Search This Blog

Wednesday, July 14, 2010

Further evidence of Global warming? Rarely seen jellyfish species shows up in San Diego Bay

Apparently a rarely-seen jellyfish species known as the  "Black sea nettle",  has been discovered living in San Diego
Bay,California, USA:




Source of map: http://www.boatharbors.com/images/san_diego_bay_area_marina_map.jpg

Here is a photo of the bay where these jellyfish have populated:

source of image:http://www.public-domain-photos.com/travel/san-diego/san-diego-bay-3-4.htm
Photographer:John Sullivan at http://www.pdphoto.org/
. Thank you to John for allowing me to use his beautiful photo.


Oceanographers suggest that the appearance of this jellyfish could be due to warming of the ocean or possibly due to 
an increase in the populations of plankton which these jellyfish feed upon.
 (see the article: "Rare dark jellyfish species showing up in San Diego Bay "
at the website:
 http://www.usatoday.com/tech/science/discoveries/2010-07-14-rare-jellyfish_N.htm


"The black sea nettle (Chrysaora achlyos), sometimes informally known as the "black jellyfish" 
due to its dark coloration, is a giant jellyfish, with its bell measuring up to 1 m (3 ft) in size, and its
 oral arms extending up to 6 m (20 ft) in length.Despite its size and occasional proximity to Pacific 
coastal cities, the Black sea nettle was only recognized and scientifically described as a 
separate species in 1997, though misidentified pictures of the jellyfish had been taken in 1925.
 It has the scientific distinction of being the largest invertebrate discovered in the twentieth century."
source:http://en.wikipedia.org/wiki/Chrysaora_achlyos




According to an article at the following website: 
http://legacy.signonsandiego.com/news/metro/20070807-9999-1m7jelly.html
"The black sea nettle, rarely seen along the county coastline,
 began its latest surprise visit (in San Diego Bay) a few weeks ago, 
when the ocean water topped 70 degrees."


 "Mystery surrounds the black sea nettle because it has appeared in local waters
 just five times since 1926. The last visit was in 2005.The species typically thrives in 
tropical waters."


Source of image:
http://commons.wikimedia.org/wiki/File:BlackSeaNettle-MontereryAquarium
-April2-07.png




Here is an educational video about these jellyfish which I found at Youtube:


source:http://www.youtube.com/watch?v=auqGEiPzFcA
Thank you to Youtube  member hdvdiva for allowing me to use this video:



 "Jellyfish are viewed as barometers of ocean health and possibly a powerful force 
affecting seawater itself.Scientists remain cloudy about the role of jellyfish in the ocean 
ecosystem, but the creatures are undeniably hardy. Unlike sharks, orcas and other
 aggressive carnivores, jellyfish thrive in ecosystems damaged by human activity.
 From the Gulf of Mexico to the Sea of Japan, oceanographers have found a common 
symptom among places where overfishing, chemical pollution and rising sea temperatures
 have killed off other species: more jellyfish."


"There are suggestions that the whole oceans are turning to jellyfish,"
 said Larry Madin, the director of research at the Woods Hole Oceanographic Institution.
Madin said he finds that theory "premature," but anecdotal evidence shows jellyfish
 species invade places where fish, coral and other marine animals once thrived. They procreate
 more quickly in warmer water, tolerate pollution and escape commercial fishing nets that decimate almost every other marine species."

"Global warming certainly threatens many species, but some can actually benefit — 
at least in the short run. The lifestyle of the jellyfish is testament to that, according to a
 new study."
"The study looked at jellyfish populations in the Bering Sea off Alaska, noting 
a boom in the 1990s followed by a decline since 2000."
"By about 2000, the jellyfish were about 40 times more abundant than they
 had been in 1982, according to analyses of collections from fishing trawlers
 that were reported in the May 29 issue of the journal Progress in Oceanography.
The National Science Foundation, which helped fund the study, said in a
 statement that the Bering Sea jellyfish also expanded their ranges since 
1991 by fanning out  north and west of the Alaskan Peninsula."
"The decreases happened while water temperatures dramatically increased — 
"even though increasing temperatures have been associated with increasing
 jellyfish numbers in lab studies and in other waters," the NSF stated.
Many scientists also believe that warming, overfishing and other stresses fuel 
jellyfish booms in many tourist destinations and commercial fishing areas. 
"These jellyfish-rich locations include Australia, the Gulf of Mexico, Hawaii,
 the Black Sea, Namibia, the United Kingdom, the Mediterranean, the 
Sea of Japan and the Yangtze Estuary" in China, the NSF said."
----------------------------------------------------------------------
It certainly is  sad to realize that these jellyfish suggest the oceans of the World
may be in a deeply troubled state! The Breadth and depth and evolution
 of natural life on our planet is an endless source of fascination for those
 of us who love to study it and learn about it!

No comments:

Visit GM Alexandra Kosteniuk's Women's Chess Blog:Please click on the image below:

Visit GM Alexandra Kosteniuk's Women's Chess Blog:Please click on the image below:
Chess needs more women and girl participants and administrators!

Thoughts worth thinking about

"Our subconscious minds have no sense of humor, play no jokes and cannot tell the difference between reality and an imagined thought or image. What we continually think about eventually will manifest in our lives."-Sidney Madwed



Laws alone can not secure freedom of expression; in order that every woman and man present their views without penalty, there must be spirit of tolerance in the entire population.- Albert Einstein Too often we underestimate the power of a touch, a smile, a kind word, a listening ear, an honest compliment, or the smallest act of caring, all of which have the potential to turn a life around. - Leo Buscaglia



A person's true wealth is the good he or she does in the world. - Mohammed



Our task must be to free ourselves... by widening our circle of compassion to embrace all living creatures and the whole of nature and its beauty. -Albert Einstein



The best way to find yourself, is to lose yourself in the service of others. - Ghandi



The unselfish effort to bring cheer to others will be the beginning of a happier life for ourselves. - Helen Keller



Aim for success, not perfection. Never give up your right to be wrong, because then you will lose the ability to learn new things and move forward with your life. Remember that fear always lurks behind perfectionism. Confronting your fears and allowing yourself the right to be human can, paradoxically, make yourself a happier and more productive person. - Dr. David M. Burns



Life is as dear to a mute creature as it is to man. Just as one wants happiness and fears pain, just as one wants to live and not die, so do other creatures. -His Holiness The Dalai Lama



Mankind's true moral test, its fundamental test (which lies deeply buried from view), consists of its attitude towards those who are at its mercy: animals. And in this respect mankind has suffered a fundamental debacle, a debacle so fundamental that all others stem from it. -



Milan Kundera, The Unbearable Lightness of Being



The worst sin towards our fellow creatures is not to hate them, but to be indifferent to them. That's the essence of inhumanity. -George Bernard Shaw

Ego's trick is to make us lose sight of our interdependence. That kind of ego-thought gives us a perfect justification to look out only for ourselves. But that is far from the truth. In reality we all depend on each other and we have to help each other. The husband has to help his wife, the wife has to help the husband, the mother has to help her children, and the children are supposed to help the parents too, whether they want to or not.-Gehlek Rinpoche Source: "The Best Buddhist Writing 2005 pg. 165

The hostile attitude of conquering nature ignores the basic interdependence of all things and events---that the world beyond the skin is actually an extension of our own bodies---and will end in destroying the very environment from which we emerge and upon which our whole life depends.