2 research outputs found
Life history traits influence in gonad composition of two sympatric species of flatfish
Paralichthys orbignyanus and Paralichthys patagonicus are flatfish with different life history traits, having in common the condition of breeding in seawater. Paralichthys patagonicus remain their whole life in open seawater and Paralichthys orbignyanus are sometimes found in brackish water bodies. As marine and estuarine food webs have different fatty acid (FA) compositions, the aim of this study was to characterize the gonadal maturation of P. orbignyanus and P. patagonicus females through the analysis of lipid content and FA profile in order to understand to what extent life history traits are reflected in the ovarian composition. During gonadal maturation lipid content increased and FA profiles changed in both species, but the lipid increase was greater in P. orbignyanus. The N-3FA and n-3HUFA proportions increased in both species but were higher in P. orbignyanus. The differences between the lifestyles of these species were reflected in the ovarian FA profile mainly as a result of differences in their FA metabolism, causing a greater accumulation of n-3FA and n-3HUFA in P. orbignyanus than in P. patagonicus. The higher lipid accumulation in P. orbignyanusâ ovaries could indicate that this species, feeding in brackish water bodies, has the possibility of storing more energy than P. patagonicus.Paralichthys patagonicus e Paralichthys orbignyanusapresentam diferentes atributos nas suas histĂłrias de vida, embora ambas se reproduzam no mar. Paralichthys patagonicus permanece toda a vida em ĂĄguas abertas, enquanto P. orbignyanus Ă© comumente encontrado em corpos de ĂĄgua salobra. Considerando que redes alimentares marinhas e estuarinas tĂȘm diferente composição de ĂĄcidos graxos (FA), o objetivo deste estudo foi caracterizar a maturação gonadal de fĂȘmeas de P. orbignyanus e P. patagonicus analisando o conteĂșdo lipĂdico e perfil FA, a fim de estabelecer se as diferenças nas histĂłrias de vida sĂŁo refletidas na composição do ovĂĄrio. Durante a maturação gonadal, em ambas as espĂ©cies, houve aumento do teor lipĂdico e o perfil FA mudou, mas o incremento foi maior em orbignyanus. As proporçÔes de N-3FA e n-3HUFA aumentaram em ambas as espĂ©cies, mas foram maiores em P. orbignyanus. As diferenças entre os estilos de vida destas espĂ©cies foram refletidas no perfil de FA dos ovĂĄrios, principalmente como resultado das diferenças no metabolismo de FA, causando maior acĂșmulo de n-3FA e n-3HUFA em P. orbignyanus. O maior acĂșmulo de lipĂdios nos ovĂĄrios de P. orbignyanus poderia indicar que esta espĂ©cie, ao se alimentar em ĂĄguas salobras, tem a possibilidade de armazenar mais energia do que P. patagonicus
Life history traits influence in gonad composition of two sympatric species of flatfish
AbstractParalichthys orbignyanus and Paralichthys patagonicus are flatfish with different life history traits, having in common the condition of breeding in seawater. Paralichthys patagonicus remain their whole life in open seawater and Paralichthys orbignyanus are sometimes found in brackish water bodies. As marine and estuarine food webs have different fatty acid (FA) compositions, the aim of this study was to characterize the gonadal maturation of P. orbignyanus and P. patagonicus females through the analysis of lipid content and FA profile in order to understand to what extent life history traits are reflected in the ovarian composition. During gonadal maturation lipid content increased and FA profiles changed in both species, but the lipid increase was greater in P. orbignyanus. The N-3FA and n-3HUFA proportions increased in both species but were higher in P. orbignyanus. The differences between the lifestyles of these species were reflected in the ovarian FA profile mainly as a result of differences in their FA metabolism, causing a greater accumulation of n-3FA and n-3HUFA in P. orbignyanus than in P. patagonicus. The higher lipid accumulation in P. orbignyanusâ ovaries could indicate that this species, feeding in brackish water bodies, has the possibility of storing more energy than P. patagonicus