[Cnidaria] Re: Cnidaria Digest, Vol 43, Issue 17
Hans G. Hansson
hans.g.hansson at tmbl.gu.se
Tue Nov 27 04:12:10 PST 2007
26 nov 2007 kl. 16.51 skrev Nando Boero:
> If you take the volume II of FS Russell on The Medusae of the
> British Isles and you go to page 85 you will find a paragraph on
> the Swarming of Pelagia around the British Isles (you can download
> it here: http://www.mba.ac.uk/NMBL/publications/medusae_2/
> medusae_2.htm). He reports this:
>
> Cole (1952) recalled astonishing numbers in Port Erin Bay, Isle of
> Man, in october 1899 (the present event is in November, so it is
> not so different; my note) when "the sea looked as if converted
> into a solid mass of jellyfish".
> Hunt (1952) recorded the occurrence of about sixty specimens in the
> estuary of the river Yealm, South Devon, in December 1951. Fraser
> (1954) recorded Pelagia in 1953 off Shetland, Fair Isle, west of
> Orkney, and in the North Sea, east of 1° W at times "in sufficient
> numbers to cause inconvenience to fishermen".
>
> So, the occurrence of Pelagia in northern waters, in the winter, is
> not so exceptional. Then, if you ask why a southern species is
> present massively at northern latitudes, maybe one explanation
> might be global warming, right?
> These things happened already in the past, but very few studies are
> dedicated to gelatinous plankton, unless its presence is
> particularly obnoxious, then it is forgotten until the following
> event.
>
> It is a widespread opinion that the removal of large fish from
> trophic networks (due to fisheries) is leaving space to other top
> predators that are not affected by fisheries: the gelatinous
> predators. We are providing the proper conditions to their
> development by removing their competitors.
>
> We thought that we can deplete the resources of the ocean and then
> we can have more production by pursuing aquaculture. Big mistake.
> Salmon are usually not killed by pelagia swarms, they can swim away
> (but their larvae and juveniles do not escape, though). But if they
> are in a cage, then they are stuck there, and die. They should have
> been released when the swarm was first noticed. But who does look
> at jellyfish swarms?
>
> Another question is: what can we do? the answer is straightforward:
> nothing. What can you do to stop hurricanes? But then, yes, there
> are things we might do. Restore trophic networks, allowing for the
> growth of larger fish, instead of taking them all. Re-consider
> aquaculture: we rear carnivores, and we feed them with fish that we
> take from natural populations. This is ecologically crazy. Or we
> try to transform carnivores into herbivores, feeding them with soja
> (on land we tried to transform herbivores into carnivores, hence
> the mad cow disease). This is affecting ecosystems in a way that is
> conducive to jellyfish blooms all over the world. We are going back
> to a pre-cambrian ocean. But these answers are not nice to hear. A
> change in our research strategies is badly needed. But if I say
> these things here, I am preaching to the priests...
> all the best
> nando
>
>
> Ferdinando Boero
> DiSTeBA (Dipartimento di Scienze e
> Tecnologie Biologiche e Ambientali)
> Universita' del Salento
> 73100 Lecce
> Italy
> Voice: -39 0832 298619
> Handphone: 3332144956
> Fax: -39 0832 298702 or 298626
> email: boero at unile.it
>
> http://homepage.ntlworld.com/andymurkin/Resources/MusicRes/ZapRes/
> natphen.html
>
> VISIT AQUATIC BIOLOGY:
> http://www.int-res.com/journals/ab/ab-home/
>
> VISIT ITALIAN JOURNAL OF ZOOLOGY:
> http://www.tandf.co.uk/journals/titles/11250003.asp
>
>
>
> On 26/nov/07, at 12:3812:2, cnidaria-request at uci.edu wrote:
>
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>> Today's Topics:
>>
>> 1. FW: reasons for invasion of Pelagia noctiluca in Northern
>> Ireland / Scotland (Richard Lord)
>> 2. RE: FW: reasons for invasion of Pelagia noctiluca inNorthern
>> Ireland / Scotland (Doyle, Tom)
>> 3. F. Pag?s thesis & paper copy request
>> (jessica.frost at uni-hamburg.de)
>>
>>
>> ---------------------------------------------------------------------
>> -
>>
>> Message: 1
>> Date: Sun, 25 Nov 2007 20:54:57 -0000
>> From: "Richard Lord" <fishinfo at guernsey.net>
>> Subject: [Cnidaria] FW: reasons for invasion of Pelagia noctiluca in
>> Northern Ireland / Scotland
>> To: "'Cnidaria Newsgroup'" <cnidaria at uci.edu>
>> Message-ID: <000601c82fa5$75b95a50$6802a8c0 at FISHWORK>
>> Content-Type: text/plain; charset="us-ascii"
>>
>> Mr. Matthew G. Longman sent me the email below and was happy for
>> me to
>> forward it to the cnidaria email list. Would experts in scyphozoa
>> blooms
>> kindly offer explanations of why over the last few weeks immense
>> numbers of
>> small Pelagia noctiluca have invaded waters of Ireland and
>> Northern Ireland
>> and now the west coast of Scotland. Is the November timing of the
>> bloom
>> unusual and particularly at this northern latitude?
>>
>>
>>
>> Best wishes,
>>
>> Yours sincerely,
>>
>> Richard
>>
>> Richard Lord
>>
>> Guernsey GY1 1BQ
>>
>> Great Britain
>>
>>
>>
>> Tel: 01481 700688
>>
>> Fax: 01481 700686
>>
>> Email: fishinfo at guernsey.net
>>
>> http://www.sealordphotography.net <http://
>> www.sealordphotography.net/>
>>
>>
>>
>> -----Original Message-----
>> From: Matthew Longman [mailto:mlongman at csf.edu]
>> Sent: 25 November 2007 02:54
>> To: fishinfo at guernsey.net
>> Subject: mauve rarity
>>
>>
>>
>>
>>
>> Mr. Lord...
>>
>> i am a student researching environmental rarities and i would like
>> to know
>> some things about the recent news concerning mauve stinger and
>> compass
>> jellyfish swarming around the British Isles. The articles i have
>> read
>> pointed out that seeing these particular jellyfish in these areas is
>> abnormal for winter months. is there any reason particular why these
>> jellyfish would be in this area in such numbers? if you are
>> unsure of any
>> reasons, please refer me to someone who may know. thank you.
>>
>> sincerely, Matthew G. Longman.
>>
>> -------------- next part --------------
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>> ------------------------------
>>
>> Message: 2
>> Date: Mon, 26 Nov 2007 08:54:30 -0000
>> From: "Doyle, Tom" <t.doyle at ucc.ie>
>> Subject: RE: [Cnidaria] FW: reasons for invasion of Pelagia noctiluca
>> inNorthern Ireland / Scotland
>> To: "Cnidaria Newsgroup" <cnidaria at uci.edu>
>> Message-ID:
>> <C918D8F06771A8438E3C4DEE9D82BA9BD8000F at EXCH1.central.ad.ucc.ie>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hi Matthew,
>>
>> Pelagia is more typical of warmer waters but does regularly occur
>> in our waters during October-December when it is carried up here
>> via the Jet Current (a current that runs up along the Bay of
>> Biscay and off the west coast of Ireland). So its not unusual to
>> see Pelagia at this time of the year, however, it is probably
>> unusual to see such numbers and such widespread occurrence i.e.
>> offshore, west + north coast of Ireland and now Scotland (do you
>> know where in Scotland they are washing up?). How far they head
>> north depends on the strength of the Jet current, which varies
>> from year to year, and so is probably very strong this year. There
>> are records of Pelagia washing up in large numbers off the coast
>> of Ireland going back 100 years (Delap sisters), more recent
>> reports off the west coast of Ireland (1998), and in 1966 (or
>> around this year) enormous numbers were reported in the Irish Sea.
>> Hope this helps,
>>
>> All the best,
>>
>> Tom.
>>
>> Thomas K Doyle, PhD
>> Coastal and Marine Resources Centre
>> University College Cork
>> Glucksman Marine Facility, Naval Base
>> Haulbowline, Cobh
>> County Cork
>> Ireland
>>
>> Tel: 00353 21 4703119
>> Fax: 00353 21 4703132
>> Email: t.doyle at ucc.ie
>>
>>
>>
>> -----Original Message-----
>> From: cnidaria-bounces at uci.edu [mailto:cnidaria-bounces at uci.edu]On
>> Behalf Of Richard Lord
>> Sent: 25 November 2007 20:55
>> To: 'Cnidaria Newsgroup'
>> Subject: [Cnidaria] FW: reasons for invasion of Pelagia noctiluca
>> inNorthern Ireland / Scotland
>>
>>
>>
>> Mr. Matthew G. Longman sent me the email below and was happy for
>> me to forward it to the cnidaria email list. Would experts in
>> scyphozoa blooms kindly offer explanations of why over the last
>> few weeks immense numbers of small Pelagia noctiluca have invaded
>> waters of Ireland and Northern Ireland and now the west coast of
>> Scotland. Is the November timing of the bloom unusual and
>> particularly at this northern latitude?
>>
>>
>>
>> Best wishes,
>>
>> Yours sincerely,
>>
>> Richard
>>
>> Richard Lord
>>
>> Guernsey GY1 1BQ
>>
>> Great Britain
>>
>>
>>
>> Tel: 01481 700688
>>
>> Fax: 01481 700686
>>
>> Email: fishinfo at guernsey.net
>>
>> http://www.sealordphotography.net <http://
>> www.sealordphotography.net/>
>>
>>
>>
>> -----Original Message-----
>> From: Matthew Longman [mailto:mlongman at csf.edu]
>> Sent: 25 November 2007 02:54
>> To: fishinfo at guernsey.net
>> Subject: mauve rarity
>>
>>
>>
>>
>>
>> Mr. Lord...
>>
>> i am a student researching environmental rarities and i would like
>> to know some things about the recent news concerning mauve stinger
>> and compass jellyfish swarming around the British Isles. The
>> articles i have read pointed out that seeing these particular
>> jellyfish in these areas is abnormal for winter months. is there
>> any reason particular why these jellyfish would be in this area in
>> such numbers? if you are unsure of any reasons, please refer me
>> to someone who may know. thank you.
>>
>> sincerely, Matthew G. Longman.
>>
>> -------------- next part --------------
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>>
>> ------------------------------
>>
>> Message: 3
>> Date: Mon, 26 Nov 2007 12:33:49 +0100
>> From: jessica.frost at uni-hamburg.de
>> Subject: [Cnidaria] F. Pag?s thesis & paper copy request
>> To: cnidaria at uci.edu
>> Message-ID: <1196076829.474aaf1dd08f0 at webmail.rrz.uni-hamburg.de>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> Greetings Fellow Researchers,
>>
>> This email is a rather difficult and awkward one to write as it
>> leaves me
>> reminded of sadness. I am searching for a copy of Francesc Pagés'
>> PhD thesis
>> from the University of Barcelona (1991) on the "Ecology and
>> Systematics of
>> Planktonic Cnidarians of the Benguela Current" (it is ok if it is
>> in Spanish),
>> as well as his paper in the South African Journal of Zoology
>> (1992) "Influence
>> of the thermocline on the vertical migration of medusae during a
>> 48h sampling
>> period". If anyone can provide a pdf of each, it would be much
>> appreciated. I
>> know that Francesc was dear to many of us, and, for me in
>> particular, he was
>> not only a generous and kind colleague but a fantasticly
>> supportive mentor, a
>> rarity these days!
>>
>> All the Best,
>> Jessica Frost
>>
>> University of Hamburg
>> Institute for Hydrobiology and Fisheries Science
>> Grosse Elbstrasse 133
>> 22767 Hamburg
>> jessica.frost at uni-hamburg.de
>>
>>
>> ------------------------------
>>
>> _______________________________________________
>> List-Info: https://maillists.uci.edu/mailman/listinfo/cnidaria
>>
>>
>> End of Cnidaria Digest, Vol 43, Issue 17
>> ****************************************
>
> _______________________________________________
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>
Hello all cnidariologists,
Nando Boero's notes regarding northern occurences of Pelagia
noctiluca, got me to think about a short note in Swedish, which I
published in 1971*. The note concerned i.a. some Atlantic gelatinous
plankton species that had been washed ashore along the Swedish west
coast after a severe storm the second week in October 1969. I spent
the weekend after the storm (Oct. 15-16) in my home island at that
time (Malmön, situated arund 15 km NW of the Kristineberg Marine
Research Station) and when walking along sandy beaches , they were
more or less covered by Salpa fusiformis (blastozooids & oozooids),
but along with the salps, I also found several hundreds of Pelagia
noctiluca (diameter 2-6 cm) and of course also some more normal
medusae for the area, like Leuckartiara octona, Tima bairdii &
Aequorea vitrina. Chrysaora hysoscella, related to Pelagia, had been
common earlier that autumn, but was not observered in mid October.
After that time, I have never seen Pelagia here again. I have looked
a little the latest week, but only seen some stranded large specimens
of Cyanea capillata. Beside comb jellies (mainly the very common
invader Mnemiopsis) the only spectacular gelatinous plankton to see
in the sea are siphostomal fragments (a few cm to around half a meter
long) of Apolemia uvaria, which after its first appearance in
Scandinavia in November 1997, has been observed in Oct. 2003, Oct--
Nov. 2005, autumn 2006 and Nov. 2007. They seem to appear in the
surface water only after a period of upwelling of more saline water
from below.
Hansson, H.G. 1971. Några fynd av atlantiska faunaelement i Bohuslän
efter höststormarna 1969. Fauna och flora Årgång 66 (3): 118-120.
best wishes
Hans G. H.
------------------------------------------------------
Hans G. Hansson
Hans.G.Hansson at tmbl.gu.se
Tjaernoe Marine Biological Laboratory
S-45296 Stroemstad, Sweden
Phone 0526/ 686 36
iChat AOL account for Bonjour: hans.g.hansson
Personal web site: http://www.tmbl.gu.se/staff/HansGHansson_1.html
BEMON: http://www.tmbl.gu.se/libdb/taxon/personetymol/index.htm
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