Dear Marin
Good to hear from you and my best wishes (and to all on the
mailing list) for a happy new year.
Re. Cephalopods in estuaries
In trawling in UK east-coast estuaries and on power station
screens, we have occasionally taken Eledone (N Sea
octopus), squid and the small sepiolidae Rossia. The
records are usually from summer when the salinities are
higher. (Have a look in the field sampling notes from
the SEPA East trawling programme in the Forth). Our power
station records for the Humber to date are mostly from the
winter although we are now starting monthly sampling to
cover an annual cycle (details from Nigel Proctor in the
Institute (of Estuarine & Coastal Studies)
([log in to unmask]). We have not taken any
cephalopods during those previous samples but the
salinities will be less than 15 for most of the time. I
gather that cephalopods are very poor osmoregulators (like
echinoderms) and so their capacity for living in estuaries
is very small. I'll let you know if I come across anymore
information.
best wishes
Mike
----------------------
Dr. Mike Elliott
Institute of Estuarine & Coastal Studies,
& Dept. of Biological Sciences
University of Hull
Hull, HU6 7RX, UK
Tel. +44 (0)1482 465503
Fax. +44 (0)1482 465458 (Dept.)
+44 (0)1482 465001 (IECS)
[log in to unmask]
On Thu, 7 Jan 1999 09:38:43 -0000 Marin Greenwood {PG}
<[log in to unmask]> wrote:
> Happy New Year to all members of estuarine-sceince.
>
> Into its second month of existence, estuarine-science now has over 230
> members, with this number increasing daily.
>
> As some of you know, I am by training a fish ecologist, but I am also
> greatly interested in cephalopods (octopus, cuttlefish, squid, Nautilus)
> because of their ecological similarities to fish. No cephalopods exist in
> freshwaters, but I was wondering if anyone had any evidence of estuarine
> occurrence. I have heard of octopus being entrained at power station
> intakes in mid-estuary areas (salinity 8-25), but have not seen any myself.
> Are cephalopods limited by their osmoregulatory abilities to be only
> adventitious species in estuaries, or are there other more important factors
> perhaps involved as well?
>
> Best wishes
>
> Marin Greenwood, List Owner
> Forth Estuary Ecology Group
> Institute of Biological Sciences
> University of Stirling
> Scotland
> FK9 4LA
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