Ontogenetic niche changes in haddock Melanogrammus aeglefinus reflected by stable isotope signatures, δ13C and δ15N

Ramsvatn, S.; Pedersen, Torstein

doi:10.3354/meps09604

Cited by 6 publications

(7 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Albert (1995) observed that small haddock fed also on pelagic prey in the North Sea off southwestern Norway. Ramsvatn and Pedersen (2012) also found a significant difference in δ 13 C and δ 15 N compositions between small and large haddock in the Norwegian Sea off northern Norway.…”

Section: Cod and Haddock: Strong Dependence On The Benthic Trophic Pamentioning

confidence: 72%

“…In the deep zone, however, small individual's trophic position was clearly lower than the large one and showed no SEAc overlap, indicating a probable ontogenetic shift. Ramsvatn and Pedersen (2012) found a gradual change in cod's isotopic composition with size. Similarly, Du Buit (1995) found an increase in fish items in the diet of cod as cod size increased in the Celtic Sea, as did Hüssy et al (2016) for the North Sea.…”

Section: Cod and Haddock: Strong Dependence On The Benthic Trophic Pamentioning

confidence: 95%

See 1 more Smart Citation

Trophic ecology of large gadiforms in the food web of a continental shelf ecosystem

Day

Kopp

Robert

et al. 2019

Progress in Oceanography

View full text Add to dashboard Cite

Human activities affect continental shelves, especially due to the harvest of living marine resources. Understanding their functioning and dynamics has become a growing concern in recent decades, especially through use of trophic modelling approaches. Studying the feeding ecology of key component species also improves this understanding by providing accurate information on trophic processes, particularly the dependence on trophic pathways. This study focuses on the trophic ecology of four large gadiforms (cod, haddock, whiting and hake) found on the continental shelf of the Celtic Sea. The study combines information on recently ingested prey (gut content analysis) and a more integrated indicator of food sources (stable isotope analysis). Two size classes of each species were considered (small and large-split around 20 cm for haddock, whiting and hake and 60 cm for cod), as were shallow and deep zones. The four gadiforms show distinct feeding niches and strategies, which limit interspecific competition. Cod and haddock relied mainly on the benthic trophic pathway but differed in favouring piscivory and invertivory, respectively. Hake fed mainly on the pelagic trophic pathway, while whiting seemed to feed on both pathways. Ontogenetic shifts from invertivory to piscivory were observed for whiting in both zones and for hake and cod in the deep zone. An unexpected shift from the pelagic to the benthic trophic pathway was observed from small to large haddock in the deep zone. Taking into account the descriptions of diets made in adjacent ecosystems throughout the year, the four species show trophic plasticity towards one of the trophic pathways or the other. Differences between the shallow and deep zones were related to benthic and pelagic prey characteristics, which themselves are driven by the sedimentary and hydrological context, especially thermal stratification. Highlights ► Cod and haddock relied mainly on the benthic trophic pathway. ► Hake relied mainly on the pelagic trophic pathway. ► Whiting feed on both pathways. ► Shifts with size for whiting in both zones and for hake and cod in the deepest one. Keywords : Celtic Sea feeding gut content stable isotopes ontogeny habitat comparison Highlights  Cod and haddock relied mainly on the benthic trophic pathway  Hake relied mainly on the pelagic trophic pathway  Whiting feed on both pathways  Shifts with size for whiting in both zones and for hake and cod in the deepest one

show abstract

Section: Cod and Haddock: Strong Dependence On The Benthic Trophic Pamentioning

confidence: 72%

Section: Cod and Haddock: Strong Dependence On The Benthic Trophic Pamentioning

confidence: 95%

Trophic ecology of large gadiforms in the food web of a continental shelf ecosystem

Day

Kopp

Robert

et al. 2019

Progress in Oceanography

View full text Add to dashboard Cite

show abstract

“…2 cm 3 ) were dissected from the left dorsal side of the fish and worked up according to standard procedures before each sample was placed in a drying oven for 48 h at 62°C (Ramsvatn and Pedersen 2012). The muscle samples (A. atlanticus, n = 18; M. scorpius, n = 8; L. decagonus, n = 9) were submitted for analysis (without lipid correction) by the Stable Isotopes in Nature Laboratory (SINLAB), Rivers Institute, Canada.…”

Section: Stable Isotope Analysismentioning

confidence: 99%

“…TL estimates for each species were determined based on calculations of the dietary enrichment in isotopic nitrogen (d 15 N) up the food chain (Peterson and Fry 1987;Ramsvatn and Pedersen 2012).…”

Section: Stable Isotope Analysismentioning

confidence: 99%

“…Previous research on trophic interactions was heavily skewed towards commercially important species and single-species predator-prey relationships. However, in modern research, all species are recognized within an ecosystem, and the objectives have shifted from speciesbased to ecosystem-based research and management (Byrkjedal and Høines 2007;Ramsvatn and Pedersen 2012).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Food resource partitioning between three sympatric fish species in Porsangerfjord, Norway

2014

View full text Add to dashboard Cite

Understanding predator-prey relationships and resource overlap between sympatric species is fundamental for enhanced scientific knowledge and management. This study compared the trophic ecology of three small demersal fishes (Artediellus atlanticus, Myoxocephalus scorpius, and Leptagonus decagonus) using stomach data and stable isotope analyses. All fish were sampled during 2009-2011 from the inner basin of Porsangerfjord (70°N, 25°E) in northern Norway. The dominant prey found in A. atlanticus was polychaetes, while M. scorpius had fed on juvenile fishes and decapods, and L. decagonus had mainly consumed copepods. The trophic positions of the fishes overlapped extensively (A. atlanticus: trophic level (TL) 3.4-4.2; M. scorpius: TL 3.6-4.3; L. decagonus: TL 3.7-4.6). Although the nutritional origin (d 13 C) of the prey varied among the fishes, A. atlanticus and M. scorpius were associated with benthic prey (d 13 C -18.64 to -17.28 and d 13 C -18.67 to -17.04, respectively), whereas L. decagonus was associated with pelagic prey (d 13 C -19.95 to -18.74). The combined results of the stomach data and stable isotope analyses further suggested that M. scorpius had a dietary preference for benthic-pelagic prey. Thus, the fish diets were considered to be species specific, and the study indicated that the three species utilize different prey groups within the food web of the Porsangerfjord ecosystem.

show abstract

Deciphering the structure of the West Greenland marine food web using stable isotopes (δ13C, δ15N)

et al. 2016

View full text Add to dashboard Cite

Ontogenetic niche changes in haddock Melanogrammus aeglefinus reflected by stable isotope signatures, δ13C and δ15N

Cited by 6 publications

References 57 publications

Trophic ecology of large gadiforms in the food web of a continental shelf ecosystem

Trophic ecology of large gadiforms in the food web of a continental shelf ecosystem

Food resource partitioning between three sympatric fish species in Porsangerfjord, Norway

Deciphering the structure of the West Greenland marine food web using stable isotopes (δ13C, δ15N)

Contact Info

Product

Resources

About