Trophodynamics of the jumbo squid Dosidicus gigas during winter in the Southeast Pacific Ocean off the coast of Chile: Diet analyses and fatty acid profile

Quispe‐Machaca, Marco; Guzmán‐Rivas, Fabián; Ibáñez, Christian M.; Urzúa, Ángel

doi:10.1016/j.fishres.2021.106154

Cited by 8 publications

(5 citation statements)

References 73 publications

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“…We randomly selected a total of 108 specimens for the fatty acids analyses, with 39 individuals in the large-sized group, 43 individuals in the medium-sized group, and 26 individuals in the small-sized group. The sample size was comparable to that of previous studies using fatty acids as trophic biomarkers (e.g., 18 individuals of Idioteuthis cordiformis used by Jackson et al [50]; 32 individuals of D. gigas used by Quispe-Machaca et al [25]).…”

Section: Discussionsupporting

confidence: 52%

“…Similarly, Quispe et al [24] suggested that the digestive gland had the highest mean proportion of fatty acids in three tissues (digestive gland, gonad, and mantle), which are obtained through food and stored in their organs as bioenergetic fuel and may then be used for the subsequent process of migration and reproduction in oceanic waters. Meanwhile, Quispe et al [25] investigated the variability of fatty acid profiles between the digestive gland, gonad, and mantle muscle of squids and the prey in the stomach contents and found that D. gigas may present an energy optimization strategy during the cold season (austral winter), characterized by the intake of prey with a high energy content and rich in polyunsaturated fatty acids.…”

Section: Introductionmentioning

confidence: 99%

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Fatty Acid Profile of Jumbo Squid (Dosidicus gigas) off the Peruvian Exclusive Economic Zone: Revealing the Variability of Feeding Strategies

Zhao

Liu

et al. 2022

Fishes

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Jumbo squid Dosidicus gigas play a critical role in the marine ecosystems and are an important commercial species in the East Pacific. Generally, three size groups have been distinguished on the basis of the mantle length (ML) of an adult. Here, fatty acid (FA) analyses of muscle tissues were used to explore the feeding strategies of D. gigas off the Peruvian exclusive economic zone in terms of different size groups and sexes. There was no significant difference in fatty acid composition between the small- and medium-sized groups, whereas the large-sized group differed significantly from other groups. The higher content of C20:4n6 and (C18:2n6 + C18:3n3) indicates that the large-sized group may feed more frequently in nearshore and deep waters. Furthermore, the niches of the three size groups were consistent with the results of fatty acid composition, with the large-sized group occupying the widest trophic niche, followed by the medium-sized group and then the small-sized group. In addition, there was evidence of trophic niche overlap between the small and medium groups. In terms of sexual variability of the small and medium groups, the fatty acid composition significantly differed between females and males. In terms of sexual variation of the large group, the fatty acid composition between females and males was similar, indicating that similar feeding strategies may be adopted by them. This study revealed the variability of the feeding strategies of three size groups of D. gigas off the Peruvian exclusive economic zone.

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Section: Discussionsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Fatty Acid Profile of Jumbo Squid (Dosidicus gigas) off the Peruvian Exclusive Economic Zone: Revealing the Variability of Feeding Strategies

Zhao

Liu

et al. 2022

Fishes

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“…The pelagic zone in the Southeast Pacific has been found to be dominated by sardine and anchovy". The statement of reference [34] strengthened our above discussion on changes in swordfish catches.…”

Section: Spatial-temporal Variation Of the Catch Per Unit Of Effort Cpuesupporting

confidence: 56%

“…Environmental changes in the Humboldt Current affect the food web and, consequently, the abundance of the target fishery resource. In reference [34], it is said that: "Trophodynamics is defined as the transfer of energy from one ecosystem to another through the transfer and consumption of bioenergetic and nutritional constituents of organisms. The proposed pelagic food webs in the Southeast Pacific have shown that trophodynamics can be influenced by variability in climatic phenomena (e.g., ENSO, El Nino Southern Oscillation), as well as geographic location.…”

Section: Spatial-temporal Variation Of the Catch Per Unit Of Effort Cpuementioning

confidence: 99%

Analysis of the Swordfish Xiphias gladius Linnaeus, 1758 Catches by the Pelagic Longline Fleets in the Eastern Pacific Ocean

Félix-Salazar,

Marín-Enríquez,

Aragón-Noriega

et al. 2024

JMSE

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During the last 50 years, the increase in the efforts of the longline fleet in the Eastern Pacific Ocean (EPO) resulted in an increase in the capture of the swordfish Xiphias gladius. We analyzed a historical database of swordfish catches (1980–2020) reported by the industrial longline fleet to the Inter-American Tuna Tropical Commission (IATTC), which contains catch and effort data aggregated in monthly quadrants of 5° × 5° in the EPO. The swordfish catch reported by the international longline fleets was analyzed to evaluate the spatiotemporal variation of the catch and the different phases through which this important fishery has gone through. Different statistical models such as the Generalized Additive Mixed Model (GAMM) and the breaks for additive season and trend BFAST algorithm were used for the decomposition of the time series. Results indicated that the effort directed towards the swordfish increased in recent years and that the highest catches occurred by Peru. The adjusted GAMM explained 80% of the total temporal variation of the swordfish catch per unit effort CPUE and had a 90% prediction efficiency. The BFAST algorithm found three break points in the time series of the standardized CPUE, points associated with abrupt changes, thus defining four distinct periods, all of them statistically significant. According to the BFAST model, the current trend of swordfish CPUE is upward. It is recommended to take this finding with caution to obtain the sustainable exploitation of the swordfish fishery resource.

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“…Collectively, the mesopelagic community displays a wide array of feeding behaviours and occupies a variety of trophic guilds, including organisms feeding on bacteria, detritus, phytoplankton, zooplankton, micronekton, and nekton [4][5][6][7][8][9][10] . In turn, mesopelagic organisms are the primary food source for many open-ocean predators (e.g., sharks, marine mammals, seabirds and marine turtles), and commercially harvested fishes and squids [11][12][13][14][15][16] . Additionally, many mesopelagic animals undergo diel vertical migrations, rising towards the surface at night to feed and returning to deeper waters during the day 17,18 .…”

Section: Background and Summarymentioning

confidence: 99%

MesopTroph, a database of trophic parameters to study interactions in mesopelagic food webs

et al. 2022

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Mesopelagic organisms play a crucial role in marine food webs, channelling energy across the predator-prey network and connecting depth strata through their diel vertical migrations. The information available to assess mesopelagic feeding interactions and energy transfer has increased substantially in recent years, owing to the growing interest and research activity in the mesopelagic realm. However, such data have not been systematically collated and are difficult to access, hampering estimation of the contribution of mesopelagic organisms to marine ecosystems. Here we present MesopTroph, a georeferenced database of diet, trophic markers, and energy content of mesopelagic and other marine taxa compiled from 203 published and non-published sources. MesopTroph currently includes data on stomach contents, carbon and nitrogen stable isotopes, major and trace elements, energy density, fatty acids, trophic positions, and diet proportion estimates for 498 species/genera. MesopTroph will be expanded with new data emerging from ongoing studies. MesopTroph provides a unique tool to investigate trophic interactions and energy flow mediated by mesopelagic organisms, and to evaluate the ecosystem services of this community.

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Trophodynamics of the jumbo squid Dosidicus gigas during winter in the Southeast Pacific Ocean off the coast of Chile: Diet analyses and fatty acid profile

Cited by 8 publications

References 73 publications

Fatty Acid Profile of Jumbo Squid (Dosidicus gigas) off the Peruvian Exclusive Economic Zone: Revealing the Variability of Feeding Strategies

Fatty Acid Profile of Jumbo Squid (Dosidicus gigas) off the Peruvian Exclusive Economic Zone: Revealing the Variability of Feeding Strategies

Analysis of the Swordfish Xiphias gladius Linnaeus, 1758 Catches by the Pelagic Longline Fleets in the Eastern Pacific Ocean

MesopTroph, a database of trophic parameters to study interactions in mesopelagic food webs

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