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Subject: Re: Reference on prey size selectivity by birds on fish
From: Rob Wallace <[log in to unmask]>
Reply-To:[log in to unmask]
Date:Tue, 10 Dec 1996 21:30:02 -0800

text/plain (74 lines)

This is not my area, but I know of two theses on loons, cormorants, and
others feeding on fish. Species and size selection are <probably>
1. Shelley Matkowski about 1987 University of Manitoba worked on small
lakes stocked with rainbow trout, brook trout, and maybe splake trout.
2. Barb Hanbidge about 1985 University of Saskatchewan worked on large
lake with complaints of cormorants preying on walleye and other large
I will try to find citations for you.  If you find them, let me know. If
you don't hear this week or next, please get back to me directly.
Rob Wallace
> Hello everyone :
> First, please excuse the cross-posting if you received more than one
> copy of this letter !!  I'm trying to post to both fisheries and
> wildlife people here.
> I have exhausted all avenues of literature searching only to come up
> nearly empty-handed.  I am looking for papers that investigate avian
> predation on stream dwelling fish and lake dwelling fish.  I would like
> to find out if there is any evidence of birds preferentially taking
> larger fish or smaller fish as prey items.
> I am doing my Masters on Atlantic salmon alevins and it appears
> through otolith microstructure analysis that there has been a shift
> over the summer to small sized alevins, meaning there has been some
> kind of size-selective mortality ocurring on larger alevins.  The only
> predators present in the river system on which I work are birds (ie.
> belted kigfishers, common mergansers) and sea trout.  However, the
> sea-run brook trout do not really start congregating in the river
> until the late summer early fall, although there are some residents.
> Therefore, I believe that fish predation is relatively limited.
> In summary, I'm looking for help with references on :
> 1.  Size-selective predation by birds on young fish in (A) streams
>     and rivers and (B) lakes.  (I would like to see if there are any
>     differences between these two environments.
> 2.  I would also like to see if there are any examples of this being
>     found with respect to fish predators on other fish.
> Examples where the prey are juvenile or larvel fish would be best.
> Thanks to all in advance.  You can reply directly to me at :
> [log in to unmask]   or you can repost to the list if you want
> others to see what you have to say.
> Thanks again !!  Shawn P. Good
> -----------------------------------------
> Shawn P. Good
> Centre Interuniversitaire
>    de Recherche sur le Saumon Atlantique
> GIROQ, Rm 2073
> Pav. Vachon, Univ. Laval
> Quebec City, PQ
> G1K 7P4
> E-mail :  [log in to unmask]
> (418) 656-2131   Ext. 8022
> (418) 656-2339   FAX
>     .            .:/
>      .       ,,,///;,   ,;/
>        .   O:{{{{{{{{;;///
>           >:){{{{{{{{;;\\\
>             '''\\\\\    ';\.
>                   ';\
> _________________________________________

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