[Coral-List] Questions - Measuring Acropora

Sebastian Striewski sebastian.striewski at rub.de
Thu May 28 12:26:39 EDT 2009

Dear V. Pizarro,

an easy way to calculate a planar area might be done with a modified 
point intersept transect taking pictures and analysing them using the 
software CPCe from Kohler et al 2006,     
http://www.nova.edu/ocean/cpce/   using thefunction "planar area analysis".
This very helpfull software allows to calibrate images taken during a 
transect and analysing areas computer based.
We used this method in the Red Sea just recently. A simple plastic 1m2 
frame was positioned along a linetransect every 5meter and detailed 
pictures taken from the area underlying the frame. Back in the 
laboratory those pictures were than easily analysed with the mentioned 
software and data exported towards Excel from Windows.
Besides very good to hear from recovering Acropora palmata!

Greetings, Striewski

Valeria Pizarro schrieb:
> Dear coral-listers,My colleagues and I are starting a project on Acropora palmata and A. cervicornis in the Caribbean coast of Colombia. We are sampling the area of the Tayrona National Marine Park. We are mapping the location of the Acropora spp patches, measuring these areas and finding the abundance within each area. With the latest we had had problems because it has been hard to tell apart one colony from another, especially when the colonies are big or patches dense. The other problem is to set the transects without damaging any of the colonies.I anyone can help us with an easy method to measure Acroporids abundance we will be more than grateful.The good news are that apparently at least for this area we are sampling Acropora palmata seems to be recovering. One can see juvenile colonies growing over dead Acropora colonies.thanks,Valeria
> ________________________________________Valeria PizarroAssociate LecturerMarine Biology ProgramUniversidad Jorge Tadeo LozanoSanta Marta, Colombia
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