263:
837:
365:. While overall the species diversity on the seamount is lower than a comparable area on the surface, the species present have grown in greater numbers and have formed larger colonies, to the point that there was little to no bare rock surface on the seamount, and none has been found in expeditionary dives. Some endemism to the seamount has also been noted.
253:
of basalts retrieved from the volcano show that it is about 3.3 million years in age. Cobb
Seamount's slopes average 12° in grade, and are indented by four prominent terraces at various depths; this morphology is partly the result of sub-aerial exposure and wave erosion at sea level and partly due to
442:
There was tentative expert interest in installing an experimentation platform on Cobb
Seamount. The seamount is an easily accessible distance from shore, and would give scientists the ability to work with Cobb Seamount's unique, isolated, and scientifically significant seamount biology. The idea was
232:
Cobb
Seamount is geologically interesting for its terraced, pinnacle structure, and its biological community. Like many other seamounts, Cobb Seamount acts as a biological center of diversity, and supports a dense oceanic ecosystem. Relatively convenient access and an interesting biological setting
419:, visited the seamount, and much of what was initially known about it stems from the expedition. This was followed in 1970, two expeditions in the late 1970s, and 1992, however all have been fairly limited in scope. In 2012, an extensive scientific survey of Cobb Seamount was led jointly by
384:
sponsored a study on the seamount, which concluded that concerns about overfishing at the seamount have some merit. The study also notes that fishermen there have different fishing patterns, because of different physical conditions at the seamount.
274:
Although it is one of over 100 underwater features in the region, Cobb
Seamount is the only one known to extend well upwards into the region of the ocean penetrated by light. Like many other seamounts, Cobb Seamount is a local
480:
624:
Chaytor, J. D., R. A. Keller, R. A. Duncan, and R. P. Dziak (2007), Seamount morphology in the Bowie and Cobb hot spot trails, Gulf of Alaska, Geochem. Geophys. Geosyst., 8, Q09016, doi:10.1029/2007GC001712
254:
volcanic processes far below wave base. The volcano's pinnacle is generally flat, and is defined by a pocketed area approximately 880 m (2,887 ft) by 577 m (1,893 ft) in size.
291:. Bird life has been noted in the area of its summit, indicating that it is a prime fishing ground. For the complete known species inventory of Cobb Seamount, see Du Preez et al., 2015.
304:
and other small, sessile organisms. The species is otherwise scarce in its distribution in the
Pacific; its abundance is accommodated by the scarcity of its chief predator, the
368:
The seamount's abundant sea life has made it a target for heavy fishing since the 1960s. However, the fishing is very difficult to monitor, since Cobb lies outside of the U.S.
400:, Cobb Seamount has been the target of passing cruises and sampling missions, totaling to over 927 km (576 mi) of soundings and dozens of samples by 1967. In 1968,
553:
Desonie, D. L., and R. A. Duncan (1990), The Cobb-Eikelberg seamount chain: Hotspot volcanism with mid-ocean ridge basalt affinity, J. Geophys. Res., 95(B8), 12,697–12,711.
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and therefore fishing vessels are not regulated. It is known that it has been the site of trawling, gill net, and long-line fishing for some time, mostly by the
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872:
424:
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134:
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790:
635:
730:
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229:. By 1967, over 927 km (576 mi) of soundings and dozens of samples from the seamount had been collected.
67:
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and functions as an "island of stability" for local organisms. It supports an extensive fish population, mostly
448:
588:"Structural Design of an Instrumented Mast to be Emplaced on Cobb Seamount in the Northeastern Pacific Ocean"
432:
862:
60:
420:
412:
857:
827:
394:
222:
373:
313:. The reason for the sea star's disparity is unknown, as it is extremely common on nearby seamounts.
209:
369:
765:
262:
250:
104:
791:"2012 expedition to Cobb Seamount: survey methods, data collections, and species observations"
805:
309:
565:
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8:
726:"Diving to Cobb Seamount: A Report on Diving Operations on Project Sea Use, Phase 1,1968"
141:
529:
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have made the seamount an object of several scientific cruises and dives.
723:
346:
342:
267:
159:
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362:
724:
Spencer, Merrill P; Campbell, Spencer D; Carl, Eurick V (May 1969).
599:
436:
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281:
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that terminates near the coast of Alaska. It lies just west of the
177:
109:
660:
16:
Underwater volcano west of Grays Harbor, Washington, United States
358:
798:
Canadian
Technical Report of Fisheries and Aquatic Sciences 3124
643:
Canadian
Technical Report of Fisheries and Aquatic Sciences 3122
788:
377:
350:
301:
196:, United States. Cobb Seamount is one of the seamounts in the
345:
and related species predominant the ecosystem, which includes
241:
Cobb
Seamount lies 270 mi (430 km) off the coast of
663:"Biological Observations from Cobb Seamount rockfish fishery"
354:
332:
185:
117:
435:(AUVs) to conduct high-resolution surveys of the benthic (
661:
Pearson, Donald E; Douglas, David A; Barss, Bill (1993).
701:
Neptune's
Laboratory: Fantasy, Fear, and Science at Sea
570:, Establishing a Rich Legacy nRetrieved August 25, 2018
439:) community above a depth of 1200 meters (3,937 feet).
633:
294:
The summit of the volcano is dominated by a carpet of
825:
789:
Curtis, J., Du Preez, C., 2015.; et al. (2015).
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577:
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547:
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The steeper flanks of the volcanoes are carpeted by
574:
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738:(5). Lippincott Williams & Wilkins: 285–291.
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212:, and was discovered in August 1950 by the U.S.
868:Seamounts of the Cobb–Eickelberg Seamount chain
678:National Oceanic and Atmospheric Administration
382:National Oceanic and Atmospheric Administration
300:, which forms the base of a dense ecosystem of
703:. Harvard University Press. pp. 101–134.
634:Du Preez, C.; Curtis, J.; et al. (2015).
561:
559:
427:(NOAA). The survey used, among other methods,
873:Former islands from the last glacial maximum
810:: CS1 maint: multiple names: authors list (
656:
654:
652:
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245:, in the 8,500 ft (2,600 m)-deep
814:) CS1 maint: numeric names: authors list (
481:"Biological Observations on Cobb Seamount"
188:located 500 km (310 mi) west of
478:
649:
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341:is more common. Red-colored colonies of
261:
406:United States Coast and Geodetic Survey
850:
404:, a multi-party expedition aboard the
393:Since its discovery in August 1950 by
698:
586:Peterson, P. L.; et al. (1969).
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514:
512:
510:
508:
479:Birkeland, Charles (17 March 1971).
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468:
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486:. Northwest Science. Archived from
270:of the type found on Cobb Seamount.
13:
717:
526:University of California, Berkeley
505:
14:
889:
763:
636:"Cobb Seamount Species Inventory"
566:noaa.gov AFSC Historical Corner:
461:
429:remotely operated vehicles (ROVs)
50:824 km (318 sq mi)
835:
731:Journal of Occupational Medicine
782:
757:
692:
627:
618:
592:Offshore Technology Conference
449:Offshore Technology Conference
433:autonomous underwater vehicles
388:
198:Cobb–Eickelberg Seamount chain
135:Cobb–Eickelberg Seamount chain
1:
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423:(DFO) and the United States
42:2,743 m (8,999 ft)
7:
443:proposed by P. L. Peterson
421:Fisheries and Oceans Canada
10:
894:
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447:in a presentation to the
214:Fish and Wildlife Service
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38:
30:
26:
21:
210:Cascadia subduction zone
766:"Deepsea cobb seamount"
370:Exclusive Economic Zone
285:species and especially
34:34 m (112 ft)
769:(Email correspondence)
699:Adler, Antony (2019).
528:. 1967. Archived from
271:
380:fleets. In 1993, the
310:Orthasterias koehleri
297:Hinnites multirugosus
265:
202:underwater volcanoes
863:Submarine volcanoes
532:on 16 February 2011
79: /
338:Borgiola pustulosa
277:biological hotspot
272:
251:Argon–argon dating
182:underwater volcano
114:underwater volcano
83:46.733°N 130.783°W
858:Hotspot volcanoes
606:on 8 October 2011
335:. In some areas,
288:Sebastes miniatus
171:
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146:about 3.3 million
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670:Fishery Bulletin
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602:. Archived from
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88:46.733; -130.783
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600:10.4043/1060-MS
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522:"Cobb Seamount"
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402:Project Sea Use
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318:coralline algae
266:Red encrusting
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220:research vessel
204:created by the
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247:Cascadia Basin
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710:9780674972018
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493:on 2014-03-02
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415:Oceanographer
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409:oceanographic
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323:Lithothamnion
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200:, a chain of
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174:Cobb Seamount
166:
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161:
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156:Discovered by
154:
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22:Cobb Seamount
20:
806:cite journal
797:
784:
772:. Retrieved
764:Britt, Ian.
759:
747:. Retrieved
735:
729:
719:
700:
694:
682:. Retrieved
673:
669:
642:
629:
620:
608:. Retrieved
604:the original
591:
568:John N. Cobb
567:
534:. Retrieved
530:the original
495:. Retrieved
488:the original
444:
441:
414:
401:
397:John N. Cobb
396:
392:
367:
336:
329:Lithophyllum
327:
321:
315:
308:
295:
293:
286:
280:
273:
240:
231:
225:John N. Cobb
224:
206:Cobb hotspot
190:Grays Harbor
173:
172:
164:John N. Cobb
162:
31:Summit depth
774:12 November
749:11 November
684:12 November
610:11 November
413:USC&GS
389:Expeditions
347:sea urchins
142:Age of rock
86: /
61:Coordinates
47:Summit area
852:Categories
536:20 October
497:20 October
455:References
363:gastropods
343:demosponge
268:demosponge
243:Washington
227:(FWS 1601)
194:Washington
680:: 573–576
451:in 1969.
378:Oregonian
217:fisheries
124:Volcanic
437:seafloor
374:Japanese
359:anemones
306:sea star
282:Sebastes
178:seamount
110:Seamount
74:130°47′W
55:Location
744:5772740
417:(R 101)
351:sponges
320:of the
302:sponges
258:Biology
237:Geology
151:History
99:Geology
71:46°44′N
878:Guyots
842:Oceans
828:Portal
742:
707:
445:et al.
361:, and
333:genera
184:) and
167:, 1950
39:Height
794:(PDF)
676:(3).
666:(PDF)
639:(PDF)
491:(PDF)
484:(PDF)
355:algae
186:guyot
176:is a
130:chain
118:guyot
816:link
812:link
776:2010
751:2010
740:PMID
705:ISBN
686:2010
612:2010
538:2010
499:2010
431:and
395:R/V
376:and
326:and
223:R/V
105:Type
596:doi
126:arc
116:),
854::
808:}}
804:{{
796:.
736:11
734:.
728:.
674:19
672:.
668:.
651:^
641:.
594:.
590:.
576:^
558:^
546:^
524:.
507:^
463:^
357:,
353:,
349:,
249:.
192:,
160:MV
830::
818:)
800:.
778:.
753:.
713:.
688:.
645:.
614:.
598::
540:.
501:.
180:(
128:/
112:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
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