Trophic niche partitioning of dominant North‐Atlantic krill species, Meganyctiphanes norvegica, Thysanoessa inermis, and T. raschii

Cabrol, Jory; Trombetta, Thomas; Amaudrut, S.; Aulanier, Florian; Sage, Richard D.; Tremblay, Réjean; Nozais, Christian; Starr, Michel; Plourde, Stéphane; Winkler, Gesche

doi:10.1002/lno.11027

Cited by 25 publications

(7 citation statements)

References 85 publications

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“…Regarding harvesting the mesopelagic species, seasonal differences should especially be assessed to facilitate a targeted harvest of the most suitable biomass for food and feed. As feeding patterns vary throughout the year [ 102 ], differences in the body, species, and size composition of the catches are likely.…”

Section: Resultsmentioning

confidence: 99%

Undesirables in Mesopelagic Species and Implications for Food and Feed Safety—Insights from Norwegian Fjords

Wiech

Silva

Meier

et al. 2020

Foods

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The increase in the global population demands more biomass from the ocean as future food and feed, and the mesopelagic species might contribute significantly. In the present study, we evaluated the food and feed safety of six of the most abundant mesopelagic species in Norwegian fjords. Trace elements (i.e., arsenic, cadmium, mercury, and lead), organic pollutants (i.e., dioxins, furans, dioxin-like polychlorinated biphenyls, and polybrominated flame-retardants), and potentially problematic lipid compounds (i.e., wax esters and erucic acid) were analyzed and compared to existing food and feed maximum levels and intake recommendations. Furthermore, contaminant loads in processed mesopelagic biomass (protein, oil, and fish meal) was estimated using worst-case scenarios to identify possible food and feed safety issues. While most undesirables were low considering European food legislation, we identified a few potential food safety issues regarding high levels of fluoride in Northern krill, wax esters in glacier lanternfish, and long-chain monounsaturated fatty acids in silvery lightfish. Our estimates in processed biomass indicated high levels of undesirable trace elements in the protein fraction, frequently exceeding the maximum levels for feed ingredients. However, in fish meal, almost no exceedances were seen. In the oil fraction, dioxins and furans were above the maximum levels, given for food and feed ingredients. The present study is crucial to enable an evaluation of the value of these species; however, more data is needed before proceeding with large-scale harvesting of mesopelagic biomass.

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Section: Resultsmentioning

confidence: 99%

Undesirables in Mesopelagic Species and Implications for Food and Feed Safety—Insights from Norwegian Fjords

Wiech

Silva

Meier

et al. 2020

Foods

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“…Tanais was positively correlated to very coarse sand (1 mm). Previous records of these arthropods showed higher abundance of Monoporeia amphipod, Thysanoessa krill and Tanais tanaid in estuary and intertidal zones where salinity gradient was present along the zone, and higher percentage of smaller-sized grain sediment such as mud and silt present in the area (Wiklund & Andersson, 2014;Cabrol et al, 2019;Pandiyarajan et al, 2020).…”

Section: Correlation Of Distribution and Diversity Of Benthic Macroinvertebrate Community With Environmental Parametermentioning

confidence: 85%

Distribution of Benthic Macroinvertebrates in Seafloor Northward of Pulau Indah, Klang

Kasihmuddin¹,

Cob²

2021

JST

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An assessment of community of benthic macroinvertebrates in waters northwards of Pulau Indah, Klang was made with the main objective to determine distribution and diversity of benthic macroinvertebrates as well as to establish possible correlation between the community’s distributions with environmental parameters. The sediments were obtained via Ponar Grab (0.023 m2 mouth area), followed by filtration (500 μm) and laboratory sorting in order to extract all specimens from sediments. The specimens were identified to the lowest taxonomic hierachy as possible. The physical parameters such as organic carbon (TOC) and grain size distributions were analysed. A total of 775 annelids, 15 arthropods, 12 echinoderms and 32 molluscs individuals were identified and recorded in six stations overall. Family Cirratulidae accounted to the highest numbers of the Annelids (n=358), whilst Cerithidae recorded as highest numbers of Molluscs. Station 5, 6 and 1 recorded the highest diversity index (H’=2.1845), evenness index (J’=0.6316) and richness index (Dmn=22.0454) respectively. Principal Component Analysis indicated sediment particle size as the major connector on all stations, with different station correlated to certain sizes of sediment particle. Pearson correlation analysis showed positive correlations between environmental parameters with eight benthic taxa in this study, with most correlations were on specific sediment particle size. As the study of benthic community is still inadequate in most of Malaysians waters, particularly in highly industrialised area such as waters in Port Klang, this study can serve as a starting point for any future studies concerning ecological disturbance affecting benthic community in Malaysian waters.

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“…In previous studies examining Walleye movement, females travelled greater distances than males to access cooler, deeper water [ 30 , 35 ]. Behaviours resulting in trophic niche separation have been documented in a variety of populations and communities [ 8 , 16 , 40 ] and one plausible explanation for female migration is that the sex benefiting most from resource acquisition (females in the case of Walleye) is the one that migrates to find those resources. Our findings indicate that hypotheses surrounding sex-biased differences in life history strategy should be considered in future work on POLS.…”

Section: Discussionmentioning

confidence: 99%

Alternative migratory strategies related to life history differences in the Walleye (Sander vitreus)

et al. 2022

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Background While Pace of Life Syndrome predicts behavioural differences between individuals with differential growth and survival, testing these predictions in nature is challenging due to difficulties with measuring individual behaviour in the field. However, recent advances in acoustic telemetry technology have facilitated measurements of individual behaviour at scales not previously possible in aquatic ecosystems. Methods Using a Walleye (Sander vitreus) population inhabiting Black Bay, Lake Superior, we examine whether life history characteristics differ between more and less mobile individuals as predicted by Pace of Life Syndrome. We tracked the movement of 192 individuals from 2016 to 2019 using an acoustic telemetry study, relating patterns in annual migratory behaviour to individual growth, and seasonal changes in optimal thermal-optical habitat. Results We observed two consistent movement patterns in our study population—migratory individuals left Black Bay during late summer to early fall before returning to the bay, whereas residents remained within the bay year-round. The average maximum length of migrant Walleye was 5.5 cm longer than residents, and the sex ratios of Walleye caught during fall surveys was increasingly female-biased towards the mouth of Black Bay, suggesting that a majority of migrants were females. Further, Walleye occupancy outside of Black Bay was positively associated with increasing thermal-optical habitat. Conclusions Walleye in Black Bay appear to conform to Pace of Life Syndrome, with migrant individuals gaining increased fitness through increased maximum size, which, given size-dependent fecundity in this species, likely results in greater reproductive success (via greater egg deposition vs. non-migrants). Further, apparent environmental (thermal) controls on migration suggest that migratory Walleye (more so than residents) may be more sensitive to changing environmental conditions (e.g., warming climate) than residents.

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Trophic niche partitioning of dominant North‐Atlantic krill species, Meganyctiphanes norvegica, Thysanoessa inermis, and T. raschii

Cited by 25 publications

References 85 publications

Undesirables in Mesopelagic Species and Implications for Food and Feed Safety—Insights from Norwegian Fjords

Undesirables in Mesopelagic Species and Implications for Food and Feed Safety—Insights from Norwegian Fjords

Distribution of Benthic Macroinvertebrates in Seafloor Northward of Pulau Indah, Klang

Alternative migratory strategies related to life history differences in the Walleye (Sander vitreus)

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