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d.abdo

Member Since 04 Sep 2006
Offline Last Active Nov 06 2006 02:54 PM
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Posts I've Made

In Topic: Motivation

11 September 2006 - 09:07 PM

simplest questions are often the best!

I take pics underwater for a number of reasons. I do it becasue I enjoy it. I love capturing a beautiful scene or a weird and wonderful critter. I suppose there is also the allure of being able to sell an image. I like being able to show off my images to friends and family, and most importantly capture memories for when I cant dive anymore!
I like others also have the pleasure of using photography for my work. I am finishing off my PhD on sponges and use photography for my research.

So ther are personal and professional reasons for my need/want to take photos underwater.

Cheers Dave

West Oz
Australia

In Topic: Coral Age by species

07 September 2006 - 05:26 PM

hey chris,

you can age corals from their size, but the accuracy would not be there - unless you start taking cores of the coral (examine the layering of their skeleton and chemical make up). Many corals grow at known rates (plenty of scientific literature out there detailing coral growth rates). However, a word of warning - many of the growth rates are site/species specific - as many biological (predation, competion etc) and physical (water temperaure, light avaliability, sediment load etc) factors can influence the growth of corals. You could make a rough judgement - but it would be rough. Hope this helps. You could try contact a research group in the area you are interetsed in - as they would probably be able to point you in the right direction - of either papers or actual data.

Cheers Dave

In Topic: Charter and introductions!

07 September 2006 - 05:05 PM

Hi Everyone,

Dave here. I use photography in a variety of ways for my work/studies. I am currently in the last few months of my PhD studies. I am research the poulation dynamics of two marine sponges (one of which produces a potent antiumor compound in pre-clinical trials). I use photography to document changes in the sponges I study from monitoring their health, to determining if any asexual reproduction is occuring. I also document the little critters which utlise the sponges as habitats - you would be amazed with the divesity of fauna (and reproducing too!). The most advanced use of photgraphy in my work is to determine the volume of the sponges i study - to monitor their natural growth patterns (to do accurately - use to have to remove the animal from the substarte or use unaccurate ruler method(lxwxh)). I do this by using a stereo camera system (made up of two canon 30D's and video lights) (developed by my supervisor and me) to take stereo image pairs around the target sponge. Then using these image sets and a software program developed by a college of mine - the volume can be accurately and precisely determined. I have a paper published on the work if anyone is interested.
I also use photgraphy in the lab when examining the histological samples (for studying the sponge reproduction) and during taxonomic work on the sponges (looking at their spicules and skeletons).

I have also used video and digital stills for habitat mapping and surevys of fauna in my previous employment. I look forward to contributing to this forum, sorry about blabbing - but thought you might be interested. If anyone wants more info on what I do or just wnats a chat dont hesitate to ask.

Cheers Dave

West Oz
Australia

In Topic: Canon 20D going under

06 September 2006 - 06:01 PM

thanks everyone for your replies. Great to hear from users of the gear.

Cheers Dave

West Oz
Australia

In Topic: Introductions (original thread, now closed)

04 September 2006 - 11:54 PM

Attached File  dabdo.jpg   256.13KB   212 downloadsHey everyone,

Dave here. Finally joined wetpixel. I have been diving since 1994 and it has now become my life. I am a Marine Ecologist - currently back at school working on my PhD. I am studying the population dynamics of two marine sponges. I have been a keen underwater photgrapher since i could afford it (about 1998). Moving from a nikonos V, to a C5050/ikelite system - to my up and coming Canon 20D/ikelite system. I have dived various places, but most happens in my local waters (the south west of Western Australia). Anyway, love the site.

Cheers Dave

West Oz
Australia