Jump to content


Photo
- - - - -

Caribbean Isopod on Seafan


  • Please log in to reply
7 replies to this topic

#1 Alex_Mustard

Alex_Mustard

    The Doctor

  • Super Mod
  • 8376 posts
  • Gender:Male
  • Location:Peterborough

Posted 19 October 2012 - 10:48 PM

I think we've had it before, but I can't find any old threads. So any suggestions for this small commensal isopod, living on a seafan in Grand Cayman?

CAY12_am-18066.jpg

Alex

Alexander Mustard - www.amustard.com - www.magic-filters.com
Nikon D4 (Subal housing). Nikon D7100 (Subal housing). Olympus EPL-5 (Nauticam housing).


#2 Giles

Giles

    International Supermodel

  • Moderator
  • 2618 posts
  • Gender:Male
  • Location:Cayman Islands
  • Interests:water and sun my friend, thats what turns me on.

Posted 20 October 2012 - 08:14 AM

http://wetpixel.com/...showtopic=14269

sadly the images no longer show for these last two posts.:
http://wetpixel.com/...showtopic=14407
http://wetpixel.com/...showtopic=44462
me on the web >> journal / flickr / portfolio
i use >> my camera, eye & stunning good looks

#3 Leslie

Leslie

    Worm Girl

  • Critter Expert
  • 1816 posts
  • Location:Natural History Museum of Los Angeles County
  • Interests:marine inverts (especially polychaetes), micro- and macrophotography

Posted 20 October 2012 - 09:33 AM

I'm pretty sure it's another sphaeromatid isopod Alex.

#4 Bent C

Bent C

    Manta Ray

  • Member
  • PipPipPip
  • 439 posts
  • Gender:Male
  • Location:Sweden

Posted 20 October 2012 - 01:23 PM

Do you actually know it is commensal, Alex? I see quite a lot of symbiotic, extremely well camouflaged isopods on sea fans and sponges, and mostly they seem to be perceived as commensals. Are there any data to corroborate that they are indeed commensals? I haven't been able to find any studies showing the direction of the interaction.
Bent Christensen
Nauticam and Canon 7D
http://bentmedia.me

#5 Leslie

Leslie

    Worm Girl

  • Critter Expert
  • 1816 posts
  • Location:Natural History Museum of Los Angeles County
  • Interests:marine inverts (especially polychaetes), micro- and macrophotography

Posted 25 October 2012 - 09:04 AM

Just an FYI.....

A lot of people unintentionally use "symbiotic" and "commensal" as synonyms. Symbionts are animals that live in association with another organism; the term doesn't imply anything about their relationship. Commensals are symbionts in a relationship where one benefits while the other is unaffected either negatively or positively. For example, if this isopod is protected from predation by living on the sea fan but the sea fan isn't impacted then it's a commensal association. Mutualism is where both benefit - the isopod gets protection or food while the sea fan gets cleaned of silt or gets additional nutrition from the isopod's feces. There are a lot of different types of symbiotic relationships.

#6 Bent C

Bent C

    Manta Ray

  • Member
  • PipPipPip
  • 439 posts
  • Gender:Male
  • Location:Sweden

Posted 29 October 2012 - 11:28 AM

Leslie, do you know of any studies actually trying to determine the direction of the interaction?

regards Bent
Bent Christensen
Nauticam and Canon 7D
http://bentmedia.me

#7 Leslie

Leslie

    Worm Girl

  • Critter Expert
  • 1816 posts
  • Location:Natural History Museum of Los Angeles County
  • Interests:marine inverts (especially polychaetes), micro- and macrophotography

Posted 29 October 2012 - 11:59 AM

I don't, but I"ll ask my supervisor, Regina Wetzer, who's an expert on sphaeromatids.

(10 minutes later). She says no. Only one species out of the whole family has been kept alive in the lab so its life history could be studied. For the rest it's all guesswork as to whether they're true symbionts and the nature of the interaction with the host.

There's a little bit of general information on feeding in a recent paper by Poore & Bruce on Global Diversity of Marine Isopods. It's open access at http://www.plosone.o...al.pone.0043529

#8 Bent C

Bent C

    Manta Ray

  • Member
  • PipPipPip
  • 439 posts
  • Gender:Male
  • Location:Sweden

Posted 30 October 2012 - 08:13 AM

Thanks a lot, Leslie.
Bent Christensen
Nauticam and Canon 7D
http://bentmedia.me