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Morphometric characterization of thalassohaline Artemia franciscana populations from the Colombian Caribbean

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Abstract Aim

To establish possible interpopulation relationships among Colombian Artemia franciscana (Crustacea, Anostraca) populations. Location

Colombian Caribbean coast (Manaure, Galerazamba, Salina Cero and Tayrona) and a similar thalassohaline reference population from San Francisco Bay (SFB-USA). Methods

Morphometric characters of male and female cultured individuals of A. franciscana were measured. The populations were grouped according to: (1) population type (populations grouped according to two broad regions of origin: North America and the Caribbean coast), and (2) specific geographical origin (populations selected according to five specific local origins: Manaure, Galerazamba, Salina Cero, Tayrona and SFB) and evaluated using forward stepwise discriminant analysis (SPSS, Ver. 10). Results

Optimal discriminant variables for males grouped by the type of population were left setae and antenna length, and for females they were abdominal length and antenna length. However, for males grouped by their specific geographical origin, the optimal variables were furca length, left setae, antenna length, eye separation, abdominal width and abdominal length, and for the females, they were furca length, abdominal length, left setae and eye separation. Male and female Colombian Caribbean populations were separated from the North American populations. However, our results show that the classification based on male characters provides better group membership than females. Main conclusions

Male morphometric characters separated the type of population groups more clearly than the female characters, because all Colombian populations were correctly positioned in the Caribbean coast region and the SFB population in the North American region, with no overlapping between the two types, as was the case for the female individuals. Likewise, male individuals correctly position the Salina Cero population to its neighbouring Galerazamba population and to the other Colombian populations. In contrast, female individuals from Salina Cero did not cluster with the other Colombian coast populations (Galerazamba, Tayrona and Manaure) or with the SFB population.
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Keywords: Artemia franciscana; Caribbean; Colombia; Latin America; crustacean; morphometry

Document Type: Research Article

Affiliations: 1: Department of Plant Biology, Southern Illinois University at Carbondale, Carbondale, IL 62901, USA and 2: Artemia Reference Center and Laboratory of Aquaculture, University of Ghent, Ghent, Belgium

Publication date: May 1, 2003

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