Sifting fine sand for benthic invertebrates (Sampling method images)

The method above works best where the majority of the sand is finer than the holes in the sieve and where the fauna being looked for is larger. It is always best to wash the sieve after each sample taken. Below examples of types of fauna found on the day the above images were taken.

Marine sampling
Sifting fine sand
- Pontocrates arenarius, an amphipod 1

Marine sampling
Sifting fine sand
- Bodotria scorpioides, a cumacean 1

Marine sampling
Sifting fine sand
- Cumopsis?, a cumacean 1

Marine sampling
Sifting fine sand
- Mangelia costata, a gastropod mollusc 1

Marine sampling
Sifting fine sand
- Donax vittatus, Banded Wedge Shell 1

Marine sampling
Sifting fine sand
- Pseudomystides limbata, a polychaete worm 1

Marine sampling
Sifting fine sand
- Eumida species, a polychaete worm 1

Marine sampling
Sifting fine sand
- a nemertean / ribbon worm 1

Marine sampling
Sifting fine sand
- Echiichthys vipera, Lesser Weever 1

Images above were taken at Albert Pier reef, Penzance Harbour, Penzance, Cornwall, and at the authors home.

Notes for above.

1. The first thing is to deciding where to sample, e.g. in a gulley filled with sand, as both sediment loving and reef loving species could be present.
2. Equipment, plastic kitchen sieve, containers and bucket/s. Plastic kitch sieves are usually available in most supermarkets for about a pound.
3. Method
Sand is collected in the sieve by pulling it towards the body with both hands. Sieve is agitated to remove fine debris and sediment and until clean sand and debris is left behind. The sieve is then inverted over a container of seawater and bottom of sieve poked into the seawater to remove contents. Process may be repeated several times depending on amount of sediment collected by the sieve. The lid is put on the container and fixed either side of a corner, the container is then submerged in seawater with open corner uppermost to completely fill container with seawater, this prevents sloshing during transit and damage to organisms. The container is then placed in a bucket of freshly collected seawater to keep samples cool, this is especially important on warm days.
4. Numerous containers can be filled from different parts of the shore or changes in habitat / seawater depth.
5. Before returning, containers are stacked inside a larger container, which is filled with fresh seawater and clipped shut / sealed, and to keep smaller containers cool in transit.
6. On getting home containers are opened and placed in fridge.
7. Containers are looked at using a stereomicroscope.
8. Worms etc. selected by pipette, cleaned and photographed.
9. Samples returned to the fridge and then to shore the following day or day after. The only exception is with non-native species, which are not returned to the shore.
10. Then starts the process of identification and biological recording.

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APHOTOMARINE

An online educational resource dedicated to the photography of
marine themes, marinelife, life on the seashore and in rockpools
in the coastal waters of south-West England by David Fenwick.

APHOTOMARINE

An online educational resource dedicated to the photography of marine themes, marinelife, life on the seashore and in rockpools in the coastal waters of south-West England by David Fenwick.

An online educational resource dedicated to the photography of
marine themes, marinelife, life on the seashore and in rockpools
in the coastal waters of south-West England by David Fenwick.