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| How to Do a DockWatch |
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Go Here to see how to do some of the tests Part
1: Dock Walk
(if you do not have access to a dock, do Steps 1-3
on "Beach Walk") Step
1 of 3: v
Walk the dock looking
for conspicuous jellies. v
Make note of what
species you see, as listed in the Jellyfish Key. v
For each species, note a
size range: Marble
(1/2 in), golf ball (1in), baseball (3 in), softball (5 in), bowling
ball (12 in), 'really big' (>12 in.) v
For each species,
estimate abundance: Just
1, a few, 10's, 100's, or 1000's v
Tip:
Look at the water from the dock's edge out to the horizon, as far
as you can see.
Step
2 of 3: v
Looking close to the
dock, focus on discovering smaller jellies, such as ctenophores,
Hydromedusae, and smaller individuals of the bigger ones you've already
recorded. v
Again, record size and
abundance estimates.
Step
3 of 3: v
To observe very small
specimens, scoop dip net through water for 15 seconds. v
Empty contents into
bucket with water and examine. v
Note species, sizes, and
abundances. v
Do this 3 times off
different parts of the dock. v
Tip: If you cannot identify a jellyfish, take a picture and/or
detailed notes on its color, markings, lappets, oral arms, size, and any
other potentially identifying markings. Call DockWatch as soon as
possible with this information (334-861-7565 or dockwatch@disl.org). Submit
these as "unknown" on the web site and provide the submission
reference number with pictures or descriptions. If you
take digital pictures, you can attach them to your e-mail. If you take
regular pictures, please mail them to us as soon as possible: DockWatch/
Dr. Graham, Dauphin Island Sea Lab, 101 Bienville Blvd., Dauphin Island,
AL 36528. Part
2: Physical Data v
Temperature:
Use bucket to scoop some water, then partially immerse the thermometer
(about 1/3) into the water; allow it to stabilize for 45 seconds, then
record temperature on data sheet. Also allow thermometer to stabilize to
air temperature for 45 seconds and record. v
Salinity:
Use provided test kit and water from bucket as for temperature NOTE:
The chemical are toxic. Be sure to wear the provided eye goggles when
performing this task. Keep out of reach of children. Store in a cool,
dark place, but NOT your refrigerator or anywhere near where you store
food. v
Place blue tip on
syringe and draw-in full syringe (1-ml) of water from bucket. v
Dispense into plastic
vial. v
Add 1 drop of Reagent
1, close vial cap and gently mix (shake back and forth, but
do not turn upside-down to avoid spilling). Sample will turn violet. v
While swirling the
sample, carefully add Reagent 2 one
drop at a time until the sample turns yellow (may only take a
few drops). Replace cap on vial. v
Remove blue tip from
syringe and replace with red tip. It is very important to not use the
same tip for the water and Reagent 3. v
Push plunger completely
into syringe, insert tip into Reagent 3, and completely fill syringe (to
0-ml mark). v
Place syringe tip into
plastic vial but not down into the yellow solution. Slowly add Reagent 3 one drop at a time,
swirling solution between each drop until it turns violet (solution may
turn violet for a second, then return to yellow; continue adding 1 drop
at a time until it stays violet). v
Once solution stays
violet, read and record the syringe marking (0.X-ml), then multiply by
40 to obtain salinity in ppt (parts per thousand). Record salinity on
data sheet. See
Instruction Manual inside kit for additional information. v
Water
Clarity: Use the transparency tube to
determine how clear the water is.
For instruction on how to use the Transparency Tube please see the Videos
page v
Be sure the clamp is
closed on the outflow tubing at bottom. v
Scoop water with the
bucket and pour it into the tube. (Tip:
The tube only holds a little over 1 ˝ gallons, so you don't have to
fill the bucket very full.) v
If you cannot see the
secchi pattern (white and black triangles at bottom of tube) through the
water, gently press on the clamp with your foot to drain the water. v
Allow the water to drain
until the disk just becomes visible. Close the clamp again by gently
pressing on it with your foot. v
Read the tape measure at
the water level still in the tube. Record this number (in centimeters) on data
sheet. v
If you can see the
secchi pattern when the tube is full to the 120 cm mark, record the
clarity as >/= 120 cm ("greater than or equal to" 120 cm) v
Tips: Practice using the transparency tube several times away from
the dock, as it is very easy to drop the tube in the water. It is not
easy for us to make a new one. Please let us know immediately if your
tube does get “lost to the Gulf” or if it begins to come apart (i.e.
leak or the tape measure comes off). v
If your dock is equipped with a hose that pumps seawater from
near your dock, you can use it to fill the transparency tube. v
If you are using the bucket to fill the tube, try picking the
bucket up by the rim with one hand and holding the tube with the other,
or try holding the tube between your knees or feet if using two hands on
the bucket. Remember, you only need 1 ˝ gallons, not the whole
bucket-full. Please practice this technique before attempting it at the
dock! If there is someone who could accompany you to help you with this,
it would be much easier for you. v
Water
surface: make
a judgement as to the appearance of the water's surface: calm (no to
little ripples), light chop (small ripples to small wavelets), choppy
(rough wavelets, some with white tips), rough (larger wavelets, most
with white tips). Record on data sheet. v
Wind:
make a judgement as to how hard the wind is blowing and from which
direction. Remember, wind will effect water surface. No wind (calm
water), light breeze (light chop), brisk (windy enough to blow your hair
around; choppy), high winds (difficult to perform Dock Watch duties;
rough water). Record on data sheet. v
Weather:
sunny, cloudy (individual clouds), overcast (solid gray sky), raining,
storming. On data sheet, can indicate more than one, i.e. cloudy and
raining. v
Cloud
cover: estimate the percentage of
cloud cover and what type of clouds are present (see Dock Watch web site
for cloud chart). Record data.
Part 3: Beach Walk v
Walk along water's edge
for 5 minutes and back (10 minutes total). Make note of beached
jellyfish and other observations of jellyfish in the water. Also record
which direction you start walking (roughly: north, east, south, west). If
you do not have access to a dock, perform all "Dock Walk"
duties during your "Beach Walk". NOTE:
Be sure to record the date and time of all your Dock Watches! Enter all
data onto the online form, but keep the hard copy (paper copy) and we
will collect it. Be sure to include any unusual observations in the
comments section on the web form.
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