Juvenile salmon presence effects on the diet of native Puye Galaxias maculatus in lakes and estuaries of Patagonian fjords

Pérez, Stefanía; Manosalva, Aliro; Colin, Nicole; González, José Javier Elizalde; Habit, Evelyn; Ruzzante, Daniel E.; Górski, Konrad

doi:10.1007/s10530-021-02628-y

Cited by 7 publications

(2 citation statements)

References 59 publications

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“…Debris including the uncountable prey items, plants and sand particles occurred in all but two of the gastrointestinal tracts; one was empty and the other was without debris. Previous studies demonstrated that dietary composition of drift-feeding salmonid fishes was mainly pollution-intolerant aquatic insects [31,[60][61][62]. However, in this study, both morphological observation and GITeDNA metabarcoding revealed a certain proportion of pollution-tolerant aquatic prey in the diet of Masu salmon belonging to the families Culicidae, Chironomidae and Tipulidae [63][64][65], which might be a warning signal for habitat pollution.…”

Section: Diet Composition and Diversity Of Masu Salmoncontrasting

confidence: 60%

Diet Diversity of the Fluviatile Masu Salmon, Oncorhynchus masou (Brevoort 1856) Revealed via Gastrointestinal Environmental DNA Metabarcoding and Morphological Identification of Contents

Li,

Yin,

Wan

et al. 2024

Biology

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Masu salmon, Oncorhynchus masou (Brevoort 1856), a commercially important fish species endemic to the North Pacific Ocean, attained national second-level protected animal status in China in 2021. Despite this recognition, knowledge about the trophic ecology of this fish remains limited. This study investigated the diet diversity of fluviatile Masu salmon in the Mijiang River, China, utilizing the gastrointestinal tract environmental DNA (GITeDNA) metabarcoding and morphological identification. The results revealed a diverse prey composition, ranging from terrestrial and aquatic invertebrates to small fishes. The fluviatile Masu salmon in general consumed noteworthily more aquatic prey than terrestrial prey. There were much more prey taxa and a higher diet diversity detected by GITeDNA metabarcoding than by morphological identification. GITeDNA metabarcoding showed that larger and older Masu salmon consumed significantly more terrestrial insects than aquatic prey species did, with 7366 verses 5012 sequences in the group of ≥20 cm, 9098 verses 4743 sequences in the group of ≥100 g and 11,540 verses 729 sequences in the group of age 3+. GITeDNA metabarcoding also showed size- and age-related diet diversity, indicating that the dietary niche breadth and trophic diversity of larger and older Masu salmon increased with food resources expanding to more terrestrial prey. Terrestrial invertebrates of riparian habitats play a vital role in the diet of fluviatile Masu salmon, especially larger individuals, highlighting their importance in connecting aquatic and terrestrial food webs. Conservation plans should prioritize the protection and restoration of riparian habitats. This study advocates the combined use of GITeDNA metabarcoding and morphological observation for a comprehensive understanding of fish diet diversity.

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Section: Diet Composition and Diversity Of Masu Salmoncontrasting

confidence: 60%

Diet Diversity of the Fluviatile Masu Salmon, Oncorhynchus masou (Brevoort 1856) Revealed via Gastrointestinal Environmental DNA Metabarcoding and Morphological Identification of Contents

Li,

Yin,

Wan

et al. 2024

Biology

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“…These results may indicate that, in enclosed systems, the Chinook salmon rely more on a piscivorous diet, which could negatively impact the native wild fish species in these waters. In general, salmonid invasions are considered a serious threat to the freshwater ecosystems of Patagonia , Habit et al 2012, Pérez et al 2021. In this study, it was further found that the stomachs of the returning adult Chinook salmon in both rivers (Petrohué and Puelo) were devoid of food.…”

Section: Feeding Patternsmentioning

confidence: 57%

The cohabitation of Chinook salmon (Oncorhynchus tshawytscha) with trout populations in two important recreational fishing rivers in southern Chile

Bravo

Whelan²,

Ponce

et al. 2022

Lat. Am. J. Aquat. Res.

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A study was carried out on two important recreational fishing rivers in southern Chile, the Petrohué and the Puelo, to assess the population structure of the salmonid species inhabiting both rivers. Five river sectors were surveyed on four dates between April 2016 and February 2017. In the Petrohué River, 2400 fish were sampled (42.9% rainbow trout Oncorhynchus mykiss; 23.8% brown trout Salmo trutta, and 33.3% Chinook salmon Oncorhynchus tshawytscha), while in the Puelo River, 1972 fish were examined (51.6% rainbow trout; 30.4% brown trout and 18% Chinook salmon). Fry and fingerling stages accounted for the highest proportion of fish collected by electrofishing. In the Petrohué and Puelo rivers, rainbow trout fry and fingerlings represented 96.3 and 99.2% of the fish sampled, respectively; 96.8 and 97.1% in the case of brown trout, while for Chinook salmon, parr and pre-smolts represented 97% of the fish examined in the Petrohué River and 98.3% in the Puelo River. Rainbow and brown trout shared the same habitats and food items in both rivers, and the two oldest trout recorded 5+ and 6+years. Parr and pre-smolt Chinook salmon were present mainly in the winter and spring seasons and were aged 1+ and 2+, respectively. There were no differences in the food items recorded from the juvenile fish sampled in both rivers. The mature, returning adult Chinook salmon aged between 1.5+ and 1.6+ years were devoid of food and were recorded over the autumn season with the highest abundance in the Petrohué River. The study did not identify any adverse competition or negative interactions among the three main salmonid species sharing the same habitat.

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Detection of juvenile coho salmon (Oncorhynchus kisutch) indicates widespread successful reproduction and different life-history strategies in the extreme south of Patagonia

Chalde,

Nardi,

Reibel

et al. 2023

Biol Invasions

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Juvenile salmon presence effects on the diet of native Puye Galaxias maculatus in lakes and estuaries of Patagonian fjords

Cited by 7 publications

References 59 publications

Diet Diversity of the Fluviatile Masu Salmon, Oncorhynchus masou (Brevoort 1856) Revealed via Gastrointestinal Environmental DNA Metabarcoding and Morphological Identification of Contents

Diet Diversity of the Fluviatile Masu Salmon, Oncorhynchus masou (Brevoort 1856) Revealed via Gastrointestinal Environmental DNA Metabarcoding and Morphological Identification of Contents

The cohabitation of Chinook salmon (Oncorhynchus tshawytscha) with trout populations in two important recreational fishing rivers in southern Chile

Detection of juvenile coho salmon (Oncorhynchus kisutch) indicates widespread successful reproduction and different life-history strategies in the extreme south of Patagonia

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