[Coral-List] Securing markers on permanent transects

Barbara Whitman terramar at caribcable.com
Tue Feb 24 14:32:11 EST 2009


I don't use metal in any part of my aquariums because it affects the 
invertebrates.  Wouldn't it also have an affect in the ocean?
Barb Whitman

----- Original Message ----- 
From: "Helen Sykes" <helenthereef at gmail.com>
To: "'Reshad'" <reshad1977 at gmail.com>; <Coral-List at coral.aoml.noaa.gov>
Sent: Monday, February 23, 2009 6:28 PM
Subject: Re: [Coral-List] Securing markers on permanent transects


> HI Rashad.
>
> I find steel bar markers diffcult to install, unsightly in tourism areas 
> and
> potentially dangerous on shallow reef flats.
>
> I cable tie fishing floats onto the reef substrate, and tag every 5 or 10
> metres along the transect with cable ties with the staight ends left
> sticking out.
>
> Over time these become covered with coralline algae and so less visible to
> the eye who is not looking for it, but are still obvious enough to the
> trained surveyor laying a line.  So far these have remained on the reefs 
> for
> over 8 years if carefully situated in none-brittle areas.
>
> Cattle tags work well too, and can be marked with marker pen.
>
> Helen
>
> Helen Sykes
>
> Director
>
> marine ecology
> Fiji's leading company for Coastal & Marine Ecology Assessments
>
> Fiji Coordinator
> GCRMN and Reef Check
>
> PO Box 2558, Govt Buildings
> Suva, Fiji Islands
> tel: +679-336-3625 / +679-359-2136
> e: helen at marineecologyfiji.com
> web: http://www.marineecologyfiji.com/
>
>
>
>
>
> -----Original Message-----
> From: coral-list-bounces at coral.aoml.noaa.gov
> [mailto:coral-list-bounces at coral.aoml.noaa.gov] On Behalf Of Reshad
> Sent: Monday, February 23, 2009 4:56 PM
> To: Coral-List at coral.aoml.noaa.gov
> Subject: [Coral-List] Securing markers on permanent transects
>
> Dear list,
>
>
>
> I have the responsibility of ensuring consistency of data collection in a
> Rodriguan coral reef monitoring programme, that has been under way since
> 2002.
> Essentially we survey reef flat and reef slope benthos, fish and
> invertebrates, by repeated measure of three permanent transects, at a 
> number
> of sites around the island.  We  are having problems keeping our permanent
> transect markers on several of the reef flat sites, due to the effect of
> hydrodynamic forces on both markers and substrate.  In the past several
> markers have been replaced each year, making our repeated measure of 
> benthos
> somewhat questionable.  This year it has been suggested we abandon these
> sites completely because of the problem.  I don't particularly agree with
> giving up that easily, and would like to know if anyone has found a more
> effective method, than we have, to mark reef transects.  We currently have
> metre long, 2 cm diameter steel T-bars, driven almost all the way into the
> reef structure, but we have also tried drilling into the substrate and
> fixing the steaks using concrete.  We mark our transects at 0, 5, 10, 15, 
> 20
> and 50 m.  Most eventually loosen then disappear, some after only six
> months.  Any information on progress in the field would be most welcome.
>
>
>
> Cheers,
>
> Reshad
>
>
>
>
>
> Reshad Jhangeer-Khan
>
> Science Co-ordinator
>
> Shoals Rodrigues
>
> Pointe Monier
>
> Rodrigues
>
> Mauritius
>
>
>
> Mobile:   +230 733 1769
>
> Office:     +230 831 1225
>
> Fax:         +230 831 0287
>
> Email:     research at shoals.intnet.mu
>
> Web:       http://www.shoalsrodrigues.net
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