Interannual variability of coccolithophore Emiliania huxleyi blooms in response to changes in water column stability in the eastern Bering Sea

2012 ◽  
Vol 34 ◽  
pp. 7-17 ◽  
Author(s):  
T. Iida ◽  
K. Mizobata ◽  
S.-I. Saitoh
Keyword(s):  
Interannual Variability ◽  
Water Column ◽  
Bering Sea ◽  
Emiliania Huxleyi ◽  
Water Column Stability ◽  
Eastern Bering Sea

scholarly journals Spring plankton dynamics in the Eastern Bering Sea, 1971-2050: Mechanisms of interannual variability diagnosed with a numerical model

2016 ◽  
Vol 121 (2) ◽  
pp. 1476-1501 ◽  
Author(s):  
Neil S. Banas ◽  
Jinlun Zhang ◽  
Robert G. Campbell ◽  
Raymond N. Sambrotto ◽  
Michael W. Lomas ◽  
...  
Keyword(s):  
Numerical Model ◽  
Interannual Variability ◽  
Bering Sea ◽  
Plankton Dynamics ◽  
Eastern Bering Sea

Sea ice and water column structure on the eastern Bering Sea shelf

2014 ◽  
Vol 109 ◽  
pp. 39-56 ◽  
Author(s):  
Margaret E. Sullivan ◽  
Nancy B. Kachel ◽  
Calvin W. Mordy ◽  
Sigrid A. Salo ◽  
Phyllis J. Stabeno
Keyword(s):  
Sea Ice ◽  
Water Column ◽  
Bering Sea ◽  
Eastern Bering Sea ◽  
Column Structure ◽  
Bering Sea Shelf

Combining data from bottom-trawl and acoustic-trawl surveys to estimate an index of abundance for semipelagic species

2018 ◽  
Vol 75 (1) ◽  
pp. 60-71 ◽  
Author(s):  
Stan Kotwicki ◽  
Patrick H. Ressler ◽  
James N. Ianelli ◽  
André E. Punt ◽  
John K. Horne
Keyword(s):  
Spatial Distribution ◽  
Water Column ◽  
Bering Sea ◽  
Survey Methods ◽  
Bottom Trawl ◽  
Eastern Bering Sea ◽  
Abundance Estimates ◽  
Combining Data ◽  
Bias Ratio ◽  
Index Of Abundance

Fishery-independent surveys are useful for estimating abundance of fish populations and their spatial distribution. It is necessary in the case of semipelagic species to perform acoustic-trawl (AT) and bottom-trawl (BT) surveys to ensure that sampling encompasses both midwater and demersal components of the population. Abundance estimates from both survey types are negatively biased because of the blind zones associated with fish vertical distribution. These biases can vary spatially and temporally, resulting in confounded trends and additional variation in abundance estimates. To improve abundance estimates for semipelagic species we propose a new method for combining BT and AT survey data using environmental variables to predict the vertical overlap. Using walleye pollock (Gadus chalcogrammus) AT and BT surveys in the eastern Bering Sea as an example, we show that combined estimates provide more reliable whole water column and spatial distribution estimates than either survey can by itself. Although the combined estimates are still relative, they account for the uncertainty in the bias ratio between the two survey methods and the uncertainty associated with the extent of the water column sampled by both surveys. Our method of combining BT and AT data can be extended to other semipelagic species.

Causes of interannual variability in the sea ice cover of the Eastern Bering Sea

GeoJournal ◽  
1989 ◽  
Vol 18 (1) ◽  
pp. 45-59 ◽  
Author(s):  
H. J. Niebauer ◽  
Robert H. Day
Keyword(s):  
Sea Ice ◽  
Interannual Variability ◽  
Bering Sea ◽  
Ice Cover ◽  
Eastern Bering Sea
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