On the trophic role of pelagic fishes and fishery landings shifts in the South Brazil Bight

OLHER, Júlia Petroski; Gasalla, Maria A.

doi:10.1590/2675-2824071.22104jpo

Cited by 2 publications

(2 citation statements)

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“…Specifically, they fed on other carangids and clupeiformes as found in some previous trophic analyses of these species (Carvalho & Soares, 1997;Sazima, 1998). Consumption of other dietary items from the pelagic layer has also been observed in other studies on the use of habitat by S. setapinnis (Cervigón et al, 1992;Olher & Gasalla, 2023) and O. saliens (Cervigón, 1993;Pichler et al, 2017). In contrast, the third species with a superior opening mouth, C. chrysurus, shows a more generalist diet (including predominance of the generally benthic associated taxa Aluterus monoceros and Porichthys porosissimus) as also observed in other studies (Cervigón, 1966;Cunha et al, 2000;Menezes & Figueiredo, 1980).…”

Section: Re Sults and Discussionsupporting

confidence: 59%

“…The failure to identify more benthic-limited and non-fish prey items in the diet may reflect true consumption preferences for fish as prey, or amplification bias, or a lack of identification of invertebrate taxa because of limited reference sequences for the region's fauna. S. setapinnis has recently been described to be piscivorous but with zooplankton complementing the diet while C. chrysurus were found to consume copepods and larval crustaceans including luciferids (Olher & Gasalla, 2023). The luciferid shrimp…”

Section: Re Sults and Discussionmentioning

confidence: 99%

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Molecular analyses of carangid fish diets reveal inter‐predation, dietary overlap, and the importance of early life stages in trophic ecology

Rosa,

Gasalla,

de Queiroz

et al. 2024

Ecology and Evolution

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Carangid fishes are commercially important in fisheries and aquaculture. They are distributed worldwide in both tropical and subtropical marine ecosystems. Their role in food webs is often unclear since their diet cannot be easily identified by traditional gut content analysis. They are suspected to prey on pelagic and benthic species, with clupeiform fishes being important dietary items for some species, though it is unknown whether carangids share food resources or show trophic segregation. Here, we used metabarcoding to overcome traditional challenges of taxonomic approaches to analyze the diet of seven carangid species caught as bycatch in the Brazilian southwest Atlantic sardine fishery. Stomach contents were processed from the following species: Caranx crysos, Caranx latus, Chloroscombrus chrysurus, Hemicaranx amblyrhynchus, Oligoplites saliens, Selene setapinnis, and Trachinotus carolinus. Identified diets were dominated by teleost fishes. The C. latus diet was the most distinct among the seven species, preferentially consuming Engraulis anchoita, but H. amblyrhynchus, O. saliens, and S. setapinnis also showed a trend of predominantly consuming small pelagic fishes. Finally, we found evidence of inter‐predation in carangids, especially strong between S. setapinnis and C. crysos, suggesting that consumption of early life stages may result in indirect competition through reduced recruitment in these fishes. These findings provide unprecedented insights into the biodiversity in marine ecosystems, especially the poorly known diet of carangid fishes.

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Section: Re Sults and Discussionsupporting

confidence: 59%

Section: Re Sults and Discussionmentioning

confidence: 99%

Molecular analyses of carangid fish diets reveal inter‐predation, dietary overlap, and the importance of early life stages in trophic ecology

Rosa,

Gasalla,

de Queiroz

et al. 2024

Ecology and Evolution

View full text Add to dashboard Cite

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Dietary metabarcoding of keystone sardine species reveals the importance of their ichthyoplankton prey in food webs of the Southern Brazilian Bight fisheries

de Queiroz,

Gasalla,

Laux

et al. 2024

Fisheries Oceanography

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Clupeiform fishes are ecologically and economically important species contributing to industrial and artisanal fisheries worldwide. They represent key links in food webs, influencing the dynamic between trophic levels. The dietary interactions of these species are poorly studied in many regions, yet essential for fisheries management. To elucidate the role of these species in food webs of the Southern Brazilian Bight pelagic fisheries, we used metabarcoding analysis of fish stomach contents of Clupeiformes and possible predators. Onboard sampling from March to September 2016 allowed for processing of 87 stomach samples representing 31 species (including 12 samples representing three species of Clupeiformes). Links between trophic levels showed the predominance of Sardinella brasiliensis and Engraulis anchoita as important dietary items of a large range of fishes (28 species belonging to 18 families) and representing the majority of the total prey read abundance assigned to clupeiform fishes (~46% and ~32%, respectively). Opisthonema oglinum contributed to the diet of 16 species in 13 families and ~18% of total read abundance of clupeiform fishes as prey. The appearance of multiple clupeiform taxa in the diet of predators that are not commonly associated with pelagic prey indicates that ecosystem‐based fisheries management should not be separated between pelagic and demersal fisheries. The diet of Clupeiformes revealed an unexpectedly large diversity of fish species and a low proportion of invertebrates (<5% of clupeiform prey reads). This was likely due to a combination of both a limitation of the metabarcoding method (primer bias and low success of invertebrate taxonomic identification) as well as a contribution of early life stages (ichthyoplankton) to the diet of these fishes. The potential role of clupeiform fish populations as a constraint to the recruitment from the ichthyoplanktonic phase of other ecologically or commercially important fishes should be considered as an important direction for future studies.

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On the trophic role of pelagic fishes and fishery landings shifts in the South Brazil Bight

Cited by 2 publications

References 49 publications

Molecular analyses of carangid fish diets reveal inter‐predation, dietary overlap, and the importance of early life stages in trophic ecology

Molecular analyses of carangid fish diets reveal inter‐predation, dietary overlap, and the importance of early life stages in trophic ecology

Dietary metabarcoding of keystone sardine species reveals the importance of their ichthyoplankton prey in food webs of the Southern Brazilian Bight fisheries

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