Diet of capelin (Mallotus villosus) in the Eastern Canadian Arctic inferred from stomach contents and stable isotopes

Ogloff, Wesley R.; Ferguson, Steve; Tallman, Ross F.; Davoren, Gail K.

doi:10.1007/s00300-020-02707-1

Cited by 10 publications

(4 citation statements)

References 64 publications

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“…Bivalvia consume microalgae, organic matter, and detritus and therefore feed at trophic position 2, which is assigned as the baseline value (TP baseline ) for the shes ( blue mussels as the baseline prey species since δ 15 N values can vary between marine and freshwater systems (Hesslein et al 1991); therefore, using prey based on the known diet of the mobile consumers can account for that variation in δ 15 N between each connected system (δ 15 N consumer ). For harbour seals and ringed seals, we used the δ 15 N of capelin (14.71 ± 0.09‰) as the baseline, with the TP baseline = 3.69, since both predators are mainly piscivorous and consume capelin (Ogloff et al 2020;Thiemann et al 2008). For the δ 15 N of shes, a diet-tissue discrimination factor of 3.67‰ was used for muscle and 2.80‰ was used for liver (Caut et al 2009, Hobson et al 1996McCutchan et al 2003).…”

Section: Discussionmentioning

confidence: 99%

“…Greenland cod (mean trophic position 4.29) are considered a top predator within the shallow benthic food chains of Hudson Bay and consume sh such as capelin(Mikhail & Welch 1989;Mouritsen et al 2010). Ringed (mean trophic position 4.70) and harbour (mean trophic position 5.09) seals mainly consume shes, such as capelin and Arctic cod, and therefore occupy the top trophic position within this system(Ogloff et al 2020;Thiemann et al 2008;Yurkowski et al 2016). Harbour seals are central place foragers and typically forage in marine waters, but in this region, harbour seals haul out on rocks in the Churchill River estuary and some individuals also move upriver, presumably to forage on freshwater-derived resources(Bajzak et al 2013).…”

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confidence: 99%

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Trophic structure and a temporal shift in trophic diversity of mobile consumers in a subarctic estuary

George

Petersen²,

Roth

et al. 2023

Preprint

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Quantifying trophic relationships within and between species in terms of trophic position, ontogeny, and trophic diversity provides information on community-level structure and function. Little attention has been focused on examining the trophic structure and temporal changes of communities in freshwater-marine coupled systems in the subarctic and associated impacts of anthropogenic activity on trophic interactions. Therefore, the objective of this study was to quantify the trophic position of mobile consumers within the lower Churchill River area (Churchill, Manitoba, Canada), examine trophic position variation in relation to ontogeny, and measure the trophic diversity of a fish assemblage before (1993–1995) and after (2019–2020) the installation of the Churchill River weir in the late 1990s. We used stable isotopes (δ13C and δ15N) to quantify individual and population-level variation in trophic position of thirteen fish species and two seal species and also assessed six community-level metrics of a three fish species assemblage between time periods. Overall, species that mainly foraged on freshwater resources occupied lower trophic positions than species that mainly consumed marine resources. Trophic position increased with fish age only in cisco, fourhorn sculpin, Greenland cod, and northern pike. A temporal shift from a trophically diverse to a more trophically redundant fish assemblage occurred between 1993–1995 and 2019–2020. As a result, these predator species now play similar trophic roles. Information on the trophic structure of this sub-Arctic estuarine system over two time periods may help with understanding how anthropogenic activity may have influenced the trophic diversity of a fish assemblage inhabiting this system.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Trophic structure and a temporal shift in trophic diversity of mobile consumers in a subarctic estuary

George

Petersen²,

Roth

et al. 2023

Preprint

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“…Collection methods included rod and reel, ice fishing, and grabbing from shore (Pedro et al, 2017). Collections consisted mostly of adult fish (Table 1), except for capelin, which were likely juveniles because they were below the 130 to 200 mm maturity size for this species (Hop & Gjøsaeter, 2013; Ogloff et al, 2020). Fish and invertebrate samples were wrapped in solvent‐rinsed foil, stored at –20 °C temporarily, and then kept at –80 °C in the laboratory.…”

Section: Methodsmentioning

confidence: 99%

“…To test for trophic transfer of ∑SCCPs, we calculated BMFs as the ratio of the average lipid‐normalized concentration between predator and prey. Capelin and sand lance feed mostly on planktonic crustaceans, including amphipods (Danielsen et al, 2016; McNicholl et al, 2016; Ogloff et al, 2020), whereas Greenland cod feed mainly on forage fish, including capelin (Nielsen & Andersen, 2001). Adult ringed seal in western Hudson Bay feed primarily on sand lance during the open‐water season and on Arctic cod and capelin when sea ice is present (Chambellant et al, 2013).…”

Section: Methodsmentioning

confidence: 99%

Measurable Levels of Short‐Chain Chlorinated Paraffins in Western Hudson Bay Fishes but Limited Biomagnification from Fish to Ringed Seals

Facciola

Pedro

Houde

et al. 2021

Enviro Toxic and Chemistry

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We investigated short‐chain (C10–13) chlorinated paraffins (SCCP) in an Arctic marine food web. In zooplankton, fishes, and ringed seals from western Hudson Bay, Canada, SCCP concentrations ranged from 38.3 to 687 ng g–1 lipid weight. Monte Carlo–simulated trophic‐adjusted biomagnification factors of individual SCCP congeners ranged from 0.07 to 0.55 for small pelagic fishes to seals. Despite relatively high concentrations in fishes, biomagnification of SCCPs within this food web appears limited. Environ Toxicol Chem 2021;40:2990–2999. © 2021 SETAC

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Climate change and Arctic charr (Salvelinus alpinus) in North America: modelling possible changes in range with different climate scenarios and interspecific interactions

Bommersbach,

Grenier,

Gendron

et al. 2024

Ichthyol Res

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One of the greatest challenges for researchers today is understanding climate-change impacts on fish populations, particularly in vulnerable and understudied ecosystems such as the Canadian Arctic. Among other impacts, northern fishes will undergo thermal stress as atmospheric and sea surface temperatures are projected to rise globally. Models that consider how both environmental factors such as temperature and potential species interactions will impact population extirpation and species’ range contraction can help project the future distribution of a species in the face of a warming climate. Here, we investigate the climate-change impacts of rising temperatures and the potential northward distributional shift of brook charr (Salvelinus fontinalis) on Arctic charr (Salvelinus alpinus), Canada’s northernmost freshwater fish species. Specifically, we used a logistic regression model to establish baseline relationships between the current distribution of Arctic charr and the variables, degree-days (a key climate variable), geographical location, and brook charr occurrence. We developed the model applying the expected changes in degree-days to 2050 (25–50% increase from the average of 1976–2005) and 2080 (50–100% increase) while incorporating the historical distribution of Arctic charr to estimate the change in Arctic charr distribution over that time. We found that growing degree-days, longitude, latitude, and brook charr occurrences correctly classified 93% of Arctic charr historical occurrences in Canada. We estimate that in a high-carbon scenario, where degree-days are expected to increase by 50 to 100%, Arctic charr range is projected to decrease by 18% in Canada by 2051–2080 and decrease even further by 3% with the presence of brook charr. The Canadian high Arctic may provide refuge for Arctic charr, likely maintaining temperatures optimal for species persistence. Regardless, management that considers the climate stresses on Arctic charr populations will be important to preserve this highly valued resource that is pivotal for food security and traditional ways of life for northerners.

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Diet of capelin (Mallotus villosus) in the Eastern Canadian Arctic inferred from stomach contents and stable isotopes

Cited by 10 publications

References 64 publications

Trophic structure and a temporal shift in trophic diversity of mobile consumers in a subarctic estuary

Trophic structure and a temporal shift in trophic diversity of mobile consumers in a subarctic estuary

Measurable Levels of Short‐Chain Chlorinated Paraffins in Western Hudson Bay Fishes but Limited Biomagnification from Fish to Ringed Seals

Climate change and Arctic charr (Salvelinus alpinus) in North America: modelling possible changes in range with different climate scenarios and interspecific interactions

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