scholarly journals Predatory role of the commander squid Berryteuthis magister in the eastern Bering Sea: insights from stable isotopes and food habits

2010 ◽  
Vol 415 ◽  
pp. 91-108 ◽  
Author(s):  
ME Hunsicker ◽  
TE Essington ◽  
KY Aydin ◽  
B Ishida
Keyword(s):  
Stable Isotopes ◽  
Bering Sea ◽  
Food Habits ◽  
Eastern Bering Sea

scholarly journals Erratum to: The role of flatfishes in the organization and structure of the eastern Bering Sea ecosystem

2010 ◽  
Vol 76 (3) ◽  
pp. 435-435
Author(s):  
Sung Il Lee ◽  
Kerim Y. Aydin ◽  
Paul D. Spencer ◽  
Thomas K. Wilderbuer ◽  
Chang Ik Zhang
Keyword(s):  
Bering Sea ◽  
Eastern Bering Sea

Spatial Distribution, Energetic Status, and Food Habits of Eastern Bering Sea Age-0 Walleye Pollock

2009 ◽  
Vol 138 (3) ◽  
pp. 497-505 ◽  
Author(s):  
Jamal H. Moss ◽  
Edward V. Farley ◽  
Angela M. Feldmann ◽  
James N. Ianelli
Keyword(s):  
Spatial Distribution ◽  
Bering Sea ◽  
Food Habits ◽  
Walleye Pollock ◽  
Eastern Bering Sea

scholarly journals Examining the ecological role of jellyfish in the Eastern Bering Sea

2019 ◽  
Vol 77 (2) ◽  
pp. 791-802 ◽  
Author(s):  
James Ruzicka ◽  
Richard D Brodeur ◽  
Kristin Cieciel ◽  
Mary Beth Decker
Keyword(s):  
Bering Sea ◽  
Gulf Of Alaska ◽  
Forage Fish ◽  
Eastern Bering Sea ◽  
Gadus Macrocephalus ◽  
Northern California Current ◽  
Capelin Mallotus Villosus ◽  
Northern Pacific ◽  
Negative Impacts

Abstract Within the Eastern Bering Sea, the jellyfish Chrysaora melanaster has fluctuated widely over recent decades. We examined the role of C. melanaster as an ecosystem-structuring agent via application of ecosystem models representing inner-, mid-, and outer-shelf regions of comparable areal coverage. Chrysaora melanaster utilize 1% of total mid-shelf consumer production, or 1/4th the energy required by forage fish (capelin Mallotus villosus, Pacific herring Clupea pallasii, age-0 Pacific cod Gadus macrocephalus, age-0 walleye pollock Gadus chalcogrammus). Model simulations show the impacts of C. melanaster are broadly distributed across consumer groups with increasingly negative impacts with higher jellyfish biomass. Age-0 pollock represent the greater part of the forage fish biomass, and observed pollock biomass during low jellyfish years (2004–2007) was significantly greater than during high jellyfish years (2009–2014). However, sensitivity among consumer groups to observed jellyfish variability is small, within 5% of baseline (2004–2015) conditions. Estimates using similar models for the Coastal Gulf of Alaska (CGoA) and Northern California Current (NCC) suggest large differences in the role of scyphozoans among northern Pacific shelf ecosystems. Only 0.1% of total summer consumer production is required to support CGoA Chrysaora, while the coastal NCC population uses 19%.

Associations between flatfish abundance and surficial sediments in the eastern Bering Sea

2000 ◽  
Vol 57 (12) ◽  
pp. 2410-2419 ◽  
Author(s):  
Robert A McConnaughey ◽  
Keith R Smith
Keyword(s):  
Bering Sea ◽  
Food Habits ◽  
Prey Availability ◽  
Sediment Type ◽  
Trawl Survey ◽  
Surficial Sediments ◽  
Sediment Properties ◽  
Eastern Bering Sea ◽  
Yellowfin Sole ◽  
Hippoglossoides Elassodon

Spatially explicit relationships between pleuronectid flatfish abundance and surficial sediments in the eastern Bering Sea were investigated using published sediment descriptions and trawl survey data (1982-1994). Flatfish food habits were also examined because sediment properties are known to affect the distribution and abundance of benthic prey. For six species, we compared sediment textures in areas of highest and lowest abundance (kilograms per hectare). Sand predominated in areas of high yellowfin sole (Pleuronectes asper) (YFS) (p << 0.001) and rock sole (Lepidopsetta spp.) (RS) (p << 0.001) abundance, while mixed sand and mud was most common in areas of lowest abundance. In contrast, mixed sand and mud predominated in areas preferred by flathead sole (Hippoglossoides elassodon) (FHS) (p << 0.001), Alaska plaice (Pleuronectes quadrituberculatus) (AP) (p = 0.002), and arrowtooth flounder (Atheresthes stomias) (ATF) (p = 0.004), with more diverse substrates in low-density areas. Areas of high and low Greenland turbot (Reinhardtius hippoglossoides) (GT) (p = 0.845) abundance had similar sediment textures (primarily mixed sand and mud). Species with highly restricted diets (AP) or piscivores with weak sediment associations (GT, ATF) had relatively inflexible food habits, whereas YFS, RS, and FHS food habits varied considerably with sediment type. Our findings suggest that benthic-feeding pleuronectids prefer certain sediment textures because of adaptive differences in prey availability.

The role of flatfishes in the organization and structure of the eastern Bering Sea ecosystem

2010 ◽  
Vol 76 (3) ◽  
pp. 411-434 ◽  
Author(s):  
Sung Il Lee ◽  
Kerim Y. Aydin ◽  
Paul D. Spencer ◽  
Thomas K. Wilderbuer ◽  
Chang Ik Zhang
Keyword(s):  
Bering Sea ◽  
Eastern Bering Sea
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