If you cross oceans and wish to help GOES help the environment by collecting plankton samples, then it is easy for you to engage. If you have a plankton net, we will free issue you with sample containers for you to send the samples back to Goes Foundation.
If you do not have a plankton net, then we can provide you with a plankton net at cost price. If you return the plankton net after use in good condition, 50% of the cost will be refunded.
One common method for collecting a plankton sample is to tow the net horizontally using a low-speed boat. Before collecting the plankton, the net should be rinsed with the sample water. The user should ensure that the cod end is completely closed by turning the valve into a vertical position. Then the plankton net is then lowered horizontal to the water surface at the side of the slowly moving boat. Sampling is done for 1.5 minutes. After this time, the plankton sample is collected in a sample bottle by opening the cod end above it by turning the valve horizontally.
When the sample is collected it can be analysed using a microscope to identify the type of zooplankton or phytoplankton, or a cell count can be undertaken to determine the plankton cell density of the water source.
The second recorded use of a plankton net was by Charles Darwin on 10 January 1832, during the Beagle survey voyage. His diary included a sketch of the net, which appears to have been based on a trawl net described by John Coldstream in a letter to Darwin. It is possible that Thompson's idea had earlier been drawn to Darwin's attention by Robert Edmond Grant in Edinburgh. Darwin describes this "contrivance" as "a bag four feet deep, made of bunting, & attached to [a] semicircular bow this by lines is kept upright, & dragged behind the vessel".
The next day he remarked that "The number of animals that the net collects is very great & fully explains the manner so many animals of a large size live so far from land. — Many of these creatures so low in the scale of nature are most exquisite in their forms & rich colours. — It creates a feeling of wonder that so much beauty should be apparently created for such little purpose.
The consequences and effects of priority chemicals has been almost completely ignored, yet it will result in a cascade failure of the entire marine ecosystems in next 25 to 40 years unless we take action now. Failure to take action will result in a loss of most of our marine mammals and birds as well as teleost fish and a food supply for 2 billion people.
Copepods are marine zooplankton that are used as indicator species to determine the health and status of the marine ecosystem. At Goes Foundation we are taking it one stage further by chemical analysis of the organisms for priority chemicals, the information will be used to raise awareness and hopefully effect change.
1 x plankton net
20 x 50ml sample vials (certified for metal analysis)
20 x disposable wooden spatulas
Plankton samples should be taken approximately 4 hours after sunset at night, the GPS position, date and time are recorded and written on the sample container label. If the vessel is equipment with a digital microscope, then a photographic record of the sample at 50 x magnification would also be useful. A series of up to 10 to 20 samples should be taken (if possible) on one ocean passage.
The metal analysis will relate to the following;
TOC total organic carbon
silica, total silica
tin, mercury, lead, copper, iron
nickle, zinc, cadmium, arsenic, chromium, uranium
Sample collection is fairly simple, just trawl the net behind the yacht for a period of about 60 minutes, or for as long as it takes to collect at least 10ml of plankton. The yacht will need to be travelling at under 2 knots during the trawl. Once the sample has been taken, remove the net from the water, allow the net to drain, and for the sample of the plankton to collect in the end cap. Once the net has drained, carefully decant the contents to the sample vial. Avoid touching the sample as this could transfer contamination from your hands. The wooden spatula provided with the kit may be used to help transfer the contents to the sample vial. Try to minimise the amount of water collected. Seal the tube firmly, the sample may now be stored for many weeks, however best to keep out of direct sunlight and if possible store in a cool dark place such as a fridge. The samples will not degrade because we are measuring metals, however way may conduct additional tests such as PCBs and PBDE on good samples.
Label the sample with the following information
- yacht name
- gps position
- length of plankton trawl (minutes)
- number of hours after sunset
- Type of anti-fouling paint used if known, eg is it copper based, TBT or other, please state.
- If possible email a photograph of the sample, and include the date and time in order for it to be matched to the sample.
The concentration of transition metals and heavy metals are much higher in the oceans that can be explained by the emissions from hydro-thermal vents, or air blown inoculation. Plastic also breaks down to nanoparticles and will sequester heavy metals as other priority chemicals. Below 20nm in size the particles can pass through cell walls, copepods and zooplankton then eat the algae and the toxins end up in the zooplankton. Very few research vessels have measured the pollutants, this is what makes it so important for plankton sampling and citizen science that is possible onboard yachts.
The sample containers are unfortunately in plastic, we tried to obtain glass vials with cork top, but they could not be certified meal free.
This sample vials comply with the following methods metal analysis.
|EPA 200.2||EPA 200.5||EPA 200.7|
|EPA 200.8||EPA 200.9||EPA 245.1|
|EPA 245.7||SM 3030||SM 3112|
|SM 3120||SM 3125||ISO 15202-2:2012|
|ISO 15587-1:2002||ISO 15587-2:2002||EPA 3050B|
Analysis is by ICP Atomic Emission Spectroscope, paper covering analytical principles . click here