Nutrients and primary production along the eastern Aleutian Island Archipelago

Mordy, Calvin W.; Stabeno, Phyllis J.; Ladd, Carol; Zeeman, Stephan I.; Wisegarver, David P.; Salo, S. A.; Hunt, George L.

doi:10.1111/j.1365-2419.2005.00364.x

Cited by 85 publications

(72 citation statements)

References 42 publications

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“…Many local eddies and gyres surround these islands Hunt and Stabeno 2005;Stabeno et al 2005). Oceanic conditions have been shown to be important transport mechanisms for micronutrients (Stabeno et al 2002Mordy et al 2005) and zooplankton in this area (Coyle et al 1998;Coyle 2005), potentially contributing to larval retention mechanisms. Cunningham et al (2009) recently presented evidence that gene flow may be restricted in Pacific cod (Gadus macrocephalus) where deep-water barriers, such as underwater canyons or swift currents limit adult dispersal.…”

Section: Discussionmentioning

confidence: 99%

Fine-scale population genetic structure in Alaskan Pacific halibut (Hippoglossus stenolepis)

2009

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Pacific halibut collected in the Aleutian Islands, Bering Sea and Gulf of Alaska were used to test the hypothesis of genetic panmixia for this species in Alaskan marine waters. Nine microsatellite loci and sequence data from the mitochondrial (mtDNA) control region were analyzed. Eighteen unique mtDNA haplotypes were found with no evidence of geographic population structure. Using nine microsatellite loci, significant heterogeneity was detected between Aleutian Island Pacific halibut and fish from the other two regions (F ST range = 0.007-0.008). Significant F ST values represent the first genetic evidence of divergent groups of halibut in the central and western Aleutian Archipelago. No significant genetic differences were found between Pacific halibut in the Gulf of Alaska and the Bering Sea leading to questions about factors contributing to separation of Aleutian halibut. Previous studies have reported Aleutian oceanographic conditions at deep inter-island passes leading to ecological discontinuity and unique community structure east and west of Aleutian passes. Aleutian Pacific halibut genetic structure may result from oceanographic transport mechanisms acting as partial barriers to gene flow with fish from other Alaskan waters.

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Section: Discussionmentioning

confidence: 99%

Fine-scale population genetic structure in Alaskan Pacific halibut (Hippoglossus stenolepis)

2009

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“…Foraging theory predicts that individuals should travel the minimum distance to meet energy requirements (Schoener, 1971), and Bogoslof birds were able to maintain a high energy balance by foraging entirely in the deep oceanic waters surrounding the colony. Further work is needed to assess whether productivity in basin waters surrounding Bogoslof is influenced by passes in the Aleutian Chain that promote high productivity through powerful tidal mixing and the upwelling of nutrients (Mordy et al, 2005). Although colony proximity to important oceanographic features did not totally explain inter-colony differences in food limitation in 2009, the closer proximity of St. George to the continental shelf-break and access to higher energy basin-based prey may be an important buffer in years when food supply on the shelf is poor (Byrd et al, 2008b).…”

Section: Discussionmentioning

confidence: 99%

Does location really matter? An inter-colony comparison of seabirds breeding at varying distances from productive oceanographic features in the Bering Sea

Harding

Paredes

Suryan

et al. 2013

Deep Sea Research Part II: Topical Studies in Oceanography

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a b s t r a c tCentral place foragers, such as breeding seabirds, need to commute between their nests and foraging grounds, thus close proximity of the breeding colony to productive oceanographic features might be beneficial for seabird reproduction. We tested this hypothesis by investigating the at-sea foraging and breeding behavior of thick-billed murres (Uria lomvia) nesting at three colonies (Bogoslof, St. Paul, and St. George Islands) in the Bering Sea located at different distances from the productive continental shelf-break. We found that distances to feeding areas differed only during night trips among colonies. St. Paul murres foraged entirely on the shelf, whereas St. George murres commuted to the continental shelf-break at night and foraged on the shelf during the day. Bogoslof murres foraged in oceanic waters in close proximity to the colony. Murres breeding at the both Pribilof colonies spent less time attending nests and had higher levels of stress hormone corticosterone compared to murres breeding at Bogoslof, although chick-provisioning rates and fledging success were similar among the three colonies. Lower nest attendance and higher corticosterone suggest lower food availability in the Pribilof domain compared to the Bogoslof region. Murres breeding at the Pribilofs used different foraging strategies to buffer effects of food shortages on their reproduction: flight costs associated with longer distance night trips at St. George were presumably balanced by benefits of higher density and/or more lipid rich prey in the continental shelf-break regions, whereas the additional distance of St. Paul from the continental shelf-break may have outweighed any energetic gain. Murres exhibited a remarkable degree of plasticity of foraging strategies in response to changes in their food availability, but the breeding success of murres did not reflect either food limitations or the colony proximity to productive oceanographic features.

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“…The prolonged biological production in the Green Belt is fueled by the increased exchange of macronutrients that occurs from macronutrient-rich basin waters at the shelf break (Stabeno et al 1999;Whitledge and Luchin 1999;Aguilar-Islas et al 2007). Additionally, macronutrients from the Aleutian Island passes, brought to the surface by deep mixing characteristic of these passes (Mordy et al 2005), support the Green Belt at its southern end (Aguilar-Islas et al 2007).…”

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confidence: 99%

The physicochemical speciation of dissolved iron in the Bering Sea, Alaska

Buck

Bruland

2007

Limnology & Oceanography

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The physicochemical speciation of dissolved iron (Fe) across natural dissolved Fe gradients in the oceanic and shelf domains of the southeastern Bering Sea was examined in surface and subsurface samples using competitive ligand exchange-adsorptive cathodic stripping voltammetry with the added ligand salicylaldoxime. Two ligand classes were measured in all samples, a stronger L 1 ligand class and a weaker L 2 ligand class. Conditional stability constants for both ligand classes were comparable between surface and subsurface samples, with mean log K

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Nutrients and primary production along the eastern Aleutian Island Archipelago

Cited by 85 publications

References 42 publications

Fine-scale population genetic structure in Alaskan Pacific halibut (Hippoglossus stenolepis)

Fine-scale population genetic structure in Alaskan Pacific halibut (Hippoglossus stenolepis)

Does location really matter? An inter-colony comparison of seabirds breeding at varying distances from productive oceanographic features in the Bering Sea

The physicochemical speciation of dissolved iron in the Bering Sea, Alaska

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