Vol. 51 No. 4, 2012
Impacts of Salinity, Temperature, and pH on the Morphology of
Artemia salina (Branchiopoda: Anostraca)
Ben Naceur*, Amel Ben Rejeb Jenhani, and Mohamed Salah Romdhane
Unit Ecosystems and Aquatics Resources (UR03AGRO1), National Institute
of Agricultural Sciences of Tunisia, University of Carthage, 43 Av.
Charles Nicolle 1082 Tunis MahrajÚne, Tunisia
Hachem Ben Naceur, Amel Ben Rejeb Jenhani, and Mohamed
Salah Romdhane (2012)
This study was carried out on natural populations of the brine shrimp Artemia salina from 16 salt lakes
in Tunisia, with the purpose of determining the impacts of some
physicochemical parameters on morphological characters of adult
specimens. Males (n = 20) and
females (n = 20) from each
site were measured using a binocular microscope equipped with an ocular
micrometer. Up to 13 and 12 morphologic characters were considered for
males and females, respectively. The results showed that the
physicochemical parameters provoked different degrees of variation
among the studied populations. Pearson’s correlation coefficient showed
highly negative significant correlations of salinity and highly
positive ones of pH with the width of the 3rd abdominal segment, length
of the furca, number of setae inserted on the left branch of the furca,
number of setae inserted on the right branch of the furca, width of the
head, diameter of the compound eyes, and the maximal distance between
them. However, there were no or only a few significant correlation
between the temperature and different morphological characters.
Furthermore, the principal component analysis divided the different
populations studied into 2 groups based on the salinity of the brine.
Key words: Salt lakes, Physicochemical
characteristics, Artemia salina, Morphology, Tunisia.