scholarly journals Enhancement of coccolithophorid blooms in the Bering Sea by recent environmental changes

2012 ◽  
Vol 26 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Naomi Harada ◽  
Miyako Sato ◽  
Kazumasa Oguri ◽  
Kyoko Hagino ◽  
Yusuke Okazaki ◽  
...  
Keyword(s):  
Bering Sea ◽  
Environmental Changes ◽  
The Bering Sea

scholarly journals Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea

2016 ◽  
Vol 13 (8) ◽  
pp. 2579-2591 ◽  
Author(s):  
Nobuo Kokubun ◽  
Takashi Yamamoto ◽  
Nobuhiko Sato ◽  
Yutaka Watanuki ◽  
Alexis Will ◽  
...  
Keyword(s):  
Bering Sea ◽  
Environmental Changes ◽  
Foraging Ecology ◽  
Stress Hormones ◽  
Food Resource ◽  
Dive Depth ◽  
Bottom Phase ◽  
Seabird Species ◽  
Top Predators ◽  
The Bering Sea

Abstract. Subarctic environmental changes are expected to affect the foraging ecology of marine top predators, but the response to such changes may vary among species if they use food resources differently. We examined the characteristics of foraging behavior of two sympatric congeneric diving seabird: common (Uria aalge: hereafter COMUs) and thick-billed (U. lomvia: hereafter TBMUs) murres breeding on St. George Island, located in the seasonal sea-ice region of the Bering Sea. We investigated their foraging trip and flight durations, diel patterns of dive depth, and underwater wing strokes, along with wing morphology and blood stable isotope signatures and stress hormones. Acceleration–temperature–depth loggers were attached to chick-guarding birds, and data were obtained from 7 COMUs and 12 TBMUs. Both species showed similar mean trip duration (13.2 h for COMUs and 10.5 h for TBMUs) and similar diurnal patterns of diving (frequent dives to various depths in the daytime and less frequent dives to shallow depths in the nighttime). During the daytime, the dive depths of COMUs had two peaks in shallow (18.1 m) and deep (74.2 m) depths, while those of TBMUs were 20.2 m and 59.7 m. COMUs showed more frequent wing strokes during the bottom phase of dives (1.90 s−1) than TBMUs (1.66 s−1). Fish occurred more frequently in the bill loads of COMUs (85 %) than those of TBMUs (56 %). The δ15N value of blood was significantly higher in COMUs (14.5 ‰) than in TBMUs (13.1 ‰). The relatively small wing area (0.053 m2) of COMUs compared to TBMUs (0.067 m2) may facilitate their increased agility while foraging and allow them to capture more mobile prey such as larger fishes that inhabit deeper depths. These differences in food resource use may lead to the differential responses of the two murre species to marine environmental changes in the Bering Sea.

Preliminary isopach map of the Bering Sea basin

1976 ◽  
Author(s):  
Alan K. Cooper ◽  
K.A. Bailey ◽  
M. S. Marlow ◽  
D. W. Scholl ◽  
C.E. Carpenter
Keyword(s):  
Bering Sea ◽  
Isopach Map ◽  
The Bering Sea

Sonobuoy seismic data collected during 1982 in the Bering Sea

1982 ◽  
Author(s):  
A. K. Cooper ◽  
M. S. Marlow ◽  
Thomas O'Brien
Keyword(s):  
Bering Sea ◽  
Seismic Data ◽  
The Bering Sea

Aspidisca beringiana sp. nov. and Simbiodisca subgen. nov. (Ciliophora, Euplotida), a symbiont of terebellid polychaetes in the Bering Sea

2009 ◽  
Vol 18 (2) ◽  
pp. 184-190
Author(s):  
A.W. Jankowski
Keyword(s):  
Bering Sea ◽  
Tidal Zone ◽  
Generic Rank ◽  
New Subgenus ◽  
Bering Island ◽  
The Bering Sea

Terebellids in tidal zone of the Bering Island bear three new symbionts - rhabdophryid suctorians, peritrichs with small rosette-like colonies and aspidiscid hypotrich with a long peristome parallel to left body margin. This is the main feature of a new subgenus of the genus Aspidisca, named Simbiodisca. It may deserve the full generic rank if the use of protargol silvering method will not reveal any upper left rudiment of the peristomal membranelles.

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