Greenland halibut diet in the Northwest Atlantic from 1978 to 2003 as an indicator of ecosystem change

Dwyer, Karen S.; Buren, Alejandro D.; Koen‐Alonso, Mariano

doi:10.1016/j.seares.2010.04.006

Cited by 41 publications

(47 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Predation pressure affects the population dynamics of prey fishes and may have cascading effects on lower trophic niches (Baum & Worm 2009, Eriksson et al 2009). Additionally, the diet of predators can be an indicator of ecosystem change (Link et al 2002, Dwyer et al 2010. Not only the impacts of predation on prey populations but also the responses of predators to changes in prey densities are key subjects for understanding ecosystem functions (Moustahfid et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus

Tomiyama¹,

Kurita²

2011

Aquat. Biol.

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus

Tomiyama¹,

Kurita²

2011

Aquat. Biol.

View full text Add to dashboard Cite

“…Fish is expected to be high in arsenobetaine compared to other species like molluscs and shellfish which can have 25Á45% of potentially toxic and bioccumulating arsenic compounds like arsenosugars (Li et al 2003;Feldman et al 2011). Greenland halibut consume a wide variety of prey, which is assumed to reflect prey availability, and depth, area and size of the Greenland halibut has been found as significant when explaining differences in diet composition (Dwyer et al 2010). A significant correlation between fish weight and arsenic content in muscle from Greenland Halibut captured at West Greenland has also been reported previously (Bohn 1975).…”

mentioning

confidence: 99%

Concentrations of mercury, arsenic, cadmium and lead in Greenland halibut (Reinhardtius hippoglossoides) caught off the coast of northern Norway

Julshamn¹,

Frantzen²,

Valdersnes³

et al. 2011

Marine Biology Research

View full text Add to dashboard Cite

In January 2006 it was reported from Russia that Greenland halibut (Reinhardtius hippoglossoides) caught in the Barents Sea had shown mercury levels exceeding the European Union's upper limit of 0.5 mg/kg wet weight (ww) for this species. These findings were confirmed in a small study from the same area. To gain more knowledge, a larger study was initiated to investigate the levels of mercury in Greenland halibut caught off the coast of northern Norway. A total of 320 Greenland halibut were caught in this area in May 2006. Individual fish were filleted and analysed for mercury, arsenic, cadmium and lead. Round weight of the fish varied between 1.1 and 8.1 kg. Fish age varied between 12 and 29 years. The highest mercury concentration measured in muscle tissue was 1.1 mg/kg ww. The highest concentrations were found in female fish. Mercury concentration was positively correlated with fish size and negatively correlated with fat content. Fish captured in the easternmost part of the investigated area had significantly lower mercury concentrations than those caught further west. Fish captured at one of the positions had particularly high average mercury concentrations, 0.52 mg/kg ww, possibly due to a combination of large size, low fat content and different prey availability. The concentrations of arsenic, cadmium and lead in the fillet samples of Greenland halibut ranged from 1.5 to 32 mg/kg ww, B0.001 to 0.02 mg/kg ww and B0.01 to 0.05 mg/kg ww, respectively. Concentrations of arsenic and mercury were positively correlated when all data were included.

show abstract

“…Cannibalism has been observed in other stocks (Rodriguez‐Marin et al. , 1995; Jørgensen, 1997b; Woll and Gundersen, 2004; Dwyer et al. , 2010).…”

Section: Discussionmentioning

confidence: 88%

“…As mentioned, the different spatial distributions of juveniles and adults at higher abundance levels should limit interactions between fish of different sizes. Moreover, Greenland halibut caught in the EGSL rarely exceed 56 cm in length (DFO, 2006) and cannibalism usually occurs in fish larger than 69 cm (Dwyer et al. , 2010).…”

Section: Discussionmentioning

confidence: 99%

Spatial distribution of Greenland halibut Reinhardtius hippoglossoides in relation to abundance and hypoxia in the estuary and Gulf of St. Lawrence

Youcef

Lambert

Audet

2012

Fisheries Oceanography

View full text Add to dashboard Cite

Annual bottom‐trawl surveys (1990–2010) were used to examine associations between environmental conditions, spatial distribution, and size‐specific abundance of Greenland halibut Reinhardtius hippoglossoides in the estuary and Gulf of St. Lawrence (EGSL), and to test the influence of hypoxic conditions on habitat selection. Size classes representing juvenile, immature and adult fish were used for the analyses. The highest concentrations of fish were found in the St. Lawrence estuary at both high and low levels of stock abundance. The areas occupied by 50, 75, and 95% of juvenile fish expanded with higher population abundance. However, contrary to our predictions, densities in marginal habitats did not increase at a higher rate than in optimal habitats. Fish longer than 32 cm were distributed over a broader area than juvenile fish. Their abundance explained a limited proportion of the variability in spatial distribution. The spatial dynamics of Greenland halibut in the EGSL is best described by a proportional density model where the rate of increase in local density is associated with population abundance. Habitats selected by Greenland halibut were characterized by low dissolved oxygen (DO) levels. The strong association between high fish densities and low DO concentrations indicates a high tolerance of Greenland halibut to hypoxia. It also indicates that negative effects, if present, could be compensated by other factors such as food availability and/or refuge from predation. The results of this study also clearly define the St. Lawrence estuary as the major nursery area for the EGSL population.

show abstract

Greenland halibut diet in the Northwest Atlantic from 1978 to 2003 as an indicator of ecosystem change

Cited by 41 publications

References 35 publications

Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus

Seasonal and spatial variations in prey utilization and condition of a piscivorous flatfish Paralichthys olivaceus

Concentrations of mercury, arsenic, cadmium and lead in Greenland halibut (Reinhardtius hippoglossoides) caught off the coast of northern Norway

Spatial distribution of Greenland halibut Reinhardtius hippoglossoides in relation to abundance and hypoxia in the estuary and Gulf of St. Lawrence

Contact Info

Product

Resources

About