Morphotypes, structure trophique et état de maturité de la nématofaune de la lagune de Bizerte
DOI:
https://doi.org/10.71754/instm.bulletin.v33.670Keywords:
Pollution monitoring, Sexual maturity, Environmental effects, Sedimentation, Turbidity, Feed composition, Indicator species, Nematoda, Marine, Tunisia, BizerteAbstract
Ten samples of sediments and repository waters were taken from the coastal domain of Bizerte lagoon during winter 2001. Our results showed that proportionality exist between body width of nematodes and sedimentary loads of silt/clay and metals. In other side, the trophic structure of nematodes was associated with turbidity and water nitrites. Indeed, selective deposit-feeders, mainly bacterivorous, were positively correlated with concentration of water nitrites and then with bacteria’s nitrification. The nematodes 2A, feeding benthic diatoms, were negatively related to turbidity. Positive correlation was recorded between sedimentary manganese and the ratio related non-selective deposit-feeders with epigrowth-feeders 1B/2A. In the other hand, juveniles seem probably more sensitive to the sedimentary hydrocarbons than adults.