade FederalRural do Semi-Árido, UFERSA). Shell length of allliving individuals of A. brasiliana was determined usinga 0.05 mm precision caliper. The sediment was collectedusing a galvanised iron collector with a diameter of5.6 cm and a length of 10 cm. For the analysis, the sampleswere oven-dried at 60 °C until constant weight. Sub-
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