[Coral-List] pocillopora damicornis settlement rates
OA - JArcher
jarcher at oceanadventure.com.ph
Mon Jan 12 02:06:08 EST 2004
Try to minimise light, especially red spectrum stuff. Maybe keep it in the dark. Diatoms will still settle and the biofilm will still develop, hopefully in the absence of green algae.
----- Original Message -----
From: Wendy Chen
To: jarcher at oceanadventure.com.ph
Sent: Monday, January 12, 2004 2:29 PM
Subject: Re: [Coral-List] pocillopora damicornis settlement rates
Thanks for the insight. I tried to leave my glassware to soak in seawater longer, but I was getting a lot of green seaweed growing on it. It was very difficult trying to take that out without taking the biofilm at all. When I left the seaweed in, the larve died within a half a day even in the control that only had filter seawater. I think that my problem may be that there is no water movement in the glass containers. I need to find a way to create some type of movement, no matter how minimal. I will try that out next week. Thanks again.
aka Woon Jaye Chen
>From: "OA - JArcher"
>Reply-To: "OA - JArcher"
>To: "Wendy Chen"
>Subject: Re: [Coral-List] pocillopora damicornis settlement rates
>Date: Mon, 12 Jan 2004 12:39:13 +0800
>I don't have a lot of experience, but I find that if you age the settlement
>plates a little more than a few days, then the consistancy of results
>improves - to a certain extent, and with limitations. I feel that the
>problem may lie in the initial competition/succession rates of the pioneer
>species, with patchy cover of biofilm due to competition and growth rates of
>any of the multiple species of bacteria that colonise. I find that if we
>leave plates longer, then we get a good cover of bacteria and a usually a
>stable cover of diatoms on top of that. This also provides good food for our
>own needs in terms of culturing corals, echinoderm and holothurian larve.
>It also depends on the nature of the substrate you are using. New Cement or
>firbous plates contains leachates which are found in varying concentrations
>around the surface which may have an inhibitory effect on subsequent
>colonisation and growth.
>Director of Aquatics and Marine Operations
>West Ilanin Forest Area
>Subic Bay Freeport Zone
>Phone: +63 47 252 9000 ext 223
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>Email: jarcher at oceanadventure.com.ph
>Dive Enquiries: dive at oceanadventure.com.ph
>----- Original Message -----
>From: "Wendy Chen"
>Sent: Tuesday, January 06, 2004 10:40 AM
>Subject: [Coral-List] pocillopora damicornis settlement rates
> > Hi! I'm a grad student in Guam working on toxicity studies with
> > pocillopora damicornis larvae. I'm having some trouble with my
> > controls. I'm settling out larvae in glassware with biofilm on it. The
> > glassware was conditioned by placing it in flowing seawater from 2-4
> > days to allow the biofilm to develop. My problem is that sometimes I
> > get very high rates of settlement from 70-100% and then other months,
> > I get 3-15% settlement. All the experiments are run exactly the same,
> > but yet I get a lot of variability. So I was wondering if anyone else
> > has some experience with dealing with pocillopora damicornis
> > settlement or if you can direct me to some references. I only have a
> > Hodgson paper from 1972 and a more recent one from Taiwan. Any help
> > would be greatly appreciated. Thanks.
> > Wendy Chen
> > aka Woon Jaye Chen
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