Sunday, September 23, 2012

UPDATE! Ophiothela brittle stars Invade the Atlantic!

UPDATE: New pictures provided by Gustavo Beolchi show Ophiothela from Angra in Brazil..
on sponges..
esponja e ofiuróide

on a gorgonain
Coral e ofiuróide


BEFORE....
A recent alert went out from ophiuroid biologist at the Los Angeles County Museum- Dr. Gordon Hendler that a six-rayed brittle star from the Indo-Pacific has invaded the Atlantic! 

A pdf account of this from Coral Reefs can be downloaded here.

Invasive species are those which are artificially introduced into regions where they are not native. Their presence can directly or indirectly have significant to dire consequences on the ecology of a particular region.

Ophiothela is a clonal, six-armed brittle star that typically occurs in the Indo-Pacific as seen here (species shown is Ophiothela danae).  Photo by Wild Singapore.
Tiny colourful brittle stars (Ophiothela danae) in sea fan

Wild Singapore has a great page on these (note that not all of these seem to be Ophiothela however)
go here to see it!

But Ophiothela mirabilis seems to have invaded Brazil and St. Vincent as reported above. The species was first observed in Brazil of 2000 and has been observed slowly spreading throughout Brazil and the Caribbean.

This brittle star is asexual, specifically it is fissiparous and so it clones itself, thus facilitating its spread. Unlike other tiny commensal brittle stars, this one seems to have "low host specificity" which means that it can live on just about anything that it is compatible with (as seen below) from gorgonians to sponges..

Courtesy of the Brazillian website Cifonauta here is one of several videos of this invasive species in Brazil! They have several more pictures of this species also...

Can Crowd-Sourcing Help???
A quick look on Flickr indeed shows Ophiothela mirabilis as observed on Polymastia janeirensis (a sponge) from João Fernandes Beach - Buzios - RJ - Brazil (image from August 16, 2009). O. mirabilis is the tiny little orange thing clinging on below...
Polymastia janeirensis and Ophiothela
Photo by "Sea Girl".

Here's another pic from Brazil of what look to be Ophiothela (or maybe not hard to say without a close up) wrapped around what the photographer calls Leptogorgia punicea (a gorgonian)
coral e ofiuróide

The many eyes and cameras of the internet permit greater powers of tracking and observation of this species!  Got one from the Atlantic?  Post links to pics in the comments! Or contact me (or Dr. Hendler) for more info!

4 comments:

Anonymous said...

But how did it even began?

ChrisM said...

The evolutionary history of these animals is poorly known.

Gustavo Beolchi said...

I see you have used one of my wife's Ophiotela sp. pictures. On her flickr account you will find better ones.
Ophitela over sponge.
http://www.flickr.com/photos/jupisa/6832428437/in/set-72157629207179939

Ophiotela over coral.
http://www.flickr.com/photos/jupisa/6832422505/in/set-72157629207179939

Also we use to take lots of underwater pictures of marine life. If you wish check my facebook albuns.

Kind regards
Gustavo Beolchi

ChrisM said...

Great! thanks!