Migration patterns of Greenland halibut in the North Atlantic revealed by a compiled mark–recapture dataset

Vihtakari, Mikko; Elvarsson, Bjarki Þór; Treble, Margaret A.; Nogueira, Adriana; Hedges, Kevin J.; Hussey, Nigel E.; Wheeland, Laura J.; Roy, Denis; Ofstad, Lise Helen; Hallfredsson, Elvar H.; Barkley, Amanda N.; Estévez-Barcia, Daniel; Nygaard, Rasmus; Healey, Brian; Steingrund, Pétur; Johansen, Torild; Albert, Ole Thomas; Boje, Jesper

doi:10.1093/icesjms/fsac127

Cited by 7 publications

(18 citation statements)

References 71 publications

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“…Describes two major populations in the North Atlantic, merging the West Greenlandic and Canadian eastern Arctic, Iceland, and Southeast Greenland regions in a unique population separated from the Norwegian slope. Although this hypothesis is less supported than the previous one, tagging studies also found migrations between NWAS and WNS (Boje, 2002;Vihtakari et al, 2022). For each hypothesized population, equal (all populations follow the same growth rate) and unique (separated growth rate across populations) population growth rates (u) were tested.…”

Section: Tested Modelsmentioning

confidence: 97%

“…North Atlantic Oscillation (NAO) index: The NAO is a cyclical climate oscillation, measured as the difference in atmospheric pressure between the Icelandic low and Azores high (Figure 3). This index has been used by Albert and Høines (2003) Survey index maps were created using the ggOceanMaps package (Vihtakari, 2022), with land polygons from Natural Earth Data (https://www.natur alear thdata.com/) and depth polygons from the ETOPO 1 arc-minute bathymetry grid (Amante & Eakins, 2009).…”

Section: Covariatesmentioning

confidence: 99%

“…Some studies also include the Southeast Greenland portion as well. Therefore, the North Atlantic may consist of two major offshore populations, with a boundary somewhere between Iceland and Southeast of Greenland (Vihtakari et al, 2022). The recovery of a substantial proportion of juveniles tagged in Svalbard nursery area and recovered in the West Nordic area suggested that NEAS and WNS should be treated as one population (Albert & Vollen, 2015).…”

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confidence: 99%

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Using multivariate autoregressive state‐space models to examine stock structure of Greenland halibut in the North Atlantic

Plaza-Úbeda

Nogueira

Tolimieri

et al. 2023

Fisheries Management Eco

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Accurate information on population structure is essential for effective fisheries management. Greenland halibut (Reinhardtius hippoglossoides) in the North Atlantic is managed as four separate offshore stocks. We use Multivariate Autoregressive State‐Space (MARSS) models to assess population structure by means of abundance and biomass trends in four regions (Norwegian Sea, Iceland, Southeast Greenland, and Northwest Atlantic) where three offshore stocks are recognized: (1) Baffin Bay–Davis Strait (Northwest Atlantic stock), (2) Southeast Greenland and Iceland (West Nordic stock (WNS)), and (3) the Barents and Norwegian Seas (Northeast Arctic stock). We formulated model alternatives, using bottom trawl survey data from each region for 1996–2019, to evaluate support for different population structures. Abundance and biomass observations from each region were linked to growth rate parameters in MARSS models and the impact of climate (North Atlantic Oscillation Index) and fishing (commercial catches) on stock dynamics was investigated. Top models identified the Northwest Atlantic as an independent population. Best‐fit models treated Greenland halibut in the WNS as two independent populations (east and west), with potential connections between eastern Iceland and the western Barents Sea. These results suggest a mismatch between current stock perception and management boundaries in the Northeast Atlantic.

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Section: Tested Modelsmentioning

confidence: 97%

Section: Covariatesmentioning

confidence: 99%

mentioning

confidence: 99%

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Using multivariate autoregressive state‐space models to examine stock structure of Greenland halibut in the North Atlantic

Plaza-Úbeda

Nogueira

Tolimieri

et al. 2023

Fisheries Management Eco

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“…data) the higher relative read counts were most likely not caused by spawning events, but rather by migration of Greenland halibut into the southern branch. Indeed, the entire stock of Greenland halibut in the Icefjord and other coastal Greenlandic areas results from the immigration of larvae and juveniles from offshore spawning sites in the Davis Strait (Vihtakari et al 2022). In many Greenland fjords, the large adult fishes are thought to be non-spawning expatriates, 'trapped' in the fjords due to the shallow fjord entrance sills (Boje 1994).…”

Section: Distribution Of Species; Spatial and Temporal Differencesmentioning

confidence: 99%

Environmental DNA metabarcoding reveals seasonal and spatial variation in the vertebrate fauna of Ilulissat Icefjord, Greenland

Schiøtt

Jensen

Sigsgaard

et al. 2023

Mar. Ecol. Prog. Ser.

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Ilulissat Icefjord in Greenland is experiencing the effects of climate change, with the Sermeq Kujalleq glacier being one of the fastest-moving and most productive ice streams in Greenland. This is likely affecting the distribution of species in the fjord, including those important to local fisheries. Due to heavy ice conditions, few studies on environmental and ecological conditions exist from the fjord. However, new techniques such as environmental DNA (eDNA) metabarcoding now allow deeper insight into the fjord system. Here, we combine local ecological knowledge with data on hydrographic conditions, stable isotopes (δ18O), and eDNA metabarcoding to investigate the spatial and seasonal distribution of marine fish and mammals inside Ilulissat Icefjord. Our eDNA results support local observations that Arctic char migrate to the southern fjord during summer, harp seals forage in large herds in the fjord system, polar cod is the dominant prey fish in the area, and Greenland shark likely does not reside in the fjord system. Lower predation pressure in the Icefjord, due to the absence of Greenland shark and polar bears as well as limited fishing/hunting, is presumably one of the reasons why ringed seals and Greenland halibut are larger in the Icefjord. Furthermore, our results indicate that in summer, the southern branch of the fjord system has a more diverse community of vertebrates and different water masses than the northern branch and main fjord, indicating a time lag between inflows to the different branches of the fjord system. Our approach highlights the value of combining local ecological knowledge with scientific research and represents a potential starting point for monitoring biological responses in Ilulissat Icefjord associated with climate-induced changes.

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“…Greenland halibut is an important commercial flatfish species in the Arctic that is highly mobile. See Hussey et al (2017); Barkley et al (2018), and Vihtakari et al (2022) for studies of their inter‐regional migration behavior. Age determination is problematic for Greenland halibut; therefore, we focus on mature‐at‐length data.…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal modeling of mature‐at‐length data using a sliding window approach

et al. 2022

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Assessing maturity status of fish and invertebrate species is important for understanding population dynamics with results (e.g., estimates of reproductive potential) often used to inform fisheries management strategies (e.g., the setting of minimum legal size requirements for fishing). Maturity rates may vary substantially across a population's range, as well as between years. In addition, maturity data are typically obtained from fisheries-independent surveys that may be incomplete (or missing) from year to year. Here we propose a spatial generalized linear mixed model (GLMM) framework for maturity data that includes spatially correlated random effects to address variations in space, and a sliding window approach to deal with unbalanced maturity data in both space and time. We demonstrate, with both real data and a simulation study, that this combined approach results in unbiased estimates of important growth parameters. Results of using our spatial GLMM framework with Greenland halibut (Rheinhardtius hippoglossoides) mature-at-length data from surveys of the eastern Canadian Arctic show that females mature at a much larger size than do males. The length at which 50% of the stock is mature (L 50 ) is found to be higher in Baffin Bay compared to Davis Strait, and a declining trend in the L 50 in recent years is revealed for both sexes. Our proposed methodology extends far beyond our current application in being useful for analyzing unbalanced spatiotemporal data from an array of diverse scientific fields.

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Migration patterns of Greenland halibut in the North Atlantic revealed by a compiled mark–recapture dataset

Cited by 7 publications

References 71 publications

Using multivariate autoregressive state‐space models to examine stock structure of Greenland halibut in the North Atlantic

Using multivariate autoregressive state‐space models to examine stock structure of Greenland halibut in the North Atlantic

Environmental DNA metabarcoding reveals seasonal and spatial variation in the vertebrate fauna of Ilulissat Icefjord, Greenland

Spatiotemporal modeling of mature‐at‐length data using a sliding window approach

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