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A demonstration
program for reef monitoring was conducted from 24 - 26 August
2004, on the island of GDh. Atoll Thinadhoo. More than 20 students
from GDh Atoll Education Centre which is one of the three schools
who are engaged in the Small Islands Voice on-ground activities
in the Maldives volunteered to participate in this program.
Field demonstration
was followed by a lecture session on the importance of coral reefs,
their management and on the survey methodology presented by Mr.
Hussein Zahir, of the Marine Research Center who also guided the
students through the field work. Even though most of the students
who participated in this program were students from environment
club of the school, there were other volunteered students and
teachers from the school as well.
As the reef
survey needs a long term monitoring mechanism targeted on given
time periods, the schools were presented with 5 sets of snorkeling
gears and with other accessories needed to continue the survey
by themselves. A field guide which helped the students on the
survey methodology and identifying the types of corals and fishes
was also presented.
Since the
field session was aimed demonstrate the students on how to do
the survey no real data was collected.
Resource
monitoring for management
Mr. Hussein Zahir
The
management of coastal resources such as reef resources can only
succeed if the local communities are well informed and agree.
In this regard there is need to educate and train local communities
in self assessment and use the outcome of these assessments for
self management, particularly to understand the benefits of good
management as well as the consequence of no action.
Most
communities may see that their resources are been steadily depleted
but often they do not understand the reasons. Governments do not
usually have the resources to enforce regulations effectively.
Therefore education and awareness raising of all stake holders
is the best mechanism to have self enforcement of management rules.
The best means to get good management of coral reefs and other
ecosystems is through education at all levels. The future users
and leaders of the resources can be informed in primary, secondary
and tertiary schools about the principles of ecosystems, good
management and threats to the system.
Such
an education program needs good teaching resources and teaching
guides that are applicable to the region. It should also be comparable
at all levels (local and national) so that trends and changes
can be measured and compared.
Introduction
of a tangible and measurable methodology for coral reef assessment
targeting the environmental clubs in the schools in the island
communities in the Maldives has been initiated as part of an environmental
awareness and capacity building effort. This is primarily to educate
and increase awareness among the school children, on the overall
state of their immediate environment, identify the causes for
the deterioration of the environment.
The
status of the resource can be measured by surveying that is gathering
data or information about the resources in the ecosystem once
which may include measure of many things. A survey can give data
and information on the status of the health of a system (e.g.
bleached or healthy corals) and how the resources have been used
(e.g. fish, sea cucumber, lobster).
With
repeated monitoring information on the changes to the resources
can be readily available. This would be particularly useful if
surveys are repeated using the same methodology. Monitoring shall
be repeated usually for several years at least to be useful, because
some things can change naturally between seasons or years (e.g.
growth of some species of algae). It is essential to monitor important
components of the reef that are needed for resource management
(e.g. commercial fish species, live coral cover). Otherwise monitoring
may take too long and be too expensive. Monitoring will tell of
changes or trends that happen in the reef system as indication
of overuse or damage. This information can also be used to take
some management action to curb the problems and the successfulness
of these actions can also be measured over time, through monitoring.
Methodology
The methodology adopted for this community (school environmental
clubs) level monitoring program is the Reefcheck coral reef monitoring
protocol (www.reefcheck.org) which has been specifically designed
to provide scientifically robust information on the status of
the reefs, and at the same time be easy and practical to carry
out by people who have limited knowledge on the biology and ecology
of the reefs.
In
principle an observer swims with a snorkel and mask along a transect
line and records the benthic category that is directly below the
transect line
Two
specific methods are been adapted for the reef monitoring program.
- Point
Intercept Transect (PIT) methodology for monitoring benthic
community
- Fish belt
transect for assessing the reef fish community
Point
Intercept Transect (PIT)
Information
obtained
Percent cover of the benthic communities monitored can be easily
obtained using specially designed Excel spread sheets. In addition
to the percentage cover of the various benthic groups (e.g. hard
coral) basic statistics for different groups can be also calculated.
Equipment
required
Mask, snorkel and fins
Tape measure (2x 50meters)
Plum line (small metal object tied to 1 meter string)
General
procedure
Lay the 100 meter transect using the measuring tapes on the reef
edge/ reef flat area along the depth contour. The observer then
swims along the transect and records the substrate or benthos
directly below the line. The plum line removes the bias and parallax
error. The plum line is used to determine the benthos directly
below the line at each 0.5 meter interval. Four 20 meter segments
of the 100 meter transect line are used for recording the benthic
group below the every 0.5m. A total of 160 points (40x 4) the
main groups of reef organisms and substrate recorded using PIT
are;
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HC
SC
RKC
NIA
SP
RC
RB
SD
SI
OT
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Hard coral (all types of living hard coral)
Soft coral (all types of living soft coral)
Recently killed coral (all types)
Nutrient indicator algae (fleshy and filamentous algae)
Sponge
Coral rock (solid hard substrate of reef)
Rubble (medium to small pieces of rock easily movable)
Sand
Silt/ clay (if disturbed does not settle to bottom immediately)
Others (other organism, specify if common) |
Fish
belt transect
Information
obtained
Abundance of key target fishes
Equipment
required
Transect tape (100 meters)
PVC pole to estimate the belt width (optional)
General
procedures:
Lay out the 100 meter transect tape at the same depth contour
and the location for monitoring benthic community (same transect
line is used for both surveys). Wait for 15 minutes after the
transect laying to start and continue the fish survey because
the fish are disturbed during the transect layout. The census
area for the fish survey is also 4 x 20 meter segments which are
5 meters wide (2.5 meters either side of the transect line). The
observer counts and records the number of target species in each
segment. The target species can be specified and agreed for the
specific region and same species or groups are monitored repeatedly
over time. The main groups of fishes that are recorded are given
below.
Butterfly
fishes
Sweetlips
Snappers
Groupers
Parrot fishes
Surgeon fishes
Additional
information
In addition to these surveys general information about the site,
such as fishing patterns, source of pollution, population of the
island, number of fishermen, coastal development activities can
be important to link to the trends that may emerge through long
term monitoring.
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