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Dr. Urzúa-Osorio, Ángel
Nombre de publicación
Dr. Urzúa-Osorio, Ángel
Nombre completo
Urzúa Osorio, Ángel Gabriel
Facultad
Email
aurzua@ucsc.cl
ORCID
3 results
Research Outputs
Now showing 1 - 3 of 3
- PublicationFatty acid biomarkers reveal the interaction between two highly migratory species in the Southern Humboldt System: the swordfish and its prey, the jumbo squid(PeerJ, 2025)
;Quispe-Machaca, Marco ;Guzmán-Rivas, Fabián ;Barría Martínez, Patricio ;Ibáñez, ChristianMarine trophodynamics refer to the transfer of energy from prey to predators. In marine invertebrates and fishes, the nutrients obtained through the consumption of food and/or prey are stored as energy reserves in certain tissues and/or organs including the liver, muscle, or gonads, and that these are subsequently used as bioenergetic fuel for highly energy-demanding fundamental physiological processes. In the southern Humboldt Current System, the interaction between two highly migratory resources and top species has been observed: the swordfish (Xiphias gladius) and its prey the jumbo squid (Dosidicus gigas). Because of this trophic interaction, these species store large amounts of energy (as lipids and fatty acids) in their main organs. However, how the fatty acid profile varies in the various organs of the predator and its prey is still unknown, as is its potential use as trophic biomarkers and the ecophysiological role it plays. Our results showed a moderate similarity between the fatty acid profile of the digestive gland of D. gigas with the profiles of the liver, gonad, and muscle of X. gladius, particularly with fatty acids: palmitic (C16:0), stearic (C18:0), oleic (C18:1n9), gadoleic (C20:1), EPA (C20:5n3), and DHA (C22:6n3). Our findings on the use of fatty acids as biomarkers of the interaction between two highly migratory species in the southern Humboldt System may reveal the degree of preference swordfish have for preying on jumbo squid, particularly through the consumption of the digestive gland. In both species, a high bioenergetic fuel content characterized by a predominance of saturated, monounsaturated, and polyunsaturated fatty acids may be necessary to sustain the high energy costs involved in their migratory and reproductive processes in the Humboldt Current system. - PublicationFatty acid profiles of highly migratory resources from the Southeastern Pacific Ocean, Chile: a potential tool for biochemical and nutritional traceability(PeerJ, 2025)
;Guzmán-Rivas, Fabián ;Quispe-Machaca, Marco ;Lazo, Jorge ;Ortega, Juan Carlos ;Mora, Sergio ;Barría Martínez, PatricioThe traceability of fish species and their resulting food products is essential to maintain the global supply of these goods, allowing us to distinguish and reconstruct the origin and history of their production chain. One way to trace food is through biochemical determinations, which aid in identifying their geographical origin quickly. This study analyzed the fatty acid (FA) profiles of highly migratory fishery resource species (HMRS) from the Southeastern Pacific Ocean (SEPO), and their use as potential tools to determine the geographic origin and nutritional condition of these marine resources. The fatty acids (FAs) presented in fillet or muscle tissue of 18 HMRS were measured as FA methyl esters by gas chromatography. Our results reveal that the swordfish Xiphias gladius presented the greatest variety of FAs, strongly characterized by the presence of saturated, monounsaturated, and polyunsaturated FAs. A similar trend of high diversity in all classes of FAs was observed in tuna species (i.e., Thunnus alalunga; T. albacares; T. obesus), oilfish (Ruvettus pretiosus) and escolar fish (Lepidocybium flavobrunneum). In turn, Lampris guttatus, Makaira indica, and Tetrapturus audax presented an intermediate variety of FAs and the highest amount of saturated and monounsaturated FAs of the evaluated species. Finally, Luvarus imperialis, Coryphaena hippurus and the sharks (Lamna nasus; Alopias vulpinus; Prionace glauca; Isurus oxyrinchus; Sphyrna zygaena) presented a low diversity of FAs, with only saturated FAs strongly predominating. Regarding the total concentration of FAs, the highest average values were recorded in X. gladius, L. flavobrunneum and R. pretiosus. The present study revealed notable differences in the FA compositions of the muscle of diverse HMRS from the SEPO off the coast of Chile, with the swordfish showing the healthiest FAs (i.e., mono and polyunsaturated) for human consumption. The data on FAs collected for HMRS could be used as a reference to characterize the FA profiles of other fisheries in the SEPO (e.g., coastal pelagic fishes). In an ecosystem approach, our findings help us to understand how essential nutrients (i.e., FA biomolecules) are transferred through the marine food web in the SEPO, revealing the diet type and/or feeding habits of HMRS considered as top predators. Furthermore, identifying the FA profiles of fishery resources at a spatial level provides crucial information for their management and conservation, particularly in those resources that are overexploited and also have a critical nutritional importance for human consumption. - PublicationTemporal variations in the bioenergetic reserves of Concholepas concholepas (Gastropoda: Muricidae) in contrasting coastal environments from the Humboldt current system(Elsevier, 2021)
; ;Lazo-Andrade, Jorge ;Guzmán-Rivas, Fabián ;Espinoza, Pepe ;García-Huidobro, M. ;Aldana, MarcelaPulgar, JoséChanges in environmental conditions play an important role in essential biological processes such as reproduction, which is partially driven by an organism’s diet. Here, we evaluate spatio-temporal variations in the bioenergetic reserves (lipids and fatty acids) of the fishery resource Concholepas concholepas (Loco), a prominent benthic carnivorous gastropod. We used data from summer (January) and winter (July) from two coastal localities that shown contrasting environmental conditions in central Chile (Quintay and Las Cruces). The results indicate that there is a correlation between the fatty acid profiles and the interactions between seasonality and locality. This was particularly evident among the fatty acid concentrations of docosahexaenoic (DHA, C22:6n-3), eicosapentaenoic (EPA, C20:5n-3) and arachidonic (ARA, C20:4n-6) acids, which were high in winter, in both localities. Contrastingly, palmitic (C16:0) and stearic (C18:0) acids were present among all comparisons at stable concentrations. These findings suggest an influence of environmental conditions on the availability and quality of the prey of C. concholepas, in both localities. Moreover, the high concentration of essential fatty acids during winter, could suggest an adaptive physiological response, to ensure reproductive success. This knowledge is indispensable to improve regulatory measures for the extraction periods of marine resources, towards a more sustainable fishery, in the Humboldt Current System.