Vol. 54, 2015
Morphometric variation of the endangered Caspian lamprey, Caspiomyzon wagneri (Pisces: Petromyzontidae), from migrating stocks of two rivers along the southern Caspian Sea
Saber Vatandoust1, Hamed Mousavi-Sabet2,3*, Majid Razeghi-Mansour4, Hosein AnvariFar5 and Adeleh Heidari2
1Department of Fisheries, Babol Branch, Islamic Azad University, Babol, Iran
2Department of Fisheries, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, P.O. Box 1144, Guilan, Iran
3The Caspian Sea Basin Research Center, University of Guilan, Rasht, Guilan, Iran
4Young Researchers and Elite Club, Azadshahr Branch, Islamic Azad University, Azadshahr, Iran
5Department of Fisheries, Faculty of Animal Science and Fisheries, University of Agriculture and Natural Resources, Sari, Iran
studies on fishes are important from various viewpoints. Studies
carried out on the Caspian Sea fishes show that many species possess
speciation and population formation microprocess running. Morphological
characteristics of the native endangered Caspian lamprey, Caspiomyzon wagneri
Kessler 1870, from migrating stocks of two major rivers in the southern
Caspian Sea were analyzed to investigate the hypothesispopulation structure and morphologic sexual dimorphism.
analysis of variance of 180 adult specimens showed significant
differences between the means of the two studied groups for 15
standardized morphometric measurements out of 31 (P
< 0.05). In morphometric trait linear discriminant function
analysis, the overall assignments of individuals into their original
groups in male and female specimens were 77.1 and 84.0 %, respectively.
The discriminant analysis showed a morphological segregation of the
studied populations based on the characters predorsal length,
interdorsal, interorbital distance, tail length, and first dorsal fin
length. The principal component analysis, scatter plot of individual
between PC1 and PC2, showed the specimens grouped into two areas but
with high and moderate overlap between two localities in males and
present study indicated that there are at least two types of
morphological forms of Caspian lamprey that had high morphometric
differentiation in the rivers across the southern Caspian Sea, which
can beconsidered in conservational policy of this valuable species.
Key words: Sexual dimorphism; Morphology; Population structure; Iran.
*Correspondence: E-mail: firstname.lastname@example.org; email@example.com