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FLMNH-ASPIDOLIST-L  October 2012

FLMNH-ASPIDOLIST-L October 2012

Subject:

Re: Fwd: Vicious Predators

From:

[log in to unmask]

Reply-To:

flmnh-aspidolist <[log in to unmask]>

Date:

Wed, 3 Oct 2012 14:35:51 +1000

Content-Type:

text/plain

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text/plain (120 lines)

Hi Scott

Very interesting- and retired - good for you.

All the best

maria


Quoting Smiley Work <[log in to unmask]>:

> Dear Maria
>
> The story here in Kodiak was that there were no Parastichopus  
> californicus (read Apostichopus californicus) in Kodiak when I was  
> first here in 1974 due to their predation by King Crab (Paralithodes  
> camtschaticus) - and that the north-eastern biogeographical province  
> boundary for A. californicus at the end of the Kenai peninsula was  
> due to the presence of  King Crabs - kind of neat thing -  
> biogeographical province boundaries set by predators. Turned out  
> that the most common item in King Crab stomachs in Kodiak during  
> that era was echinoderm parts, most common being vertebrae from  
> ophiuroids! Now with this info on otters we have another predator to  
> worry about - not to mention - given the violent cycling of otter  
> populations as they overgrow their food base - the incredible  
> dynamics of near shore communities over the time scale of a human  
> life. PS. I managed to retire from the University of Alaska and am  
> having a blast indulging all those fascinations I set aside when  
> work deadlines loomed.
>
> Scott
>
>
> On 10/2/12 6:24 PM, [log in to unmask] wrote:
>> Hi Scott
>>
>> I never wold have thought of that
>>
>> thanks
>>
>>
>> Maria
>>
>> Quoting Smiley Work <[log in to unmask]>:
>>
>>> University of Alaska Fairbanks
>>> Juneau Center, School of Fisheries and Ocean Sciences
>>>
>>> SEMINAR NOTICE
>>>
>>> Impacts of sea otter predation on commercially important sea  
>>> cucumbers (Parastichopus californicus) in Southeast Alaska
>>>
>>>
>>> Sean Larson
>>> MS Fisheries Candidate
>>> Juneau Center, School of Fisheries and Ocean Sciences
>>> Advisor: Dr. Ginny Eckert
>>>
>>> Friday, October 5, 2012
>>> 9:00 a.m.
>>>
>>> Presenter - Juneau -UAF Lena Point Fisheries Building, room 101
>>> Fairbanks - O'Neill, Room 214
>>> Kodiak - Owen, Room 219
>>>
>>>
>>>
>>>
>>> Abstract
>>> Sea cucumbers (/Parastichopus californicus/), which are an  
>>> important commercial, subsistence and ecological resource, are  
>>> negatively impacted by an expanding sea otter (/Enhydra lutris/)  
>>> population in Southeast Alaska.  Sea otters were reintroduced into  
>>> Southeast Alaska in the 1960s after their demise in the 18th and  
>>> 19th century fur trade; in the ensuing decades, the otter  
>>> population grew, and sea cucumber biomass declined.  This study  
>>> evaluates the interaction and impacts of sea otters on sea  
>>> cucumbers using sea cucumber foraging observations and survey data  
>>> and sea cucumber density data collected for fishery management.   
>>> Sea cucumbers represented about 5% of the sea otter diet.   
>>> Declines in sea cucumber density ranged from 26 to 100% in areas  
>>> with sea otters and were most severe within areas with high sea  
>>> otter use.  Sea cucumber density was lower in areas sea otters  
>>> inhabited longer.  The impact of sea otters should be included in  
>>> sea cucumber fishery management as a step toward ecosystem based  
>>> management and to ensure resource viability over the long term.
>>>
>>>
>>
>>
>>
>> Dr Maria Byrne
>> Professor Marine and Developmental Biology
>> Deputy Director One Tree Island Research Station
>> Schools of Medical and Biological Sciences
>> University of Sydney
>> pH 61-2-9351-5167
>> FAX 61-2-9351-2813
>> [log in to unmask]
>> http://sydney.edu.au/medicine/anatomy/research/labs/byrne/projects/index.php  
>> ----------------------------------------------------------------
>> This message was sent using IMP, the Internet Messaging Program.
>



Dr Maria Byrne
Professor Marine and Developmental Biology
Deputy Director One Tree Island Research Station
Schools of Medical and Biological Sciences
University of Sydney
pH 61-2-9351-5167
FAX 61-2-9351-2813
[log in to unmask]
http://sydney.edu.au/medicine/anatomy/research/labs/byrne/projects/index.php


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