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Volume 45 - Number 3 - 2010
Article

 


Fatty acid composition in eggs and adults of Tigriopus angulatus (Copepoda: Harpacticoida)

Paulina A. Fornes1, 2, Bernardo R. Broitman1, 4, Marcela Escobar2 y Pedro Báez3


1Universidad Católica del Norte, Facultad de Ciencias del Mar, Centro de Estudios Avanzados en Zonas Áridas, Larrondo 1281, Coquimbo, Chile

2Universidad de Valparaíso, Facultad de Farmacia, Av. Gran Bretaña 1093, Valparaíso, Chile

3Museo Nacional de Historia Natural, Área de Invertebrados, Interior Parque Quinta Normal S/N, Santiago, Chile

4Pontificia Universidad Católica de Chile, Center for Advanced Studies in Ecology and Biodiversity (CASEB), Alameda 340, Santiago, Chile

 

E-mail: paulinafornes@gmail.com


Tigriopus angulatus is a harpacticoid copepod, which inhabits intertidal pools in the South Pacific coasts. Through analysis of fatty acids by gaseous chromatography of specimens collected in Montemar area, Valparaíso Bay, central Chile, we determined the relative composition (mass percentage of fatty acids) and quantity of fatty acids (ng ind-1) of the following ontogenetic stages: eggs, non-ovigerous females, ovigerous females and males. All analyzed stages had higher relative percentages of saturated and mono-unsaturated fatty acids than high-unsaturated and poli-unsaturated fatty acids. The omega 3 family showed higher relative percentages than omega 6. The more abundant fatty acids were palmitic, stearic, oleic, eicosapentaenoic and docosahexaenoic acids. The fatty acids quantity per individual was significantly different between eggs and adult females. The adult non-ovigerous and ovigerous females showed more total fatty acids than males and eggs, and only male were quantitatively similar in fatty acids to the eggs

 

Key words: Harpacticoid copepods, polyunsaturated fatty acids, high-unsaturated fatty acids, oil droplets, lipids

 

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Tigriopus angulatus is a harpacticoid copepod, which inhabits intertidal pools in the South Pacific coasts. Through analysis of fatty acids by gaseous chromatography of specimens collected in Montemar area, Valparaíso Bay, central Chile, we determined the relative composition (mass percentage of fatty acids) and quantity of fatty acids (ng ind-1) of the following ontogenetic stages: eggs, non-ovigerous females, ovigerous females and males. All analyzed stages had higher relative percentages of saturated and mono-unsaturated fatty acids than high-unsaturated and poli-unsaturated fatty acids. The omega 3 family showed higher relative percentages than omega 6. The more abundant fatty acids were palmitic, stearic, oleic, eicosapentaenoic and docosahexaenoic acids. The fatty acids quantity per individual was significantly different between eggs and adult females. The adult non-ovigerous and ovigerous females showed more total fatty acids than males and eggs, and only male were quantitatively similar in fatty acids to the eggs
 
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