Inter-annual spring variations inmorpholigicparameters length, biovolumeof AcartiaClausi (Copepoda) in the central Moroccan Atlantic coasts

The present work is a temporal follow-up of the morphometric variations of the size (prosome), the body volume and the proportion (prosome / urosome) of the Acartia Clausi copepod, which were studied over a period of (1999, 2000, 2003, 2004, 2007, 2008 and 2017) in the coastal area of Agadir. Strong morphological differences were observed between the populations collected by the different samples. These variations are influenced by changes in environmental parameters (temperature) in each year. This study shows that the size of copepods inhabiting a given ecosystem varies with time in relation to changes in major environmental factors (temperature). This result shows that the variation in size is mainly due to the prosome, whereas the urosome is less dependent on ecological changes during growth