Local species tolerance

Discussion in 'Diving, Collecting and Environmental Discussions' started by RiaanP, 24 Mar 2015.

  1. RiaanP

    RiaanP Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,142
    Likes Received:
    1,228
    Location:
    Centurion
    Question to the marine biologist amongst us.

    Take for example cushion stars. They are found from Northern end of Natal all the way down to past Knysna. Some other sea stars are found from Natal all the way to Southern Namibia. Giving the species overall a broad range of acceptable temperature extremes. Or a range that they can tolerate. Or are they used to a certain value since birth - the individual is used to a certain temperature although as a family they can tolerate other values.

    Would specimens from both extreme ends of their natural range, adjust the same to captivity in our tanks running at 25 degrees Celsius?

    Question is not only on sea stars. Any critter whose natural range is from the warm waters of Northern Natal all the way down to the cold waters of the Cape.
     
  2. AdS Guest




    to hide all adverts.
  3. Daryl Norton

    Daryl Norton

    Joined:
    14 Aug 2013
    Posts:
    332
    Likes Received:
    11
    Location:
    Port Elizabeth
    Interesting, tagging along.
     
  4. KeeganP

    KeeganP

    Joined:
    23 Jan 2008
    Posts:
    1,880
    Likes Received:
    53
    Good question...

    I'm no marine biologist, but if I were to say.
    If they were accumulated correctly they would adjust?
    Seeing that there are able to live in a wide range of temp etc.

    Come to think of it, I have never accumulated cushion star's before :eek:
    Just popped them in...
     
  5. Daryl Norton

    Daryl Norton

    Joined:
    14 Aug 2013
    Posts:
    332
    Likes Received:
    11
    Location:
    Port Elizabeth
    Does anybody have a pic of the cushion stars? Want to see if they the same as here in eastern cape (PE).

    We have warm water here at the moment and in winter it gets VERY cold so I would think they can adjust as they in our pools all year round.
     
    Last edited: 24 Mar 2015
  6. MistaOrange

    MistaOrange

    Joined:
    20 Jan 2010
    Posts:
    7,756
    Likes Received:
    94
    Location:
    Somewhere in Cape Town
    I don't see why it shouldn't survive if acclimated correctly...
     
  7. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,142
    Likes Received:
    1,228
    Location:
    Centurion
    What is the temperature. Not the rock pools either.
     
  8. Daryl Norton

    Daryl Norton

    Joined:
    14 Aug 2013
    Posts:
    332
    Likes Received:
    11
    Location:
    Port Elizabeth
    Havent measured but a guess would be from 22 to 25 somedays. Great for fishing haha

    Pools are obviously warmer but actually find much more in the open gullys to the sea.
     
  9. KeeganP

    KeeganP

    Joined:
    23 Jan 2008
    Posts:
    1,880
    Likes Received:
    53
    Only have the under side..

    [​IMG]
     
    Last edited by a moderator: 24 Mar 2015
  10. JG Swart

    JG Swart

    Joined:
    24 Mar 2014
    Posts:
    49
    Likes Received:
    2
    Location:
    Oudtshoorn
    I have some of them in my tank for more then a year now and still doing fine at 27 degrees
     
  11. Daryl Norton

    Daryl Norton

    Joined:
    14 Aug 2013
    Posts:
    332
    Likes Received:
    11
    Location:
    Port Elizabeth
    Same shape as ours.

    What is their diet? Algae? Often seen them scavenging on meats foods here.
     
  12. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,142
    Likes Received:
    1,228
    Location:
    Centurion
  13. Daryl Norton

    Daryl Norton

    Joined:
    14 Aug 2013
    Posts:
    332
    Likes Received:
    11
    Location:
    Port Elizabeth
    Today's Summerstrand sea temperature is 19.1 °C (Statistics for 24 Mar 1981-2005 - mean: 22.4 max: 23.7 min: 21.1 °C)

    Slightly chilly for this time of year.

    Im by no means an expert here, just my wild uneducated guess. Still not near 25 so no idea if they would be happy for long in a tank.
     
  14. Daryl Norton

    Daryl Norton

    Joined:
    14 Aug 2013
    Posts:
    332
    Likes Received:
    11
    Location:
    Port Elizabeth
    Also shows that they adjust, sea temp here can rise and drop quickly depending on wind direction and currents on the wild side, Seaview etc.
     
  15. Lord_Blackadder

    Lord_Blackadder

    Joined:
    10 Apr 2012
    Posts:
    1,642
    Likes Received:
    131
    Location:
    Durban
    A species with a mostly cool water distribution is always going to be stressed at tropical temps, even if it can survive for a time. Metabolism will be much higher, so you're looking at a greatly reduced lifespan with greater likelyhood of disease. You generally look at the center of a species range to find it's ideal conditions. So if something is found from CT to Durban then it's most likely going to do well at PE temperatures, which are on average around 17-18C.

    You do get tropical species that have some cold tolerance. For example some tropical species like anthias, a few urchins and snails etc. are found right down to PE all year round. Their preferred temperatures are obviously higher though, and they're basically just surviving rather than thriving at lower temps.
     
  16. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,142
    Likes Received:
    1,228
    Location:
    Centurion
    That my friend. Is my question.

    Kosi Bay today is at Sea Temperature Today is: 27.3 °C

    So if 10 critters from Kosi are collected, plus 10 from Knysna.
    And all be put into the same tank at 25.
    Which group would be happy?

    How long will the other group take to adjust to the constant higher temperature? If ever?

    Will a quick 30 minute drip be enough to introduce the critter to his new constantly warmer home?
     
  17. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,142
    Likes Received:
    1,228
    Location:
    Centurion
    OK, what happens to a specimen that were collected at their lower tolerance. And then moved to a warmer tank?
     
  18. KeeganP

    KeeganP

    Joined:
    23 Jan 2008
    Posts:
    1,880
    Likes Received:
    53
    They were always on the glass and on rocks,
    Never seen them eat meat.
     
  19. Lord_Blackadder

    Lord_Blackadder

    Joined:
    10 Apr 2012
    Posts:
    1,642
    Likes Received:
    131
    Location:
    Durban
    They can adapt quite quickly. It's more long term average that is the issue. You get many species in the WC and EC that live in 30 degree rockpools for half their lives but still can't handle constantly high temperatures and aren't found in KZN.
     
  20. Lord_Blackadder

    Lord_Blackadder

    Joined:
    10 Apr 2012
    Posts:
    1,642
    Likes Received:
    131
    Location:
    Durban
    Shouldn't be any problem at all. Guys in the EC catch tropical fish in 16-17 degrees and put them into 26-27C with no issues. I'd probably give it a longer drip, but it's not like they need weeks or months to adapt.
     
  21. RiaanP

    RiaanP Thread Starter Moderator

    Joined:
    11 Aug 2008
    Posts:
    23,142
    Likes Received:
    1,228
    Location:
    Centurion
    Even if the same species is found in KZN. But its already older than a year. So its is used to be in colder water on the long term.

    Would a cushion star collected at Plettenberg Bay at 15.5°C be happy or able to adjust to our constant 25°C?
     
Recent Posts

Loading...
Similar Threads - Local species tolerance Forum Date
Thread idea: Quick idea of local species General Discussions and Advice 8 Dec 2010
local triggerfish species - juveniles Marine Fish Discussions 22 Feb 2010
What local caught butterflies can i try in a reef tank? Marine Fish Discussions 3 Nov 2016
lets see your local zoas Diving, Collecting and Environmental Discussions 9 Apr 2016
Local Live rock Diving, Collecting and Environmental Discussions 1 Apr 2016
Local black and yellow striped fish ID Needed 7 Mar 2016
Local to not Local fish and Coral General Discussions and Advice 12 Feb 2016