1. Post-Graduate Program in Ecology, Bioscience Institute, Universidade Federal do Rio Grande do Norte, Natal, RN, 59072-970, Brazil.
2. Post-Graduate Program in Structural and Functional Biology, Bioscience Institute, Universidade Federal do Rio Grande do Norte, Natal, RN, 59072-970, Brazil.
3. Department of Oceanography and Limnology, Biosciences Institute, Universidade Federal do Rio Grande do Norte, Natal, RN 59014-002, Brazil.